Long-term complications after tonsil surgery: an analysis of 54,462 patients from the Swedish Quality Register for Tonsil Surgery.

Objective: This study aims to evaluate long-term complications after tonsil surgery using an exploratory retrospective cohort study design based on data from the Swedish Quality Register for Tonsil Surgery (SQTS). Methods: All patients registered in the SQTS between 1 January 2009 and 31 May 2021 were eligible for the study. In this study, a long-term complication is defined as any complication persisting for a minimum of 6 months after surgery. The definition of a complication was based on individual patient reports, provided in a free text format, of any remaining issues 6 months after tonsil surgery. Complications were categorized as follows: disturbed taste or sense of smell, dysphagia, miscellaneous and general symptoms and signs, miscellaneous throat problems, pain or discomfort in the mouth or throat, problems with jaws or teeth, problems with the ears or hearing, problems with the nose or sinuses, problems with throat secretions or throat clearing, problems with voice or speech, and sensory symptoms. A multivariable logistic regression analysis was used to identify independent predictors of long-term complications. Results: In total, 54,462 patients were included in the study. A total of 3,780 patients (6.9%) reported one or more long-term complications. The most frequent long-term complications, with a plausible connection to the surgery, were found in the following categories: pain or discomfort in the mouth or throat (1.9%), problems with throat secretions or throat clearing (0.8%), dysphagia (0.6%), and problems with voice or speech (0.6%). Tonsillotomy was associated with a lower risk of long-term complications than tonsillectomy. Conclusion: This study suggests that subjective long-term complications after tonsil surgery, in general, are relatively common (6.9%). However, complications with a plausible connection to the surgery were less common (4.0%), and specific complications seemed to be relatively rare, with no single specific problem reaching a prevalence of ≥0.6%.

Postoperative morbidity and mortality after adenoidectomy: A national population-based study of 51 746 surgeries.

OBJECTIVES: To investigate postoperative morbidity and mortality after paediatric adenoidectomy. METHODS: This was a retrospective national population-based cohort study of data from the Swedish National Patient Register (NPR) and The Swedish Cause of Death Register (CDR). All patients aged 0-18 years who underwent adenoidectomy from 2007 to 2017 (without concomitant tonsil surgery) were included in this study. To evaluate postoperative morbidity and mortality, all diagnostic and surgical codes registered in the NPR for health care contacts within 30 days of surgery were analysed. The patients retrieved from the NPR were matched with the CDR to identify any deaths occurring within 30 days of the surgery. RESULTS: A total of 51 746 adenoidectomies were included in this study. No deaths related to adenoidectomy were identified. All types of haemorrhagic complications were rare. Only 0.1% of the surgeries resulted in an outpatient contact due to postoperative haemorrhage and only 0.1% of the adenoidectomies resulted in a readmission due to haemorrhage. The rarest haemorrhagic complication was RTT (return to theatre), with only 4 events (0.01%). Postoperative haemorrhage was most frequent on the first day after surgery. Other complications were rare as well, requiring a total of 922 (2.6%) outpatient visits and 75 (0.2%) readmissions in the adenoidectomy group, with postoperative infection being the most commonly reported. CONCLUSIONS: Overall, adenoidectomy should be considered a safe surgical procedure associated with few postoperative complications. No deaths related to adenoidectomy were found. Severe complications, such as late postoperative haemorrhage after adenoidectomy, were rare, and haemorrhage resulting in RTT was even rarer. The highest rate of postoperative haemorrhage was observed the first day after surgery, and most haemorrhagic complications occurred within a week. Comparisons with studies on tonsil surgery show that adenoidectomy is associated with substantially lower postoperative morbidity.

Comparison of clinical practice of tonsil surgery from quality register data from Sweden and Norway and one clinic in Denmark.

