A porcine model for renal hemodynamic study during laparoscopy

Area of Science:

• Medical Devices
• Surgical Technology
• Physiology

Background:

• Laser Doppler flowmetry (LDF) is established for measuring microvascular blood flow in various tissues.
• Its application in laparoscopic surgery and for intra-abdominal organ intraparenchymal blood flow remains unexplored.

Purpose of the Study:

• To assess the feasibility and reliability of LDF for measuring renal intraparenchymal blood flow during laparoscopy.
• To evaluate the correlation between LDF measurements and established methods of renal blood flow assessment.

Main Methods:

• Pilot study in pigs: LDF needle probe inserted into renal parenchyma via laparotomy.
• Laparoscopic feasibility study in pigs: LDF probe inserted into renal tissue using endoscopic instruments.
• Comparison with ultrasonic Doppler flowmetry and monitoring of systemic hemodynamic parameters.

Main Results:

• LDF measurements were feasible in all kidney units, correlating excellently with renal arterial blood flow under varying pressures.
• Laparoscopic insertion of the LDF probe was technically successful, with adjustable depth under direct vision.
• Baseline renal cortical and medullary blood flow values were established; spatial and temporal variations were minimal.

Conclusions:

• LDF is a reliable method for assessing renal tissue perfusion in a laparoscopic porcine model.
• The technique provides continuous monitoring of renal hemodynamics, valuable for evaluating laparoscopic procedure safety and efficacy.