Clot in Transit in a Patient with COVID-19: Transesophageal Echocardiographic Guidance of Mechanical Cardiopulmonary Resuscitation.
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ABSTRACT:
SUBMITTER: Horowitz JM
PROVIDER: S-EPMC7816862 | biostudies-literature |
REPOSITORIES: biostudies-literature
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Project description:There has been no report about aortic dissection due to cardiopulmonary resuscitation (CPR). We present here a case of acute aortic dissection as a rare complication of CPR and propose the potential mechanism of injury on the basis of transesophageal echocardiographic observations. A 54-year-old man presented with cardiac arrest after choking and received 19 minutes of CPR in the emergency department. Transesophageal echocardiography (TEE) during CPR revealed a focal separation of the intimal layer at the descending thoracic aorta without evidence of aortic dissection. After restoration of spontaneous circulation, hemorrhagic cardiac tamponade developed. Follow-up TEE to investigate the cause of cardiac tamponade revealed aortic dissection of the descending thoracic aorta. Hemorrhagic cardiac tamponade was thought to be caused by myocardial hemorrhage from CPR.
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Project description:Feedback on chest compressions and ventilations during cardiopulmonary resuscitation (CPR) is important to improve survival from out-of-hospital cardiac arrest (OHCA). The thoracic impedance signal acquired by monitor-defibrillators during treatment can be used to provide feedback on ventilations, but chest compression components prevent accurate detection of ventilations. This study introduces the first method for accurate ventilation detection using the impedance while chest compressions are concurrently delivered by a mechanical CPR device. A total of 423 OHCA patients treated with mechanical CPR were included, 761 analysis intervals were selected which in total comprised 5 884 minutes and contained 34 864 ventilations. Ground truth ventilations were determined using the expired CO 2 channel. The method uses adaptive signal processing to obtain the impedance ventilation waveform. Then, 14 features were calculated from the ventilation waveform and fed to a random forest (RF) classifier to discriminate false positive detections from actual ventilations. The RF feature importance was used to determine the best feature subset for the classifier. The method was trained and tested using stratified 10-fold cross validation (CV) partitions. The training/test process was repeated 20 times to statistically characterize the results. The best ventilation detector had a median (interdecile range, IDR) F 1-score of 96.32 (96.26-96.37). When used to provide feedback in 1-min intervals, the median (IDR) error and relative error in ventilation rate were 0.002 (-0.334-0.572) min-1 and 0.05 (-3.71-9.08)%, respectively. An accurate ventilation detector during mechanical CPR was demonstrated. The algorithm could be introduced in current equipment for feedback on ventilation rate and quality, and it could contribute to improve OHCA survival rates.
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Project description:Several auditory-based feedback devices have been developed to improve the quality of ventilation performance during cardiopulmonary resuscitation (CPR), but their effectiveness has not been proven in actual CPR situations. In the present study, we investigated the effectiveness of visual flashlight guidance in maintaining high-quality ventilation performance. We conducted a simulation-based, randomized, parallel trial including 121 senior medical students. All participants were randomized to perform ventilation during 2 minutes of CPR with or without flashlight guidance. For each participant, we measured mean ventilation rate as a primary outcome and ventilation volume, inspiration velocity, and ventilation interval as secondary outcomes using a computerized device system. Mean ventilation rate did not significantly differ between flashlight guidance and control groups (P = 0.159), but participants in the flashlight guidance group exhibited significantly less variation in ventilation rate than participants in the control group (P<0.001). Ventilation interval was also more regular among participants in the flashlight guidance group. Our results demonstrate that flashlight guidance is effective in maintaining a constant ventilation rate and interval. If confirmed by further studies in clinical practice, flashlight guidance could be expected to improve the quality of ventilation performed during CPR.
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