Using formulas to predict left double‑lumen tube depth for chest surgery
The Role of Existing Formulas and Airway Measurements in Determining the Appropriate Placement Depth of the Double-lumen Tube in Thoracic Surgery Anesthesia: a Prospective Observational Study
Ankara Ataturk Sanatorium Training and Research Hospital · NCT07191002
This project tries to see if existing formulas can accurately predict how deep to place the left double‑lumen tube in adults having thoracic (chest) surgery.
Quick facts
| Study type | Observational |
|---|---|
| Enrollment | 30 (estimated) |
| Ages | 18 Years to 80 Years |
| Sex | All |
| Sponsor | Ankara Ataturk Sanatorium Training and Research Hospital (other gov) |
| Locations | 1 site (Ankara) |
| Trial ID | NCT07191002 on ClinicalTrials.gov |
What this trial studies
This is a single-center, prospective observational study enrolling adults aged 18–80 undergoing thoracic surgery who will be intubated with a left double‑lumen tube (DLT). Investigators will record predicted DLT placement depths calculated from published formulas and compare them with the actual placement depth confirmed by fiberoptic bronchoscopy and external anatomical measurements. The trial will analyze how well the existing formulas perform in the Turkish patient population and whether external measurements improve prediction. Outcomes include placement accuracy, need for repositioning, and immediate airway-related events.
Who should consider this trial
Good fit: Adults aged 18–80 with ASA I–III and BMI 18–40 kg/m² who will undergo elective thoracic surgery requiring a left double‑lumen tube and can give informed consent are ideal candidates.
Not a fit: Patients who need a right DLT, are intubated with a single‑lumen tube, are ASA IV or higher, present as emergencies, or fall outside the age/BMI limits are unlikely to benefit from this protocol.
Why it matters
Potential benefit: If successful, the results could reduce repeated intubation attempts, airway trauma, and failed lung isolation by improving initial DLT placement accuracy.
How similar studies have performed: Related formulas and prediction methods have been used in other populations with mixed accuracy, so this is a common approach but requires population‑specific validation.
Eligibility criteria
Show full inclusion / exclusion criteria
Inclusion Criteria: * Patients older than 18 and younger than 80 years * Patients who will undergo surgery under general anesthesia and be intubated with a left DLT * Patients with an American Society of Anesthesiologists (ASA) score of I-II-III * Patients with a body mass index (BMI) between 18-40 kg/m² * Patients who provide informed consent Exclusion Criteria: * Patients requiring right DLT placement * Patients with ASA score IV and above * Patients intubated with a single-lumen tube * Patients in whom lung isolation will be achieved with a method other than DLT * Emergency cases * Patients younger than 18 or older than 80 years
Where this trial is running
Ankara
- Ankara Ataturk Sanatorium Training and Research Hospital, Ankara, 06280 — Ankara, Turkey (Türkiye) (RECRUITING)
Study contacts
- Principal investigator: ELİF DURMUŞ — ANKARA ATATURK SANATORİUM TRAİNİNG AND RESEARCH HOSPITAL
- Study coordinator: ELİF DURMUŞ
- Email: elif.durmuss@hotmail.com
- Phone: +905423838232
How to participate
- Review the eligibility criteria above with your treating physician.
- Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
- Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.
Conditions: Double-lumen Tube, One-lung Ventilation, Thoracic Anesthesia, Double-Lumen Tube, Fiberoptic Bronchoscopy, Airway Measurements, One-Lung Ventilation, Tube Placement Depth