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Ambulatory and central haemodynamics during progressive ascent to high-altitude and associated hypoxia

Citation

Schultz, MG and Climie, RED and Sharman, JE, Ambulatory and central haemodynamics during progressive ascent to high-altitude and associated hypoxia, Journal of Human Hypertension, 28, (12) pp. 705-710. ISSN 0950-9240 (2014) [Refereed Article]

Copyright Statement

Copyright 2014 Macmillan Publishers Limited.

DOI: doi:10.1038/jhh.2014.15

Abstract

High-altitude hypoxia causes major cardiovascular changes, which may result in raised resting brachial blood pressure (BP). However, the effect of high-altitude hypoxia on more sensitive measures of BP control (such as 24 h ambulatory BP and resting central BP) is largely unknown. This study aimed to assess this and compare high-altitude responses to resting brachial BP, as well as determine the haemodynamic correlates of acute mountain sickness (AMS) during a progressive trekking ascent to high-altitude. Measures of oxygen saturation (pulse oximetry), 24 h ambulatory BP, resting brachial and central BP (Pulsecor) were recorded in 10 adults (aged 274, 30% male) during a 9-day trek to Mount Everest base camp, Nepal. Data were recorded at sea level (stage 1; <450 m above sea level (ASL)) and at progressive ascension to 3440 m ASL (stage 2), 4350 m ASL (stage 3) and 5164 m ASL (stage 4). The Lake Louise score (LLS) was used to quantify AMS symptoms. Total LLS increased stepwise from sea level to stage 4 (0.30.7 vs 4.42.0, P=0.012), whereas oxygen saturation decreased to 779% (P=0.001). The highest recordings of 24 h ambulatory, daytime, night time, brachial and central systolic BP and diastolic BP were achieved at stage 3, which were significantly greater than at sea level (P<0.005 for all). Twenty-four-hour ambulatory heart rate (HR) and night HR correlated with oxygen saturation (r=-0.741 and -0.608, both P<0.001) and total LLS (r=0.648 and r=0.493, both P<0.001). We conclude that 24 h ambulatory BP, central BP and HR are elevated during high-altitude hypoxia, but AMS symptoms are only related to tachycardia.

Item Details

Item Type:Refereed Article
Research Division:Medical and Health Sciences
Research Group:Cardiorespiratory Medicine and Haematology
Research Field:Cardiology (incl. Cardiovascular Diseases)
Objective Division:Health
Objective Group:Clinical Health (Organs, Diseases and Abnormal Conditions)
Objective Field:Cardiovascular System and Diseases
Author:Schultz, MG (Dr Martin Schultz)
Author:Climie, RED (Miss Rachel Climie)
Author:Sharman, JE (Professor James Sharman)
ID Code:96984
Year Published:2014
Web of Science® Times Cited:2
Deposited By:Menzies Institute for Medical Research
Deposited On:2014-11-27
Last Modified:2017-11-03
Downloads:0

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