Unresponsive congestive heart failure, including that secondary to acute myocardial infarction; acute left-sided heart failure and acute myocardial infarction.
Refractory unstable angina pectoris and coronary insufficiency, including Prinzmetal's angina.
Control of hypertensive episodes and/or myocardial ischemia during and after cardiac surgery.
Induction of controlled hypotension for surgery.