Abstract
A part of kinetic heartbeat signal will transmit to lung mechanics, because they are contacted to each other. It means that it might be overlapped to breathing signals, and output as the airflow at the mouth. Thus, we challenged to detect both heartbeat and respiration kinetic signals from the airflow at the mouth. A rat under heavy anesthetic condition was experimentally used to confirm the above phenomenon, and a catheter flow sensor with outer diameter of 1.8 mm was fabricated by MEMS technologies. An electrocardiogram (ECG) was also used as a standard of heartbeat detection. The flow sensor was inserted into a rat's airway, and the airflow dominated mostly by lung breathings was measured. The heartbeat signals caused by physical heart movement was extracted from the airflow waveform by analyzing it with discrete Fourier transform, and its frequency was confirmed to coincident to electrical signal frequency obtained in ECG. We finally concluded that we can simultaneously measure both heartbeat and respiration kinetic functions from the airflow at the mouth.
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