Dynamic quantitative assessment of cortical blood flow

Area of Science:

• Neurosurgery
• Medical Devices
• Physiology

Background:

• Accurate assessment of cortical blood flow is crucial for patient outcomes during and after neurosurgical procedures.
• Existing methods for monitoring cerebral blood flow may have limitations in real-time, dynamic quantitative assessment.

Purpose of the Study:

• To evaluate the feasibility of a thermal diffusion flow probe for dynamic, real-time quantitative assessment of cortical blood flow.
• To validate the probe's performance against established methods like Xe133 clearance.

Main Methods:

• Development of a thermal diffusion flow probe utilizing a Peltier stack to generate a thermal gradient.
• Calibration of the thermal gradient against Xenon-133 (Xe133) clearance for measuring fast blood flow.
• Application of the probe during conditions involving rapid flow changes (pharmacologic agents, perfusion pressure alterations, vascular manipulation).

Main Results:

• The thermal diffusion flow probe demonstrated feasibility for dynamic, real-time quantitative assessment of cortical blood flow.
• The probe successfully calibrated against Xe133 clearance for fast flow measurements.
• Rapid changes in cortical blood flow were readily detected and quantified.

Conclusions:

• The thermal diffusion flow probe offers a viable tool for intraoperative monitoring of cortical blood flow.
• This technique holds potential for enhancing postoperative patient monitoring in neurosurgery.