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Thölix AM, Kössi J, Grönroos-Korhonen M, Harju J. Laparoscopic inguinal hernia repair with self-fixated meshes: a randomized controlled trial. Surg Endosc 2025; 39:2425-2435. [PMID: 39979619 PMCID: PMC11933136 DOI: 10.1007/s00464-025-11616-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2024] [Accepted: 02/08/2025] [Indexed: 02/22/2025]
Abstract
BACKGROUND Laparoscopic inguinal hernia surgery leads to rapid recovery and low complication rates. An alternative to fixate the mesh is using a self-fixated mesh. METHODS From April 2021 to June 2024, we conducted a randomized controlled trial comparing self-adhesive mesh (Adhesix™) with self-gripping mesh (Progrip™) in laparoscopic inguinal hernia surgery (TAPP and TEP). Adult patients scheduled for day surgery were included in the study with a 1-year follow up. The primary endpoint was the number of analgesics (Paracetamol or Ibuprofen) used during the first post-operative week. Secondary outcomes were pain-related issues, complications, and recurrence rate. RESULTS A total of 174 patients participated; 90 received Adhesix™ (group A) and 84 Progrip™ (Group P). Forty-six (26.4%) patients had recurrent hernia, 68 (39.1%) had unilateral and 60 (34.5%) had bilateral primary hernias. A total of 156 (90%) patients completed follow up. The number of analgesics during the first post-operative week was comparable between groups (P 22.9, A 21.2 tablets, p = 0.461). Group P used more analgesics during day 1, after which no difference was observed. In general, all participants used analgesics after surgery regularly for 10.8 days (SD 10.6) and occasionally for 15.9 days (SD 16.9). Time to return to work and normal activities was 16.1 days (SD 10.8) and 16.6 days (SD 9.6), respectively. More patients in group P reported moderate or severe pain (numeric rating scale > 3) during exercise 3 months after surgery (P 15.4%, A 3.1%, p = 0.035), although no difference was observed at 1 year after surgery. Both groups had significantly improved quality of life measures in physical aspects of the RAND-36 Item Health Survey after 3 months. Two recurrences, one in each group (1.1%) occurred. CONCLUSION The use of Adhesix was non-inferior to Progrip in laparoscopic surgery. Surgery using either mesh led to rapid recovery and improved quality of life. This trial was registered in ClinicalTrials.gov (NCT05091853).
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Affiliation(s)
- Anna-Maria Thölix
- Department of Abdominal Surgery, University of Helsinki and Helsinki University Hospital, Helsinki, Finland.
| | - Jyrki Kössi
- Department of Surgery, Päijät-Häme Central Hospital, Lahti, Finland
| | - Marie Grönroos-Korhonen
- Department of Abdominal Surgery, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
- Department of Surgery, Päijät-Häme Central Hospital, Lahti, Finland
| | - Jukka Harju
- Department of Abdominal Surgery, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
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Mainprize M, Spencer Netto FAC, Svendrovski A, Mantke R, Paasch C. Quality of life following Shouldice Repair: a prospective cohort study among inguinal hernia patients. Hernia 2024; 29:28. [PMID: 39580600 DOI: 10.1007/s10029-024-03217-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2024] [Accepted: 11/10/2024] [Indexed: 11/25/2024]
Abstract
PURPOSE The aim of this study was to evaluate quality of life from the preoperative time to six months after surgery of patients who underwent a Shouldice Repair for primary inguinal hernia. METHODS After ethical approval, consent was obtained, and data collected from surveys and chart review. The study population was composed of male and female patients aged 16-90 years of age, who had a Shouldice Repair of a primary unilateral inguinal hernia. The EQ-5D-3L, a questionnaire applied to hernia surgery in Canada, was used to determine quality of life at the preoperative and 1 week, 1- and 6-month postoperative time. Data analysis included descriptive statistics, as well as inferential analysis. RESULTS From January 2023 to February 2024, 532 participants met the criteria, completed and returned the preoperative survey, and underwent primary inguinal hernia repair. The participants were mostly male (94%) with an average age of 62.18 years and BMI of 24.93 kg/m2. The EQ-5D-3L health index scores and EQ-VAS health status at preoperative were 0.83 ± 0.13 and 79.5 ± 12.59. At the 1-month postoperative time, health index scores and health status had significantly increased from preoperative (score:0.91 ± 0.12, p = .001; status 83.56 ± 12.93, p = .001), and continued to significantly increase from baseline at the 6-month postoperative time (score:0.95 ± 0.10, p = .001; status:85.25 ± 12.17, p < .001). CONCLUSION Quality of life, as measured by the ED-5D-3L health index score, significantly improved for patients that underwent a Shouldice Repair for an inguinal hernia.
