treated 35 patients who had severe chronic heart failure with a prolonged (48-hour)
intravenous infusion of nitroglycerin (6.4 μg per kilogram of body weight per minute) given
either continuously or intermittently (12-hour infusions separated by intervals of 12 hours).
Intravenous nitroglycerin produced immediate hemodynamic benefits in all patients, but the
magnitude of this improvement was greatly diminished after 48 hours of continuous therapy …