Efficacy of Spontaneous Deep Breathing Technique with Pressure Support/Continuous Positive Airway Pressure during Preoxygenation: A Randomized Controlled Trial

Status

Active, not recruiting

Phases

Phase 4

Study type

Interventional

Source

TCTR

Registry ID

TCTR20180118002

Enrollment

Unknown

Registered

2018-01-18

Start date

2018-01-23

Completion date

Unknown

Last updated

2026-08-03

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

Conditions

Patients who undergoing general anesthesia Peoxygenation Pressure support/CPAP

Interventions

&#45

Oxygen 10 LPM &#45

Pressure support 4 cmH2O+CPAP 4 cmH2O ,&#45

Oxygen 10 LPM

Active Comparator Device,Active Comparator Device

Pressure support/CPAP group,Control group

Eligibility

Sex/Gender

All

Age

18 Years to 65 Years

Inclusion criteria

Inclusion criteria: 1. Age between 18-65 years old 2. ASA physical status I-II 3. Elective surgery requiring general anesthesia 4. Written informed consent obtained

Exclusion criteria

Exclusion criteria: 1. Cardiovascular or lung disease 2. Upper airway problem (chronic hypertrophic tonsillitis, nasal polyps, obstructive sleep apnea) 3. Pregnancy 4. Inflammation or infection of upper abdomen/lung 5. Intra-abdominal mass â‰¥ 20 weeks size 6. Obesity ( Body mass index â‰¥ 30 kg/m2) 7. Current heavy smokingâ‰¥ 20 pack year 8. Beard 9. No teeth 10. Nasogastric tube insertion 11. Face deformity

Design outcomes

Primary

Measure	Time frame
Effectiveness of preoxygenation 1 minute after preoxygenation End-tidal oxygen	—

Secondary

Measure	Time frame
Respiratory discomfort 1 minute after preoxygenation Discomfort score (1-4)	—

Countries

Thailand

Contacts

Public ContactRaweeporn Laopakdee

Khon Kaen Hospital

chang.pm@hotmail.com+66819336756

Outcome results

None listed

Source: TCTR (via WHO ICTRP) · Data processed: Aug 9, 2026