Upper airway collapse characteristics in adult patients with OSA and previous tonsillectomy.

Chen Zhao, Alonço Viana, Yifei Ma, Robson Capasso

Abstract read

In one paragraph

Article in Sleep & breathing = Schlaf & Atmung, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

0numbers the graph read from it

0cells of the map it votes in

1citing papers in PubMed

–field-weighted citation impact, top 89% of its field

1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

1 citing paper in PubMed, 2 citations in OpenAlex.

Mechanical mechanism study of upper airway collapse and twin block treatment in a patient with mandibular retrognathia using fluid-structure interaction simulation.BMC oral health · 2025
Article

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors at 3 institutions in 3 countries.

Chen ZhaoDepartment of Otorhinolaryngology, the First Affiliated Hospital of China Medical University, No.155, North Nanjing Street, Heping District, Shenyang, Liaoning, China. zhaochen@cmu.edu.cn.

Alonço VianaDivision of Sleep Surgery, Department of Otolaryngology-Head & Neck Surgery, Stanford University Medical Center, Stanford, CA, USA.

Yifei MaDepartment of Otolaryngology-Head & Neck Surgery, Stanford University Medical Center, Stanford, CA, USA.

Robson CapassoDivision of Sleep Surgery, Department of Otolaryngology-Head & Neck Surgery, Stanford University Medical Center, Stanford, CA, USA.

Stanford Medicine · USStanford University · USUniversidade Federal do Estado do Rio de Janeiro · BR

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeTo analyze upper airway (UA) collapse patterns through drug-induced sleep endoscopy (DISE) in adult patients with obstructive sleep apnea (OSA) who previously underwent tonsillectomy.

methodsThis was a retrospective study on patients with OSA who underwent DISE between June 1, 2013 and July 30, 2017 at Stanford Hospital. Subjects who had prior tonsillectomy history were classified into the tonsil0 group, whereas others were classified into the tonsil1 and tonsil2/3/4 group based on tonsil grade. UA collapse characteristics were recorded and analyzed among groups according to Velum, Oropharynx, Tongue base and Epiglottis (VOTE) classification.

resultsA total of 205 individuals were included, 38 in tonsil0 group, 104 in tonsil1 and 63 in tonsil2/3/4. The tonsil0 group had a higher percentage of anterior-posterior (AP) velum (58%) and tongue base (45%) collapse compared with the tonsil2/3/4 group (22%, P = 0.0003 and 22%, P = 0.02, respectively) but less oropharyngeal lateral wall collapses (29% vs 53%, P = 0.02). Most of the tonsil0 group (70%) showed multi-sites collapse pattern, the percentage of combined obstruction in both palatopharyngeal and hypopharyngeal region was higher (50% vs 29%, P = 0.03). The difference of velum complete AP collapse remained significant after adjusting for age and BMI (Odds Ratio = 0.33, 95% CI 0.12-0.86, P = 0.02). No significant differences were found between the tonsil0 and tonsil1 groups.

conclusionCompared with individuals with larger tonsils (grade 2 to 4), those with previous tonsillectomy and OSA were susceptible to the velum AP configuration collapse. Diversity of multi-sites obstruction and combined collapse in both palatopharyngeal and hypopharyngeal level was the main characteristic.

Indexed as

Airway ObstructionSleep Apnea, ObstructiveTonsillectomyAdultEndoscopyHumansPolysomnographyRetrospective StudiesSleepDrug-induced sedation endoscopyObstructive sleep apneaSleep endoscopyTonsillectomyUpper airway

Identifiers

PMID34319500

DOI10.1007/s11325-021-02451-8

OpenAlexW3184548110

What OpenQuestion holds

Textmetadata

Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.