Comparison of the Effects of Different PEEP Values With USG on Optic Nerve Sheath Diameter

NCT ID: NCT06224868

Last Updated: 2024-01-25

Basic Information

• Recruitment Status: NOT_YET_RECRUITING
• Clinical Phase: NA
• Total Enrollment: 45 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2024-01-15
• Study Completion Date: 2024-06-15

Brief Summary

Laparoscopic surgeries are now more popular because of the advantages such as shorter hospital stay, minimal scar. In order to perform laparoscopic surgery, pneumoperitoneum should be initiated. The optic nerve sheath is an extension of the dura mater and the subarachnoid space is continuous with the intracranial subarachnoid space. Therefore, non-invasive monitoring of the increase in intracranial pressure (ICP) can be achieved by measuring the optic nerve and sheath diameter with ultrasound. Since ONSD measurement with ultrasound is an easily applicable technique, it is useful in monitoring intracranial pressure changes based on the optic nerve diameter during intraoperative changes

Detailed Description

Laparoscopic surgeries are now becoming increasingly common compared to traditional laparotomies, as they have advantages such as more minimal scarring, shorter hospital stay, fewer complications, and early mobilization. In these surgeries, pneumoperitoneum provided with carbon dioxide (CO2) has many effects on the cardiovascular, pulmonary, renal, metabolic and cerebral systems. Pulmonary compliance and functional residual capacity decrease due to pnemoperitoneum, ventilation/perfusion mismatch occurs, and as a result, hypoxemia may occur. A minimum of 4-6 cm H20 positive end-expiratory pressure (PEEP) should be applied to all intubated patients under general anesthesia to reduce postoperative pulmonary complications (especially atelectasis) and prevent ventilation/perfusion mismatch and hypoxemia. The optic nerve sheath is an extension of the dura mater and the subarachnoid space is continuous with the intracranial subarachnoid space. Therefore, non-invasive monitoring of the increase in intracranial pressure (ICP) can be achieved by measuring the optic nerve and sheath diameter with ultrasound. When ICP is > 20 mm Hg, measuring the optic nerve sheath diameter (ONSD) between 5.2 and 5.9 mm has a sensitivity of 74-95% and a specificity of 74-100%. Since ONSD measurement with ultrasound is an easily applicable technique, it is useful in monitoring intracranial pressure changes based on the optic nerve diameter during intraoperative changes (trendelenburg/reverse trendelenburg position, pneumoperitoneum , PEEP in mechanical ventilation).

Conditions

Cholecystitis

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: DIAGNOSTIC
• Blinding Strategy: DOUBLE

Study Groups

PEEP 0

After the patient is intubated, PEEP 0 will be set on the mechanical ventilator.

Group Type: ACTIVE_COMPARATOR

insufflation

Intervention Type: OTHER

Laparoscopic surgery begins with intraabdominal placement of the insufflation needle or trochar, followed by carbon dioxide (CO2) insufflation of the abdominal cavity to an intraabdominal pressure (IAP) of 12 to 15 mm Hg (Normal values are 5-7 mmHg) it is aimed to monitor optic sheat nerve diameter and lung ultrasound score changes with different intraabdominal pressures.

desufflation

Intervention Type: OTHER

Laparoscopic surgery begins with intraabdominal placement of the insufflation needle or trochar, followed by carbon dioxide (CO2) insufflation of the abdominal cavity to an intraabdominal pressure (IAP) of 12 to 15 mm Hg. When the surgery is completed, the trochars are removed and intra-abdominal pressure is returned to normal which is 5-7 mmHg.

PEEP 5

After the patient is intubated, PEEP 5 will be set on the mechanical ventilator.

Group Type: ACTIVE_COMPARATOR

insufflation

Intervention Type: OTHER

Laparoscopic surgery begins with intraabdominal placement of the insufflation needle or trochar, followed by carbon dioxide (CO2) insufflation of the abdominal cavity to an intraabdominal pressure (IAP) of 12 to 15 mm Hg (Normal values are 5-7 mmHg) it is aimed to monitor optic sheat nerve diameter and lung ultrasound score changes with different intraabdominal pressures.

desufflation

Intervention Type: OTHER

Laparoscopic surgery begins with intraabdominal placement of the insufflation needle or trochar, followed by carbon dioxide (CO2) insufflation of the abdominal cavity to an intraabdominal pressure (IAP) of 12 to 15 mm Hg. When the surgery is completed, the trochars are removed and intra-abdominal pressure is returned to normal which is 5-7 mmHg.

PEEP 10

After the patient is intubated, PEEP 10 will be set on the mechanical ventilator.

Group Type: ACTIVE_COMPARATOR

insufflation

Intervention Type: OTHER

Laparoscopic surgery begins with intraabdominal placement of the insufflation needle or trochar, followed by carbon dioxide (CO2) insufflation of the abdominal cavity to an intraabdominal pressure (IAP) of 12 to 15 mm Hg (Normal values are 5-7 mmHg) it is aimed to monitor optic sheat nerve diameter and lung ultrasound score changes with different intraabdominal pressures.

desufflation

Intervention Type: OTHER

Laparoscopic surgery begins with intraabdominal placement of the insufflation needle or trochar, followed by carbon dioxide (CO2) insufflation of the abdominal cavity to an intraabdominal pressure (IAP) of 12 to 15 mm Hg. When the surgery is completed, the trochars are removed and intra-abdominal pressure is returned to normal which is 5-7 mmHg.

Interventions

insufflation

Laparoscopic surgery begins with intraabdominal placement of the insufflation needle or trochar, followed by carbon dioxide (CO2) insufflation of the abdominal cavity to an intraabdominal pressure (IAP) of 12 to 15 mm Hg (Normal values are 5-7 mmHg) it is aimed to monitor optic sheat nerve diameter and lung ultrasound score changes with different intraabdominal pressures.

Intervention Type: OTHER

desufflation

Laparoscopic surgery begins with intraabdominal placement of the insufflation needle or trochar, followed by carbon dioxide (CO2) insufflation of the abdominal cavity to an intraabdominal pressure (IAP) of 12 to 15 mm Hg. When the surgery is completed, the trochars are removed and intra-abdominal pressure is returned to normal which is 5-7 mmHg.

Intervention Type: OTHER

Eligibility Criteria

Inclusion Criteria

• 18- 65 aged all female and male volunteers

Exclusion Criteria

• acute or chronic eye diseases,
• uncontrolled hypertension,
• asthma
• known lung disease,
• body mass index (BMI) over 35 kg/m2,
• devices using bulbs with known intracranial charging,
• who refuse to participate in care

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 65 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

Baskent University

OTHER

Sponsor Role: lead

Responsible Party

Begüm Nemika Gökdemir

Research Assistant

Responsibility Role: PRINCIPAL_INVESTIGATOR

Central Contacts

Begum N Gokdemir

Role: CONTACT

begokdemir@yahoo.com

03122036868

Other Identifiers

KA 23/230

Identifier Type: -

Identifier Source: org_study_id