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The Effect of Head Position on the Optik Nerve Sheath Diameter in Patients During Thyroid Surgery

The Effect of Head Position on the Optik Nerve Sheath Diameter in Patients During Thyroid Surgery

Status
Completed
Phases
Unknown
Study type
Observational
Source
ClinicalTrials.gov
Registry ID
NCT07298187
Enrollment
49
Registered
2025-12-23
Start date
2025-04-01
Completion date
2025-11-03
Last updated
2025-12-23

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Thyroid Adenoma, Thyroid and Parathyroid Surgery, Thyroid Cancer

Brief summary

THE EFFECT OF HEAD POSİTİON ON THE OPTİC NERVE SHEATH DİAMETER İN PATİENTS DURİNG THYROİD SURGERY

Detailed description

Aim: In thyroidectomy surgery, the patient's head is placed in hyperextension and the patient is placed in a semi-sitting position to facilitate access to the surgical site. This position of the head causes a decrease in venous return or partial obstruction of venous return due to stretching of the neck veins. The aim of our study is to demonstrate the effect of surgical position on intracranial pressure by measuring the optic nerve sheath diameter (OSSD) using ultrasonography in patients undergoing thyroid surgery and to determine its correlation with post-operative headaches. Material And Method: Our study was conducted prospectively and randomly in patients undergoing elective total thyroidectomy. Patients aged 18-65 with an ASA score of 1-2 and an operation time of less than 4 hours were included in our study. Patients were positioned in the semi-Fowler position with a 30° extension of the head. Bilateral OSSD surgical positioning was applied, and after ensuring haemodynamic stability for 5 minutes and at the end of the operation, measurements were taken twice using ultrasound, and the average was recorded. The Visual Analogue Scale (VAS) was used to assess postoperative pain intensity. Headache was assessed and recorded at 15 minutes, 30 minutes, 1 hour, 24 hours, 3 days, and 7 days postoperatively.

Interventions

None listed

Sponsors

Istanbul University - Cerrahpasa
Lead SponsorOTHER

Study design

Observational model
CASE_ONLY
Time perspective
PROSPECTIVE

Eligibility

Sex/Gender
ALL
Age
18 Years to 65 Years
Healthy volunteers
Yes

Inclusion criteria

* Patients aged between 18 and 65, with an ASA score between 1 and 2 according to the American Society of Anesthesiologists (ASA) physical status classification system * whose surgery duration was expected to be less than 4 hours were included in our study.

Exclusion criteria

* liver failure * kidney failure * intracranial masses * history of hydrocephalus, * migraine * chronic hypoxemia or hypercarbic lung disease * additional heart disease * hemodynamic insufficiency * neurological and psychiatric diseases, * glaucoma * patients in whom ocular USG could not provide adequate images * patients with pathological problems involving the eyelid and its surrounding area * patients with diseases such as periorbital cellulitis * patients with preoperative headache complaints * patients with known diseases that could cause increased intracranial pressure * patients who refused to participate in the study were excluded from the study.

Design outcomes

Primary

MeasureTime frameDescription
OPTİC NERVE SHEATH DİAMETERINTRAOPERATİVE PERİOD(FROM İNDUCTİON TO THE END OF SURGERY)CHANGE İN OPTİC NERVE SHEATH DİAMETER MEASURED BY ULTRASOUND BEFORE AND AFTER POSİTİONİNG DURİNG THYROİDECTOMY

Secondary

MeasureTime frameDescription
POSTOPERATİVE HEADACHE SEVERİTY (VISUAL ANALOG SCALE)WİTHİN SEVEN DAYS AFTER SURGERYTHE SEVERİTY OF POSTOPERATİVE HEADACHE WİLL BE ASSESSED USİNG A VİSUAL ANALOG SCALE. THE LOWEST POSSIBLE SCORE ON THE VISUAL ANALOG SCALE WAS 0, AND THE HIGHEST POSSIBLE SCORE WAS 10.

Countries

Turkey (Türkiye)

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026