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Influence of statin therapy on circadian variation of acute myocardial infarction [Anatol J Cardiol]
Anatol J Cardiol. 2010; 10(5): 429-433 | DOI: 10.5152/akd.2010.141  

Influence of statin therapy on circadian variation of acute myocardial infarction

Doğan Erdoğan1, Mehmet Özaydın2, Yasin Türker3, Mustafa Karabacak4, Ercan Varol5, Abdullah Doğan6
1Department of Cardiology Faculty of Medicine, Süleyman Demirel University, Isparta, Turkey
2Department of Cardiology, Medical School, Suleyman Demirel University, Isparta, Turkey
3Süleyman Demirel Üniversitesi Tıp Fakültesi, Kardiyoloji Ana Bilim Dalı Isparta, Türkiye
4Department of Cardiology, Medical Faculty, Süleyman Demirel University, Isparta
5Department of Cardiology, Isparta State Hospital Süleyman Demirel University, Medical School, Isparta, Turkey
6Department of Cardiology, Faculty of Medicine, Süleyman Demirel University, Isparta

Objective: Strong evidence has suggested that there is a circadian periodicity of acute coronary event. Beta-blockers, aspirin and angiotensin-converting enzyme inhibitors decrease the rate of acute myocardial infarction (AMI) and blunt the peak incidence in the morning. However, such effect has not been evaluated for statins. Accordingly, the present study aimed to evaluate the influence of statin therapy on circadian variation of AMI. Methods: This retrospective study consisted of 451 consecutive patients with acute ST segment elevation AMI. The patients were divided into two group based on prior statin usage. In statistical analysis t test, Chi-square test and Mann Whitney U test were used for comparison of groups. We used harmonic regression models to evaluate the circadian variation of onset of MI symptoms in patients receiving statin and patients not receiving statin. Results: In all study participants, the highest incidence of AMI was between 6.00 and 12.00; the odds ratio was 1.34 (95% CI 1.20 to 1.46, p<0.001). In the non-statin group, the highest incidence of AMI occurred between 0: 00 A.M. and 06.00. There was still a peak incidence between 6.00 A.M. and noon in the statin therapy receiving group; the odds ratio was 1.61 (95% CI 1.34 to 1.80, p<0.001). Accordingly, there was no statistical difference between the statin and non-statin groups regarding circadian variation of AMI. Prior usage of statin did not blunt the peak incidence of AMI in the morning. Conclusion: Prior usage of statin does not seem to play a role in the circadian periodicity of AMI.

Keywords: Acute myocardial infarction, circadian rhythm, statin, regression analysis

Doğan Erdoğan, Mehmet Özaydın, Yasin Türker, Mustafa Karabacak, Ercan Varol, Abdullah Doğan. Influence of statin therapy on circadian variation of acute myocardial infarction. Anatol J Cardiol. 2010; 10(5): 429-433

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