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Affiliation(s)
- Marguerite Mainprize
- Department of Surgery, Shouldice Hospital, 7750 Bayview Ave. Thornhill, Ontario, ON, L3T 4A3, Canada.
- Department of General Surgery, University Hospital Brandenburg an Der Havel, Brandenburg Medical School Theodor Fontane, Brandenburg, Germany.
| | | | | | - Rene Mantke
- Department of General Surgery, University Hospital Brandenburg an Der Havel, Brandenburg Medical School Theodor Fontane, Brandenburg, Germany
| | - Christoph Paasch
- Department of Surgery, Shouldice Hospital, 7750 Bayview Ave. Thornhill, Ontario, ON, L3T 4A3, Canada
- Department of General Surgery, University Hospital Brandenburg an Der Havel, Brandenburg Medical School Theodor Fontane, Brandenburg, Germany
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Mainprize M, Yilbas A, Spencer Netto FAC, Svendrovski A, Katz J. Incidence of opioid use and early postoperative pain intensity after primary unilateral inguinal hernia repair at a single-center specialty hospital. Langenbecks Arch Surg 2023; 408:366. [PMID: 37726600 DOI: 10.1007/s00423-023-03111-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Accepted: 09/14/2023] [Indexed: 09/21/2023]
Abstract
PURPOSE This research examined opioid use, pain intensity, and pain management after primary unilateral inguinal hernia repair (PUIHR) at a single-center specialty hospital. METHODS After research, ethics board approval, and informed consent, pain scores (0-10 numerical rating scale [NRS]) were obtained from survey-based questionnaires administered at the pre- and 3-day postoperative timepoints. Descriptive results are presented as frequency, mean, standard deviation, range, median, and interquartile ranges, as appropriate. Significance tests were conducted to compare participants who did and did not receive opioids after surgery. p-value <0.05 is considered statistically significant. As the standard of care, participants received nonopioid multimodal analgesia (acetaminophen and nonsteroidal anti-inflammatory drugs (NSAIDs)) and opioids, when necessary. RESULTS A total of 414 and 331 participants completed the pre- and 3-day postoperative questionnaires, respectively. Out of the 414 participants, 38 (9.2%) received opioids during the postoperative stay. There was no significant difference between pain frequency or mean preoperative NRS pain intensity scores of those who did and did not receive opioids. Mean NRS pain intensity scores on day 3 after surgery were significantly higher for participants who received opioids (3.15±2.08) than those who did not (2.19±1.95), p=0.005. CONCLUSION Most participants did not receive opioids after PUIHR and had lower mean postoperative NRS pain intensity scores compared to those who did, most likely reflecting the need for opioids among the latter. Opioids were discontinued by day 3 for all participants who received them. Therefore, for most patients undergoing PUIHR, effective pain control can be achieved with nonopioid multimodal analgesia in the early postoperative period.
