Effects of hypobaric hypoxia exposure at high altitude on left ventricular twist in healthy subjects: Data from HIGHCARE study on Mount Everest

G. Osculati, Miriam Revera, Giovanna Branzi, Andrea Faini, Gabriella Malfatto, Grzegorz Bilo, Andrea Giuliano, Francesca Gregorini, Francesca Ciambellotti, Carolina Lombardi, Piergiuseppe Agostoni, Giuseppe Mancia, Gianfranco Parati

Research output: Contribution to journalArticle

Abstract

Aims Previous studies investigating the effect of hypoxia on left ventricle focused on its global function, an approach that may not detect a selective dysfunction of subendocardial layers that are most sensitive to an inadequate oxygen supply. In the HIGHCARE study, aimed at exploring the effects of high altitude hypoxia on multiple biological variables and their modulation by an angiotensin receptor blocker, we addressed the effects of hypobaric hypoxia on both systolic and diastolic left ventricular geometry and function, focusing on echocardiographic assessment of left ventricle twist to indirectly examine subendocardial left ventricular systolic function. Methods and results In 39 healthy subjects, physiological and echocardiographic variables, including left ventricular twist and a simplified torsion-To-shortening ratio (sTSR), were recorded at sea level, at 3400 m, and at 5400 m altitude (Mount Everest base camp). Both left ventricular twist and sTSR were greater at 5400 m than at sea level (12.68 vs. 9.68 and 0.285 vs. 0.202, P <0.05 for both), were linearly related to the reduction in arterial oxygen partial pressure (P <0.01 for both), and were associated with significant changes in LV dimensions and contractility. No effects of angiotensin receptor blockade were observed on these variables throughout the study. Conclusion Our study, for the first time, demonstrates an increase in left ventricular twist at high altitude in healthy subjects exposed to high altitude hypoxia, suggesting the occurrence of subendocardial systolic dysfunction in such condition.

Original languageEnglish
Pages (from-to)635-643
Number of pages9
JournalEuropean Heart Journal Cardiovascular Imaging
Volume17
Issue number6
DOIs
Publication statusPublished - Jun 1 2016

Keywords

  • High Altitude
  • Hypobaric Hypoxia
  • Left Ventricular Twist And Torsion
  • Subendocardial Left Ventricle Function

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Radiology Nuclear Medicine and imaging

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