Seasonal pattern in admissions and mortality from acute myocardial infarction in elderly patients in Isfahan, Iran

. 2014 Jan;10(1):46-54.

Seasonal pattern in admissions and mortality from acute myocardial infarction in elderly patients in Isfahan, Iran

Abdollah Mohammadian-Hafshejani¹, Nizal Sarrafzadegan², Shidokht Hosseini³, Hamid Reza Baradaran⁴, Hamidreza Roohafza⁵, Masoumeh Sadeghi⁶, Mohsen Asadi-Lari⁷

Affiliations

¹ Deputy of Health, Isfahan University of Medical Sciences, Isfahan AND PhD Candidates, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
² Professor, Isfahan Cardiovascular Research Center, Isfahan Cardiovascular Research Institute, Isfahan University of Medical Sciences, Isfahan, Iran.
³ Researcher, Hypertension Research Center, Isfahan Cardiovascular Research Institute, Isfahan University of Medical Sciences, Isfahan, Iran.
⁴ Associate Professor, Endocrine Research Center, Institute of Endocrinology and Metabolism, Iran University of Medical Sciences, Tehran, Iran.
⁵ Assistant Professor, Cardiac Rehabilitation Research Center, Isfahan Cardiovascular Research Institute, Isfahan University of Medical Sciences, Isfahan, Iran.
⁶ Associate Professor, Cardiac Rehabilitation Research Center, Isfahan Cardiovascular Research Institute, Isfahan University of Medical Sciences, Isfahan, Iran.
⁷ Associate Professor, Department of Epidemiology, School of Health AND Oncopathology Research Center, Iran University of Medical Sciences, Tehran, Iran.

PMID: 24963314
PMCID: PMC4063513

Seasonal pattern in admissions and mortality from acute myocardial infarction in elderly patients in Isfahan, Iran

Abdollah Mohammadian-Hafshejani et al. ARYA Atheroscler. 2014 Jan.

. 2014 Jan;10(1):46-54.

Authors

Abdollah Mohammadian-Hafshejani¹, Nizal Sarrafzadegan², Shidokht Hosseini³, Hamid Reza Baradaran⁴, Hamidreza Roohafza⁵, Masoumeh Sadeghi⁶, Mohsen Asadi-Lari⁷

Affiliations

¹ Deputy of Health, Isfahan University of Medical Sciences, Isfahan AND PhD Candidates, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
² Professor, Isfahan Cardiovascular Research Center, Isfahan Cardiovascular Research Institute, Isfahan University of Medical Sciences, Isfahan, Iran.
³ Researcher, Hypertension Research Center, Isfahan Cardiovascular Research Institute, Isfahan University of Medical Sciences, Isfahan, Iran.
⁴ Associate Professor, Endocrine Research Center, Institute of Endocrinology and Metabolism, Iran University of Medical Sciences, Tehran, Iran.
⁵ Assistant Professor, Cardiac Rehabilitation Research Center, Isfahan Cardiovascular Research Institute, Isfahan University of Medical Sciences, Isfahan, Iran.
⁶ Associate Professor, Cardiac Rehabilitation Research Center, Isfahan Cardiovascular Research Institute, Isfahan University of Medical Sciences, Isfahan, Iran.
⁷ Associate Professor, Department of Epidemiology, School of Health AND Oncopathology Research Center, Iran University of Medical Sciences, Tehran, Iran.

PMID: 24963314
PMCID: PMC4063513

Abstract

Background: Seasonal variation in admissions and mortality due to acute myocardial infarction has been observed in different countries. Since there are scarce reports about this variation in Iran, this study was carried out to determine the existence of seasonal rhythms in hospital admissions for acute myocardial infarction, and in mortality due to acute myocardial infarction (AMI) in elderly patients in Isfahan city.

Methods: This prospective hospital-based study included a total of 3990 consecutive patients with acute myocardial infarction admitted to 13 hospitals from January 2002 to December 2007. Seasonal variations were analyzed with the Kaplan-Meier table, log rank test, and Cox regression model.

Results: There was a statistically significant relationship between the occurrence of heart disease based on season and type of acute myocardial infarction anatomical (P < 0.001). The relationship between the occurrence of death and season and type of AMI according to International Classification of Diseases code 10 (ICD) was also observed and it was statistically significant (P = 0.026). Hazard ratio for death from acute myocardial infarction were 0.96 [Confidence interval of 95% (95% CI) = 0.78-1.18], 0.9 (95%CI = 0.73-1.11), and 1.04 (95%CI = 0.85-1.26) during spring, summer, and winter, respectively.

Conclusion: There is seasonal variation in hospital admission and mortality due to AMI; however, after adjusting in the model only gender and age were significant predictor factors.

Keywords: Acute Myocardial Infarction; Admission in Hospital; Isfahan; Mortality; Season.