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Affiliation(s)
| | - Ayse Yilbas
- Department of Surgery, Shouldice Hospital, ON, Canada
| | | | | | - Joel Katz
- Department of Psychology, York University, ON, Canada
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Grieve R, Hutchings A, Moler Zapata S, O’Neill S, Lugo-Palacios DG, Silverwood R, Cromwell D, Kircheis T, Silver E, Snowdon C, Charlton P, Bellingan G, Moonesinghe R, Keele L, Smart N, Hinchliffe R. Clinical effectiveness and cost-effectiveness of emergency surgery for adult emergency hospital admissions with common acute gastrointestinal conditions: the ESORT study. HEALTH AND SOCIAL CARE DELIVERY RESEARCH 2023; 11:1-132. [DOI: 10.3310/czfl0619] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2025]
Abstract
Background
Evidence is required on the clinical effectiveness and cost-effectiveness of emergency surgery compared with non-emergency surgery strategies (including medical management, non-surgical procedures and elective surgery) for patients admitted to hospital with common acute gastrointestinal conditions.
Objectives
We aimed to evaluate the relative (1) clinical effectiveness of two strategies (i.e. emergency surgery vs. non-emergency surgery strategies) for five common acute conditions presenting as emergency admissions; (2) cost-effectiveness for five common acute conditions presenting as emergency admissions; and (3) clinical effectiveness and cost-effectiveness of the alternative strategies for specific patient subgroups.
Methods
The records of adults admitted as emergencies with acute appendicitis, cholelithiasis, diverticular disease, abdominal wall hernia or intestinal obstruction to 175 acute hospitals in England between 1 April 2010 and 31 December 2019 were extracted from Hospital Episode Statistics and linked to mortality data from the Office for National Statistics. Eligibility was determined using International Statistical Classification of Diseases and Related Health Problems, Tenth Revision, diagnosis codes, which were agreed by clinical panel consensus. Patients having emergency surgery were identified from Office of Population Censuses and Surveys procedure codes. The study addressed the potential for unmeasured confounding with an instrumental variable design. The instrumental variable was each hospital’s propensity to use emergency surgery compared with non-emergency surgery strategies. The primary outcome was the ‘number of days alive and out of hospital’ at 90 days. We reported the relative effectiveness of the alternative strategies overall, and for prespecified subgroups (i.e. age, number of comorbidities and frailty level). The cost-effectiveness analyses used resource use and mortality from the linked data to derive estimates of incremental costs, quality-adjusted life-years and incremental net monetary benefits at 1 year.
Results
Cohort sizes were as follows: 268,144 admissions with appendicitis, 240,977 admissions with cholelithiasis, 138,869 admissions with diverticular disease, 106,432 admissions with a hernia and 133,073 admissions with an intestinal obstruction. Overall, at 1 year, the average number of days alive and out of hospitals at 90 days, costs and quality-adjusted life-years were similar following either strategy, after adjusting for confounding. For each of the five conditions, overall, the 95% confidence intervals (CIs) around the incremental net monetary benefit estimates all included zero. For patients with severe frailty, emergency surgery led to a reduced number of days alive and out of hospital and was not cost-effective compared with non-emergency surgery, with incremental net monetary benefit estimates of –£18,727 (95% CI –£23,900 to –£13,600) for appendicitis, –£7700 (95% CI –£13,000 to –£2370) for cholelithiasis, –£9230 (95% CI –£24,300 to £5860) for diverticular disease, –£16,600 (95% CI –£21,100 to –£12,000) for hernias and –£19,300 (95% CI –£25,600 to –£13,000) for intestinal obstructions. For patients who were ‘fit’, emergency surgery was relatively cost-effective, with estimated incremental net monetary benefit estimates of £5180 (95% CI £684 to £9680) for diverticular disease, £2040 (95% CI £996 to £3090) for hernias, £7850 (95% CI £5020 to £10,700) for intestinal obstructions, £369 (95% CI –£728 to £1460) for appendicitis and £718 (95% CI £294 to £1140) for cholelithiasis. Public and patient involvement translation workshop participants emphasised that these findings should be made widely available to inform future decisions about surgery.
Limitations
The instrumental variable approach did not eliminate the risk of confounding, and the acute hospital perspective excluded costs to other providers.
