# Which blood pressure matters: measurement and prognosis

*Part of the [Maintenance Hemodialysis](https://urinenephrology.org/mastery/maintenance-hd/index.html) mastery module. Reviewed September 2026.*

## Bottom line

- **Hypertension is the rule, not the exception.** It affects 80–90% of patients on maintenance hemodialysis and is driven primarily by sodium and volume excess, with vascular stiffening and neurohumoral activation layered on top ^([1](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-1),[2](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-2),[3](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-3),[4](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-4)).
- **Measure outside the unit.** The 44-hour interdialytic ambulatory recording (ABPM) is the reference standard; home BP over 6–7 days is the practical management metric; averaged intradialytic BP is the acceptable fallback. A home systolic of 141 mmHg identified ambulatory hypertension with 86% sensitivity and 93% specificity ^([5](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-5),[6](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-6)).
- **Peridialytic readings are poor treatment targets.** In a head-to-head comparison, neither pre-dialysis (P = 0.17) nor post-dialysis systolic BP (P = 0.997) predicted mortality once home and ambulatory BP were measured, while home and ambulatory BP did ^([7](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-7)). The pre-dialysis cuff misclassifies about one patient in three ^([2](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-2)).
- **They are not prognostically silent.** Low in-center readings mark risk ^([8](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-8),[9](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-9),[10](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-10)). The accurate summary: in-center BP is a poor target for chronic treatment and a real signal for the safety of today’s session.
- **A high pre-dialysis BP licenses weeks of dry-weight probing, not a hard pull today.** In the DRIP trial, approximately 1 kg of additional dry-weight reduction brought approximately 7 mmHg lower ambulatory systolic BP by 4 weeks ^([11](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-11)). Within a session, the ultrafiltration rate, not the starting pressure, is what tracks with injury ^([12](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-12),[13](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-13),[14](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-14)).

## 1. How common, and how defined

Hypertension prevalence in maintenance hemodialysis runs 80–90%, depending on the metric used ^([1](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-1),[15](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-15)). The best single snapshot comes from 48-hour ambulatory monitoring in 396 European patients: 84.3% were hypertensive, and 46.0% were uncontrolled by *both* in-unit and ambulatory criteria. About one patient in three was misclassified by the pre-dialysis cuff — 18.2% had white-coat hypertension and 14.1% had masked hypertension ^([2](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-2)) (observational cohort).

The definitions that carry evidence differ by where and when the reading is taken. The thresholds for the out-of-unit methods are lower than the in-unit ones, and the evidence behind them is stronger:

| Metric | Hypertension threshold | Evidence status |
|----|----|----|
| 44-h interdialytic ABPM | ≥130/80 mmHg | Reference standard ^([3](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-3),[6](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-6),[16](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-16)) |
| Home BP, ≥6 days, duplicate morning and evening readings | ≥135/85 mmHg | Validated against ABPM ^([3](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-3),[5](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-5),[17](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-17)) |
| Averaged intradialytic BP | Approximates ABPM | Much tighter agreement with ABPM than peridialytic BP; acceptable ^([6](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-6)) |
| Scheduled interdialytic (off-day 8 am / 8 pm) | Approximates ABPM | Best accuracy of the in-unit alternatives (AUC 0.917) ^([6](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-6)) |
| Routine pre-dialysis BP | ≥140/90 (KDOQI 2005) | Poor agreement; grade C, opinion-based; not reaffirmed in the 2015 KDOQI update ^([18](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-18),[19](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-19)) |
| Routine post-dialysis BP | ≥130/80 (KDOQI 2005) | Least reproducible metric ^([6](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-6),[7](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-7),[17](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-17),[20](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-20)) |

A note on the KDOQI numbers, because they still anchor many unit protocols. The 2005 targets were graded C: opinion-based and extrapolated from the general population ^([18](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-18)). The 2015 KDOQI hemodialysis adequacy update addressed volume and BP control through treatment time, sodium restriction, and ultrafiltration rate but set **no numeric BP target**. The 2005 numbers were not formally rescinded; they were simply not reaffirmed ^([19](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-19)).

Two related definitions matter for the rest of this module:

- **Intradialytic hypotension (IDH)** has no consensus definition. Three definitional families exist — nadir-based, delta-based, and intervention- or symptom-based — and they do not identify the same patients ^([21](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-21)).
- **Intradialytic hypertension (IDHTN)** is most workably defined, following KDIGO 2020, as a pre-to-post systolic rise of more than 10 mmHg into the hypertensive range in at least 4 of 6 consecutive sessions, which excludes sporadic events ^([22](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-22)). See [Intradialytic hypertension and the stability trade-off](https://urinenephrology.org/mastery/maintenance-hd/intradialytic-hypertension.html).

