Cerebral hemodynamic changes at high altitude in adults: a systematic review and meta-analysis of transcranial Doppler and duplex ultrasound studies.
J Pierre Zila-Velasque, Pamela Grados-Espinoza, Sebastian Abanto-Urbano et al.
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In 30 seconds
This systematic review and meta-analysis evaluated cerebral hemodynamic changes in adults exposed to altitudes of 1,500 m or higher. Analyzing 55 studies with 1,935 participants, the research found significant reductions in mean cerebral artery velocity (MD -5.79 cm/s) and volumetric blood flow (MD -32.99 mL/min) among other parameters, highlighting the variability in responses between native high-altitude populations and lowlanders.
Key findings
- Altitude exposure reduced mean cerebral artery velocity by 5.79 cm/s.
- Volumetric blood flow decreased by 32.99 mL/min at high altitude.
- Cerebral oxygen saturation was lower by 4.45% in high-altitude conditions.
- Substantial heterogeneity was observed across different outcomes.
Why it matters
Understanding the impact of high altitude on cerebral hemodynamics is crucial for clinicians managing patients in or traveling to elevated regions. The findings emphasize the need for tailored approaches based on population-specific adaptations to hypoxia.