Methemoglobin levels produced by organic nitrates in patients with coronary artery disease.

Abstract:

:To determine if ordinary doses of nitrates produce a significant increase in methemoglobin, methemoglobin levels were measured in 59 randomly selected patients with coronary artery disease and unstable angina pectoris who were receiving organic nitrate therapy. Patients were taking isosorbide dinitrate, 2% nitroglycerin ointment, or a combination of the two. Patients were subdivided according to whether they were using one (group A) or more than one (group B) organic nitrate preparations. These results were compared with 17 control patients. Mean methemoglobin levels in group B were 1.78 +/- 1.29%, and this differed significantly (P less than 0.05) from both group A mean methemoglobin, 1.13 +/- 0.92%, and controls, 0.99 +/- 0.55%. The proportion of patients with elevated methemoglobin concentration increased from the control to group A to group B. It is concluded that commonly used dosages of nitrates are capable of causing elevations of methemoglobin which are probably not of routine clinical significance. However, these elevations may be of import in certain patient populations such as those with coronary insufficiency or anemia.

journal_name

J Clin Pharmacol

authors

Arsura E,Lichstein E,Guadagnino V,Nicchi V,Sanders M,Hollander G,Greengart A

doi

10.1002/j.1552-4604.1984.tb01825.x

subject

Has Abstract

pub_date

1984-04-01 00:00:00

pages

160-4

issue

4

eissn

0091-2700

issn

1552-4604

journal_volume

24

pub_type

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