## 2. Why blood pressure is high in kidney failure

The dominant mechanism is sodium and volume excess with a lagged pressure response, layered on vascular stiffening and neurohumoral activation ^([1](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-1),[3](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-3)). That ordering is clinically useful because it sets the treatment hierarchy: volume first, dialysis prescription second, drugs third ^([22](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-22),[23](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-23)).

Figure 1 lays out the chain. Loss of kidney sodium excretion leads to interdialytic sodium and water accumulation and extracellular volume expansion. Expansion raises cardiac output and defeats pressure natriuresis; over days to weeks, arteriolar autoregulation then raises peripheral resistance as well. Around that core sit sympathetic overactivity from the failing kidney, renin–angiotensin activation (often paradoxical at low volume), endothelin-1 release with reduced nitric oxide, arterial stiffening, and treatment-related contributors such as erythropoiesis-stimulating agents, high-calcium dialysate, and intradialytic sodium gain. The downstream consequences are left ventricular hypertrophy, diastolic dysfunction, and cardiovascular events.

    flowchart TB
        A["Loss of kidney sodium excretion"] --> B["Interdialytic sodium and water accumulation"]
        B --> C["Extracellular volume expansion"]
        C --> D["Increased cardiac output and<br>pressure-natriuresis failure"]
        D --> E["Sustained elevation of<br>interdialytic blood pressure"]
        C --> F["Arteriolar autoregulation<br>raises peripheral resistance<br>over days to weeks"]
        F --> E
        G["Sympathetic overactivity<br>from the failing kidney"] --> E
        H["Renin-angiotensin activation,<br>often paradoxical at low volume"] --> E
        I["Endothelin-1 release,<br>reduced nitric oxide bioavailability"] --> E
        J["Arterial stiffening, vascular calcification,<br>widened pulse pressure"] --> E
        K["Erythropoiesis-stimulating agents,<br>high-calcium dialysate,<br>intradialytic sodium gain"] --> E
        G ~~~ H ~~~ I ~~~ J ~~~ K
        E --> L["Left ventricular hypertrophy,<br>diastolic dysfunction,<br>cardiovascular events"]
        style A fill:#fff3bf,stroke:#f59f00,color:#000
        style B fill:#ffe8cc,stroke:#e8590c,color:#000
        style C fill:#ffc9c9,stroke:#e03131,color:#000
        style D fill:#ffc9c9,stroke:#e03131,color:#000
        style F fill:#ffc9c9,stroke:#e03131,color:#000
        style G fill:#d0ebff,stroke:#1971c2,color:#000
        style H fill:#d0ebff,stroke:#1971c2,color:#000
        style I fill:#d0ebff,stroke:#1971c2,color:#000
        style J fill:#d0ebff,stroke:#1971c2,color:#000
        style K fill:#d0ebff,stroke:#1971c2,color:#000
        style E fill:#ffa8a8,stroke:#c92a2a,color:#000
        style L fill:#ff6b6b,stroke:#c92a2a,color:#fff

**Figure 1. Drivers of Hypertension in the Hemodialysis Patient.** Sodium and volume excess is the core driver; the autoregulatory limb (arteriolar resistance rising over days to weeks) explains why blood pressure lags behind a change in dry weight. Adapted from the canonical review; the five amplifying drivers are stacked for legibility.

Clinical Pearl — the lag

The autoregulatory limb is the “lag phenomenon”: blood pressure falls over *weeks* after dry weight is corrected, not on the next treatment. How long the lag runs is debated. In DRIP’s prevalent hypertensive patients the ambulatory fall was already present at 4 weeks and did not deepen by 8, and the investigators found no support for a longer lag ^([11](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-11)). Either way, judging a probing maneuver by the next session’s pre-dialysis reading will make it look like a failure — pre-dialysis systolic BP was the least sensitive detector of the DRIP response ^([17](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-17)).

## 3. The peridialytic reading is not a blood pressure

### 3.1 The clock

On a thrice-weekly schedule the patient spends two short interdialytic intervals of approximately 44 hours and one long interval of approximately 68 hours off the machine each week. The standard “44-hour ABPM” records the mid-week short interval ^([6](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-6)). The long interval is when deaths and cardiovascular admissions cluster ^([24](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-24)).

Against that clock, consider what the routine readings actually capture. The pre-dialysis value sits at the peak of a 44–68 hour volume cycle, in a patient who may be anxious about cannulation, frequently after a deliberately withheld antihypertensive dose, taken by a machine cuff without standardization. The post-dialysis value sits at the trough of an acute volume contraction, taken minutes after the session and before vascular refilling completes. Neither is a resting, representative pressure.