OBJECTIVES: To compare the application of indications, demographics, surgical and haemostatic techniques in tonsil surgery in three countries. DESIGN: Non-randomised, prospective, observational cohort. SETTING: All patients registered in the National Tonsil Surgery Quality Registers in Sweden, Norway and West Jutland, Denmark. PARTICIPANTS: Data were retrieved from 2017 to 2019; registered surgeries: Sweden: 20 833; Norway: 10 294 and West Jutland, Denmark: 505. RESULTS: Tonsil surgery for obstruction was twice as common in Sweden (62.2%) compared with Norway (31%) and Denmark (27.7%). Recurrent tonsillitis was registered twice as frequently in Norway (35.7%) and Denmark (39%) compared with Sweden (16.7%). Chronic tonsillitis was registered more frequently in Norway (29.8%) than in Sweden (13.8%) and Denmark (12.7%). Day surgery (>76%) was comparable. The higher frequency of obstruction in Sweden affected age and gender distributions: Sweden (7 years, 50.4% boys), Norway (17 y, 42.1%) and Denmark (19 y, 38.4%). For obstructive disorders, tonsillotomy with adenoidectomy was used in a majority of Swedish children (72%), whereas tonsillectomy with or without adenoidectomy dominated in Norway (53.5%) and Denmark (57.9%). Cold steel was the technique of choice for tonsillectomy in all three countries. For tonsillotomy, hot dissection techniques dominated in all countries. Disparities were observed with regard to haemostatic techniques. Bipolar diathermy was commonly used in all countries. Monopolar diathermy was practically only used in Sweden. Infiltration with epinephrine in the tonsillar bed was registered in Sweden and Norway but not at all in Denmark. Combined cold surgical and cold haemostatic techniques were more commonly used in Sweden (22.7%) than in Norway (10.4%) and Denmark (6.2%). CONCLUSIONS: This study demonstrates disparities among the Nordic countries in tonsil surgery in terms of indications plus surgical and haemostatic techniques. Increased coverage and further monitoring of outcomes is needed to identify best practices and ideal guidelines for improved care.

Practice, complications and outcome in Swedish tonsil surgery 2009-2018. An observational longitudinal national cohort study.

Background: To assure a high quality in tonsil surgery, it is necessary to monitor trends in clinical practice, complications and outcome.Aims/objectives: To describe rates and trends regarding indications, methods, techniques, complications, and outcome of tonsil surgery.Material and method: 98 979 surgeries from the National Tonsil Surgery Register 2009-2018. Groups were categorised by indication and method.Results: The proportion of patients undergoing tonsillotomy with adenoidectomy due to obstruction-snoring (mean age 5.3 y.) increased from 2009-2018. Hot tonsillectomy, but not tonsillotomy, techniques were related to a higher risk for postoperative bleeding. The use of cold techniques increased for all types of surgeries. The rates of patients reporting contact due to postoperative pain were associated with indication and method, with the lowest rate reported for tonsillotomy (4.5% in 2018) and the highest for tonsillectomy (34.5% in 2009). The rate of patients reporting that their symptoms were gone 6 months after surgery decreased.Conclusions and significance: All hot tonsillectomy techniques should be avoided as they are related to a higher risk for postoperative bleeding. The high rate of postoperative contacts due to pain after tonsillectomy indicates a need for improvement in pain management. The declining rates of symptom relief must be investigated further.

Does tonsillectomy reduce medical care visits for pharyngitis/tonsillitis in children and adults? Retrospective cohort study from Sweden.

