Copyright © 1993 by the European Society of Cardiology.
© 1993 The European Society of Cardiology
Haemodynamic and clinical effects of an intravenous potassium channel opener — a review
The Cardiovascular Institute 3-10 Roppongi 7-chome Minato-ku, 106 Tokyo, Japan
Correspondence: K. Kato, MD, The Cardiovascular Institute, 3-10 Roppongi 7-chome Minato-Ku, 106 Tokyo, Japan.
Intravenous nicorandil (4–12 mg) produced a significant decrease in mean arterial blood pressure (– 5 to –15%), systemic vascular resistance (–8 to –27%), pulmonary capillary wedge pressure (–15 to –41%) and left ventricular end-diastolic pressure (–8 to –18%) in patients with coronary artery disease, myocardial infarction or congestive heart failure. Cardiac output was significantly increased (+3 to +19%) in most studies. These haemodynamic effects of intravenous nicorandil (4–8 mg) were comparable to those of nitroglycerin (0.3 mg), although a greater decrease in preload was produced by nitroglycerin. Moreover, no significant haemodynamic tolerance developed over a 12 to 24 h period during continuous infusion of nicorandil (2.4 µg . kg– . min–) in patients with heart failure, in contrast to nitroglycerin infusion (0-65 µg . kg–1 . min–1). Intravenous nicorandil (4–12 mg) was also shown to produce a slightly smaller increase (8–27±) in the diameter of the large coronary arteries compared to that of sublingual nitroglycerin (0.3 mg) (16–32%) and to cause a significant decrease in coronary vascular resistance (–9 to –53%) and a significant increase in coronary sinus flow (+6 to +81–) in patients with coronary artery disease. The efficacy of intravenous nicorandil (2–6 mg . h–1) in unstable angina pectoris has been compared with that of isosorbide dinitrate (2–5 mg . h–1) in a doubleblind, multicentre trial. Over a 3 to 9 day period, nicorandil therapy tended to be more effective in abolishing anginal attacks and decreasing nitroglycerin consumption.
Key Words: Intravenous nicorandil nitroglycerin isosorbide dinitrate tolerance unstable angina