Impedance cardiograph and method of operation utilizing peak aligned ensemble averaging

摘要: Parameters of cardiac activity can be derived from detecting thoracic impedance changes in a patient. An excitation signal is applied between first pair electrodes located on the patient's forehead and torso. The voltage across another positioned sensed to provide representing impedance. derivative produces second signal. Samples taken during number cycles are ensemble averaged minimized respiratory artifacts. Different criteria, such as relationship an electrocardiographic signal, employed accept segments which occur different cycles. accepted for minimize data calculate stroke volume output.