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February 26, 2013HypertensionOpen Access

Changes in Subendocardial Viability Ratio With Acute High-Altitude Exposure and Protective Role of Acetazolamide

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Why the study?

Does acetazolamide improve subendocardial viability ratio and oxygen supply/demand ratio in healthy subjects during acute high-altitude exposure?

Population

44 healthy subjects (21 men, age range: 24-59 years)

Comparison

Acetazolamide 250 mg bid vs Placebo

Design

RCT, randomized, double-blind

Follow-up

3 days at high altitude

Key result

Acetazolamide attenuated the reduction in oxygen supply/demand ratio during acute high-altitude exposure compared to placebo (22.3 vs 17.3; P<0.001).

Authors

PSPaolo SalviMRMiriam ReveraAFAndrea Faini

Discussion

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Overview

Acetazolamide may mitigate hypoxia-related cardiac strain at altitude; extends RCT evidence to subendocardial oxygen indices in healthy subjects.

Study Design

Type

RCT (n=44)

Blinding

Double-blind

Randomization

randomized

Structured PICO

Does acetazolamide improve subendocardial viability ratio and oxygen supply/demand ratio in healthy subjects during acute high-altitude exposure?

P
Population
44 healthy subjects (21 men, age range: 24-59 years)
I
Intervention
Acetazolamide 250 mg bid
C
Comparator
Placebo
O
Outcome
Subendocardial viability ratio and oxygen supply/demand ratio estimated on carotid artery by means of a validated PulsePen tonometersurrogate

Main Result

Absolute Event Rate: 22.3% vs 17.3%

p-value: p=<0.001

Acetazolamide may antagonize the reduction in subendocardial oxygen supply triggered by exposure to hypobaric hypoxia in healthy subjects.

Limitations

  • Needs confirmation in subjects with known or subclinical coronary artery disease
  • Study involved only healthy subjects; further studies needed in subjects with known or subclinical coronary artery disease

Cite This Study

Salvi et al. (2013) conducted an RCT in Healthy subjects exposed to high altitude (n=44). Acetazolamide vs. Placebo was evaluated on Oxygen supply/demand ratio at high altitude (p=<0.001). Acetazolamide attenuated the reduction in oxygen supply/demand ratio during acute high-altitude exposure compared to placebo (22.3 vs 17.3; P<0.001).

synapsesocial.com/papers/6a153e66b2e0231f158226cchttps://doi.org/10.1161/hypertensionaha.111.00707
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