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• W1596050176 abstract "Objectives. This study determined the effects of inhaled nitric oxide (NO) on load-independent indexes of normal human left ventricular (LV) function. Background. Inhaled NO is a potent and selective pulmonary vasodilator. However, when it is used in patients with congestive heart failure, the decrease in pulmonary vascular resistance (PVR) is often associated with an increase in pulmonary capillary wedge pressure. NO has been shown to have a negative inotropic action, but it is not known whether it affects LV chamber function when delivered by inhalation. Methods. Eleven subjects (51 to 69 years old) with normal LV function (mean ejection fraction 72% [range 60% to 80%]) were studied. Four patients had concomitant coronary artery disease. Pressure-volume loop recordings were used to determine end-systolic and end-diastolic pressure-volume and preload recruitable stroke work relations. NO was delivered at 20 ppm for 10 min. In an additional group of patients with normal LV function, PVR (n = 5) and NO metabolites (n = 9) were measured. Results. There was no effect of inhaled NO on steady state LV pressures, volumes, contractility, contraction duration, active relaxation (time constant of relaxation, peak negative first derivative of left ventricular pressure), diastolic compliance or PVR. NO metabolites (methemoglobin and nitrate) were present in the LV cavity at the same concentration as right atrial venous blood, suggesting inactivation of free NO before arrival in the LV chamber. This study had a power of 0.995 to detect a 5% change in contractility (slope of preload recruitable stroke work relation) for alpha = 0.05, based on the multiple linear regression model used. Conclusions. These results indicate that 20 ppm of inhaled NO does not have significant effects on normal LV function. This lack of effect may be due in part to rapid inactivation of free NO in transit to the heart. (J Am Coll Cardiol 1997;30:49–56)" @default.
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• W1596050176 date "1997-07-01" @default.
• W1596050176 modified "2023-09-26" @default.
• W1596050176 title "Effect of Inhaled Nitric Oxide on Normal Human Left Ventricular Function fn1fn1Dr. Hayward is a recipient of a Postgraduate Medical Research Scholarship from the National Health and Medical Research Council of Australia, Canberra, Australia. This work was supported by a Research Project Grant to Dr. Kelly from the National Heart Foundation of Australia, Canberra, Australia." @default.
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• W1596050176 doi "https://doi.org/10.1016/s0735-1097(97)00143-5" @default.
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