January 1, 1978Open Access
View Full PaperNifedipine therapy for Prinzmetal's angina.
Key Result
Nifedipine was effective in relieving attacks of Prinzmetal's angina unresponsive to conventional therapy, though lower doses lost effectiveness approximately 4 hours after administration.
Study Design
Type
Case Report (n=1)
Structured PICO
Does nifedipine relieve attacks in a patient with Prinzmetal's angina unresponsive to conventional therapy?
P
Population
1 patient with Prinzmetal's angina unresponsive to conventional therapy.
I
Intervention
Nifedipine
O
Outcome
Relief of anginal attackspatient reported
Nifedipine is effective in relieving Prinzmetal's angina attacks, but concurrent nitrate withdrawal may precipitate myocardial infarction.
Abstract
A case is described in which nifedipine, a new coronary vasodilator, was effective in relieving attacks of Prinzmetal's angina unresponsive to conventional therapy. The extreme frequency of the anginal attacks provided evidence that lower doses of nifedipine lost their effectiveness approximately 4 hours after administration. A month after initiation of nifedipine, nitrates were withdrawn since they had been ineffective in controlling the attacks. A myocardial infarction occurred immediately, presumably due to coronary spasm.