### 3.2 How far off, and how often

The consequences are documented, not theoretical:

- In a meta-analysis of paired recordings, pre-dialysis systolic BP overestimated ambulatory systolic BP with limits of agreement of +41.7 to −25.2 mmHg; post-dialysis systolic BP underestimated it with limits of +33.1 to −36.3 mmHg ^([25](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-25)).
- In 242 patients compared against 44-hour ABPM, no in-unit metric showed systematic bias on Bland–Altman analysis, but pre- and post-dialysis BP had much wider limits of agreement. Pre-dialysis systolic BP detected ambulatory hypertension with 86.5% sensitivity but only 38.6% specificity ^([6](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-6)).
- Test–retest reliability runs home \> ambulatory \>\> pre-dialysis \> post-dialysis ^([17](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-17)).
- Out-of-unit BP is the superior determinant of left ventricular hypertrophy ^([26](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-26)).
- Home BP carries prognostic information that dialysis-unit recordings do not ^([27](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-27)); post-dialytic BP remains, in the current literature, “an inaccurate metric” ^([20](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-20)).

The same diagnostic-accuracy study ^([6](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-6)) ranks the in-unit alternatives directly. Only the pre-dialysis reading performs poorly:

| In-unit metric (vs 44-h ABPM) | Area under the curve for ambulatory hypertension | Comment |
|----|----|----|
| Routine pre-dialysis systolic BP | 0.723 | Sensitive (86.5%) but not specific (38.6%): it labels many normotensive patients hypertensive |
| Averaged intradialytic systolic BP | 0.850 | Uses readings already collected at every session |
| Scheduled interdialytic systolic BP (off-day 8 am / 8 pm) | 0.917 | Best of the in-unit options |

    flowchart LR
        Q["What is this BP measurement<br>actually telling you?"] --> A["44-hour interdialytic ABPM<br>Reference standard<br>Predicts mortality and LVH"]
        Q --> B["Home BP, 6-7 days<br>Threshold 135/85 or SBP 141<br>Predicts mortality"]
        Q --> C["Averaged intradialytic BP<br>Agrees with 44-h ABPM<br>Acceptable surrogate"]
        Q --> D["Routine pre-dialysis BP<br>Peak of the volume cycle<br>Cannulation anxiety, held meds"]
        Q --> E["Routine post-dialysis BP<br>Trough of acute contraction<br>Least reproducible metric"]
        A --> V1["Valid target for treatment"]
        B --> V1
        C --> V2["Acceptable second-line surrogate"]
        D --> V3["Mortality association U-shaped<br>Not significant vs out-of-unit BP<br>P equals 0.17"]
        E --> V4["No mortality association<br>P equals 0.997"]
        V3 --> X["Volume trend and safety signal only<br>NOT a treatment target<br>NOT a quality measure"]
        V4 --> X
        style Q fill:#e7f5ff,stroke:#1971c2,color:#000
        style A fill:#b2f2bb,stroke:#2f9e44,color:#000
        style B fill:#b2f2bb,stroke:#2f9e44,color:#000
        style C fill:#d0ebff,stroke:#1971c2,color:#000
        style D fill:#ffe8cc,stroke:#e8590c,color:#000
        style E fill:#ffc9c9,stroke:#e03131,color:#000
        style V1 fill:#b2f2bb,stroke:#2f9e44,color:#000
        style V2 fill:#d0ebff,stroke:#1971c2,color:#000
        style V3 fill:#ffe8cc,stroke:#e8590c,color:#000
        style V4 fill:#ffc9c9,stroke:#e03131,color:#000
        style X fill:#ff6b6b,stroke:#c92a2a,color:#fff

**Figure 2. What Each Blood Pressure Measurement Is Actually Telling You.** The two out-of-unit measurements are valid treatment targets; averaged intradialytic BP is an acceptable second line; the routine peridialytic readings are a volume trend and a safety signal only. P values are from a head-to-head mortality comparison in which home and ambulatory BP were measured in the same patients ^([7](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-7)). Adapted from the canonical review (drawn left to right).

## 4. Home versus in-center: the operational answer

Home BP monitoring is the practical replacement for ABPM. One week of duplicate morning and evening readings on a validated oscillometric device outperformed two weeks of averaged routine peridialytic readings for predicting ambulatory hypertension (AUC 0.934 versus 0.778 for pre-dialysis BP), with an optimal home systolic cut-point of 141.0 mmHg (sensitivity 85.7%, specificity 92.9%) ^([5](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-5)). Home BP also tracks *change*: in the DRIP cohort it captured the BP response to dry-weight probing that pre-dialysis readings blurred ^([17](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-17)).

The guidelines have moved the same way. The UK Kidney Association (UKKA) 2025 guideline suggests home or standardized out-of-unit BP to guide treatment (grade 2C) and in-unit BP to judge the safety of the session rather than to manage hypertension (2C) ^([15](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-15)). It sets no home-BP target; a practice point notes that home or standardized systolic BP of approximately 130 mmHg or lower tracks with the lowest risk ^([15](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-15)). The AHA 2023 scientific statement likewise favors out-of-unit measurement ^([1](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-1)).

