Prevalence of migraine and Raynaud's phenomenon in Japanese patients with vasospastic angina

The prevalence of migraine and Raynaud's phenomenon in Japanese patients wi th vasospastic angina (group I) were compared with those in 2 control group s: one with effort angina (group II) and the other group without known isch emic heart disease (group III). There were no significant differences among the 3 groups with respect to age and sex. The prevalence of migraine in gr oup I was 23 of 100, as compared with 4 of 100 in group II (p<0.01) and 11 of 100 in group III (p<0.05). The prevalence of Raynaud's phenomenon in gro up I was 9 of 100, as compared with 3 of 100 in group II and 4 of 100 in gr oup III. Thus, in Japan, the prevalence of migraine in patients with vasosp astic angina was higher than those in the 2 control groups, whereas the pre valence of Raynaud's phenomenon did not differ significantly among the 3 gr oups. The prevalence of Raynaud's phenomenon in Japanese patients with vaso spastic angina was different from that reported from North America, althoug h the prevalence of migraine was the same. This may be partially explained by racial differences.