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The Annals of Thoracic Surgery, Vol 53, 425-429, Copyright © 1992 by The Society of Thoracic Surgeons

ARTICLES

Adverse hemodynamic effects of pericardial closure soon after open heart operation

S Hunter, GH Smith and GD Angelini
Department of Cardiac Surgery, University of Sheffield, Northern General Hospital, United Kingdom.

The short-term hemodynamic effects of pericardial closure on cardiac function were studied during steady-state anesthesia and ventilation in 10 patients (6 men) (mean age, 59 +/- 9 years) who underwent an open- heart valve operation. Observations were made after the heart was decannulated, both while the pericardium was open and after it had been closed, and then after closure of the chest after the pericardium had been reopened by removing the pericardial suture through the chest wall. The effect of closing the pericardium before closing the chest was an immediate reduction in cardiac output (thermodilution) of 1.39 +/- 0.24 L/min from 5.09 +/- 0.40 L/min (p less than 0.001). The heart rate remained stable, but there was a decrease in stroke volume of 29% and an increase in systemic vascular resistance of 34% (both, p less than 0.01). The mean arterial pressure increased slightly by 2% (not significant). Opening the pericardium (1.5 to 2 hours after the end of the operation) while the chest remained closed was followed by an increase in cardiac output of 1.33 +/- 0.15 L/min from 4.12 +/- 0.62 L/min (p less than 0.001). As the heart rate and the mean blood pressure changed insignificantly, there was an increase in stroke volume of 15 +/- 3 mL from 53 +/- 5 mL and a reduction in systemic vascular resistance of 473 +/- 83 dyne . s . cm-5 from 1,721 +/- 181 dyne.s.cm-5 (both, p less than 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)

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