Evaluation of post-tonsillectomy hemorrhage and assessment of risk factors

Postoperative Complications in Lingual Versus Palatine Tonsillectomies

OBJECTIVE

The aim of this study was to investigate the risks of lingual tonsillectomy (LT) in a large cohort and compare these risks to those of palatine tonsillectomy (PT).

METHODS

A retrospective cohort study was conducted using data from the United States collaborative network within TriNetX. The LT group was defined using Current Procedural Terminology (CPT) code 42870 and PT group using CPT codes 42820, 42821, 42825, or 42826. Groups were further subdivided into pediatric and adult populations and matched based on propensity scores within the cohorts. Complications occurring within 14 days of procedure were compared within each cohort.

RESULTS

There were 1,357 adult patients (mean age, 42.9 years) and 863 pediatric patients (mean age, 8.1 years). Adults who had LT were more likely to experience postoperative dysphagia (OR = 2.6, p < 0.001) and require admission to the hospital (OR = 4.3, p < 0.001) or intensive care unit (OR = 6.1, p < 0.001). There was no significant difference in bleeding between adult PT and LT groups, occurring at rates of 3.8% and 4.4%, respectively (p = 0.50). Pediatric patients who had LT were also more likely to experience postoperative dysphagia (OR = 2.4, p = 0.017) and require admission to the hospital (OR = 8.2, p < 0.001) or intensive care unit (OR = 2.7, p = 0.012). The postoperative bleed rate was 3.2% in the pediatric PT cohort, which was 2.4 times higher compared to those who underwent LT (1.5%, p = 0.016).

CONCLUSION

Postoperative complications after lingual tonsillectomy are more common than after palatine tonsillectomy in both adults and children.

LEVEL OF EVIDENCE

3 Laryngoscope, 135:1054-1059, 2025.

Are More Adults Bleeding After Tonsillectomy Than in the Past?

OBJECTIVE

Post-tonsillectomy hemorrhage (PTH) rates have increased in children over the last decade. This study aimed to determine whether PTH incidence in adults had also increased over the last 15 years.

STUDY DESIGN

Retrospective study.

SETTING

TriNetX database.

METHODS

A search was conducted using TriNetX for patients 18 years and older within the US Collaborative Network who had undergone tonsillectomy (CPT codes 42821 or 42826) and yielded 72,232 subjects. PTH diagnoses were identified using ICD-10 codes J95.830 or K91.840, and those who returned to the operating room (RTOR) to control PTH were identified using CPT 42962. PTH events that occurred and analgesics given following 14 days of tonsillectomy were tabulated annually from 2008 to 2022. Mann-Kendall test for monotonic trend examined significant trends in PTH and analgesic use.

RESULTS

Mean age at tonsillectomy was 32.8 years (SD = 13.8). 4.1% were diagnosed with PTH in 2008, compared with 6.2% by 2022 (p = 0.0030). In 2008, 0.7% required RTOR to control PTH, compared with 2.4% in 2022 (p < 0.0001). Use of codeine decreased from 6.9% in 2008 to 2.5% in 2022 (p = 0.0022). Use of ibuprofen, acetaminophen, ketorolac, and oxycodone increased from 1.6% to 23.4% (p = 0.0005), 36.1% to 78.6% (p < 0.0001), 1.5% to 11.9% (p < 0.0001), and 20.6% to 63.6% (p < 0.0001), respectively. No change was detected in use of hydrocodone.

CONCLUSION

Post-tonsillectomy analgesia in adults has changed significantly over the last 15 years. Our study highlights a concurrent increase in PTH which bears more investigation.

LEVEL OF EVIDENCE

3 Laryngoscope, 2025.

Hemorrhage risk after coblation tonsillectomy in Chinese pediatric: a multicenter, prospective, observational cohort study

OBJECTIVES

The study aimed to assess the incidence of post-coblation tonsillectomy hemorrhage (PCTH) and identify associated risk factors in a pediatric Chinese population.

METHODS

This prospective, multicenter cohort study, conducted over 17 months, included 8854 pediatric patients who underwent coblation tonsillectomy across 15 research centers in China. Patient data were collected through an Electronic Data Capture (EDC) system. The primary outcome was the incidence of PCTH within 21 days post-surgery. Secondary outcomes involved analyzing risk factors for PCTH using multivariable logistic regression.