Conclusions
Neither strategy was more cost-effective overall. For patients with severe frailty, non-emergency surgery strategies were relatively cost-effective. For patients who were fit, emergency surgery was more cost-effective.
Future work
For patients with multiple long-term conditions, further research is required to assess the benefits and costs of emergency surgery.
Study registration
This study is registered as reviewregistry784.
Funding
This project was funded by the National Institute for Health and Care Research (IHR) Health and Social Care Delivery Research programme and will be published in full in Health and Social Care Delivery Research; Vol. 11, No. 1. See the NIHR Journals Library website for further project information.
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Affiliation(s)
- Richard Grieve
- Department of Health Services Research and Policy, London School of Hygiene & Tropical Medicine, London, UK
| | - Andrew Hutchings
- Department of Health Services Research and Policy, London School of Hygiene & Tropical Medicine, London, UK
| | - Silvia Moler Zapata
- Department of Health Services Research and Policy, London School of Hygiene & Tropical Medicine, London, UK
| | - Stephen O’Neill
- Department of Health Services Research and Policy, London School of Hygiene & Tropical Medicine, London, UK
| | - David G Lugo-Palacios
- Department of Health Services Research and Policy, London School of Hygiene & Tropical Medicine, London, UK
| | | | - David Cromwell
- Department of Health Services Research and Policy, London School of Hygiene & Tropical Medicine, London, UK
| | - Tommaso Kircheis
- Department of Health Services Research and Policy, London School of Hygiene & Tropical Medicine, London, UK
| | | | - Claire Snowdon
- Department for Medical Statistics, London School of Hygiene & Tropical Medicine, London, UK
| | - Paul Charlton
- Patient ambassador, National Institute for Health and Care Research, Southampton, UK
| | - Geoff Bellingan
- Intensive Care Medicine, University College London, London, UK
- NIHR Biomedical Research Centre at University College London Hospitals NHS Foundation Trust and University College London, London, UK
| | - Ramani Moonesinghe
- Centre for Perioperative Medicine, University College London Hospitals, London, UK
| | - Luke Keele
- Department of Surgery, University of Pennsylvania, Philadelphia, PA, USA
| | - Neil Smart
- College of Medicine and Health, University of Exeter, Exeter, UK
| | - Robert Hinchliffe
- NIHR Bristol Biomedical Research Centre, University of Bristol, Bristol, UK
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Lozada-Martinez ID, Covaleda-Vargas JE, Gallo-Tafur YA, Mejía-Osorio DA, González-Pinilla AM, Florez-Fajardo MA, Benavides-Trucco FE, Santodomingo-Rojas JC, Julieth Bueno-Prato NK, Narvaez-Rojas AR. Pre-operative factors associated with short- and long-term outcomes in the patient with inguinal hernia: What does the current evidence say? Ann Med Surg (Lond) 2022; 78:103953. [PMID: 35734704 PMCID: PMC9207143 DOI: 10.1016/j.amsu.2022.103953] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Revised: 06/02/2022] [Accepted: 06/03/2022] [Indexed: 11/24/2022] Open
Abstract
Hernia repair is one of the most frequent interventions in surgery worldwide. The approach to abdominal wall and inguinal hernias remains a challenge due to emerging evidence on aspects such as timely diagnosis, use of innovative techniques or post-surgical care. However, pre-operative preparation is also a factor that substantially affects the absolute success rate of this type of condition. Time management between diagnosis and intervention, control of diseases that increase intra-abdominal pressure, weight and nutritional status, are some of the many elements to be considered in this type of patients before surgery. Considering that this condition carries high health care costs, especially in case of recurrence, has a risk of complications and affects the individual's functional capacity, the objective of this review is to synthesize evidence on the role of these factors on the short- and long-term outcome of inguinal hernia management, and to make suggestions on the general approach to this type of patients.
