Comparing the Snifing Position , Simple Head Extension and Neutral Position

First Hospital of Qinhuangdao，Hebei Province, China

Status

Completed

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT05331287

Enrollment

Registered

2022-04-15

Start date

2022-04-20

Completion date

2022-08-30

Last updated

2023-02-15

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

Conditions

Therapeutic Procedural Complication

Keywords

Snifing Position, Simple Head Extension, neutral position, Nasotracheal intubation

Brief summary

The simple head extension is recommended for optimization of glottic visualization during Nasotracheal intubation via fiberoptic bronchoscope (FOB) . However, no study confirmed its superiority oversnifing position and Neutral Position. In a prospective, randomized study, the authors compared the snifing position , simple head extension and Neutral Position in Nasotracheal intubation via fiberoptic bronchoscope.

Detailed description

The study included ninety patients with anticipated difficult airways. The snifing position was obtained by placement of a 7-cm cushion under the head of the patient; the extension head position was obtained by placement of a 7-cm cushion under the shoulder; the neutral position with the occiput close to the operating table. The head position was randomized as follows: neutral position group (NP group), sniffing position group (SP group) or extension position group (EP group). Randomization (1:1:1) was based on the codes generated by Excel software, which were kept in sequentially numbered opaque envelopes until the began of study.

Interventions

OTHERHead position

Influence of different head position on nasal endotracheal intubation

Study design

Allocation

RANDOMIZED

Intervention model

SEQUENTIAL

Primary purpose

OTHER

Masking

DOUBLE (Subject, Outcomes Assessor)

Eligibility

Sex/Gender

ALL

Age

18 Years to 70 Years

Healthy volunteers

Inclusion criteria

• ASA classifications of I-II, modified Mallampati classification of 3 or 4, requiring general anesthesia were included.

Exclusion criteria

* • ASA class IV or V * Abnormalities of the heart, brain, liver, lung, kidney and coagulation functions

Design outcomes

Primary

Measure	Time frame	Description
Intubation Time	Ten minutes	The primary endpoints were the time to view the vocal cords (TVC) which was taken when the operator indicated verbally that he view the vocal cords and the time to successful tracheal intubation (TSI). TSI was defined as the time taken from insertion of the FOB between the teeth until the appearance of a capnograhy curve.

Secondary

Measure	Time frame
Occurrence of throat pain measured by VAS	one day Postoperative]

Countries

China

Outcome results

None listed

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