OBJECTIVE: To assess the effectiveness of tonsillectomy/adenotonsillectomy in reducing medical care visits for pharyngitis or tonsillitis in children and adults with chronic/recurrent tonsillitis. DESIGN: Retrospective cohort study. SETTING: Data were retrieved from the VEGA register, a comprehensive regional cohort in Sweden. PARTICIPANTS: 1044 children (<15 years) and 2244 adults. INTERVENTION: Tonsillectomy/adenotonsillectomy compared with no surgical treatment. MAIN OUTCOME MEASURES: Changes in yearly mean rates of medical care visits due to pharyngitis/tonsillitis. RESULTS: In children, there was a significant decrease in the yearly mean medical care visits rate from 1.93 (1.82 to 2.04) before surgery to 0.129 (0.099 to 0.165) after surgery, with a mean change of -1.80 (-1.90 to -1.69), p<0.0001. In patients who did not undergo surgery, the corresponding mean change was -1.51 (-1.61 to -1.41), resulting in a mean difference in the change in visit rates between the intervention and control groups of -0.283 (-0.436 to -0.135), p=0.0002. In adults, a significant decrease in the yearly mean medical care visit rate was observed from 1.45 (1.39 to 1.51) before surgery to 0.152 (0.132 to 0.173) after surgery, with a mean change of -1.30 (-1.36 to -1.24), p<0.0001, compared with -1.18 (-1.24 to -1.13) in the control group. The difference in the change in yearly mean visit rate between the surgical and non-surgical groups was -0.111 (-0.195 to -0.028), p=0.0097. The subgroup analysis showed a greater effect of surgery in children, in patients with a higher number of medical care visits before surgery and in the first year of follow-up. CONCLUSION: In this cohort of patients moderately or less affected with chronic/recurrent tonsillitis, the effectiveness of tonsillectomy/adenotonsillectomy in reducing medical care visits for pharyngitis and tonsillitis compared with no surgical treatment was low and of questionable clinical value.

Providing quality data in health care - almost perfect inter-rater agreement in the Norwegian tonsil surgery register.

BACKGROUND: The Norwegian Tonsil Surgery Register (NTSR) was launched in January 2017. The purpose of the register is to present data on tonsil surgery to facilitate improvements in patient care. Data used for evaluating the quality of medical care needs to be of high reliability. This study aims to assess the inter-rater reliability (IRR) of the variables reported to the register by medical professionals. METHODS: The study population consists of the first 137 tonsil surgery patients who were included in the NTSR at St. Olav's University Hospital in Trondheim. An experienced rater completed the register's paper form for all 137 patients based on their electronic medical records, blinded for the data already in the register. To assess the inter-rater reliability between the register and the external rater, we calculated observed agreement, Cohen's kappa and Gwet's AC1 coefficients with 95% confidence intervals. RESULTS: All tested variables in the NTSR have almost perfect reliability except for the variable for the cold steel technique, which had a substantial to almost perfect reliability. The inter-rater agreement was substantial to almost perfect for every variable, with substantial (kappa/AC1 > 0.61) to almost perfect (kappa/AC1 > 0.81) agreement for all the examined variables. CONCLUSION: This study shows that the reliability of the NTSR is high for all variables registered by the professionals at the hospital immediately after surgery.

Morbidity after pediatric tonsillotomy versus tonsillectomy: A population-based cohort study.

OBJECTIVES/HYPOTHESIS: To compare and evaluate morbidity following pediatric tonsillectomy (TE) and tonsillotomy (TT) performed due to tonsil-related upper airway obstruction. STUDY DESIGN: Retrospective population-based cohort study based on data from the Swedish National Patient Register (NPR). METHODS: All patients aged 1 to 12 years who were registered in the NPR between January 1, 2007 and December 31, 2015, and who underwent an isolated tonsil surgery (± adenoidectomy) for the sole indication of upper airway obstruction were included. Postoperative morbidity within 30 days of surgery, including readmission due to hemorrhage and return to theater (RTT), was evaluated and compared between the two groups. A forward stepwise multivariable logistic regression analysis was used to identify independent predictors of postoperative morbidity. RESULTS: In total, 35,060 patients were included in the study, 23,447 of whom underwent TT and 11,613 of whom underwent TE. Readmission due to postoperative hemorrhage, RTT, readmission due to any reason, and contact with healthcare were all less common after TT than after TE. Readmission due to postoperative hemorrhage was significantly more common after TE (2.5%) than after TT (0.6%) (odds ratio: 3.91, 95% confidence interval: 3.20-4.77). CONCLUSIONS: This study showed that TT is associated with a statistically significantly lower risk of postoperative complications than TE when performed in children to correct tonsil-related upper airway obstruction. Statistically significant differences were found for all outcome variables, namely, readmission to hospital due to bleeding, RTT, readmission due to any reason, and postoperative contact with healthcare for any reason. LEVEL OF EVIDENCE: 2b Laryngoscope, 129:2619-2626, 2019.

