Comparison of the Effect of Supine and Prone Position on the Ultrasonographic Airway Measurements

A Prospective Randomized Comparison of the Effect of Supine and Prone Position on the Ultrasonographic Upper Airway Measurements and Postoperative Critical Respiratory Events

Status

Completed

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT05197400

Enrollment

Registered

2022-01-19

Start date

2022-02-01

Completion date

2022-07-01

Last updated

2025-01-15

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

Conditions

Airway Edema, Obstructive Sleep Apnea, Respiratory Complication

Keywords

airway edema, obstructive sleep apnea, respiratory complications

Brief summary

The aim of this study is to compare the preoperative and postoperative ultrasonographic measurements of patients undergoing in the prone position and the change in upper airway edema. The secondary aim of the study is to investigate the relationship between OSAS risk levels determined by the STOP-BANG score in the preoperative period of the patients participating in the study, and airway ultrasound measurements and postoperative critical respiratory events in the preoperative and postoperative period.

Interventions

DIAGNOSTIC_TESTpreoperative airway ultrasonography

Tongue thickness Median sagittal tongue cross-sectional area Tongue width Tongue volume: Lateral parapharyngeal wall thickness

DIAGNOSTIC_TESTpostoperative airway ultrasonography

Tongue thickness Median sagittal tongue cross-sectional area Tongue width Tongue volume: Lateral parapharyngeal wall thickness

Study design

Allocation

RANDOMIZED

Intervention model

PARALLEL

Primary purpose

SCREENING

Masking

DOUBLE (Investigator, Outcomes Assessor)

Eligibility

Sex/Gender

ALL

Age

18 Years to 75 Years

Healthy volunteers

Yes

Inclusion criteria

1-American Society of Anesthesiologists Physical Status Classification (ASA) I-II-III-IV risk group who will undergo Percutaneous Nephrolithotomy surgery

Exclusion criteria

1. prone position contraindications 2. history of maxillofacial deformity, tumor or trauma, 3. difficult airway history 4. decompensated cardiac, respiratory, hepatic, renal diseases 5. cervical spine fracture 6. Patients refusal -

Design outcomes

Primary

Measure	Time frame
Preoperative Tongue thickness	Baseline, preoperative
postoperative Tongue thickness1	postextubation
postoperative Tongue thickness2	postoperative 2. hour]
preoperative Tongue volume	Baseline, preoperative
postoperative Tongue volume1	postextubation
postoperative Tongue volume2	postoperative 2. hour
Preoperative Lateral parapharyngeal wall thickness	Baseline, preoperative
postoperative Lateral parapharyngeal wall thickness1	postextubation
postoperative Lateral parapharyngeal wall thickness2	postoperative 2. hour
Critical respiratory events	Within postoperative 2 hours

Countries

Turkey (Türkiye)

Outcome results

None listed

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