The efficacy of ultrasound (US) in real-time differential diagnosis and guiding further treatment decisions has been well demonstrated in prearrest conditions and during resuscitation. Evidence is limited regarding the application of US in postresuscitation care. Most of the patients following resuscitation remain comatose, and the requirement for transportation to other examination rooms increases their risk of injury. US can be performed at the bedside with high accessibility and timeliness without radiation. This narrative review provides an overview of current evidence regarding the application of US in identifying the cause of cardiac arrest (CA), hemodynamic monitoring, and prognostication in postresuscitation care. For identifying the cause of CA, cardiac US is mainly used to detect regional wall motion abnormality. However, postarrest myocardial dysfunction would confound the sonographic findings that a combination of electrocardiograms and biomarkers besides the cardiac US could improve the positive predictive value of coronary artery disease. For hemodynamic monitoring, left ventricular outlet tract velocity time integral has the best performance in predicting fluid responsiveness in conjunction with the passive leg raising test. The RUSH protocol assists in determining the subtypes of shock with high sensitivity and specificity in hypovolemic, cardiogenic, or obstructive shock. Evidence regarding the application of US for prognostication is still limited, and further evaluation should be needed.

超声波的功效(US) 在实时鉴别诊断和指导进一步治疗决策方面的作用已在逮捕前情况和复苏期间得到充分证明。关于超声在复苏后护理中应用的证据有限。大多数复苏后的患者仍处于昏迷状态，需要转运到其他检查室会增加他们受伤的风险。US 可以在床边进行，具有很高的可及性和及时性，没有辐射。这篇叙述性综述概述了有关超声在确定心脏骤停 (CA) 原因、血流动力学监测和复苏后护理预后方面的应用的当前证据。为了确定CA的原因，心脏超声主要用于检测局部室壁运动异常。然而，心脏骤停后心肌功能障碍会混淆超声检查结果，即心电图和除心脏超声之外的生物标志物的组合可以提高冠状动脉疾病的阳性预测值。对于血流动力学监测，左心室出口道速度时间积分结合被动抬腿试验在预测液体反应性方面具有最佳性能。RUSH 协议有助于确定休克的亚型，在低血容量性休克、心源性休克或阻塞性休克中具有高灵敏度和特异性。关于应用超声预测预后的证据仍然有限，需要进一步评估。