Out of Hospital Sudden Death in a Rural Population: Low Rates of ICD
Underutilization Among Decedents
Abstract
Introduction: The implantable cardioverter defibrillator (ICD) reduces
mortality in patients at risk for potentially life-threatening
arrhythmias. Access and distribution of ICDs in rural or economically
disadvantaged populations is suspected to be low. This study examined
Out of Hospital Premature Natural Death data (OHPND) and electronic
medical record (EMR) data to identify rates of non-implantation of ICDs
in a sample of decedents in eastern North Carolina. Methods and Results:
Death certificate information on 1,316 decedents were matched with EMR
data (N = 967, 73.4%). Chart review identified 70 (7.2%) potential ICD
candidates with a left ventricular ejection fraction (LVEF) ≤35%. Of
the 70 identified patients, 5 (7.1%) did not meet criteria because LVEF
subsequently improved. Of the remaining 65 patients, 32 (49.2%) already
received an ICD or a wearable cardioverter-defibrillator (WCD), and 33
patients (50.7%) met ICD implantation criteria but had not received
one. The reasons identified for non-implantation of ICDs included:
limited life expectancy secondary to comorbidities, principally chronic
kidney disease (CKD) (N=11, 17%), lack of physician adherence to
guidelines (N=9, 14%), lost to follow-up (N=7, 11%), patient refusal
(N=5, 8%), and patients yet to commence guideline-directed medical
therapy (N=1, 2%). Among our cohort of 967 individuals who died
unexpectedly at home, 9 (0.9%) patients may have avoided unexpected
death with an ICD/WCD. Conclusion: This study using decedent data shows
low rates of ICD-underutilization in a rural population, but also
emphasizes the role that advanced comorbidities such as CKD play in
ICD-underutilization.