RESULTS

The incidence of PCTH was 1.99%, with 176 patients experiencing hemorrhage. Significant risk factors included abnormal coagulation indicators (OR 10.56), longer surgery duration (OR 1.02), simultaneous adenoidectomy (OR 0.35), semi-liquid diet (OR 0.13), postoperative cough (OR 1.76), and the use of hemostatic agents (OR 1.58), intravenous antibiotics (OR 2.34), and painkillers (OR 2.33). Regional variations showed lower hemorrhage rates in East, Southwest, Central, and South China compared to North China.

CONCLUSIONS

The study found that the hemorrhage rate after coblation tonsillectomy is comparable to traditional tonsillectomy. Risk factors include coagulation status, surgical duration, and postoperative care. Regional differences in hemorrhage rates suggest the need for tailored approaches based on location. Coblation tonsillectomy is a safe and effective procedure for pediatric patients. TRIAL REGISTRATION NUMBER AND DATE OF REGISTRATION FOR PROSPECTIVELY REGISTERED TRIALS: This study was registered on Clinical trials.gov (NCT05206799), and approved by the Ethics Committee of Shanghai Children's Hospital, Shanghai Jiaotong University (2021R096-E01).

Post-Tonsillectomy Bleeding and Analgesic Use Before and After the FDA Boxed Warning Against Codeine

OBJECTIVE

The aim of this study was to investigate the trends in post-tonsillectomy analgesic utility and incidence of post-tonsillectomy hemorrhage before and after the 2013 FDA Boxed Warning against codeine use after pediatric tonsillectomy.

METHODS

A retrospective study was conducted using TriNetX. A search for patients up to 18 years from 2008 to 2022 within the US Collaborative Network identified 15,648,542 subjects. CPT and ICD-10 codes were used to identify children who experienced post-tonsillectomy hemorrhage within 14 days of a tonsillectomy. Analgesics given within 14 days of tonsillectomy were tabulated annually from 2008 to 2022, including codeine, ibuprofen, acetaminophen, oxycodone, ketorolac, and hydrocodone. Bleeding percentage and analgesic utility were grouped into events before and after 2013.

RESULTS

Mean age at tonsillectomy was 5.6 years (SD = 3.0). Before 2013, the median percentage of children who experienced postoperative bleeding was 1.8% with 0.73% returning to the OR for bleeding control. After 2013, the median percentage of children who experienced postoperative bleeding was 2.4% (p = 0.029), and 0.99% returned to the OR (p = 0.008). Use of post-tonsillectomy codeine fell from 10.4% to 0.5% (p = 0.003) whereas ibuprofen rose from 2.0% to 63.9% (p = <0.001), acetaminophen from 42.8% to 77.2% (p = <0.001), ketorolac from 1.2% to 9.2% (p = <0.001), and oxycodone from 2.0% to 30.9% (p = <0.001). No change was detected in use of hydrocodone.

CONCLUSION

Analgesics used post-tonsillectomy in children have changed since the FDA Boxed Warning against codeine. There has been a small but statistically significant increase in post-tonsillectomy bleeding.

LEVEL OF EVIDENCE

4 Laryngoscope, 134:4783-4788, 2024.

Parents' Perception on Post-tonsillectomy Hemorrhage: A Local Survey

INTRODUCTION

Tonsillectomy (often combined with adenoidectomy) is one of the oldest and most common surgical procedures performed in otolaryngology. Post-operative complications following tonsillectomy are generally rare and include post-tonsillectomy hemorrhage, dehydration, velopharyngeal insufficiency, and others. Parents play a crucial role in the care and recovery of their children after tonsillectomy. Their perception and understanding of post-tonsillectomy hemorrhage are essential in managing and addressing this potential complication.

AIM

The purpose of this study is to assess parents' perception of post-tonsillectomy hemorrhage and factors that would lead to its development.

METHODS

A descriptive cross-sectional study was conducted targeting parents of children who had undergone surgical tonsillectomy. Data were collected using a pre-structured online questionnaire, biographical data, tonsillectomy data, child medical and drug history, healthcare staff role, and post-surgical complications and bleeding.

RESULTS

A total of 847 parents completed the study questionnaire, and 431 (50.9%) were fathers. As for education, 164 (19.4%) had a university level of education, and 279 (32.9%) had a post-graduate degree. As for child gender, 445 (52.5%) were males, 232 (27.4%) had undergone the surgery in the first five years of their age, 208 (24.6%) at the age of 6-10 years, and 221 (26.1%) undergone the surgery at the age of 16-18 years. The most reported post-surgical complications included headaches and nausea (52.4%), swelling of the roof of the mouth (51.8%), and infection (48.9%). Primary or secondary post-tonsillectomy hemorrhage was reported among 47 (5.5%) of the children, which was during surgery among 12 (25.5%), within 24 hours after surgery among 14 (29.8%), and after 24 hours of surgery among 21 (44.7%).

