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Computerized photo-plethysmography of the finger
1Department of Anaesthesia, Hôpital Sainte-Justine, Université de Montréal, Québec, Canada.
Summary
A microcomputer system accurately estimates finger photo-plethysmography (PPF) amplitudes and differentiates surgical stimuli during pediatric anesthesia. Computerized PPF readings were slightly higher than manual measurements.
Area of Science:
- Anesthesiology
- Biomedical Engineering
- Pediatric Surgery
Background:
- Photo-plethysmography (PPF) is a non-invasive technique to monitor arterial blood flow.
- Accurate monitoring of physiological parameters is crucial during pediatric anesthesia.
Purpose of the Study:
- To assess the accuracy of computerized photo-plethysmographic (arterial waves) amplitude estimations.
- To evaluate PPF's ability to distinguish between different surgical stimuli in pediatric patients.
Main Methods:
- A microcomputer system was used to record finger photo-plethysmography (PPF) amplitudes in 50 boys (1-10 years old) undergoing general anesthesia.
- Computerized PPF amplitudes (PPA) were compared with manual measurements and correlated with systolic blood pressure and pulse rate changes during surgical stimuli.
Main Results:
- Computerized PPF estimations showed a slight tendency (0.2-0.8 units) to overestimate amplitudes compared to direct measurements.
- PPF values, systolic blood pressure, and pulse rate changes were recorded to evaluate discrimination between skin incision and spermatic cord manipulation.
Conclusions:
- The developed microcomputer system demonstrates potential for accurate PPF amplitude estimation.
- PPF shows promise in differentiating surgical stimuli during pediatric anesthesia, aiding in patient monitoring.