Clinical changes of cardiac function from high altitude returning to plain

Area of Science:

• Cardiology
• Altitude Physiology
• Environmental Medicine

Background:

• Cardiac function at high altitude and upon return to plains is not well understood.
• Altitude exposure can induce physiological changes impacting cardiovascular health.

Purpose of the Study:

• To investigate changes in cardiac enzymes and echocardiographic parameters in individuals moving from high altitude to plains.
• To explore the relationship between cardiac enzymes and echocardiographic findings in this population.

Main Methods:

• Medical examinations of 36 young male migrants returning from 4,888-5,418 m to 400 m.
• Collection of baseline characteristics, hematological, and echocardiographic data.
• Analysis of three myocardial enzymes (LDH, CK-MB, CK) and echocardiographic measurements.

Main Results:

• Lactate dehydrogenase (LDH) significantly decreased upon return to plain.
• Left atrium, right ventricular outflow tract, and left ventricular dimensions were smaller at high altitude.
• At high altitude, LDH and creatine kinase-MB (CK-MB) correlated positively with right atrium and right ventricle diameters.

Conclusions:

• The study provides comprehensive cardiac function data for individuals returning from high altitude to plains.
• Findings may aid in understanding altitude-induced cardiomyopathic injury and cardiovascular disease.
• Observed changes highlight the dynamic nature of cardiac adaptation to varying altitudes.