### 4.1 Feasibility is answerable

The standing objection is that in-center patients will not measure at home. Two trials say otherwise. HDPAL (randomized) managed 200 in-center patients at a single center to a home BP target of \<140/90 mmHg with monthly home monitoring, across an enrollment that ran from 2005 to 2013 ^([28](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-28)). A 50-patient pilot randomized trial compared home-BP-guided with pre-dialysis-BP-guided management for 4 months: adherence to home reporting was 97.4%, with no excess of very high or very low pre-dialysis readings, though fatigue was more frequent in the home-BP arm (32% versus 16%) ^([29](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-29)).

A workable protocol from the same evidence base: a validated upper-arm oscillometric device, duplicate readings morning and evening, six to seven consecutive days including at least one non-dialysis day, averaged ^([5](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-5)). KDIGO 2020 also accepts twice-daily readings for 4 days after the midweek treatment ^([22](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-22)). Repeat after any major change in dry weight or regimen.

Warning — white-coat and masked hypertension

The pre-dialysis cuff misclassifies about one patient in three: by 48-hour ABPM, 18% have white-coat and 14% masked hypertension ^([2](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-2)). In BID participants followed with repeated home and pre-dialysis readings, nearly one-third had home BP *higher* than pre-dialysis BP, and that group had higher left ventricular mass ^([30](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-30)). Treating to the pre-dialysis number undertreats the masked group and overtreats the white-coat group.

### 4.2 A practical hierarchy

1.  44-hour ABPM at diagnosis and after major changes in dry weight or regimen.
2.  Home BP, ≥6 days, as the routine management metric.
3.  Averaged intradialytic BP (all readings, all three weekly sessions) if the first two are unavailable ^([6](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-6)).
4.  Routine pre- and post-dialysis BP: a safety signal and a volume trend, never a treatment target.

## 5. Does a high pre-dialysis BP predict cardiovascular outcomes?

### 5.1 As a guide to chronic treatment: poorly

Three cohorts (four analyses), each measuring both in-unit and out-of-unit BP in the same patients, give a consistent answer:

| Study (all observational) | Population | Peridialytic BP | Out-of-unit BP |
|----|----|----|----|
| Agarwal 2010 ^([7](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-7)) | 326 patients with simultaneous home, ambulatory, and two weeks of routine readings | Pre-dialysis systolic not significant once out-of-unit BP was measured (P = 0.17); post-dialysis P = 0.997 | Home and ambulatory systolic BP predicted mortality |
| Iatridi 2022 ^([16](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-16)) | 242 Greek patients, median 45.7 months | Pre-dialysis systolic was the one metric *not* associated with cardiovascular events | Intradialytic, scheduled interdialytic, and 44-h ambulatory systolic BP were associated |
| CRIC, mortality ^([31](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-31)) | CRIC participants who started hemodialysis | U-shaped association with mortality | A single standardized out-of-unit systolic BP was linearly associated: HR 1.26 per 10 mmHg (95% CI 1.14–1.40) |
| CRIC, cardiovascular events ^([32](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-32)) | Same cohort, adjudicated cardiovascular events | U-shaped (nadir risk between 140 and 170 mmHg) | Linear; more than a doubling of risk in the top two quartiles (≥128 mmHg) versus ≤112 mmHg |

The pattern is the important part. In the same patients, out-of-unit systolic BP relates linearly to death and cardiovascular events while dialysis-unit systolic BP stays U-shaped ^([7](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-7),[31](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-31),[32](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-32)). The familiar “reverse epidemiology” curve is largely a property of *where and when the reading is taken*.

### 5.2 As a marker of risk: yes, mostly at the low end

Registry analyses show U- or J-shaped associations for peridialytic systolic BP, with the signal dominated by low readings ^([9](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-9),[31](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-31),[32](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-32)). That is real information about the patient. It is not information that more antihypertensive treatment or more ultrafiltration will fix.

“No evidence that pre- or post-dialysis BP affects mortality” — what the evidence supports

**Defensible:** pre- and post-dialysis BP do not reliably predict outcome as a *treatment target*, and lowering them has never been shown to help ^([7](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-7),[16](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-16),[31](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-31),[33](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-33)).

**Not defensible:** that in-center BP carries no prognostic information. Low readings mark higher risk — facility-level pre-dialysis systolic BP of 110–129 mmHg ^([9](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-9)), pre-dialysis systolic BP \<110 mmHg with fluid overload ^([10](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-10)), and an intradialytic nadir systolic BP \<90 mmHg in ≥30% of sessions ^([8](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-8)) are all associated with death.

**“It’s the other 44 hours that drives mortality”** is useful prognostic shorthand, not causal proof. The out-of-unit association is observational ^([7](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-7),[31](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-31),[32](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-32)); the interdialytic intervals are approximately 44 h and 68 h, and the standard ABPM records only the shorter one ^([6](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-6)); events cluster after the long 68-hour interval ^([24](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-24)).

