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Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
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Updated: Nov 23, 2025

Exploring the Effects of Spaceflight on Mouse Physiology using the Open Access NASA GeneLab Platform
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Long-term spaceflight and the cardiovascular system.

Nicholas A Vernice1, Cem Meydan1, Ebrahim Afshinnekoo1

  • 1The Bin Talal Bin Abdulaziz Alsaud Institute for Computational Biomedicine, Weill Cornell Medicine, 1305 York Avenue, New York, NY 10021, USA.

Precision Clinical Medicine
|January 4, 2021
PubMed
Summary
This summary is machine-generated.

Long-term spaceflight significantly impacts cardiovascular health, causing fluid shifts and altering blood pressure regulation. Astronauts face risks like arrhythmias and arterial degeneration, requiring careful monitoring for future space missions.

Keywords:
aerospace medicinecardiovascular systemmicrogravityspaceflight

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Area of Science:

  • Cardiovascular Physiology
  • Space Medicine
  • Astrobiology

Background:

  • Early spaceflight studies suggested reversible physiological adaptation.
  • Long-term spaceflight effects (>6 months) on the cardiovascular system remain less understood.
  • Microgravity and radiation exposure profoundly impact astronaut health.

Purpose of the Study:

  • To investigate the conclusive physiological effects of long-term spaceflight on the cardiovascular system.
  • To detail cardiovascular changes including fluid shifts, pressure regulation, and cardiac structure.
  • To identify risks associated with deep space radiation on the heart and vasculature.

Main Methods:

  • Analysis of physiological data from long-term spaceflight missions.
  • Review of studies on microgravity-induced fluid shifts and baroreceptor responses.
  • Examination of radiation effects on cardiac tissues and arterial health.

Main Results:

  • Cephalad fluid translocation, altered arterial pressure, and decreased central venous pressure observed.
  • Plasma volume reduction (10%-15%), myocyte atrophy, and hematocrit alterations noted.
  • Arrhythmias, QT interval prolongation, coronary artery degeneration, aortic stiffness, and accelerated atherosclerosis reported.

Conclusions:

  • Long-term spaceflight induces significant cardiovascular risks, including orthostatic intolerance and altered sympathetic responses.
  • Deep space radiation accelerates atherosclerosis and promotes a pro-inflammatory state.
  • Continuous cardiac monitoring is crucial for astronaut safety during extended missions and upon return.