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Poststenotic ischaemic myocardial dysfunction induced by peripheral nociceptive stimulation.

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Acute somatic pain can trigger ischemic myocardial dysfunction in severe coronary stenosis via sympathetic nerve activation. Fentanyl administration effectively prevents both pain and this cardiac dysfunction.

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Area of Science:

  • Cardiovascular Physiology
  • Pain Management
  • Autonomic Nervous System

Background:

  • Sympathetic activation normally enhances cardiac function by increasing coronary blood flow.
  • However, in severe coronary stenosis, sympathetic nerve activation can cause alpha 2-adrenergic coronary constriction, leading to myocardial ischemia.

Purpose of the Study:

  • To investigate the impact of acute somatic pain on regional myocardial function in the presence of severe coronary stenosis.
  • To determine if fentanyl can mitigate pain-induced myocardial dysfunction.

Main Methods:

  • Utilized a canine model with induced sympathetic nerve activation via electrical stimulation.
  • Measured regional myocardial function using sonomicrometry to assess wall thickness in stenotic and control regions.
  • Administered fentanyl intravenously to assess its protective effects.

Main Results:

  • Nociceptive stimulation initially improved systolic wall thickening in normal myocardium.
  • In the presence of severe coronary stenosis, nociceptive stimulation significantly reduced poststenotic myocardial systolic wall thickening.
  • Fentanyl administration prevented the decrease in myocardial function during nociceptive stimulation.

Conclusions:

  • Acute somatic pain, through sympathetic nerve activation, can induce ischemic myocardial dysfunction distal to a coronary stenosis.
  • Fentanyl effectively blocks both the perception of pain and the associated detrimental effects on myocardial function.