Monitoring technologies provider Masimo has reported positive outcome from a clinical study of Masimo PVi (Pleth Variability Index) monitoring in low-risk patients undergoing colorectal surgery.

PVi is a measure of the dynamic changes in perfusion index (PI), which take place during the respiratory cycle. Masimo PVi is designed to be continuous and non-invasive.

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Conducted by Dr Warnakulasuriya and colleagues at York Teaching Hospital in York, UK, the study showed that PVi offers a non-invasive alternative for goal-directed therapy in this group of patients.

“No significant difference was found between the two technologies in mean total fluid administered or mean intraoperative fluid balance.”

The researchers evaluated the utility of Masimo Pvi monitoring to guide fluid management, when compared to an invasive method such as esophageal Doppler in 40 patients.

Masimo founder and chief executive officer Joe Kiani said: “Clinical evidence for the utility of Masimo PVi continues to amass.

“Dr. Warnakulasuriya’s study provides additional information about the benefits of PVi.

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“We are grateful for the opportunity we have to continue to improve patient outcomes and reduce cost of care with our innovative noninvasive monitoring.”

The absolute volume of fluid given intraoperatively and fluid volume at 24 hours were measured in the study.

No significant difference was found between the two technologies in mean total fluid administered or mean intraoperative fluid balance.

Previous studies showed that PVi monitoring has benefits in case of mechanically-ventilated patients under general anesthesia during surgery and septic patients who are in early stages of shock.

A study of PVi as a goal-directed therapy for patients in an enhanced recovery after surgery (ERAS) programme following colorectal surgery, indicated decrease of lengths of stay, costs, surgical site infections and fluid administered.