CONCLUSION

The current study revealed a high rate of tonsillectomy-associated bleeding with a shortage regarding the role of healthcare staff in child pre-surgical assessment and also in parents' education regarding expected complications.

Postoperative Outcomes of Intracapsular Tonsillectomy With Coblation: A Systematic Review and Meta-Analysis

OBJECTIVE

Following tonsillectomy, postoperative pain and hemorrhage from the tonsillar bed are causes of significant morbidity. Intracapsular tonsillectomy with Coblation is suggested to minimize such morbidity while remaining efficacious in long-term outcomes. This systematic review and meta-analysis assessed short-term morbidity and long-term outcomes from intracapsular tonsillectomy with Coblation, focusing primarily on posttonsillectomy hemorrhage.

DATA SOURCES

Medline, Embase, and the Cochrane Library.

REVIEW METHODS

Guided by PRISMA guidelines, studies on intracapsular tonsillectomy with Coblation published between December 2002 and July 2022 evaluating frequency of posttonsillectomy hemorrhage were screened. Studies without primary data were excluded. Meta-analysis was conducted using the random-effect model. The primary outcome was the proportion of patients who experienced posttonsillectomy hemorrhage. The secondary outcomes were posttonsillectomy pain, the proportion requiring revision tonsillectomy, and severity of sleep-disordered breathing measured by polysomnography outcomes.

RESULTS

From 14 studies there were 9821 patients. The proportion of total posttonsillectomy hemorrhage was 1.0% (95% confidence interval [CI] 0.5%-1.6%, n = 9821). The proportion experiencing primary hemorrhage, secondary hemorrhage, and those requiring further tonsil surgery were 0.1% (95% CI 0.0%-0.1%; study n = 7), 0.8% (95% CI 0.2%-1.4%; study n = 7), and 1.4% (95% CI 0.6%-2.2%; study n = 6), respectively. Mean reduction in apnea-hypopnea index was -16.0 events per hour (95% CI -8.8 to -23.3, study n = 3) and mean increase in oxygen nadir was 5.9% (95% CI 2.6%-9.1%, study n = 3).

CONCLUSION

Intracapsular tonsillectomy with Coblation has been demonstrated to have a low rate of posttonsillectomy hemorrhage. Data regarding long-term tonsil regrowth and need for reoperation were encouraging of the efficacy of this technique.

Risk factors for late postoperative bleeding after partial glossectomy for tongue cancer

BACKGROUND

Partial glossectomy is the most common procedure for early-stage tongue cancer. Although late postoperative bleeding occasionally occurs, the associated risk factors have not been adequately identified.

AIMS/OBJECTIVES

We aimed to investigate the rate and risk factors for late postoperative bleeding after transoral partial glossectomy with or without neck dissection for tongue cancer at our institution.

MATERIAL AND METHODS

We analysed 211 patients who had undergone transoral partial glossectomy between January 2016 and January 2023. The potential risk factors associated with late postoperative bleeding were investigated using univariate and multivariate logistic regression analyses.

RESULTS

Of the 211 patients, 40 (19%) showed late postoperative bleeding, with 19 (9%) classified as grade IIIa (Clavien-Dindo classification). Regarding all grades, late postoperative bleeding was significantly higher in patients aged <70 years and in those with polyglycolic acid (PGA) sheets (p = .046 and .030, respectively). For grade ≥ IIIa, late postoperative bleeding was significantly higher in patients with a history of anticoagulant/platelet administration, a mucosal defect covered with fibrin glue and a PGA sheet (p = .045 and .026, respectively).

CONCLUSIONS AND SIGNIFICANCE

The findings of this study suggest that primary closure decreases the frequency of late postoperative bleeding.

Assessing the Relationship Between Infection Frequency and Risk of Post-Tonsillectomy Hemorrhage

OBJECTIVE

To determine the relationship between frequency of tonsillitis and the risk of post-tonsillectomy hemorrhage (PTH) in pediatric patients undergoing tonsillectomy for recurrent tonsillitis.