Reducing post-tonsillectomy haemorrhage rates through a quality improvement project using a Swedish National quality register: a case study.

PURPOSE: Tonsillectomy (TE) is one of the most frequently performed ENT surgical procedures. Post-tonsillectomy haemorrhage (PTH) is a potentially life-threatening complication of TE. The National Tonsil Surgery Register in Sweden (NTSRS) has revealed wide variations in PTH rates among Swedish ENT centres. In 2013, the steering committee of the NTSRS, therefore, initiated a quality improvement project (QIP) to decrease the PTH incidence. The aim of the present study was to describe and evaluate the multicentre QIP initiated to decrease PTH rates. METHODS: Six ENT centres, all with PTH rates above the Swedish average, participated in the 7-month quality improvement project. Each centre developed improvement plans describing the intended changes in clinical practice. The project's primary outcome variable was the PTH rate. Process indicators, such as surgical technique, were also documented. Data from the QIP centres were compared with a control group of 15 surgical centres in Sweden with similarly high PTH rates. Data from both groups for the 12 months prior to the start of the QIP were compared with data for the 12 months after the QIP. RESULTS: The QIP centres reduced the PTH rate from 12.7 to 7.1% from pre-QIP to follow-up; in the control group, the PTH rate remained unchanged. The QIP centres also exhibited positive changes in related key process indicators, i.e., increasing the use of cold techniques for dissection and haemostasis. CONCLUSIONS: The rates of PTH can be reduced with a QIP. A national quality register can be used not only to identify areas for improvement but also to evaluate the impact of subsequent improvement efforts and thereby guide professional development and enhance patient outcomes.

Systematic review of tonsil surgery quality registers and introduction of the Nordic Tonsil Surgery Register Collaboration.

PURPOSE: Surgical quality registers provide tools to measure and improve the outcome of surgery. International register collaboration creates an opportunity to assess and critically evaluate national practices, and increases the size of available datasets. Even though millions of yearly tonsillectomies and tonsillotomies are performed worldwide, clinical practices are variable and inconsistency of evidence regarding the best clinical practice exists. The need for quality improvement actions is evident. We aimed to systematically investigate the existing tonsil surgery quality registers found in the literature, and to provide a thorough presentation of the planned Nordic Tonsil Surgery Register Collaboration. METHODS: A systematic literature search of MEDLINE and EMBASE databases (from January 1990 to December 2016) was conducted to identify registers, databases, quality improvement programs or comprehensive audit programs addressing tonsil surgery. RESULTS: We identified two active registers and three completed audit programs focusing on tonsil surgery quality registration. Recorded variables were fairly similar, but considerable variation in coverage, number of operations included and length of time period for inclusion was discovered. CONCLUSION: Considering tonsillectomies and tonsillotomies being among the most commonly performed surgical procedures in otorhinolaryngology, it is surprising that only two active registers could be identified. We present a Nordic Tonsil Surgery Register Collaboration-an international tonsil surgery quality register project aiming to provide accurate benchmarks and enhance the quality of tonsil surgery in Denmark, Finland, Norway and Sweden.

Increasing Readmission Rates for Hemorrhage after Tonsil Surgery: A Longitudinal (26 Years) National Study.

