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Triiodothyronine optimizes sheep ventriculoarterial coupling for work efficiency

F V DiPierro1, J E Bavaria, E B Lankford

  • 1Division of Cardiothoracic Surgery, Hospital of the University of Pennsylvania, Philadelphia 19104-4283, USA.

The Annals of Thoracic Surgery
|September 1, 1996
PubMed
Summary
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Triiodothyronine (T3) bolus administration improves cardiac efficiency by optimizing ventriculoarterial coupling without increasing oxygen consumption. This contrasts with dobutamine, which increases cardiac work at a higher oxygen cost, making T3 a potentially superior agent for cardiac operations.

Area of Science:

  • Cardiology
  • Cardiovascular Physiology
  • Pharmacology

Background:

  • Cardiopulmonary bypass often necessitates interventions to support cardiac function.
  • Triiodothyronine (T3) has demonstrated potential in improving cardiac performance post-cardiopulmonary bypass.

Purpose of the Study:

  • To investigate the effects of intravenous bolus T3 administration on cardiac energetics and stroke work-oxygen utilization (EW/LVVO2) efficiency.
  • To compare the effects of T3 with dobutamine on cardiac efficiency in both unstressed and stressed heart conditions.

Main Methods:

  • An in vivo sheep model was used to evaluate cardiac energetics at baseline and 2 hours post-intervention.
  • Sheep received either a saline vehicle, an intravenous bolus of T3 (1.2 micrograms/kg), or a 2-hour infusion of dobutamine (5 micrograms/kg/min).

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Main Results:

  • In unstressed hearts, T3 improved cardiac function and EW/LVVO2 efficiency by decreasing afterload, without increasing oxygen consumption.
  • Dobutamine enhanced unstressed cardiac function by increasing contractility but decreased EW/LVVO2 efficiency due to higher oxygen costs.
  • T3 improved EW/LVVO2 efficiency in stressed hearts, whereas dobutamine had an adverse effect.

Conclusions:

  • Intravenous bolus T3 optimizes ventriculoarterial coupling for EW/LVVO2 efficiency, primarily via vasodilation, improving cardiac performance without augmenting oxygen demand.
  • T3 enhances cardiac efficiency in both unstressed and stressed states, supporting its use in cardiac surgery.
  • Unlike inotropic agents, T3 improves cardiac performance without the associated increase in oxygen consumption.