OBJECTIVE To determine the feasibility of ultrasound to measure blood flow on patients with chest compression cardiopulmonary resuscitation (CPR), and to find out a real-time, noninvasive hemodynamic evaluation method. METHODS A prospective study was conducted. All adult patients undergoing CPR admitted to Department of Emergency and intensive care unit (ICU) of Zhengzhou People's Hospital from May 2016 to November 2018 were enrolled. The blood flow over the right carotid arteries during chest compressions was recorded with a bedside ultrasound machine. The peak systolic flow velocity (PSV) and end diastolic flow velocity (EDV) of carotid artery were recorded at 1 minute after the start of CPR and 1 minute before the end of CPR. The mean compression frequency during the whole recovery period was recorded, the rate of compression reaching the standard was evaluated by ultrasound (the rate of compression 100-120 times/min was defined as up to standard), and the interruption time of compression was calculated retrospectively according to the ultrasound image data recorded during CPR. RESULTS Thirty-nine patients were enrolled, and 21 patients were successfully rescued, with a successful rate of 53.8%, the time of restoration of spontaneous circulation (ROSC) was (10.9±5.3) minutes. The time from CPR to retrieve an ultrasound image was 1.1-4.9 minutes, with an average of (2.5±1.2) minutes. Satisfactory ultra-sonographic images were obtained in 28 patients during the whole course of chest compression. The acquisition rate was 71.8% (28/39). In the process of compression, if the frequency of compression was less than 100 times/min or the velocity of carotid artery dropped (PSV < 30 cm/s), the chest compressors should be reminded and corrected in time. The PSV at 1 minute after CPR start of 28 patients with satisfactory ultrasound images was (62.9±18.5) cm/s, and the EDV was (13.9±3.5) cm/s, the PSV at 1 minute before the end of CPR was (55.4±18.4) cm/s, and the EDV was (12.9±3.7) cm/s. There was no significant difference in above parameters between the two time points (both P > 0.05), suggesting that satisfactory resuscitation effect was achieved in the whole process of CPR. The compression frequency of 28 patients was 100-149 times/min with an average of (117±47) times/min. The rate of compression with standard was 85.7% (24/28), and the total interruption time of compression accounted for 4.4% of all compression time (25.9 minutes/587.2 minutes). CONCLUSIONS Ultrasound measurement of common carotid artery blood flow during CPR has the advantage of real-time and non-invasive, and it is feasible in clinical work.

中文翻译：

---

胸外按压心肺复苏术中颈动脉多普勒超声血流测量的可行性研究

目的确定超声测量在胸外按压心肺复苏（CPR）患者中的血流量的可行性，并找出一种实时，无创的血流动力学评估方法。方法进行了一项前瞻性研究。纳入了2016年5月至2018年11月在郑州人民医院急诊和重症监护室（ICU）接受CPR的所有成年患者。用床旁超声仪记录胸部受压时右颈动脉的血流量。在CPR开始后1分钟和CPR结束前1分钟记录颈动脉的最高收缩流速（PSV）和舒张末期流速（EDV）。记录整个恢复期间的平均压缩频率，通过超声评估达到标准的压缩率（将压缩率100-120次/分钟定义为达到标准），并根据CPR期间记录的超声图像数据回顾性计算压缩中断时间。结果入选患者39例，抢救成功21例，成功率为53.8％，恢复自发循环时间（ROSC）为（10.9±5.3）分钟。从CPR恢复超声图像的时间为1.1-4.9分钟，平均为（2.5±1.2）分钟。在整个胸部按压过程中，有28例患者获得了满意的超声图像。收购率为71.8％（28/39）。在压缩过程中，如果按压频率低于100次/分钟或颈动脉速度下降（PSV <30 cm / s），应及时提醒并纠正胸部按压。28例具有良好超声图像的患者在心肺复苏开始后1分钟的PSV为（62.9±18.5）cm / s，EDV为（13.9±3.5）cm / s，在心肺复苏结束之前1分钟的PSV为（ 55.4±18.4）cm / s，EDV为（12.9±3.7）cm / s。在两个时间点之间上述参数无显着差异（均P> 0.05），这表明在心肺复苏的整个过程中均获得了令人满意的复苏效果。28例患者的压迫频率为100-149次/分钟，平均（117±47）次/分钟。标准压缩率为85.7％（24/28），压缩的总中断时间为4。所有压缩时间的2％（25.9分钟/587.2分钟）。结论超声测量CPR过程中的颈总动脉血流具有实时性和无创性的优点，在临床工作中是可行的。