Objective To investigate the readmission rates due to postoperative hemorrhage in relation to tonsil surgery clinical practice in a national population. Study Design Retrospective longitudinal population-based cohort study. Setting Based on register data from the Swedish National Patient Register (NPR). Subjects and Methods All benign tonsil operations (256 053) performed in Sweden from 1987 to 2013 were identified through a search in the NPR. For all identified cases, data on gender, age, date of surgery, indication, type of surgery, level of care, length of stay (LOS) for inpatient surgery, readmission and reoperation because of postoperative bleeding (within 31 days) were collected. Results Overall frequency of readmission for hemorrhage was 2.61%, and the reoperation rate for hemostasis was 0.84%. The longitudinal analysis showed an increase from 1% (1987) to 5% (2013) in readmissions caused by hemorrhage. Tonsillectomies, surgery performed for infectious disease, and surgery on adult patients (age >18 years) showed readmission rates approaching 10% (2013). Male gender, increasing age, tonsillectomy, infectious indication, and recent year of surgery were identified as risk factors for readmission and reoperation due to hemorrhage. An increasing share of patients readmitted for hemorrhage underwent reoperation for hemostasis: 18% (1987) versus 43% (2013). Conclusion Readmissions for hemorrhage have increased by a factor of 5 in Sweden from 1987 to 2013. The design of the study and the data in NPR do not allow determination of the true reasons behind the alarming results.

Patient reported pain-related outcome measures after tonsil surgery: an analysis of 32,225 children from the National Tonsil Surgery Register in Sweden 2009-2016.

The objective of this study was to describe factors affecting pain after pediatric tonsil surgery, using patient reported pain-related outcome measures (pain-PROMs) from the National Tonsil Surgery Register in Sweden. In total, 32,225 tonsil surgeries on children (1 to <18 years) during 2009-2016 were included; 13,904 tonsillectomies with or without adenoidectomy (TE ± A), and 18,321 tonsillotomies with or without adenoidectomy (TT ± A). Adjustments were made for variables included in the register to compensate for contributable factors in the analysis. When compared to TE ± A for surgical indication obstruction, TT ± A resulted in lower pain-PROMs, shorter use of postoperative analgesics, earlier return to regular food intake, and lower risk for contact with health care services due to pain. Children who underwent TE ± A because of obstruction problems stopped taking painkillers and returned to normal eating habits sooner, compared to children who underwent TE ± A for infectious indications. In both indication groups, TE ± A performed with hot rather than cold technique (dissection and haemostasis) generally resulted in higher pain-PROMs. Older children reported more days on analgesics and a later return to regular food intake after TE ± A than younger ones. No clinically relevant difference between sexes was found. Between 2012 and 2016 (pre-and post-implementation of Swedish national guidelines for pain treatment), the mean duration of postoperative analgesic use had increased. In conclusion, TE ± A caused considerably higher ratings of pain-related outcome measures, compared to TT ± A. For TE ± A, cold surgical techniques (dissection and haemostasis) were superior to hot techniques in terms of pain-PROMs. Older children reported higher pain-PROMs after TE ± A than younger ones.

Tonsil surgery in Sweden 2013-2015. Indications, surgical methods and patient-reported outcomes from the National Tonsil Surgery Register.

AIM: To describes how tonsil surgery was performed in Sweden from 2013 to 2015 with data from the National Tonsil Surgery Registry in Sweden (NTSRS). METHOD: The registry collects data from both professionals and patients through questionnaires. A total of 33,870 tonsil surgeries were analysed, comprising approximately 80% of all tonsil surgeries in Sweden from 2013 to 2015. RESULTS: The two most common procedures were tonsillectomy (41%) and tonsillotomy with adenoidectomy (38%). Tonsillectomy was most commonly performed to treat frequent tonsillitis, while the main indication for tonsil surgery with combined adenoidectomy and for tonsillotomy alone was upper airway obstruction. The most commonly used techniques were cold steel (70%) for tonsillectomy/adenotonsillectomy and radiofrequency (79%) for tonsillotomy/adenotonsillotomy. Ninety-five percent of patients reported symptom relief after 180 d. Day surgery was utilised in 70% of the surgeries. The rate of readmission due to post-tonsillectomy haemorrhage was 5.1%. Male patients more often underwent tonsil surgery at preschool ages due to upper airway obstruction; in comparison, female patients to a larger extent underwent surgery in their early teens because of previous infections. CONCLUSIONS: The NTSRS provides an opportunity to survey tonsil surgery in Sweden and to launch and follow up improvement programmes as desired.

