Population Density and Survival Rates in Cardiac Arrest Cases
Author Information
Author(s): Yasunaga Hideo, Miyata Hiroaki, Horiguchi Hiromasa, Tanabe Seizan, Akahane Manabu, Ogawa Toshio, Koike Soichi, Imamura Tomoaki
Primary Institution: Department of Health Management and Policy, Graduate School of Medicine, The University of Tokyo
Hypothesis
The study investigates the relationship between population density, call-response interval, and survival of out-of-hospital cardiac arrest (OHCA).
Conclusion
Living in a low-density area was associated with a higher risk of delayed ambulance response and lower survival rates in cases of OHCA.
Supporting Evidence
- 1-month survival was 7.8% and neurologically favorable survival was 3.6%.
- In very low-density areas, the mean call-response interval was 9.3 minutes.
- Patients in very high-density areas had a significantly higher survival rate (OR, 1.64).
- The proportion of elderly people in neighborhoods was associated with lower survival rates.
Takeaway
If you live in a crowded city, you're more likely to survive a heart attack than if you live in a quiet, rural area because help gets to you faster.
Methodology
The study analyzed data from 101,287 bystander-witnessed OHCA patients who received EMS in Japan between 2005 and 2007, using logistic regression to assess survival outcomes.
Potential Biases
Potential biases may arise from the registry-based nature of the study and the arbitrary categorization of population density groups.
Limitations
The study's data may not be generalizable to other countries due to unique geographic characteristics of Japan, and it lacked detailed data on patient comorbidities.
Participant Demographics
The average age of patients was 73.2 years, with a significant proportion being elderly (≥65 years) in low-density areas.
Statistical Information
P-Value
p<0.001
Confidence Interval
95% CI: 1.44 - 1.87
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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