METHODS

After obtaining IRB approval from Nationwide Children's Hospital, charts for all patients who underwent a total tonsillectomy in 2017 for recurrent or chronic tonsillitis were retrospectively reviewed (n = 424). Patients were divided into 2 cohorts based on the frequency of tonsillitis prior to surgery: those meeting the 1-year criteria with 7 or more infections in the past year (n = 100), and those who did not meet criteria defined as those with fewer than 7 infections in the past year (n = 324). The primary outcome of interest was PTH. Comparison of cohorts and frequency of PTH were assessed using bivariate analyses. Kaplan-Meier curves were used to compare time to onset of hemorrhage between primary vs. secondary PTH. Generalized mixed and logistic regression models were used to evaluate risk of hemorrhage following tonsillectomy.

RESULTS

Among a total cohort of 424 patients undergoing tonsillectomy, 23.58% (n = 100) met criteria while 76.42% (n = 324) did not. A total of 8.73% (n = 37) patients experienced PTH. Compared to those who did not meet criteria, those who met criteria had a higher odds of developing PTH; however, this was not significant (OR: 1.42 [95% CI: 0.67, 2.98], P = .3582). Estimated probability of developing PTH for those who met criteria was 11% [95% CI: 6.19, 18.81] compared to 8.03% [95% CI: 5.52, 11.54] for those who did not meet criteria. Among all PTH cases, 5.41% (n = 2) were primary hemorrhage while 94.59% (n = 35) were secondary hemorrhage with 50% of those with secondary PTH having experienced hemorrhage within 6 days [95% CI: 5, 7] of tonsillectomy. Patients with neuromuscular conditions had significantly higher odds of PTH (OR: 4.75 [95% CI: 1.19, 18.97], P = .0276).

CONCLUSION

Patients who met the 1-year criteria for tonsillectomy did not have a significantly higher odds of PTH. Further research is needed to better evaluate the relationship between infection frequency and risk of PTH.

The Impact of Surgical Indication on Posttonsillectomy Hemorrhage: A Systematic Review and Meta-Analysis

OBJECTIVE

To investigate the impact of the surgical indication on posttonsillectomy bleed rates.

DATA SOURCES

PubMed, Scopus, CINAHL.

REVIEW METHODS

A systematic review was performed searching for articles published from the date of inception to July 6, 2022. English language articles describing posttonsillectomy hemorrhage rates in pediatric patients (age ≤ 18) stratified by indication were selected for inclusion. A meta-analysis of proportions with comparison (Δ) of weighted proportions was conducted. All studies were assessed for risk of bias.

RESULTS

A total of 72 articles with 173,970 patients were selected for inclusion. The most common indications were chronic/recurrent tonsillitis (CT/RT), obstructive sleep apnea/sleep-disordered breathing (OSA/SDB), and adenotonsillar hypertrophy (ATH). Posttonsillectomy hemorrhage rates for CT/RT, OSA/SDB, and ATH were 3.57%, 3.69%, and 2.72%, respectively. Patients operated on for a combination of CT/RT and OSA/SDB had a bleed rate of 5.99% which was significantly higher than those operated on for CT/RT alone (Δ2.42%, p = .0006), OSA/SDB alone (Δ2.30%, p = .0016), and ATH alone (Δ3.27%, p < .0001). Additionally, those operated on for a combination of ATH and CT/RT had a hemorrhage rate of 6.93%, significantly higher than those operated on for CT/RT alone (Δ3.36%, p = .0003), OSA/SDB alone (Δ3.01%, p = .0014), and ATH alone (Δ3.98%, p < .0001).

CONCLUSION

Patients operated on for multiple indications had significantly higher rates of posttonsillectomy hemorrhage than those operated on for a single surgical indication. Better documentation of patients with multiple indications would help further characterize the magnitude of the compounding effect described here.

The Role of Ipsilateral Tonsillectomy in the Extirpation of Branchial Cleft Anomalies- A Retrospective Monocentric Analysis Over 13 Years

Backround

Branchial cleft anomalies (BCA) can occur as sinuses, fistulas or cysts. They arise from the first, second, third or fourth pharyngeal cleft due to non-fusion or subinvolution. Mostly, located in Robbin's neck-level II, BCA clinically present as a painless compressible swelling, cutaneous draining sinus, or fistula.

Aims

Surgical treatment is the gold standard to prevent recurrence in BCA, though the necessity of ipsilateral tonsillectomy is discussed and was being examined within this work.

Methods

In retrospect, data was collected from patients, that were admitted with the diagnosis BCA between 2006 and 2020 in an academic tertiary care center. 160 patients met inclusion criteria, the data was further evaluated, the focus was set on the occurrence of recurrence.

Results

Recurrence of BCA was observed in 2 out of 160 surgically treated patients (1,25%), one of them with simultaneous tonsillectomy, the other without.

