Does angina vary with the menstrual cycle in women with premenopausal coronary artery disease?

Objective-To determine whether angina in women with established coronary he art disease varies with changes in hormone concentrations during the menstr ual cycle. Design-Subjects were prospectively studied once a week for four weeks. Setting-Cardiology outpatient department of tertiary referral centre. Subjects-Nine premenopausal women, mean (SEM) age 38.89 (2.18) years, with established coronary heart disease, symptomatic angina, and a positive exer cise test. Main outcome measure-Myocardial ischaemia as determined by time to 1 mm ST depression during symptom limited exercise testing. Position in the menstru al cycle was established from hormone concentrations. Results-The early follicular phase, when oestradiol and progesterone concen trations were both low, was associated with the worst exercise performance in terms of time to onset of myocardial ischaemia, at 290 (79) seconds; the best performance (418 (71) seconds) was when oestrogen concentrations were highest in the mid-cycle (p < 0.05). Similar trends were observed in other measured variables. Progesterone concentrations did not influence exercise performance. Conclusions-During the menstrual cycle myocardial ischaemia was more easily induced when oestrogen concentrations were low. This may be important for timing the assessment: and evaluating treatment in women with coronary hear t disease.