Non-invasive device for synchronizing chest compression and ventilation parameters to residual myocardial activity during cardiopulmonary resuscitation

摘要

A method for improving the cardiac output of a patient who is suffering from pulseless electrical activity or shock and yet still displays some myocardial wall motion including sensing myocardial activity to determine the presence of residual left ventricular pump function having a contraction or ejection phase and a filling or relaxation phase. In such cases, a compressive force is repeatedly applied to the chest based on the sensed myocardial activity such that the compressive force is applied during at least some of the ejection phases and is ceased during at least some of the relaxation phases to permit residual cardiac filling, thereby enhancing cardiac output and organ perfusion. Also incorporated may be a logic circuit capable of utilizing multiple sensing modalities and optimizing the synchronization pattern between multiple phasic therapeutic modalities and myocardial residual mechanical function.

主权项

1. A method to treat a patient in shock comprising:
determining the patient is in a pulseless electrical activity (PEA) condition; during the PEA condition, sensing actual residual myocardial motion or residual pulsatile blood flow in the patient using one or more sensors for any of echocardiography, Doppler ultrasonography, plethysmography and phonocardiography, determining whether actual myocardial motion or residual pulsatile blood flow is occurring in the patient during the PEA condition, and in response to the determination that the actual myocardial motion or residual pulsatile blood flow is occurring, repeatedly applying a phasic therapy to the patient synchronized to the sensed actual myocardial motion or pulsatile blood flow, wherein the phasic therapy includes applying a compressive force to the chest of the patient during at least a portion of an ejection phase of the heart and ceasing the application of the compressive force during at least a portion of a relaxation phase of the heart.