Conclusion

A statistically significant difference in the recurrence-rate between these two groups (with/without tonsillectomy) could not be shown. The performance of an ipsilateral simultaneous tonsillectomy in the surgical workup of BCA cannot be recommended at the basis of our data.

Supplementary Information

The online version contains supplementary material available at 10.1007/s12070-023-03543-5.

Estimated Probability Distribution of Bleeding After Pediatric Tonsillectomy: A Retrospective National Cohort Study of US Children

Importance

The American Academy of Otolaryngology-Head and Neck Surgery Foundation has recommended yearly surgeon self-monitoring of posttonsillectomy bleeding rates. However, the predicted distribution of rates to guide this monitoring remain unexplored.

Objective

To use a national cohort of children to estimate the probability of bleeding after pediatric tonsillectomy to guide surgeons in self-monitoring of this event.

Design, Settings, and Participants

This retrospective cohort study used data from the Pediatric Health Information System for all pediatric (<18 years old) patients who underwent tonsillectomy with or without adenoidectomy in a children's hospital in the US from January 1, 2016, through August 31, 2021, and were discharged home. Predicted probabilities of return visits for bleeding within 30 days were calculated to estimate quantiles for bleeding rates. A secondary analysis included logistic regression of bleeding risk by demographic characteristics and associated conditions. Data analyses were conducted from August 7, 2022 to January 28, 2023.

Main Outcomes and Measures

Revisits to the emergency department or hospital (inpatient/observation) for bleeding (primary/secondary diagnosis) within 30 days after index discharge after tonsillectomy.

Results

Of the 96 415 children (mean [SD] age, 5.3 [3.9] years; 41 284 [42.8%] female; 46 954 [48.7%] non-Hispanic White individuals) who had undergone tonsillectomy, 2100 (2.18%) returned to the emergency department or hospital with postoperative bleeding. The predicted 5th, 50th, and 95th quantiles for bleeding were 1.17%, 1.97%, and 4.75%, respectively. Variables associated with bleeding after tonsillectomy were Hispanic ethnicity (OR, 1.19; 99% CI, 1.01-1.40), very high residential Opportunity Index (OR, 1.28; 99% CI, 1.05-1.56), gastrointestinal disease (OR, 1.33; 99% CI, 1.01-1.77), obstructive sleep apnea (OR, 0.85; 99% CI, 0.75-0.96), obesity (OR,1.24; 99% CI, 1.04-1.48), and being more than 12 years old (OR, 2.48; 99% CI, 2.12-2.91). The adjusted 99th percentile for bleeding after tonsillectomy was approximately 6.39%.

Conclusions and Relevance

This retrospective national cohort study predicted 50th and 95th percentiles for posttonsillectomy bleeding of 1.97% and 4.75%. This probability model may be a useful tool for future quality initiatives and surgeons who are self-monitoring bleeding rates after pediatric tonsillectomy.

Does a tonsillectomy indicated according to the German S2k guideline affect short-term quality of life in adults?

BACKGROUND

Tonsillectomy (TE) for recurrent tonsillitis (RT) is one of the most common surgical interventions. Since 2015, the indication criteria for TE have become much stricter (German S2k guideline). Patient-reported outcome measures (PROMs) of short-term quality of life (QoL) after TE have not yet been investigated.

PURPOSE

To clarify if stringent indication for TE will better identify patients worthy of surgery and patients' QoL.

METHODS

We prospectively studied the Tonsillectomy Outcome Inventory 14 (TOI-14) responses of 38 RT-patients recruited according to the S2k guideline in 2020 and compared their TOI-14 scores with those of a historical RT cohort from 2006 to 2008 and with a healthy middle-European cohort. New RT patients were assessed before, 2, 4, and 14 days and 6 months after TE. TOI-14 was measured as total and as disease-specific score.

RESULTS

From pre- to 6-month postoperative, patients' QoL was significantly different, measured by TOI-14 (49.92 vs. 6.35; p < 0.001) and disease-specific score (60.35 vs. 9.9; p < 0.001). Preoperative disease-specific score was not different from that of the 2nd and 4th postoperative days but from the 14th postoperative day (60.35 vs. 29.26; p < 0.001). The historical cohort had significantly less RT complaints than the new cohort beforehand, but more dissatisfaction in QoL after TE. New TE patients had worse QoL pre- (49.92 vs. 11.78; p < 0.001) but more QoL postoperatively (6.34 vs. 11.78; p = 0.004) than healthy individuals.

