Emergency medicine updates: Managing the patient with return of spontaneous circulation.

INTRODUCTION

Patients with return of spontaneous circulation (ROSC) following cardiac arrest are a critically important population requiring close monitoring and targeted interventions in the emergency department (ED). Therefore, it is important for emergency clinicians to be aware of the current evidence regarding the management of this condition.

OBJECTIVE

This paper provides evidence-based updates concerning the management of the post-ROSC patient.

DISCUSSION

The patient with ROSC following cardiac arrest is critically ill, including a post-cardiac arrest syndrome which may include hypoxic brain injury, myocardial dysfunction, systemic ischemia and reperfusion injury, and persistent precipitating pathophysiology. Initial priorities in the ED setting in the post-ROSC patient include supporting cardiopulmonary function, addressing and managing the underlying cause of arrest, minimizing secondary cerebral injury, and correcting physiologic derangements. Testing including laboratory assessment, electrocardiogram (ECG), and imaging are necessary, aiming to evaluate for the precipitating cause and assess end-organ injury. Computed tomography head-to-pelvis may be helpful in the post-ROSC patient, particularly when the etiology of arrest is unclear. There are several important components of management, including targeting a mean arterial pressure of at least 65 mmHg, preferably >80 mmHg, to improve end-organ and cerebral perfusion pressure. An oxygenation target of 92-98 % is recommended using ARDSnet protocol, along with carbon dioxide partial pressure values of 35-55 mmHg. Antibiotics should be reserved for those with evidence of infection but may be considered if the patient is comatose, intubated, and undergoing hypothermic targeted temperature management (TTM). Corticosteroids should not be routinely administered. While the majority of cardiac arrests in adults are associated with cardiovascular disease, not all post-ROSC patients require emergent coronary angiography. However, if the patient has ST-segment elevation on ECG following ROSC, emergent angiography and catheterization is recommended. This should also be considered if the patient had an initial history concerning for acute coronary syndrome or a presenting arrhythmia of ventricular fibrillation or pulseless ventricular tachycardia. TTM at 32-34° C does not appear to demonstrate improved outcomes compared with targeted normothermia, but fever should be avoided.

CONCLUSIONS

An understanding of literature updates can improve the ED care of patients post-ROSC.