Abstract 148: No Bystander Cardiopulmonary Resuscitation For Out-Of-Hospital Cardiac Arrest In Vietnam: Impact On The Outcomes

Introduction: Bystander CPR is not often performed on OHCA patients, particularly in limited-resource regions. This study aimed to investigate the rate of OHCA patients who did not receive bystander CPR and its impact on the outcomes in an LMIC. Hypothesis: Understanding the reasons bystanders are reluctant to call EMS and how no bystander CPR impacts the outcomes of OHCA patients are crucial for improving survival in Vietnam. Methods: We performed a multicenter prospective cohort study of OHCA patients (≥18 years) presenting to three central hospitals in Vietnam from February 2014 to December 2018. We collected data on characteristics, management, and outcomes and compared these data between patients who did not receive bystander CPR and patients who did. Using logistic regression, we assessed factors associated with survival and good neurological function on discharge (a CPC score of 1 or 2). Results: Of 521 patients, 388 (74.5%) were male, and the mean age was 56.71 years (SD: 17.32). Although most cardiac arrests (68.7%; 358/521) occurred at home and 67.9% (353/520) were witnessed by bystanders, a high rate (77.9%, 406/521) of these patients did not receive bystander CPR. Only half of the patients were taken by EMS (8.1%, 42/521) or private ambulance (42.8%, 223/521); 50.8% (133/262) of whom were given resuscitation attempts by EMS or private ambulance. There was no significant difference in survival to admission (16.7%; 68/406 and 24.3%; 28/115; p=0.064) and survival to discharge (7.9%; 32/406 and 14.8%; 17/115; p=0.094) between patients who did not receive bystander CPR and patients who did. In contrast, the rate of good neurological function of patients who did not receive bystander CPR (4.7%, 19/406) was significantly lower than that of patients who received bystander CPR (12.2%, 14/115; p=0.004). Moreover, multivariate analysis showed that no bystander CPR (OR: 0.276; 95% CI: 0.124-0.614) was inversely and independently associated with good neurological function. Conclusions: In our study, poor outcomes emphasize the need for increasing bystander CPR performance, increasing the number of EMS ambulances and the utilization of private ambulances, and developing a standard emergency first-aid program for both healthcare personnel and the community.