Reyhan ARSLANTAŞ, Mustafa Kemal ARSLANTAŞ, Gülbin Töre ALTUN, Pelin CORMAN DINÇER

The effects of pneumoperitoneum and patient position on the perfusion index and pleth variability index during laparoscopic bariatric surgery

Objective: Limited data are available on the use of the perfusion index (PI) and the pleth variability index (PVI) during laparoscopicbariatric surgery. We investigated the effects of pneumoperitoneum and the reverse Trendelenburg position on these indices.Materials and Methods: PI, PVI, heart rate (HR), blood pressure, SpO2 and ventilation parameters were recorded before anaesthesiainduction (T0), 5 min after endotracheal intubation (T1), immediately before surgery, after the patient had been in the reverseTrendelenburg position for 5 min (T2), after inflating the abdomen with CO2 in reverse Trendelenburg (T3), after the abdomen hadbeen deflated (T4) and 5 min after extubation (T5).Results: General anaesthesia induced an increase in the PI (P<.001), and a decrease in the PVI (P=.002). The PI and PVI values werenot affected during T2 or T3. Pneumoperitoneum caused an increase in mean arterial pressure (MAP) and a decrease in HR. PVI andMAP decreased during T4, but the PI and HR remained unchanged. PVI, HR and MAP increased during T5.Conclusion: Our data suggest that the reverse Trendelenburg position and pneumoperitoneum did not affect the PI or PVI values,whereas deflation decreased the PVI in morbidly obese patients under general anaesthesia.

Keywords:

Anaesthesia Morbid obesity, Pleth variability index, Perfusion index, Bariatric surgery,

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