CONCLUSIONS

Our results show that the tightening of the indication criteria for TE was justified and that TE patients significantly benefit from this surgery from day 14.

Comparison of three common tonsil surgery techniques: cold steel with hot hemostasis, monopolar and bipolar diathermy

PURPOSE

To analyze the risk of postoperative hemorrhage in tonsil surgery with different surgical methods, instruments, indications, and age groups. Monopolar diathermy compared to bipolar diathermy was of particular interest.

METHODS

The data from tonsil surgery patients were retrospectively collected between 2012 and 2018 in the Hospital District of Southwest Finland. The surgical method, instruments, indication, sex and age and their association with a postoperative hemorrhage were analyzed.

RESULTS

A total of 4434 patients were included. The postoperative hemorrhage rate for tonsillectomy was 6.3% and for tonsillotomy 2.2%. The most frequently used surgical instruments were monopolar diathermy (58.4%) cold steel with hot hemostasis (25.1%) and bipolar diathermy (6.4%) with the overall postoperative hemorrhage rates 6.1%, 5.9% and 8.1%, respectively. In tonsillectomy patients, the risk for a secondary hemorrhage was higher with bipolar diathermy compared to both monopolar diathermy (p = 0.039) and the cold steel with hot hemostasis technique (p = 0.029). However, between the monopolar and the cold steel with hot hemostasis groups, the difference was statistically non-significant (p = 0.646). Patients aged > 15 years had 2.6 times higher risk for postoperative hemorrhage. The risk of a secondary hemorrhage increased with tonsillitis as the indication, primary hemorrhage, tonsillectomy or tonsillotomy without adenoidectomy, and male sex in patients aged ≤ 15 years.

CONCLUSION

Bipolar diathermy increased the risk for secondary bleedings compared to both monopolar diathermy and the cold steel with hot hemostasis technique in tonsillectomy patients. Monopolar diathermy did not significantly differ from the cold steel with hot hemostasis group regarding the bleeding rates.

Development and validation of a machine learning-based predictive model for secondary post-tonsillectomy hemorrhage

Background

The main obstacle to a patient's recovery following a tonsillectomy is complications, and bleeding is the most frequent culprit. Predicting post-tonsillectomy hemorrhage (PTH) allows for accurate identification of high-risk populations and the implementation of protective measures. Our study aimed to investigate how well machine learning models predict the risk of PTH.

Methods

Data were obtained from 520 patients who underwent a tonsillectomy at The 940th Hospital of Joint Logistics Support Force of Chinese People's Liberation Army. The age range of the patients was 2-57 years, and 364 (70%) were male. The prediction models were developed using five machine learning models: decision tree, support vector machine (SVM), extreme gradient boosting (XGBoost), random forest, and logistic regression. The performance of the models was evaluated using the area under the receiver operating characteristic curve (AUC). Shapley additive explanation (SHAP) was used to interpret the results of the best-performing model.

Results

The frequency of PTH was 11.54% among the 520 patients, with 10.71% in the training group and 13.46% in the validation set. Age, BMI, season, smoking, blood type, INR, combined secretory otitis media, combined adenoidectomy, surgical wound, and use of glucocorticoids were selected by mutual information (MI) method. The XGBoost model had best AUC (0.812) and Brier score (0.152). Decision curve analysis (DCA) showed that the model had a high clinical utility. The SHAP method revealed the top 10 variables of MI according to the importance ranking, and the average of the age was recognized as the most important predictor variable.

Conclusion

This study built a PTH risk prediction model using machine learning. The XGBoost model is a tool with potential to facilitate population management strategies for PTH.

Multicentre clinical study of haemorrhage after coblation tonsillectomy in children: a prospective study protocol

INTRODUCTION

Post-tonsillectomy haemorrhage (PTH) is the most common and significant life-threatening complication following tonsillectomy, especially in children. Coblation tonsillectomy (CTE) at low temperature is extensively used in China and has gradually replaced conventional tonsil dissection. However, risk of late PTH has been shown to increase with the use of hot instruments. The aim of this study is to detect post-CTE haemorrhage (PCTH) rates and analyse risk factors of PCTH in China, through a nationwide multicentre prospective study.

METHODS AND ANALYSIS

This investigator-initiated, prospective, multicentre clinical trial will involve children with tonsil disease who will undergo CTE from 22 research centres in different cities in China. All operations will be performed using the same technique of extracapsular tonsillectomy. Data will be collected for all patients enrolled in this study through a preoperative visit, intraoperative data and a postoperative visit. The measurement data conforming to a normal distribution will be expressed by means±SDs, and a Student's t-test will be used for comparison. The comparison among groups of counting data will be expressed by percentage or rate, and a χ² test will be used for comparison. Non-conditional logistic regression analysis will be used to analyse the preoperative, intraoperative and postoperative risk factors for haemorrhage rate after CTE. P<0.05 will be considered statistically significant.