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Affiliation(s)
- Ivan David Lozada-Martinez
- Medical and Surgical Research Center, Future Surgeons Chapter, Colombian Surgery Association, Bogotá, Colombia
- Grupo Prometheus y Biomedicina Aplicada a Las Ciencias Clínicas, School of Medicine, Universidad de Cartagena, Cartagena, Colombia
| | | | | | | | | | | | | | | | | | - Alexis Rafael Narvaez-Rojas
- Department of Surgery, Hospital Carlos Roberto Huembes, Universidad Nacional Autonoma de, Nicaragua, Managua, Nicaragua
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Croghan SM, Fleming CA, Mohan HM, Harji D, Bolger JC, Elliott JA, Boland M, Lonergan PE, Dillon P, Quinlan DM, Winter DC. RETention of urine After INguinal hernia Elective Repair (RETAINER study I and II). Int J Surg Protoc 2021; 25:42-54. [PMID: 34013144 PMCID: PMC8114841 DOI: 10.29337/ijsp.137] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Purpose: Post-operative urinary retention (POUR) is a well-recognised complication of inguinal hernia repair (IHR). The magnitude of the problem is unclear, and contradictory evidence surrounds postulated risk factors. POUR risks patient distress, catheter-complications and a financial and logistical burden to services. Separately, in the field of IHR, there has been a lack of research into patients’ perceptions of surgical ‘success’. Our aim is to perform a two-phase, multi-centre prospective study to: Methods: RETAINER I: We propose a 24-week prospective study with voluntary international participation in 4 week blocks. All patients undergoing elective IH repair (minimally-invasive/open) will be eligible. Standardised data collection will include patient and perioperative factors. Primary outcome will be development of POUR, defined as the need for insertion of a urinary catheter as determined by the treating clinician. Secondary outcomes will be identification of factors predisposing to POUR and the impact of POUR. RETAINER II: A patient reported outcome measure will be developed using representative patient focus groups for item generation, from which an initial questionnaire will be developed and piloted. Validity, reliability, sensitivity and reproducibility will be assessed using the QQ-10 and standard psychometric methodology. Conclusions: Using an international multicentre collaborative approach will produce the necessary volume of patients, whilst capturing inter-centre variability, to accurately reflect POUR rates and allow analysis of risk factors. This patient pool will provide an excellent opportunity to develop a PROM using appropriate qualitative methodology. Highlights: RETAINER I & II Protocols
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Affiliation(s)
| | | | | | | | - Deena Harji
- Irish Surgical Research Collaborative (ISRC), IE
| | | | | | | | | | - Patrick Dillon
- Department of Anaesthesia, University Hospital Limerick, IE
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Longitudinal cohort study on preoperative pain as a risk factor for chronic postoperative inguinal pain after groin hernia repair at 2-year follow-up. Hernia 2021; 26:189-200. [PMID: 33891224 DOI: 10.1007/s10029-021-02404-w] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Accepted: 03/29/2021] [Indexed: 10/21/2022]
Abstract
PURPOSE To assess the rate of late chronic postoperative inguinal pain (CPIP) after groin hernia repair in patients with different categories of preoperative VRS (Verbal Rating Scale) pain and to make a pragmatic evaluation of the rates of potentially surgery-related CPIP vs. postoperative continuation of preexisting preoperative pain. METHODS Groin pain of patients operated from 01/11/2011 to 01/04/2014 was assessed preoperatively, postoperatively and at 2-year follow-up using a VRS-4 in 5670 consecutive groin hernia repairs. A PROM (Patient Related Outcomes Measurement) questionnaire studied the impact of CPIP on the patients' daily life. RESULTS Relevant (moderate or severe VRS) pain was registered preoperatively in 1639 of 5670 (29%) cases vs. 197 of 4704 (4.2%) cases at the 2-year follow-up. Among the latter, 125 (3.7%) cases were found in 3353 cases with no-relevant preoperative pain and 72 (5.3%) in 1351 cases with relevant preoperative pain. Relevant CPIP consisted of 179 (3.8%) cases of moderate pain and 18 (0.4%) cases of severe pain. The rate of severe CPIP was independent of the preoperative VRS-pain category while the rate of moderate CPIP (3.1%, 3.4%, 4.1%, 6.8%) increased in line with the preoperative (none, mild, moderate, and severe) VRS-pain categories. The VRS probably overestimated pain since 71.6% of the relevant CPIP patients assessed their pain as less bothersome than the hernia. CONCLUSION At the 2-year follow-up, relevant CPIP was registered in 4.2% cases, of which 63.5% were potentially surgery-related (no-relevant preoperative pain) and 36.5% possibly due to the postoperative persistence of preoperative pain. The rate of severe CPIP was constant around 0.4%.
