BACKGROUND: Older age is associated with worse outcome after out-of-hospital 
cardiac arrest (OHCA). Therefore, we tested the performance of CAHP score, to 
predict neurological outcome in elderly OHCA patients and to select patients 
most likely to benefit from coronary angiogram (CAG).
MATERIALS AND METHODS: The present study was a retrospective multicentre 
observational study at 3 non-university hospitals and 1 university hospital. 
CAHP score was calculated, and its performance to predict outcomes was 
evaluated. Factors associated with the use of CAG were analysed and the rate of 
CAG across each CAHP score risk group reported.
RESULTS: One hundred seventy-six patients fulfilled inclusion criteria (median 
age of 81, [79-84]), among which a cardiac cause was presumed for 99 patients. 
The hospital unfavourable outcome was 91%. The ROC-AUC values for hospital 
neurological outcome prediction of CAHP score was 0.81 [0.68-0.94], showing good 
discrimination performance. ST-segment elevation in ECG and initial shockable 
rhythm were independent factors for performing early CAG, whereas age and 
distance from the percutaneous coronary intervention centre were independently 
associated with the absence of early CAG. The percentages of patients receiving 
early CAG in the low, medium and high CAHP score risk groups were 64%, 33% and 
34%, respectively, and differed significantly between low CAHP score risk group 
and other groups (p = 0.02).
CONCLUSIONS: The CAHP score exhibited a good discrimination performance to 
predict neurological outcome in elderly OHCA patients. This score could 
represent a helpful tool for treatment allocation. A simple prognostication 
score could permit avoiding unnecessary procedures in patients with minimal 
chances of survival.