ETHICS AND DISSEMINATION

This study protocol was approved by the Ethics Committee of Shanghai Children's Hospital/Shanghai Jiao Tong University (reference number 2021R096-E01). All patients will provide written informed consent. Results of this study are to be published in respected, peer-reviewed journals and findings presented at scientific conferences in the field of paediatric otorhinolaryngology.

TRIAL REGISTRATION NUMBER

NCT05206799.

Evaluation of Anterior and Posterior Pillar Suturing Following Adult Tonsillectomy in Terms of Hemorrhage, Pain, and Dysphagia Complications

Tonsillectomy is one of the most common surgical procedures performed by otolaryngologists. Postoperative complications, although rare, can be observed in tonsillectomy. This study aimed to investigate the effect of anterior and posterior pillar suturing on dysphagia, hemorrhage, and pain complications following tonsillectomy in adult patients. The study included 80 patients (32 males, 48 females; > 18 years) who underwent tonsillectomy. The patients were divided into two groups: Group 1, in which the tonsillar lodge was closed by anterior-posterior pillar suturing with a 3-0 chromic catgut suture after hemostatic compression and Group 2, in which the tonsillar lodge was exposed following hemostatic compression and bipolar cauterization. Post-surgical pain was assessed using the Numeric Rating Scale (NRS). Oropharyngeal dysphagia was evaluated using the Eating Assessment Tool (EAT)-10. None of the patients experienced postoperative primary hemorrhage. However, postoperative secondary hemorrhage was observed in seven patients, two from Group 1 and five from Group 2. There was no significant difference in postoperative hemorrhage between the two groups (p = 0.449). Furthermore, no statistically significant difference was observed between the two groups in terms of the NRS scores on postoperative day 1 and at postoperative week 2 (p = 0.130 and 0.142, respectively) or the EAT-10 scores at postoperative week 2 and postoperative month 6 (p = 0.925 and 0.090, respectively). Anterior-posterior pillar suturing, which is performed for hemorrhage control after tonsillectomy, is not superior to the conventional bipolar method in terms of postoperative dysphagia, hemorrhage, and pain.

Analysis of risk factors for post-tonsillectomy hemorrhage in adults

OBJECTIVES

To identify the risk factors for post-tonsillectomy hemorrhage (PTH) in adult patients (>19 years).

METHODS

275 adult patients who underwent tonsillectomy between 2009 and 2019 were retrospectively analyzed. Possible risk factors associated with PTH were investigated by univariate and multivariate logistic regression analyses.

RESULTS

PTH occurred in 39 of 275 patients (14.2%). Regarding underlying diseases, PTH occurred more frequently in focal infection of IgA nephropathy. Furthermore, bipolar electrocautery was the other risk factor for PTH on multivariate analysis.

CONCLUSION

Focal infection of IgA nephropathy and bipolar electrocautery were identified as the risk factors for PTH.

[Analysis of risk factors for re-operation due to postoperative haemorrhage following coblation-assisted tonsillectomy]

Objective:To investigate the risk factors for re-operation due to postoperative haemorrhage following coblation-assisted tonsillectomy. Methods:The clinical data of 135 patients with haemorrhage after coblation-assisted tonsillectomy in our hospital from January 2015 to May 2022 were collected, According to the patients received reoperation after tonsillectomy or not, all patients were divided into the reoperation group （n=43） and non-reoperation group （n=92）,clinical data were compared between the two groups. Results:Univariate analysis showed that there was no significant difference in gender, age, postoperative intravenous glucocorticoid use, diabetes and hypertension between the two groups（P>0.05）, Univariate and multivariate factor analyses showed that early haemorrhage, obvious hemorrhage points were independent risk factors for re-operation due to postoperative haemorrhage（P<0.05）. Conclusion:Early haemorrhage and obvious hemorrhage points are independent risk factors for re-operation due to postoperative haemorrhage following coblation-assisted tonsillectomy.

