Abstract
The effects of nitrous oxide on left ventricular diastolic function and its potential interactions with ischemia-induced diastolic dysfunction have not been described. Accordingly, we investigated the effects of nitrous oxide in ischemic and remote nonischemic myocardium during baseline, 90 min severe low-flow myocardial ischemia (systolic bulge), and reperfusion in 11 open-chest dogs. Anesthesia was maintained with fentanyl infusion (2 micrograms.kg-1.min-1), animals were ventilated with 60% nitrogen in oxygen, and hemodynamic variables were recorded prior to and after the replacement of nitrogen by 60% nitrous oxide. During baseline, nitrous oxide moderately increased chamber stiffness (+ 10%), myocardial stiffness (+33%), and unstressed length (+4%) and decreased the peak lengthening rate (-10%). Moreover, nitrous oxide decreased regional contractility during baseline (-12% at apex, -8% at base) as well as in nonischemic myocardium during myocardial ischemia (-9%) and reperfusion (-8%). However, nitrous oxide did not modify ischemia-induced systolic or diastolic dysfunction in ischemic myocardium during ischemia and reperfusion. Myocardial ischemia (+45%) and reperfusion (+57%) were associated with an increase in myocardial ...Continue Reading
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Nov 22, 2000·Medical Engineering & Physics·L S WongP Foëx
Aug 17, 2011·Echocardiography·Gerald BuckbergConstantine Athanasuleas
Aug 5, 2011·Anesthesia and Analgesia·Robina MatyalFeroze Mahmood