Objective To compare the differences of onset time in old people and middle-youth people with acute ST segment elevation myocardial infarction (STEMI).
Methods From January 2000 and May 2010, 1024 patients with STEMI were investigated for the exact onset time of symptoms. They were classified as the middle-youth group (<65 years, n=536) and the old group (≥65 years, n=488). Based on age, the authors contrast the difference of the onset months, weeks, days between two groups.
Results The peaks of onset of STEMI in middle-youth group were observed in October and February, On Friday, Saturday and Wednesday, at 10:00 and 22:00. And the peaks in the old group were observed in October, January and March, on Friday, Sunday and Monday, at 06:00 and 02:00. The incidences of STEMI in the old group were significant higher than in the middle-youth group in March (11.89%), on Sunday (15.97%) and Monday (17.42%), at 06:00 (6.35%) and 02:00 (5.74%) (p<0.05). However, the rates were significant higher in the middle-youth group in February (9.89%), on Saturday (16.98%), at 20:00 (4.86%) and 22:00. (5.78%) (p<0.05).
Conclusion The discipline of onset timing with STEMI in old people was significantly different than that in the middle -youth people. The onset time of old people had high rate occurrence in seasonal shifts, interchanging of working day with non-working day and in the early morning. The results suggest that the discipline of onset timing with STEMI changes with age.