Mucosal immune cell populations and the bacteriome of adenoids and tonsils from people living with HIV on suppressive antiretroviral therapy

Ear, nose, and throat (ENT) conditions are prevalent in people living with HIV (PLWH) and occur at all strata of CD4 counts and despite antiretroviral therapy (ART). ENT conditions are underreported in PLWH. Also, little is known about the adenotonsillar microbiota and its relation to resident adaptive and innate immune cells. To bridge this gap, we characterized immune cell populations and the bacterial microbiota of two anatomical sites (adenoids, tonsils) and the oral cavity. Adenoids and tonsils were obtained from PLWH (n = 23) and HIV-seronegative individuals (SN, n = 16) after nasal surgery and tonsillectomy and processed for flow cytometry. Nasopharyngeal, oropharyngeal swabs, and oral rinses were collected prior to surgery for 16S sequencing. Wilcoxon rank sum test, principal coordinate analysis, permutational multivariate analysis of variance, and linear discriminant analysis (LEfSe) were used to assess differences between PLWH and SN. Spearman’s correlations were performed to explore interactions between the bacteriome and mucosal immune cells. Of the 39 individuals included, 30 (77%) were men; the median age was 32 years. All PLWH were on ART, with a median CD4 of 723 cells. ENT conditions were classified as inflammatory or obstructive, with no differences observed between PLWH and SN. PLWH had higher frequencies of activated CD4+ and CD8+ T cells, increased T helper (Th)1 and decreased Th2 cells; no differences were observed for B cells and innate immune cells. Alpha diversity was comparable between PLWH and SN at all 3 anatomical sites (adenoids, tonsils, and oral cavity). The impact of HIV infection on the bacterial community structure at each site, as determined by Permutational multivariate analysis of variance, was minor and not significant. Two discriminant genera were identified in adenoids using LEfSe: Staphylococcus for PLWH and Corynebacterium for SN. No discriminant genera were identified in the oropharynx and oral cavity. Niche-specific differences in microbial diversity and communities were observed. PLWH shared less of a core microbiota than SN. In the oropharynx, correlation analysis revealed that Th17 cells were inversely correlated with bacterial richness and diversity, Filifactor, Actinomyces and Treponema; and positively correlated with Streptococcus. Our study contributes toward understanding the role of the adenotonsillar microbiota in the pathophysiology of ENT conditions.

Traffic pollution tracers in the lymphatic system tissue of children-possible link to chronic tonsillitis development: pilot study

The origin of metal elements in tonsillar tissues of children patients was investigated in order to establish the link between environmental pollution and tonsilitis diagnosis. The children lived either in a polluted, industrial region (Moravian-Silesian Region, North-East Czechia) or a clean, predominantly agricultural region (South Bohemian Region, South-East Czechia). Simultaneously, the distance of the address of the patients to the closest main road was assessed. The elemental content of the present particulate matter in the tonsil samples, coming from indicated tonsillectomies, was analysed using scanning electron microscopy equipped with an X-ray microprobe. No significant association of the elemental composition and the region was found using both bivariate and multivariate methods; however, an association with the distance to the closest main road was found. The study presents a novel assessment of the tonsillar tissues and supports the link between environmental factors (traffic-related particulate pollution) and the onset of chronic, idiopathic diseases in children, which has been debated recently.

Adult tonsillectomy: An evaluation of indications and complications

OBJECTIVE

This study aimed to evaluate current adult tonsillectomy indications along with risk factors associated with postoperative complications.

METHODS

In this retrospective chart review, demographic, clinical, and surgical data were collected from 2004 to 2020 of adult patients who underwent tonsillectomy. Indications for surgery were categorized as infectious etiology, biopsy, obstructive sleep apnea (OSA), and tonsillar stones. Data regarding postoperative hemorrhage, emergency department (ED) visits, and readmissions were collected. Multivariable logistic regression models were used to evaluate factors associated with postoperative complications.

RESULTS

574 adults (mean age 32 years, 69.9% F vs. 30.1% M) were included. The most common indication was infections (62.2%), followed by biopsy (26.5%), tonsillar stones (6.8%), and OSA (4.5%). The highest frequency of postoperative bleeds (17.9%) occurred in the tonsillar stones cohort; however, the indication for surgery was not a significant predictor on multivariate analysis. Male sex and younger age were independent predictors of postoperative bleeding, while younger age was a significant predictor of postoperative ED visits. There was a significant linear trend of an increasing proportion of tonsillectomies performed for tonsillar stones compared to other indications for 2011-2019.

CONCLUSION

Infectious etiology was the most common indication for tonsillectomy. Indication for surgery was not a significant predictor of postoperative bleeding; however, male sex and younger age had higher odds of postoperative bleeding. The proportion of tonsillectomies performed for tonsillar stones was steadily increasing.