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  • Title: Circadian variation of ischemic threshold in patients with chronic stable angina.
    Author: Kishida H, Fukuma N, Saito T.
    Journal: Int J Cardiol; 1992 Apr; 35(1):65-70. PubMed ID: 1563881.
    Abstract:
    Circadian variation of ischemic threshold in chronic stable exertional angina was determined in 51 patients with documented coronary artery disease from the Holter monitor results. The peak favored time zones of ischemic attacks were 8 a.m. and 9 a.m. There was no difference in frequency of ischemic attacks, magnitude of ST-segment depression, or duration of ST-segment depression between the two time zones for ischemic attacks, 6-9 a.m. and 0-3 p.m., but the ischemic threshold was lower in the morning than in the afternoon. These observations suggest that the pathogenesis of ischemic attacks differs from one time zone to the other and is considered helpful in planning therapeutic strategies for myocardial ischemia.
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