The accurate unit message: *in-center BP is a poor target for chronic treatment and a real signal for the safety of today’s session.*

### 5.3 Indirectly: yes, in two ways worth acting on

1.  **A persistently high pre-dialysis BP is a volume hypothesis until proven otherwise.** Hypervolemia, marked by flat relative plasma volume slopes, is independently associated with mortality ^([34](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-34)).
2.  **The BP *response* to volume removal is informative.** Patients whose ambulatory BP falls with dry-weight probing were volume-expanded ^([11](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-11),[35](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-35)). That reframes the pre-dialysis number as a hypothesis to be tested over weeks, not a target to be normalized on the machine.

## 6. Does a high pre-dialysis BP “allow” you to take more fluid?

Two different questions live inside this one, and they have opposite answers.

### 6.1 Within a single session: no

There is no evidence that a high starting systolic BP protects against intradialytic injury, and substantial evidence that the *rate* of removal is associated with harm independent of the starting pressure (all observational):

- In HEMO, an ultrafiltration rate (UFR) \>13 mL/h/kg was associated with higher all-cause (adjusted HR 1.59) and cardiovascular mortality (adjusted HR 1.71) compared with ≤10 mL/h/kg; 10–13 mL/h/kg carried risk in patients with heart failure ^([12](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-12)).
- In 118,394 patients, UFR \>13 (adjusted HR 1.31) and UFR \>10 mL/h/kg (adjusted HR 1.22) were both associated with greater mortality, consistently across subgroups and body-size normalizations ^([13](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-13)). KDIGO 2020 notes associations at rates as low as 6 mL/h/kg ^([22](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-22)).
- Ultrafiltration volume is an independent determinant of dialysis-induced regional wall motion abnormalities (myocardial stunning), which were present in 64% of patients and associated with lower ejection fraction and death at 12 months ^([14](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-14)).
- Facility practices around fluid removal correlate with patient outcomes, in both directions ^([36](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-36)).

A high starting BP raises the ceiling before the patient reaches a nadir threshold. It does not change plasma refill kinetics, splanchnic sequestration, or myocardial perfusion. The patient with a pre-dialysis systolic BP of 190 mmHg who has 4.5 L pulled in 3.5 hours is still stunning myocardium. Rate and time are covered in [Ultrafiltration rate and treatment time](https://urinenephrology.org/mastery/maintenance-hd/ultrafiltration-rate-treatment-time.html).

### 6.2 Across weeks: yes, and this is the correct use of the observation

DRIP (randomized controlled trial) enrolled 150 hypertensive hemodialysis patients, 100 to dry-weight probing without lengthening sessions and 50 to control ^([11](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-11)). The protocol added 0.1 kg per 10 kg body weight per session, halved the step whenever cramps, saline need, or symptomatic hypotension appeared, and declared dry weight reached when even a 0.2 kg step was not tolerated ^([11](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-11)):

| Endpoint (probing vs control) | 4 weeks | 8 weeks |
|----|----|----|
| Post-dialysis weight change | −0.9 kg | −1.0 kg |
| Interdialytic ambulatory systolic BP | −6.9 mmHg (95% CI −12.4 to −1.3) | −6.6 mmHg (−12.2 to −1.0) |
| Interdialytic ambulatory diastolic BP | −3.1 mmHg (−6.2 to −0.02) | −3.3 mmHg (−6.4 to −0.2) |
| Odds ratio for a systolic fall ≥10 mmHg | — | 2.24 (1.32–3.81) |

Intradialytic hypotensive signs and symptoms increased in the probing arm, and no KDQOL quality-of-life domain deteriorated ^([11](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-11)). The investigators also recorded at least three serious adverse events likely related to the intervention, including hypotension with seizure ^([11](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-11)). That is the real clinical exchange rate: more cramps and dips, occasionally worse, in return for genuine ambulatory BP reduction, with no measurable quality-of-life penalty.

Clinical Pearl — how to probe

In DRIP, approximately 1 kg of additional dry-weight reduction was accompanied by approximately 7 mmHg lower ambulatory systolic BP, evident by 4 weeks. Probe in small steps — DRIP started at 0.1 kg per 10 kg body weight per session and halved the step when it was not tolerated ^([11](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-11)); many units use smaller fixed steps, which is practice convention rather than trial protocol. Reassess at 4–8 weeks with home BP or ABPM, never with the next session’s pre-dialysis reading. And keep the UFR ceiling: DRIP probed without adding time, which is exactly how probing can turn into rate-driven harm (Section 6.1).

