(Circulation. 2000;101:844.)
© 2000 American Heart Association, Inc.
Brief Rapid Communications |
Maximally Recommended Doses of Angiotensin-Converting Enzyme (ACE) Inhibitors Do Not Completely Prevent ACE-Mediated Formation of Angiotensin II in Chronic Heart Failure
From the Department of Medicine, Division of Cardiology, Albert Einstein College of Medicine, Bronx, NY.
Correspondence to Thierry H. Le Jemtel, MD, Albert Einstein College of Medicine, 1300 Morris Park Ave, Forch, G-42, Bronx, NY 10461. E-mail lejemtel{at}aecom.yu.edu
Background—The added benefits of angiotensin II type I receptor (AT1) blockers (ARBs) to ACE inhibition suggests that recommended doses of ACE inhibitors provide only partial inhibition of ACE in chronic heart failure (CHF). Accordingly, the level of ACE inhibition was assessed by the pressor response to angiotensin (Ang) I in patients who had been treated with recommended doses of ACE inhibitors.
Methods and Results—Forty-two patients with CHF receiving 40 mg/d of a long-acting ACE inhibitor or 150 mg of captopril were studied. Radial artery systolic pressure (RASP, mm Hg) was monitored noninvasively. The pressor response to ascending doses of Ang I was evaluated in all patients before and after administration of the ARB valsartan. The pressor response to Ang I before and after valsartan was also reevaluated in 11 patients after the dose of ACE inhibitor was doubled for 1 week. RASP increased linearly with significantly ascending doses of Ang I despite treatment with ACE inhibitors. The pressor response to Ang I was blunted significantly by valsartan. Ang I–induced increase in RASP did not correlate with duration of ACE inhibitor therapy. After the dose of ACE inhibitors was doubled, the pressor response to Ang I was no longer different from that noted after valsartan.
Conclusions—Recommended doses of ACE inhibitors do not fully inhibit ACE in CHF. The level of ACE inhibition achieved is not related to duration of ACE inhibitor therapy. Greater ACE inhibition is also achieved at twice the recommended doses of ACE inhibitors.
Key Words: angiotensin • heart failure • enzymes
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