Photoplethysmography-Based Blood Pressure Monitoring Could Improve Patient Outcome during Anesthesia Induction

Area of Science:

• Anesthesiology
• Biomedical Engineering
• Medical Devices

Background:

• Noninvasive cuff-based blood pressure (BP) monitors are standard for anesthesia but provide intermittent readings.
• Gaps in continuous BP data risk missing critical, rapid patient variations during anesthesia.
• Photoplethysmography (PPG) offers a potential for continuous, noninvasive BP monitoring.

Purpose of the Study:

• To evaluate the added value of a PPG-based continuous BP device combined with standard cuff monitoring.
• To assess the impact on BP measurement accuracy and patient safety during anesthesia induction.

Main Methods:

• A cohort of 40 patients undergoing anesthesia was monitored.
• Comparison between standard intermittent cuff-based BP monitoring and combined cuff-based and PPG-based continuous BP monitoring.
• Analysis included mean error reduction and error grid analysis for patient risk assessment.

Main Results:

• Combined PPG and cuff monitoring reduced systolic BP error from 2.6 ± 19.6 mmHg to 0.5 ± 11.2 mmHg.
• Mean BP error was reduced from 1.2 ± 13.2 mmHg to 0.0 ± 8.1 mmHg with the combined approach.
• Error grid analysis showed a significant decrease in data points falling into higher patient risk categories for both systolic and mean BP.

Conclusions:

• Integrating PPG-based continuous BP monitoring with standard cuff devices enhances patient safety during anesthesia induction.
• The combined approach significantly improves BP measurement accuracy compared to intermittent cuff measurements alone.
• This method offers improved safety without the need for additional sensors.