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Ssentongo AE, Kwon EG, Zhou S, Ssentongo P, Soybel DI. Pain and Dysfunction with Sexual Activity after Inguinal Hernia Repair: Systematic Review and Meta-Analysis. J Am Coll Surg 2019; 230:237-250.e7. [PMID: 31733327 DOI: 10.1016/j.jamcollsurg.2019.10.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 10/22/2019] [Accepted: 10/22/2019] [Indexed: 11/28/2022]
Abstract
BACKGROUND The reported incidence rates of sexual dysfunction (SD) and pain with sexual activity (PSA) after inguinal hernia repair in males vary considerably. This meta-analysis explores the rates of SD and PSA after different surgical and anesthesia types to understand patient risk after inguinal hernia repair. STUDY DESIGN We performed a systematic review and meta-analysis using Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) guidelines to search 3 databases (EMBASE, MEDLINE, and Cochrane Library). We identified retrospective, prospective, and randomized controlled trial studies, published on or before March 1, 2019, reporting on SD and PSA after inguinal hernia repair. We used random-effects models to calculate pooled estimates of incidence rates of SD and PSA after inguinal hernia repair. Subgroup meta-analyses and meta-regression were used to explore sources of variation. RESULTS A total of 4,884 patients from 12 studies were identified. Study-level median age at the time of repair was 52.3 years old, and study-level median follow-up was 10.5 months. Definitions of SD and PSA focused on completion of intercourse for the former and pain with erection/ejaculation for the latter. The overall incidence of new-onset, postoperative SD was 5.3% (95% CI 3.6% to 7.9%) and of PSA was 9.0% (95% CI 5.8% to 13.6%). Rates of SD associated with minimally invasive surgical (MIS) and open repair were, respectively, 7.8% (95% CI 5.4% to 11.3%) and 3.7% (95% CI 2.0% to 6.8%); rates of PSA were 7.4% (95% CI 4.7% to 11.5%) and 12.5% (95% CI 6.4% to 23.3%), respectively. CONCLUSIONS Sexual dysfunction and PSA are not rare after inguinal hernia repair. They should be included in preoperative discussions and as standard metrics in reporting outcomes of repair in large cohorts or trials.
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Affiliation(s)
- Anna E Ssentongo
- Department of Surgery, Penn State Hershey College of Medicine and Milton S. Hershey Medical Center, Hershey, PA; Department of Public Health Sciences, Penn State Hershey College of Medicine and Milton S. Hershey Medical Center, Hershey, PA
| | - Eustina G Kwon
- Department of Surgery, Penn State Hershey College of Medicine and Milton S. Hershey Medical Center, Hershey, PA
| | - Shouhao Zhou
- Department of Public Health Sciences, Penn State Hershey College of Medicine and Milton S. Hershey Medical Center, Hershey, PA
| | - Paddy Ssentongo
- Department of Public Health Sciences, Penn State Hershey College of Medicine and Milton S. Hershey Medical Center, Hershey, PA; Center for Neural Engineering, Department of Engineering, Science and Mechanics, The Pennsylvania State University, University Park, PA
| | - David I Soybel
- Department of Surgery, Penn State Hershey College of Medicine and Milton S. Hershey Medical Center, Hershey, PA.
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