Influence of intra-abdominal pressure on the amplitude of fluctuations of cerebral hemoglobin concentration in the respiratory band

Abstract

An intra-abdominal pressure (IAP) is correlated with cerebral perfusion, in a mechanism of reducing venous outflow. The elevated intra-abdominal pressure leads to an increase in the intracranial pressure and a decrease in the cerebral perfusion pressure. We studied the relationship between the IAP and the cerebral oxygenation with the use of the near infrared spectroscopy technique during a gynecological surgery. The changes in hemoglobin concentrations were analyzed in the time-frequency domain in the frequency band related to respiration. The measurements were carried out in 15 subjects who underwent laparoscopic surgery. During the laparoscopy, the intra-abdominal cavity was insufflated with CO2, which caused a controlled increase in the IAP. It was observed that the amplitudes of respirationrelated waves present in hemoglobin concentration signals show an increase of 1.5 to 8.5 times during elevation of the IAP by 15 mmHg.

The Effect of Intraoperative Fluid Therapy on Postoperative Renal Functions in Patients Undergoing Hyperthermic Intraperitoneal Chemotherapy and Cytoreductive Surgery: A Retrospective Observational Study

“…The patients undergoing long and complicated surgical procedures have also increased intraabdominal pressure which may lead to an increase in the intracranial pressure and a decrease in the cerebral perfusion pressure [17]. The results reported by Sawoszy et al [17] were consistent with reports observing the relationship between intracranial pressure and intraarterial pressure. The NIRS-based technique, which is noninvasive and easy to apply at the bedside, allows to study these relationships indirectly.…”

Shedding light on pain for the clinic: a comprehensive review of using functional near-infrared spectroscopy to monitor its process in the brain

“…1). In the clinical environment, investigators have studied thermal stimuli-triggered dental pain, 52,54,120,131 surgeryinduced pain, 42,72,73,95,122,135 acupuncture-evoked pin-prick pain, 38,129 and similar venipuncture pain on infants. 10,106,107,128,130,142 On the other hand, in the experimental environment, researchers have studied acute pain conditions triggered by thermal, 7,8,13,37,51,119,174 mechanical, 10,13,42,49,51,76,106,129,131,142,157,159,160 electrical, 2,35,96,109,110,125,175 and chemical 40,56 stimulations, even pain imagery…”