## 7. Dry weight is not the pre-dialysis BP, and it is not the edema exam

If the pre-dialysis BP is a volume hypothesis, the next question is how to test it. Clinical volume assessment performs poorly. Crackles and peripheral edema share only 12% and 4% of their variance with ultrasound-detected lung water in kidney failure ^([37](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-37)). BNP does not function as a volume marker in this population ^([38](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-38)). The adjuncts:

| Tool | What it shows | Outcome evidence |
|----|----|----|
| Lung ultrasound B-lines | Finds lung congestion that the exam misses | LUST (randomized, 363 high-cardiovascular-risk patients): congestion relieved more often with ultrasound guidance (78% vs 56%), but no significant effect on death, MI, or decompensated heart failure (HR 0.88; 95% CI 0.63–1.24) ^([39](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-39)). Useful for *finding* congestion; unproven as an outcome-improving protocol |
| Relative plasma volume slopes (Crit-Line) | Flat slopes indicate expansion | The flattest slopes predicted the greatest ambulatory systolic fall on probing in DRIP ^([35](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-35)) |
| Bioimpedance | Identifies subclinical overhydration | Outcome data are mixed; no hard-outcome benefit has been shown ^([22](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-22)) |

None of these tools replaces a planned probing trial judged by out-of-unit BP. Detailed dry-weight practice is covered in [Estimating dry weight: assessment, tools, probing](https://urinenephrology.org/mastery/maintenance-hd/dry-weight-assessment.html); what to do once the measurement is right is covered in [Treating hypertension on dialysis](https://urinenephrology.org/mastery/maintenance-hd/treating-hypertension-dialysis.html).

## Evidence gaps

- **No randomized trial has tested a home-BP-guided versus pre-dialysis-BP-guided strategy for hard outcomes** — only a 50-patient, 4-month feasibility pilot ^([29](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-29)).
- **No adequately powered trial of a BP target exists in hemodialysis.** BID was a 126-patient pilot with a safety signal and no definitive answer ^([33](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-33)); KDIGO 2020 and UKKA 2025 both list target trials as the top research need ^([15](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-15),[22](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-22)).
- **The out-of-unit mortality association is observational** ^([7](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-7),[31](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-31),[32](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-32)). It is strong prognostic evidence, not proof that lowering out-of-unit BP by any means will save lives.
- **How long the BP lag runs after a dry-weight change is unsettled**; DRIP found the ambulatory fall by 4 weeks and no support for a longer lag in its population ^([11](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-11)).
- **Volume tools find congestion but have not improved hard outcomes** as protocols ^([22](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-22),[39](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-39)).
- **Whether the mortality benefit of BP lowering holds when achieved by volume rather than drugs has never been directly tested**, though DRIP plus the Heerspink meta-analysis make it the most plausible reading ^([11](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-11),[40](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-40)).

## At the chair

Chair-side summary

**Home BP guides chronic therapy. Dialysis-unit BP guides the safety of today’s treatment.** For the chair: measure seated and rested with the correct cuff on the non-access arm, and repeat any high pre-dialysis reading after rest before acting on it ^([3](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-3),[15](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-15)); record the lowest intradialytic systolic BP every treatment ^([8](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-8),[22](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-22)); and do not raise the ultrafiltration goal on the strength of one high pre-dialysis reading ^([7](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-7),[15](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html#ref-15)). The nursing card turns this page into chair-side actions and call criteria.

[Nursing card N6: Blood pressure at the chair →](https://urinenephrology.org/mastery/maintenance-hd/nursing/N6-Blood-Pressure-at-the-Chair.html)

