Abstract 17243: Seasonal Variation of Ventricular Tachycardia and Ventricular Fibrillation
Background: Ventricular tachycardia (VT) and Ventricular fibrillation (VF) are the most common causes of sudden cardiac death in the US, with approximately 300, 000 deaths per year. Studies have shown seasonal variation in incidence of sudden cardiac death and cardiac arrest. We studied a large national hospitalization database to assess seasonal variation in the incidence of VT and VF from 2000-2012.
Methods: We used the Nationwide Inpatient Sample (NIS) database to determine estimate of annual number of hospitalisation from 2000-2012 with principal discharge diagnosis of VT/VF. ICD-9 diagnosis codes 427.1 and 427.41 were used to identify hospitalization for VT and VF, respectively. The frequency of hospitalization for these diagnoses of each month cumulative over 12 years was calculated and divided by number of days in that month to obtain the mean hospitalizations per day for each month. All calculations were carried out using the weighted estimates approximating nationwide population estimates.
Results: An estimated 6, 71,633 hospitalizations with primary diagnosis of VT and 109,739 with VF occurred in the US from 2000 to 2012. Figure 1 shows the number of hospitalization per day, stratified by season. The number of hospitalizations was highest for VT and VF in winter and spring; this decreased dramatically in summer and fall. The mean number of hospitalizations per day was highest from January to March for VT (1,872 per day) and from April to June for VF (310 per day). Rates for both diagnoses were lowest from October to December (VT: 1,807 per day; VF: 293 per day).
Conclusions: We observed an impressive pattern of seasonal variation in hospital admissions for VT and VF in the US. Further studies may be needed to determine the relationship of these variations in association to geographical distribution, environmental factors or change in physical activity and determine preventive strategies to reduce the burden of disease in health care system.
Author Disclosures: M. Pahuja: None. R.G. Soni: None. N. Shah: None. N. Bhatia: None. S. Agrawal: None. A. Handa: None. D. Patel: None. S.A. Kamdar: None. N. Hussain: None. A. Kalya: None.
- © 2016 by American Heart Association, Inc.