From the Department of Cardiology (H.W.), KINU Medical Association
Hospital, Mitsukaido, Ibaraki, Japan; Ibaraki Prefectural University of Health
Science (M.K.), Ami, Ibaraki, Japan; and Cardiovascular Division (S.O., Y.S.),
Department of Internal Medicine, University of Tsukuba, Tsukuba, Ibaraki,
Japan.
Correspondence to Hideki Watanabe, MD, Department of Cardiology, KINU Medical Association Hospital, 13–3 Araigi-cho, Mitsukaido City, Ibaraki 303, Japan. E-mail wata-h{at}xa2.so-net.or.jp
Background—Reduced cGMP
production caused by increased superoxide has been proposed as
a mechanism of nitrate tolerance during continuous nitrate therapy.
This study was designed to evaluate the effects of ascorbate, an
antioxidant, on the development of nitrate tolerance during continuous
nitrate therapy in patients with congestive heart failure.
Methods and Results—Twenty patients with congestive heart failure
were randomized to receive intravenous infusion of
nitroglycerin concomitantly with placebo (placebo
group, n=10) or intravenous ascorbate (vitamin C group,
n=10). After baseline measurements were obtained, dose titration was
started by the infusion of nitroglycerin at a rate of
0.5 µg/kg per minute (titration period). Measurements of
hemodynamic parameters and blood sampling
were performed serially at 0, 6, 12, 18, and 24 hours after the
titration period. At baseline, mean pulmonary artery pressure
(MPAP, mm Hg), mean pulmonary capillary wedge pressure
(PCWP, mm Hg), plasma vitamin E level (µmol/L), and
platelet cGMP level (pmol/109 platelets) were
comparable in the two groups (placebo group: MPAP, 48±6; PCWP, 24±4;
cGMP, 0.76±0.12; vitamin E, 18.2±1.2; vitamin C: MPAP, 49±7; PCWP,
24±4; cGMP, 0.71±0.16; vitamin E, 18.6±1.3). In both groups, at 6
hours after the titration period, MPAP and PCWP were significantly
decreased (placebo group: MPAP, 26±5; PCWP, 15±4; vitamin C: MPAP,
26±4; PCWP, 16±4), and platelet cGMP was significantly increased
(placebo group: 2.42±0.24; vitamin C: 2.26±0.26). However, at 18
hours after titration, in the placebo group, MPAP (44±5) and PCWP
(23±4) were increased, and platelet cGMP (0.85±0.20) and plasma
vitamin E levels (12.4±1.4) were significantly decreased. In contrast,
in the vitamin C group, MPAP (31±6), PCWP (17±5), platelet cGMP
(2.49±0.23), and plasma vitamin E levels (17.6±1.4) were maintained
for 18 hours after the titration period.
Conclusions—These findings indicate that ascorbate, an
antioxidant, may prevent the development of nitrate tolerance during
continuous nitrate therapy in patients with congestive heart failure.
© 1998 American Heart Association, Inc.
Clinical Investigation and Reports
Randomized, Double-Blind, Placebo-Controlled Study of Ascorbate on the Preventive Effect of Nitrate Tolerance in Patients With Congestive Heart Failure
Key Words: antioxidants • heart failure • nitroglycerin • platelets
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