Cited by 213Obstructive Sleep Apnea ResearchBlood Pressure and Hypertension StudiesSleep and related disorders

Relationship Between Overnight Rostral Fluid Shift and Obstructive Sleep Apnea in Drug-Resistant Hypertension

Open access
Friedman, Oded, Bradley, T. Douglas, Chan, Christopher T., Parkes, Robert, Logan, Alexander G.·2010·Hypertension

Abstract

Obstructive sleep apnea occurs frequently in patients with drug-resistant hypertension. The factors accounting for this observation, however, are unclear. Both conditions demonstrate clinical features suggestive of extracellular fluid volume overload. The aims of this study were to examine whether the spontaneous overnight fluid shift from the legs to the upper body is associated with obstructive sleep apnea in hypertensive subjects and whether its magnitude is greater in drug-resistant hypertension. Leg fluid volume and the circumference of the calf and neck were measured before and after sleep in drug-resistant hypertensive (n=25) and controlled hypertensive (n=15) subjects undergoing overnight polysomnography. The severity of obstructive sleep apnea was greater in the drug-resistant hypertensive group than in the controlled hypertensive group (apnea-hypopnea index: 43.0±5.4 versus 18.1±4.2 events per hour of sleep; P =0.02, case-mix adjusted). In both groups, the apnea-hypopnea index strongly related to the amount of leg fluid volume displaced ( R 2 =0.56; P <0.0001), although the magnitude of change was greater in the drug-resistant hypertensive group (346.7±24.1 versus 175.8±31.3 mL; P =0.01, propensity-score adjusted). The overnight reduction in calf circumference and increase in neck circumference were also greater in drug-resistant hypertension (both P ≤0.02). In hypertensive subjects, rostral fluid displacement strongly relates to the severity of obstructive sleep apnea with its magnitude being greater in drug-resistant hypertension. Our findings support the concept that fluid redistribution centrally during sleep accounts for the high prevalence of obstructive sleep apnea in drug-resistant hypertension.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1161/hypertensionaha.110.154427

Cites

40 of 40 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Other studies implicate excessive accumulation of fluid centrally, including in the neck, as an important contributor to obstructive sleep apnea severity in patients with resistant hypertension by demonstrating increased shifting of fluid from the lower extremities into the upper body during supine sleep.

    “Other studies implicate excessive accumulation of fluid centrally, including in the neck, as an important contributor to OSA severity in patients with RH by demonstrating increased shifting of fluid from the lower extremities into the upper body during supine sleep.283”

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

1 of the 41 references couldn’t be matched to a known paper.

Research works printed but not linked: 1

  1. Friedman O, Logan AG. Treatment of hypertension in sleep apnea. In: Bradley TD, Floras JS, eds. Sleep Apnea: Implications in Cardiovascular and Cerebrovascular Disease. 2nd ed. New York, NY: Informa Healthcare USA, Inc; 2010:180 -191.

Cited by

Sorted by citations

Authors
Friedman, O., Bradley, T. D., Chan, C. T., Parkes, R., & Logan, A. G.
Affiliations
Mount Sinai Hospital (CA)
Venue
Hypertension
Published
2010-12
Volume
56
Issue
6
Pages
1077-1082
ISSN
  • 0194-911X (ISSN-L)
  • 1524-4563
OpenAlex
W2137574560
Cited by
213
References
41
Citations by year
2026: 6 · 2025: 4 · 2024: 5 · 2023: 13 · 2022: 9 · 2021: 11 · 2020: 10 · 2019: 15 · 2018: 13 · 2017: 13 · 2016: 9 · 2015: 22 · 2014: 23 · 2013: 16 · 2012: 29
FWCI
12.98
Type
journal article
Language
en
Open access
Locations
  • Hypertension (publishedVersion)
  • PubMed (publishedVersion)
Funders
Canadian Institutes of Health Research (MOP82731)
Topics
  • Health Sciences › Medicine › Physiology › Obstructive Sleep Apnea Research
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Blood Pressure and Hypertension Studies
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
Keywords
obstructive sleep apnea, resistant hypertension, calf circumference, neck circumference, apnea-hypopnea index, sleep
MeSH terms
Aged, Antihypertensive Agents, Diuretics, Drug Resistance, Female, Humans, Hypertension, Male, Middle Aged, Severity of Illness Index, Cohort Studies, Fluid Shifts, Sleep Apnea, Obstructive

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review