| 摘要 |
A method of removing cardiac artifact during monitoring of a patient's respiration using impedance plethysmography when the patient has a regular, substantially periodic heartbeat. This method comprises generating an impedance signal responsive to both cardiac and respiration activity in the patient's chest. The signal is filtered by removing the cardiac activity component due to its substantially periodic character. An output signal is produced from the filter apparatus which is a function of substantially only the patient's respiration rate. An improved impedance plethysmograph carries out the method substantially as described above.
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