Cardiac arrest is a clinical entity that is frequently found in emergency services and critically ill units, with cardiopulmonary resuscitation (CPR) techniques being an integral part of the core training of each emergency medical provider. The use of focused cardiac ultrasound (FoCUS) is a cost-effective adjunctive tool for the management of CPR in the hospital environment. The literature supports its value as a prognostic examination of negative survival in the absence of spontaneous cardiac movements, asystole and true pulseless electrical activity (PEA). In addition, it includes a positive prognostic factor for recovery from spontaneous circulation (ROSC) and hospital survival in pseudo-PEA. The FoCUS will allow the limited and early diagnosis of reversible causes of PCR in non-defibrillable rhythms and, subsequently, guide and evaluate the therapeutic measures used during CPR. Serial evaluation by echocardiography after ROSC can guide treatment and establish prognosis in these patients. RESUMENEl Paro Cardiorrespiratorio (PCR) es una entidad clínica que se encuentra con frecuencia en los servicios de urgencia y unidades de paciente crítico siendo las técnicas de reanimación cardiopulmonar (RCP) una parte integral de la capacitación central de cada proveedor de atención médica de emergencia. El uso de ecocardiografía focalizada (FoCUS) es una herramienta coadyuvante costo-efectiva para el manejo de PCR en el ambiente hospitalario. La literatura avala su valor como examen pronóstico de sobrevida negativo ante ausencia