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Risk factors for sudden unexpected cardiac death in Tasmanian men
P T Sexton1, J Walsh, K Jamrozik
1Department of Emergency Medicine, Royal Hobart Hospital, Tas.
Insights
Sudden unexpected cardiac death (SUCD) in men is linked to diabetes, smoking, and family history of heart disease. These risk factors, though known for heart attacks, also predict SUCD, highlighting potential prevention strategies.
Area of Science:
- Cardiology
- Epidemiology
- Public Health
Background:
- Sudden unexpected cardiac death (SUCD) constitutes a significant portion of deaths from ischemic heart disease (IHD).
- Research into SUCD etiology is challenging, necessitating studies on risk factors.
- Clinical presentation differences between SUCD and fatal myocardial infarction (MI) may indicate distinct underlying causes.
Purpose of the Study:
- To identify and quantify risk factors associated with sudden unexpected cardiac death (SUCD) in a defined male population.
- To establish a case-control study to investigate predictors of SUCD.
Main Methods:
- A population-based case-control study was conducted in Tasmania, Australia, involving 102 men who experienced SUCD and 204 matched controls.
- Data collection involved validated necropsy reports, hospital records, general practitioner information, and spousal/partner questionnaires.
- Multivariate logistic regression analysis was employed to calculate odds ratios (ORs) for various risk factors.
Main Results:
- Independent risk factors for SUCD included a history of diabetes mellitus (OR = 4.2), current smoking status (OR = 3.5), and a family history of IHD (OR = 2.6).
- Other assessed factors like treated hypertension, hypercholesterolemia, and alcohol intake did not independently predict SUCD in this cohort.
- The findings confirm that established cardiovascular risk factors also contribute to SUCD.
Conclusions:
- Certain risk factors for acute myocardial infarction (AMI) are also predictive of SUCD in men without prior coronary disease.
- Public health initiatives aimed at reducing smoking, managing diabetes mellitus, and controlling blood pressure are crucial for SUCD prevention.
- While SUCD is untreatable by definition, proactive management of identified risk factors offers potential for avoidance.
Background:
Sudden unexpected cardiac death (SUCD) accounts for approximately 25% of deaths from ischaemic heart disease (IHD) but is relatively poorly understood because of the difficulties involved in researching aetiology. Clinical differences between instances of SUCD and those cases of acute chest pain that survive long enough to be proven as myocardial infarction but are eventually fatal might reflect differences in aetiology.
Aims:
To determine the risk factors for sudden unexpected cardiac death in Tasmanian men.
Methods:
A population-based case-control method was used with the study population, an estimated 125,225 men aged 25-74 years living in the island State of Tasmania, Australia. The case group of 102 men who had a SUCD was validated using necropsy reports, hospital records and information provided by the usual general practitioner. Cases were matched with 204 community controls. Spouses or partners of eligible subjects answered a detailed questionnaire. Multi-variate odds ratios (ORs) for risk factors were calculated using stepwise analysis.
Results:
Risk factors measured included: smoking habit, treated hypertension, hypercholesterolaemia, diabetes mellitus, family history of IHD, alcohol intake and exercise habits. Independent risk factors for SUCD were: history of diabetes mellitus (OR = 4.2, 95% CI: 1.39, 12.81), current smoking status (OR = 3.5, 95% CI: 1.80, 6.82), and family history of IHD (OR = 2.6, 95% CI: 1.34, 4.92).
Conclusions:
Some accepted risk factors for acute myocardial infarction (AMI) also predict sudden death in men with no history of coronary disease. Efforts to reduce smoking, the incidence of diabetes mellitus and mean blood pressure must be continued as SUCD is, by definition, untreatable but is potentially avoidable in many instances.