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Left ventricular performance during psychological stress.

D Z Young1, J E Dimsdale, R H Moore

  • 1Department of Radiology, Massachusetts General Hospital, Boston.

European Journal of Nuclear Medicine
|January 1, 1989
PubMed
Summary
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Psychological stress significantly elevates systolic blood pressure and norepinephrine levels. While individual ejection fraction varied, overall heart contractility increased during stress in both normotensive and hypertensive subjects.

Area of Science:

  • Cardiology
  • Human Physiology
  • Psychophysiology

Background:

  • Psychological stress impacts cardiovascular function.
  • Understanding stress responses in normotensive versus hypertensive individuals is crucial.

Purpose of the Study:

  • To investigate the cardiovascular and neuroendocrine responses to psychological stress.
  • To compare stress effects on left ventricular ejection fraction, blood pressure, and norepinephrine levels in normotensive and hypertensive subjects.

Main Methods:

  • Measurements of left ventricular ejection fraction, systolic blood pressure, and plasma norepinephrine.
  • Comparison between rest and psychological stress conditions.
  • Inclusion of both normotensive and mildly hypertensive participants.

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Main Results:

  • All subjects showed significant increases in systolic blood pressure and plasma norepinephrine during stress.
  • Eight out of twelve subjects exhibited significant changes in ejection fraction.
  • Mean ejection fraction and stroke volume remained unchanged across the group, suggesting increased left ventricular contractility.

Conclusions:

  • Psychological stress triggers significant sympathetic nervous system activation.
  • Despite varied individual ejection fraction responses, overall cardiac contractility is enhanced during stress.
  • These findings highlight the complex cardiovascular adjustments to psychological stressors.