Incidence of second surgery following pediatric adenotonsillar surgery: a population-based cohort study.

The aim of the study is to evaluate the incidence and risk factors of a second surgery of the adenoids or tonsils for hypertrophy in children who have already undergone surgery for the same condition. This is a retrospective study (2004-2013) based on data from the National patient registry in Sweden. A total of 41,401 children underwent a first surgery of the adenoids or tonsils during the studied period. The most commonly performed (first) surgical procedure was adenoidectomy followed by adenotonsillotomy, adenotonsillectomy, tonsillotomy, and tonsillectomy. A total of 4459 patients underwent a second surgery for the same condition. The incidence of a second surgery was the highest in the primary adenoidectomy group (72.2, 95% CI 69.7-74.7) and lowest in the primary adenotonsillectomy group (14.2, 95% CI 12.6-15.9). A lower age at first surgery significantly increased the risk for a second surgery. A second surgery of the adenoids and tonsils due to lymphoid hypertrophy was common in the pediatric population. Adenoidectomy stands out in a negative way in most aspects of this study compared to the other types of first surgery. However, due to the design of this study, the results of this study cannot be taken as proof of a full adenotonsillectomy as the most appropriate first surgery in children with lymphoid upper airway obstruction. Nevertheless, the results clearly show that the topic needs to be addressed in future studies.

Trends and changes in paediatric tonsil surgery in Sweden 1987-2013: a population-based cohort study.

OBJECTIVES: The objective of this study was to longitudinally describe the history of tonsil surgery in Swedish children and adolescents regarding incidence, indications for surgery, surgical methods and the age and gender distributions. SETTING: A retrospective longitudinal population-based cohort study based on register data from the Swedish National Patient Register (NPR) and population data from Statistics Sweden. PARTICIPANTS: All Swedish children 1-<18 years registered in the NPR with a tonsil surgery procedure 1987-2013. RESULTS: 167 894 tonsil surgeries were registered in the NPR 1987-2013. An increase in the total incidence rate was observed, from 22/10 000 person years in 1987 to 47/10 000 in 2013. The most marked increase was noted in children 1-3 years of age, increasing from 17 to 73/10 000 person years over the period. The proportion children with obstructive/sleep disordered breathing (SDB) indications increased from 42.4% in 1987 to 73.6% in 2013. Partial tonsillectomy, tonsillotomy (TT), increased since 1996 and in 2013 55.1% of all tonsil procedures were TTs. CONCLUSIONS: There have been considerable changes in clinical practice for tonsil surgery in Swedish children over the past few decades. Overall, a doubling in the total incidence rate was observed. This increase consisted mainly of an increase in surgical procedures due to obstructive/SDB indications, particularly among the youngest age group (1-3 years old). TT has gradually replaced tonsillectomy as the predominant method for tonsil surgery.

Stability, Survival, and Tolerability of an Auditory Osseointegrated Implant for Bone Conduction Hearing: Long-Term Follow-Up of a Randomized Controlled Trial.

OBJECTIVE: To compare implant stability, survival, and soft tissue reactions for a novel (test) and previous generation (control) percutaneous auditory osseointegrated implant for bone conduction hearing at long-term follow-up of 5 years. STUDY DESIGN: Single follow-up visit of a previously completed multicenter, randomized, controlled trial. PATIENTS: Fifty-seven of the 77 participants of a completed randomized controlled trial on a new auditory osseointegrated implant underwent a single follow-up visit 5 years after implantation, which comprised implant stability measurements and collection of Holgers scores. Additionally, implant survival was recorded for all 77 patients from the original trial. RESULTS: The test implant showed significantly higher implant stability quotient (ISQ) values compared with the control implant throughout the 5-year follow-up. Mean area under the curve of ISQ high from baseline to 5 years was 71.6 (standard deviation [SD] ±2.0) and 66.7 (SD ±3.4) for the test and control implant, respectively (p < 0.0001). For both implants, the mean ISQ value recorded at 5 years was higher compared with implantation (test group +2.03 [SD ±2.55, within group p < 0.0001] and control group +2.25 [SD ±4.95, within group p = 0.12]). No difference was noticed in increase from baseline between groups (p = 0.64). Furthermore, evaluation of soft tissue reactions continued to show superiority of the test implant. At the 5-year follow-up visit, one patient (2.5%) presented with a Holgers grade 2 in the test group, compared with four patients (23.5%) in the control group (p = 0.048); no patient presented with more severe soft tissue reactions. Excluding explantations, the survival rate was 95.8% for the test group and 95.0% for the control group. The corresponding rates including explantations were 93.9 and 90.0%. CONCLUSION: The test implant showed superiority in terms of higher mean ISQ values and less adverse soft tissue reactions, both at the single 5-year follow-up visit and during the complete follow-up. In addition, both implants showed an equally high implant survival.