## References

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2.  Sarafidis PA, Mallamaci F, Loutradis C, et al. Prevalence and control of hypertension by 48-h ambulatory blood pressure monitoring in haemodialysis patients: a study by the European Cardiovascular and Renal Medicine (EURECA-m) working group of the ERA-EDTA. *Nephrol Dial Transplant*. 2019;34(9):1542–1548. [PMID: 30007295](https://pubmed.ncbi.nlm.nih.gov/30007295/)
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12. Flythe JE, Kimmel SE, Brunelli SM. Rapid fluid removal during dialysis is associated with cardiovascular morbidity and mortality. *Kidney Int*. 2011;79(2):250–257. [PMID: 20927040](https://pubmed.ncbi.nlm.nih.gov/20927040/)
13. Assimon MM, Wenger JB, Wang L, Flythe JE. Ultrafiltration rate and mortality in maintenance hemodialysis patients. *Am J Kidney Dis*. 2016;68(6):911–922. [PMID: 27575009](https://pubmed.ncbi.nlm.nih.gov/27575009/)
14. Burton JO, Jefferies HJ, Selby NM, McIntyre CW. Hemodialysis-induced cardiac injury: determinants and associated outcomes. *Clin J Am Soc Nephrol*. 2009;4(5):914–920. [PMID: 19357245](https://pubmed.ncbi.nlm.nih.gov/19357245/)
15. Doulton T, Adam M, Durman K, et al. Management of blood pressure in adults, children and young people on dialysis: UK Kidney Association clinical practice guideline. *BMC Nephrol*. 2025;26(1):532. [PMID: 41013409](https://pubmed.ncbi.nlm.nih.gov/41013409/)
16. Iatridi F, Theodorakopoulou MP, Karpetas A, et al. Association of peridialytic, intradialytic, scheduled interdialytic and ambulatory BP recordings with cardiovascular events in hemodialysis patients. *J Nephrol*. 2022;35(3):943–954. [PMID: 34988941](https://pubmed.ncbi.nlm.nih.gov/34988941/)
17. Agarwal R, Satyan S, Alborzi P, et al. Home blood pressure measurements for managing hypertension in hemodialysis patients. *Am J Nephrol*. 2009;30(2):126–134. [PMID: 19246891](https://pubmed.ncbi.nlm.nih.gov/19246891/)
18. K/DOQI Workgroup. K/DOQI clinical practice guidelines for cardiovascular disease in dialysis patients. *Am J Kidney Dis*. 2005;45(4 Suppl 3):S1–S153. [PMID: 15806502](https://pubmed.ncbi.nlm.nih.gov/15806502/)
19. National Kidney Foundation. KDOQI clinical practice guideline for hemodialysis adequacy: 2015 update. *Am J Kidney Dis*. 2015;66(5):884–930. [PMID: 26498416](https://pubmed.ncbi.nlm.nih.gov/26498416/)
20. Iatridi F, Theodorakopoulou MP, Sarafidis P. Post-dialytic blood pressure in hemodialysis patients: still an inaccurate metric. *Hypertens Res*. 2025;48(6):2012–2013. [PMID: 40175675](https://pubmed.ncbi.nlm.nih.gov/40175675/)
21. Assimon MM, Flythe JE. Definitions of intradialytic hypotension. *Semin Dial*. 2017;30(6):464–472. [PMID: 28691195](https://pubmed.ncbi.nlm.nih.gov/28691195/)
22. Flythe JE, Chang TI, Gallagher MP, et al; Conference Participants. Blood pressure and volume management in dialysis: conclusions from a Kidney Disease: Improving Global Outcomes (KDIGO) Controversies Conference. *Kidney Int*. 2020;97(5):861–876. [PMID: 32278617](https://pubmed.ncbi.nlm.nih.gov/32278617/)
23. Agarwal R, Weir MR. Dry-weight: a concept revisited in an effort to avoid medication-directed approaches for blood pressure control in hemodialysis patients. *Clin J Am Soc Nephrol*. 2010;5(7):1255–1260. [PMID: 20507951](https://pubmed.ncbi.nlm.nih.gov/20507951/)
24. Foley RN, Gilbertson DT, Murray T, Collins AJ. Long interdialytic interval and mortality among patients receiving hemodialysis. *N Engl J Med*. 2011;365(12):1099–1107. [PMID: 21992122](https://pubmed.ncbi.nlm.nih.gov/21992122/)
25. Agarwal R, Peixoto AJ, Santos SF, Zoccali C. Pre- and postdialysis blood pressures are imprecise estimates of interdialytic ambulatory blood pressure. *Clin J Am Soc Nephrol*. 2006;1(3):389–398. [PMID: 17699236](https://pubmed.ncbi.nlm.nih.gov/17699236/)
26. Agarwal R, Brim NJ, Mahenthiran J, Andersen MJ, Saha C. Out-of-hemodialysis-unit blood pressure is a superior determinant of left ventricular hypertrophy. *Hypertension*. 2006;47(1):62–68. [PMID: 16344376](https://pubmed.ncbi.nlm.nih.gov/16344376/)
27. Alborzi P, Patel N, Agarwal R. Home blood pressures are of greater prognostic value than hemodialysis unit recordings. *Clin J Am Soc Nephrol*. 2007;2(6):1228–1234. [PMID: 17942773](https://pubmed.ncbi.nlm.nih.gov/17942773/)
28. Agarwal R, Sinha AD, Pappas MK, Abraham TN, Tegegne GG. Hypertension in hemodialysis patients treated with atenolol or lisinopril: a randomized controlled trial. *Nephrol Dial Transplant*. 2014;29(3):672–681. [PMID: 24398888](https://pubmed.ncbi.nlm.nih.gov/24398888/)
29. Bansal N, Glidden DV, Mehrotra R, et al. Treating home versus predialysis blood pressure among in-center hemodialysis patients: a pilot randomized trial. *Am J Kidney Dis*. 2021;77(1):12–22. [PMID: 32800842](https://pubmed.ncbi.nlm.nih.gov/32800842/)
30. Miskulin DC, Jiang H, Gul A, et al. Comparison of dialysis unit and home blood pressures: an observational cohort study. *Am J Kidney Dis*. 2021;78(5):640–648. [PMID: 34144104](https://pubmed.ncbi.nlm.nih.gov/34144104/)
31. Bansal N, McCulloch CE, Rahman M, et al; CRIC Study Investigators. Blood pressure and risk of all-cause mortality in advanced chronic kidney disease and hemodialysis: the Chronic Renal Insufficiency Cohort study. *Hypertension*. 2015;65(1):93–100. [PMID: 25287404](https://pubmed.ncbi.nlm.nih.gov/25287404/)
32. Bansal N, McCulloch CE, Lin F, et al; CRIC Study Investigators. Blood pressure and risk of cardiovascular events in patients on chronic hemodialysis: the CRIC Study (Chronic Renal Insufficiency Cohort). *Hypertension*. 2017;70(2):435–443. [PMID: 28674037](https://pubmed.ncbi.nlm.nih.gov/28674037/)
33. Miskulin DC, Gassman J, Schrader R, et al. BP in dialysis: results of a pilot study. *J Am Soc Nephrol*. 2018;29(1):307–316. [PMID: 29212839](https://pubmed.ncbi.nlm.nih.gov/29212839/)
34. Agarwal R. Hypervolemia is associated with increased mortality among hemodialysis patients. *Hypertension*. 2010;56(3):512–517. [PMID: 20625076](https://pubmed.ncbi.nlm.nih.gov/20625076/)
35. Sinha AD, Light RP, Agarwal R. Relative plasma volume monitoring during hemodialysis aids the assessment of dry weight. *Hypertension*. 2010;55(2):305–311. [PMID: 20038754](https://pubmed.ncbi.nlm.nih.gov/20038754/)
36. Dasgupta I, Thomas GN, Clarke J, et al. Associations between hemodialysis facility practices to manage fluid volume and intradialytic hypotension and patient outcomes. *Clin J Am Soc Nephrol*. 2019;14(3):385–393. [PMID: 30723164](https://pubmed.ncbi.nlm.nih.gov/30723164/)
37. Torino C, Gargani L, Sicari R, et al. The agreement between auscultation and lung ultrasound in hemodialysis patients: the LUST study. *Clin J Am Soc Nephrol*. 2016;11(11):2005–2011. [PMID: 27660305](https://pubmed.ncbi.nlm.nih.gov/27660305/)
38. Agarwal R. B-type natriuretic peptide is not a volume marker among patients on hemodialysis. *Nephrol Dial Transplant*. 2013;28(12):3082–3089. [PMID: 23525529](https://pubmed.ncbi.nlm.nih.gov/23525529/)
39. Zoccali C, Torino C, Mallamaci F, et al. A randomized multicenter trial on a lung ultrasound-guided treatment strategy in patients on chronic hemodialysis with high cardiovascular risk. *Kidney Int*. 2021;100(6):1325–1333. [PMID: 34418415](https://pubmed.ncbi.nlm.nih.gov/34418415/)
40. Heerspink HJ, Ninomiya T, Zoungas S, et al. Effect of lowering blood pressure on cardiovascular events and mortality in patients on dialysis: a systematic review and meta-analysis of randomised controlled trials. *Lancet*. 2009;373(9668):1009–1015. [PMID: 19249092](https://pubmed.ncbi.nlm.nih.gov/19249092/)

