Objective Our objective was to assess the relations between apparent temperature and incidence of acute coronary syndrome (ACS) in Rasht, Iran.
Methods We used a time-series analysis to investigate the relationship between apparent temperature and hospital admission from 2005 to 2014. Distributed lag non-linear models were used to estimate the association between ACS hospitalisation and apparent temperature. To examine the high-temperature effect on ACS hospital admission, the relative risk of ACS hospital admission associated with high temperature, the 99th percentile of temperature (34.7°C) compared with the 75th percentile of temperature (26.9°C), was calculated. To assess the cold effect on ACS hospital admission, the relative risk of ACS hospital admission associated with cold temperature, the first percentile of temperature (−0.2°C) compared with the 25th percentile of temperature (8.2°C), was evaluated.
Results The cumulative effect of hot exposure on ACS admissions was statistically significant, with a relative risk of 2.04 (95% CI 1.06 to 4.16). The cumulative effect of cold temperature on ACS admissions was found to be non-significant. The highest risk of ACS admission in women was in 38°C (RR, 2.03, 95% CI 1.04 to 4.18). The effect of hot temperature on ACS admission occurred immediately (lag 0) (RR, 1.09, 95% CI 1.001 to 1.19).
Conclusions The high apparent temperature is correlated with a higher ACS admission especially on the same day. These findings may have implications for developing intervention strategies to reduce and prevent temperature-related morbidity especially in the elderly.
- coronary artery disease
- acute coronary syndrome
- public health
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Present affiliation The present affiliation of Mohammad Taghi Moghadamnia is: Department of Medical - Surgical Nursing, Guilan University of Medical Sciences, Guilan, Rasht, Iran
Present affiliation The present affiliation of Ali Ardalan is: Harvard Humanitarian Initiative, Harvard University, Massachusetts, cambridge, United States
Contributors All authors of the manuscript certify that they had the same contribution in writing the manuscript. MTM: developing and planning the research idea and preparing the final manuscript. AA: supervision and responsibility for the organisation. AM: responsibility for conducting a literature search. KN: conduct and reporting of the work. MSY: analysis of data and preparing the primary draft on outputs.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient consent Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
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