Pediatric adenoid surgery in Sweden 2004-2013: Incidence, indications and concomitant surgical procedures.

OBJECTIVES: To describe the incidence and indications of adenoid surgery and concomitantly performed ENT surgical procedures in a nationwide cohort covering several years of practice. METHODS: A retrospective study based on data from the National patient registry in Sweden. All children born from 1st of January 2004 to December 31st, 2013 who underwent adenoidectomy for the first time in Sweden during 2004-2013 were included in the study. Patient characteristics (age and gender), indications for surgery and performed ENT surgery were evaluated. RESULTS: 40,829 children underwent adenoid surgery during the studied period. Of these, 24,537 (60%) were boys. Mean and median age at surgery in the studied population was 4 years and 3.5 years respectively for both boys and girls. The most frequently performed surgical procedure was adenotonsillar surgery 43% (n = 17,434) followed by solitary adenoid surgery 26% (n = 10,749). The most frequent registered indication was hypertrophy 60% (n = 24,422) followed by hypertrophy and otitis media 21% (n = 8425). The highest age related incidence for all types of adenoid surgery taken together was 2-4 years of age for both genders. Boys had higher incidence rates than girls for all ages and all types of surgery except at eight years of age. CONCLUSIONS: The main findings were that adenoidectomy most commonly was performed together with surgery of the tonsils on the indication hypertrophy, that adenoid- and adenoid related ENT surgery were most commonly performed between 2 and 5 years of age and that the incidence in surgical rates was higher for boys than girls. There seem to be large unwarranted variations between countries regarding incidence rates and we believe that there is a need for further studies in order to establish recommendations for best practice regarding adenoid and related ENT surgeries.

Factors influencing morbidity after paediatric tonsillectomy: a study of 18,712 patients in the National Tonsil Surgery Register in Sweden.

The objective of this study was to examine factors affecting morbidity after tonsillectomy in children. Data from the National Tonsil Surgery Register in Sweden on 18,712 patients who underwent tonsillectomy with or without simultaneous adenoidectomy between 1 and 18 years of age were analysed. This register includes data on sex, gender, surgical indication, and the surgical and haemostasis techniques used for each patient, as well as patient-reported outcomes for haemorrhage, analgesic use and antibiotic use. Comparison of patients who underwent surgery for infection versus upper airway obstruction revealed a significant increase in haemorrhage complications in the infection group. However, no significant difference remained after the adjustments for confounders in multivariable regression analysis. Instead, the increased risk among patients who underwent surgery for infection was mainly attributable to the use of bipolar diathermy and increased patient age. Patients who received surgery for infection reported more days of analgesic use, as well as more unplanned contacts with a health care service provider due to pain, compared with those who underwent surgery for upper airway obstruction. These results remained significant in multivariate analysis. The use of bipolar diathermy for haemostasis resulted in an increased risk, while the use of cold steel surgical instruments, a younger patient age and female sex led to a decreased risk. The surgical and haemostasis techniques used are the most important factors that affect morbidity after tonsillectomy in the paediatric age group. The choice of surgical techniques is of utmost importance for decreasing morbidity in these patients.

