Diurnal, weekly and seasonal rhythm of out of hospital XXXX in Sweden.

@entity1 @entity1167
AIM: To describe the diurnal, weekly and seasonal rhythm among @entity1 suffering from out of hospital @entity1167 in Sweden. METHODS: All @entity1 in Sweden between 1990 and 1999 participating in a National Registry covering 65% of all @entity1 suffering from out of hospital @entity1167 where cardiopulmonary resuscitation (CPR) was attempted. Only @entity1 with a @entity1167 of a cardiac aetiology and aged > 18 years were included in the survey. RESULTS: 10,868 @entity1 fulfilled inclusion criteria. In terms of the diurnal rhythm, there was a progressive increase in the development of @entity1167 from 06:00 h, reaching a peak at about 10:00 h. Thereafter, there was a progressive decline until 05:00 h. The diurnal rhythm was more marked among @entity1 aged > 65 years and among @entity1 in whom the arrest occurred outside home. There was a weekly rhythm with an increased incidence of @entity1167 on Mondays. This was particularly evident among @entity1 aged < 66 years and among @entity1 . A @entity1167 occurred most frequently in January and December. This was particularly observed in the large cities. CONCLUSION: We found that out of hospital @entity1167 of a cardiac etiology has a diurnal, weekly and seasonal rhythm occurring most frequently in the morning hours, on Mondays and in December and January. Age, sex and place of arrest influence these rhythms.
