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The Effect of Alveolar Recruitment Manoeuvre on Optic Nerve Sheath Diameter in Laparoscopic Hysterectomies

NCT06168578 · Status: ACTIVE_NOT_RECRUITING · Type: OBSERVATIONAL · Enrollment: 60

Last updated 2025-09-25

No results posted yet for this study

Summary

Laparoscopic total hysterectomy is the most common gynaecological surgical procedure after caesarean section. In laparoscopic total hysterectomy, intraabdominal pressure increases, venous return decreases, hypercarbia and acidosis may occur due to pneumoperitoneum due to CO2 insufflation and upright trendelenburg position (TP). Cerebral blood flow, intracranial pressure (ICP) and intraocular pressure (IOP) increase. One study showed that TP and an intraabdominal pressure of mmHg significantly increased ICP.

CO2 insufflation into the abdominal cavity causes upward displacement of the diaphragm, resulting in an increased risk of regurgitation, decreased lung volumes and compliance, atelectasis, increased airway resistance and ventilation-perfusion mismatch. At the same time, combined with the effects of general anaesthesia, a decrease in partial arterial oxygen pressure (PaO2) is expected in patients. The alveolar recirculation manoeuvre (ARM), is based on the technique of opening atelectatic lung fields by keeping the airway pressure high for a while. This manoeuvre can be performed with methods such as PEEP, CPAP, and pressure-controlled mechanical ventilation. High PEEP application may cause an increase in ICP and a decrease in cerebral perfusion pressure by increasing intrathoracic pressure and decreasing cerebral venous return. Therefore, intracranial pressure monitoring should be performed especially in patients with PEEP above 8-10 cmH2O.

Intraventricular and intraparenchymal measurements, which are the gold standard methods for ICP monitoring, are invasive procedures with various risks. Noninvasive methods such as cranial CT, brain MRI, transcranial Doppler, and measurement of optic nerve sheath diameter (ONSD) can also be used for ICP measurement. Ultrasonography of the optic nerve sheath diameter is an increasingly common method because it is noninvasive and can be performed at the bedside. The optic nerve sheath is the continuation of the transverse subarachnoid space and the cerebral duramater. It is connected to the intracranial subarachnoid space with cerebrospinal fluid. Therefore, an increase in ICP increases the optic nerve sheath diameter (ONSD). Maissan et al. They think that ONSD reflects the changes in ICP simultaneously. The aim of this study was to evaluate the effect of ARM on intracranial pressure in patients undergoing total laparoscopic hysterectomy under general anaesthesia using optic nerve sheath diameter.

Conditions

  • Recruitment
  • Optic Nerve
  • Hysterectomy

Interventions

DEVICE

ultrasound

Optic nerve diameter will be measured by ultrasound at certain stages of the operation in Group I (ARM-) and Group II (ARM+)

Sponsors & Collaborators

  • Balikesir University

    lead OTHER

Principal Investigators

  • Nazan Kocaoglu · Balikesir University

Eligibility

Min Age
18 Years
Max Age
65 Years
Sex
FEMALE
Healthy Volunteers
No

Timeline & Regulatory

Start
2024-01-15
Primary Completion
2025-12-15
Completion
2026-04-15

Countries

  • Turkey (Türkiye)

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT06168578 on ClinicalTrials.gov