Risk of reoperation after tonsillotomy versus tonsillectomy: a population-based cohort study.

Tonsil surgery to address upper airway obstruction in children can be performed either as a tonsillectomy (TE) or as a tonsillotomy/intracapsular/partial tonsillectomy (TT). The advantage of TT is a decreased risk of postoperative morbidity. The disadvantage is the risk of tonsil regrowth with recurrence of symptoms and/or problems with future tonsil infections, which may demand a reoperation of the tonsils. The aim of this study is to compare the risk of reoperation of the tonsils following TE and TT in children with tonsil-related upper airway obstruction. This is a retrospective register-based cohort study of the Swedish National Patient Register. All children aged 1-12 years who underwent TE or TT from 2007 to 2012 for the main indication of upper airway obstruction were included in the study. The unique Personal Identity numbers were used to follow patients over time in the register and identify additional tonsil surgery. A total of 27,535 patients were included in the study, contributing 76,054 person-years of follow-up. A total of 684 patients (2.5 %) underwent a second tonsil surgery during follow-up. The incidences of reoperation were 1.94 per 1000 person-years in the TE group and 16.34 per 1000 person-years in the TT group. The risk for reoperation was seven times higher (HR 7.16) after TT compared to TE. Younger age was significantly associated with reoperation for both TE and TT and the difference in risk between TE and TT gradually decreased with time. The most common indication for reoperation after both TE and TT was "Upper airway obstruction".

Subperiosteal abscesses in acute mastoiditis in 115 Swedish children.

OBJECTIVES: To study the outcome of different surgical methods of treating subperiosteal abscesses resulting from acute mastoiditis. METHODS: Medical records for all children from a Swedish retrospective multicentre study, conducted between 1993 and 2007, with acute mastoiditis and subperiosteal abscess, but without predisposing diseases or other complications, were studied. A total of 115 children aged 0-16 years were identified. All patients had received intravenous antibiotics and most had undergone myringotomy. RESULTS: Thirty-three children had been treated with only minor interventions such as retroauricular needle aspiration and/or incision, while 67 had undergone mastoidectomy. Fifteen had undergone both needle aspiration and mastoidectomy. The group treated with needle aspiration/incision was compared with those treated with mastoidectomy. One of the few significant differences found between the groups was a longer hospital stay in the group that had undergone mastoidectomy. CONCLUSIONS: Retroauricular needle aspiration and/or incision combined with intravenous antibiotics and myringotomy was an effective first-line treatment for subperiosteal abscesses resulting from acute mastoiditis. In this retrospective study, no greater risk of further complications was seen in this group compared to the group in which mastoidectomy was performed.

Study of the feasible size of a bone conduction implant transducer in the temporal bone.

HYPOTHESIS: The aim was to assess the temporal bone volume to determine the suitable size and position of a bone conduction implant (BCI) transducer. BACKGROUND: A BCI transducer needs to be sufficiently small to fit in the mastoid portion of the temporal bone for a majority of patients. The anatomical geometry limits both the dimension of an implanted transducer and its positions in the temporal bone to provide a safe and simple surgery. METHODS: Computed tomography (CT) scans of temporal bones from 22 subjects were virtually reconstructed. With an algorithm in MATLAB, the maximum transducer diameter as function of the maximum transducer depth in the temporal bone, and the most suitable position were calculated in all subjects. RESULTS: An implanted transducer diameter of 16 mm inserted at a depth of 4 mm statistically fitted 95% of the subjects. If changing the transducer diameter to 12 mm, a depth of 6 mm would fit in 95% of the subjects. The most suitable position was found to be around 20 mm behind the ear canal. CONCLUSION: The present BCI transducer casing, used in ongoing clinical trials, was designed from the results in this study, demonstrating that the present BCI transducer casing (largest diameter [diagonal]: 15.5 mm, height: 6.4 mm) will statistically fit more than 95% of the subjects. Hence, the present BCI transducer is concluded to be sufficiently small to fit most normal-sized temporal bones and should be placed approximately 20 mm behind the ear canal.