Monitoring dogs during minimally invasive laparoscopic surgery

German shorthair dog in the snow


Status: Open and enrolling
Principal Investigator: 
Wanda Gordon-Evans

Alena Strelchik, DVM
Small Animal Surgery Resident
[email protected]

I'm Interested

Study title

Prospective, randomized, clinical trial on the assessment on the effects of laparoscopic insufflation pressures on portal pressures and dynamic respiratory compliance in dogs with various disease states

Purpose of study

During minimally invasive laparoscopic surgery, the abdominal cavity is insufflated (filled with CO2 gas) to allow better visualization. This technique offers several advantages over conventional surgery, such as reduced postoperative pain, shorter hospitalization times, and improved visualization of vital structures. Although we are routinely performing laparoscopy in various patients, we have yet to fully explore how this affects particular cardiovascular systems, such as the portal vein blood flow. Through the proposed work, we will generate data that will aid in optimizing laparoscopic surgery for various disease states.

Eligibility criteria

Dogs that are already scheduled for minimally invasive laparoscopic surgery by the University of Minnesota Surgery Service are eligible for enrollment in the study. Surgeries include:

  • Laparoscopic liver, kidney, or intestinal biopsy
  • Laparoscopic spays (ovariectomy, ovariohysterectomy)
  • Laparoscopic cryptorchidectomy or vasectomy
  • Laparoscopic assisted cystotomy
  • Laparoscopic gastropexy
  • Laparoscopic hernia repair
  • Laparoscopic adrenalectomy or nephrectomy

Dogs should not:

  • Be high risk anesthesia patients
  • Weigh less than 12 pounds
  • Have significant comorbidities, as determined by the attending clinician or anesthesiologist


  • Patients will have a vein from the intestines catheterized and attached to a pressure measurement system at no cost to the client
  • Pressure assessments will be made at various insufflation levels (previously proven to be safe for patients undergoing laparoscopy)
  • Following completion of measurements, the catheter will be removed and the predetermined procedure commenced
  • Additional anesthetic and pressure monitoring, including complimentary blood gas analysis, respiratory compliance monitoring, organ blood flow monitoring, will be assessed at no cost to the client


By enrolling in this study, you are helping to advance the veterinary field, however no direct monetary compensation will be provided for enrollment. There will be no additional costs associated with participation in the study. The minimally invasive laparoscopic procedure will be charged per standard protocols. Once enrolled, the study will pay for the following: blood gas analysis and interpretation, vital organ pressure assessment, dynamic respiratory compliance measurements, response to insufflation.