Introduction: Pulse oximetry, which noninvasively detects the blood flow of peripheral tissue, has achieved widespread clinical use. We have noticed that the pulse waveform frequency can reflect the rate and interruption time of chest compression(CC) during cardiopulmonary resuscitation(CPR). But the clutter waves generated by CC always affect the accuracy. And a new method of frequency domain analysis may solve the problem.
Hypothesis: We investigated whether the pulse waveform frequency by a new method of frequency domain analysis could be used to calculate the rate and interruption time of CC.
Methods: There are 4 pigs enrolled in this study. After 4 minutes of untreated ventricular fibrillation, CC began and both the pulse oximetry probe and the physical parameter monitors (including blood pressure monitor, the force sensor and the acceleration sensor) were connect to the same animal to record the chest compression rate and the pulse waveforms. And the pulse waveform frequency was calculated by frequency domain analysis, which can avoid other clutter waves generated by interference.
Results and Conclusions: The frequency calculated according to the pulse waveform by a new method of frequency domain analysis were precisely matched the chest compression rate. The pulse oximetry might be potential marker to calculating the rate of chest compression and interruption time during CPR.