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Related Experiment Video

Updated: Apr 12, 2026

Non-Invasive Monitoring of Microvascular Oxygenation and Reactive Hyperemia using Hybrid, Near-Infrared Diffuse Optical Spectroscopy for Critical Care
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Monitoring Distal Extremity Perfusion with the Pulse Amplitude Monitor during Vascular Reconstruction.

T J Fogarty1, A Biswas1, K L Serra2

  • 1Stanford University School of Medicine, Stanford, California.

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Monitoring distal extremity blood flow in vascular surgery is challenging. A new non-invasive pulse amplitude monitor system offers continuous, objective assessment for improved patient care.

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Area of Science:

  • Biomedical Engineering
  • Vascular Surgery

Background:

  • Current methods for assessing distal extremity blood flow lack objectivity and continuity.
  • Qualitative assessments hinder timely responses to changing perfusion needs during vascular surgery.

Purpose of the Study:

  • To introduce a novel system for non-invasive monitoring and documentation of pulse amplitudes.
  • To address the limitations of existing blood flow assessment techniques in vascular surgery.

Main Methods:

  • Development of a pulse amplitude monitor system comprising a sensor and waveform monitor.
  • The sensor utilizes a piezoelectric film to detect arterial wall oscillations.
  • A compressible foam block ensures consistent sensor contact and vibration isolation.

Main Results:

  • The system provides continuous, objective data on pulse amplitude.
  • Enables documentation of blood flow characteristics.
  • Facilitates comparison of measurements over time and between individuals.

Conclusions:

  • The pulse amplitude monitor system offers a significant advancement in monitoring distal perfusion.
  • It provides a more reliable and objective method for blood flow assessment in vascular surgery.
  • This technology can lead to improved surgical outcomes and patient management.