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Figures

**Figure 1**
Bar error diagram for mean follow up time for death and all patients with AMI according to season AMI: Acute myocardial infarction; CI: Confidence interval

**Figure 2**
28 day survival in patients with acute myocardial infarction according to season

See this image and copyright information in PMC

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References

1. Talaei M, Sarrafzadegan N, Sadeghi M, Oveisgharan S, Marshall T, Thomas GN, et al. Incidence of cardiovascular diseases in an Iranian population: the Isfahan Cohort Study. Arch Iran Med. 2013;16(3):138–44. - PubMed
1. Naghavi M, Abolhassani F, Pourmalek F, Lakeh M, Jafari N, Vaseghi S, et al. The burden of disease and injury in Iran 2003. Popul Health Metr. 2009; 7:9. - PMC - PubMed
1. Tunstall-Pedoe H, Kuulasmaa K, Amouyel P, Arveiler D, Rajakangas AM, Pajak A. Myocardial infarction and coronary deaths in the World Health Organization MONICA Project. Registration procedures, event rates, and case-fatality rates in 38 populations from 21 countries in four continents. Circulation. 1994;90(1):583–612. - PubMed
1. Volmink JA, Newton JN, Hicks NR, Sleight P, Fowler GH, Neil HA. Coronary event and case fatality rates in an English population: results of the Oxford myocardial infarction incidence study. The Oxford Myocardial Infarction Incidence Study Group. Heart. 1998;80(1):40–4. - PMC - PubMed
1. Norris RM. Fatality outside hospital from acute coronary events in three British health districts, 1994-5. United Kingdom Heart Attack Study Collaborative Group. BMJ. 1998;316(7137):1065–70. - PMC - PubMed

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[1] Talaei M, Sarrafzadegan N, Sadeghi M, Oveisgharan S, Marshall T, Thomas GN, et al. Incidence of cardiovascular diseases in an Iranian population: the Isfahan Cohort Study. Arch Iran Med. 2013;16(3):138–44. - PubMed

[2] Talaei M, Sarrafzadegan N, Sadeghi M, Oveisgharan S, Marshall T, Thomas GN, et al. Incidence of cardiovascular diseases in an Iranian population: the Isfahan Cohort Study. Arch Iran Med. 2013;16(3):138–44. - PubMed

[3] Naghavi M, Abolhassani F, Pourmalek F, Lakeh M, Jafari N, Vaseghi S, et al. The burden of disease and injury in Iran 2003. Popul Health Metr. 2009; 7:9. - PMC - PubMed

[4] Naghavi M, Abolhassani F, Pourmalek F, Lakeh M, Jafari N, Vaseghi S, et al. The burden of disease and injury in Iran 2003. Popul Health Metr. 2009; 7:9. - PMC - PubMed

[5] Tunstall-Pedoe H, Kuulasmaa K, Amouyel P, Arveiler D, Rajakangas AM, Pajak A. Myocardial infarction and coronary deaths in the World Health Organization MONICA Project. Registration procedures, event rates, and case-fatality rates in 38 populations from 21 countries in four continents. Circulation. 1994;90(1):583–612. - PubMed

[6] Tunstall-Pedoe H, Kuulasmaa K, Amouyel P, Arveiler D, Rajakangas AM, Pajak A. Myocardial infarction and coronary deaths in the World Health Organization MONICA Project. Registration procedures, event rates, and case-fatality rates in 38 populations from 21 countries in four continents. Circulation. 1994;90(1):583–612. - PubMed

[7] Volmink JA, Newton JN, Hicks NR, Sleight P, Fowler GH, Neil HA. Coronary event and case fatality rates in an English population: results of the Oxford myocardial infarction incidence study. The Oxford Myocardial Infarction Incidence Study Group. Heart. 1998;80(1):40–4. - PMC - PubMed

[8] Volmink JA, Newton JN, Hicks NR, Sleight P, Fowler GH, Neil HA. Coronary event and case fatality rates in an English population: results of the Oxford myocardial infarction incidence study. The Oxford Myocardial Infarction Incidence Study Group. Heart. 1998;80(1):40–4. - PMC - PubMed

[9] Norris RM. Fatality outside hospital from acute coronary events in three British health districts, 1994-5. United Kingdom Heart Attack Study Collaborative Group. BMJ. 1998;316(7137):1065–70. - PMC - PubMed

[10] Norris RM. Fatality outside hospital from acute coronary events in three British health districts, 1994-5. United Kingdom Heart Attack Study Collaborative Group. BMJ. 1998;316(7137):1065–70. - PMC - PubMed

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Seasonal pattern in admissions and mortality from acute myocardial infarction in elderly patients in Isfahan, Iran

Affiliations

Seasonal pattern in admissions and mortality from acute myocardial infarction in elderly patients in Isfahan, Iran

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