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Quantitative electrocardiography during extended space flight.

R F Smith1, K Stanton, D Stoop

  • 1Vanderbilt University, School of Medicine, Nashville, Tennessee 37232, USA.

Acta Astronautica
|January 1, 1975
PubMed
Summary
This summary is machine-generated.

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Prolonged space flight caused heart electrophysiology changes, including altered heart rate and electrical signal patterns. However, most cardiac arrhythmias were temporary, with no lasting negative effects observed post-Skylab mission.

Area of Science:

  • Cardiovascular Physiology
  • Space Medicine
  • Biomedical Engineering

Background:

  • Understanding the impact of prolonged space missions on astronaut cardiovascular health is crucial.
  • Electrophysiological changes in the heart during spaceflight require detailed investigation.

Purpose of the Study:

  • To evaluate the effects of extended spaceflight on the electrophysiological characteristics of the heart.
  • To assess cardiac function and identify potential arrhythmias in astronauts.

Main Methods:

  • Vectorcardiograms (VCG) were recorded from Skylab crews during pre-flight, in-flight, and post-flight periods.
  • VCG data were analyzed using digital computers, with conventional 12-lead electrocardiograms derived.
  • Standardized exercise tests were integrated to enhance sensitivity to deconditioning and arrhythmias.
Keywords:
NASA Experiment Number M093NASA Experiment Number M171

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Main Results:

  • Significant in-flight changes included decreased resting heart rate, increased QRS duration, and altered QRS and T vector magnitudes and directions.
  • One astronaut experienced premature ventricular contractions (PVCs) during exercise in-flight and post-flight.
  • A second astronaut developed PVCs and ectopic beats 21 days post-flight, which resolved.

Conclusions:

  • Spaceflight induced notable electrophysiological alterations in the heart, such as changes in heart rate and electrical vector patterns.
  • While some astronauts experienced transient cardiac arrhythmias, these were generally not considered deleterious or long-lasting.
  • The study indicates that most electrophysiological changes related to spaceflight are reversible, with arrhythmias being the primary exception.