### Also in this module

Blood pressure, volume, and the dialysis prescription, one question per page.

- [Treating hypertension on dialysis: targets, trials, agents, dose timing](https://urinenephrology.org/mastery/maintenance-hd/treating-hypertension-dialysis.html)
- [Intradialytic hypertension and the stability trade-off](https://urinenephrology.org/mastery/maintenance-hd/intradialytic-hypertension.html)
- [Perspective: peridialytic BP as a quality measure](https://urinenephrology.org/mastery/maintenance-hd/peridialytic-bp-quality-measure.html)
- [Estimating dry weight: assessment, tools, probing](https://urinenephrology.org/mastery/maintenance-hd/dry-weight-assessment.html)
- [Ultrafiltration rate and treatment time](https://urinenephrology.org/mastery/maintenance-hd/ultrafiltration-rate-treatment-time.html)
- [Intradialytic hypotension and dialysate cooling](https://urinenephrology.org/mastery/maintenance-hd/intradialytic-hypotension-cooling.html)
- [Dialysate sodium: BP, thirst, IDH, and the RESOLVE question](https://urinenephrology.org/mastery/maintenance-hd/dialysate-sodium.html)
- [Maintenance Hemodialysis — module index](https://urinenephrology.org/mastery/maintenance-hd/index.html)
- [Hypertension — advanced module](https://urinenephrology.org/mastery/hypertension-advanced/index.html)


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[Website version](https://urinenephrology.org/mastery/maintenance-hd/blood-pressure-measurement-dialysis.html) · Markdown synchronized October 3, 2026.