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Mo J, Maeng D, Hornbrook MC, Sun V, McCorkle RC, Weinstein RS, Krouse RS. A Bootstrap Method to Estimate Cost of Behavioral Intervention Implementation: A Proof of Concept. Health Serv Res 2025:e14608. [PMID: 40110768 DOI: 10.1111/1475-6773.14608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2024] [Revised: 11/01/2024] [Accepted: 02/27/2025] [Indexed: 03/22/2025] Open
Abstract
OBJECTIVE To develop a bootstrapping method to augment time-driven activity-based costing (TDABC) analysis intended to allow more realistic cost estimates. DATA SOURCES Secondary data from a multisite clinical trial conducted from 2016 to 2018 on an ostomy self-management telehealth intervention for cancer survivors. STUDY DESIGN The intervention cost was newly estimated by incorporating expected patient participation rates calculated via bootstrapping. This cost was compared against the cost estimate obtained via traditional TDABC. DATA COLLECTION Study personnel self-reported the time spent on each activity associated with the intervention. We also utilized patient participation data collected from the trial. PRINCIPAL FINDINGS The total cost of the telehealth intervention estimated via the bootstrapping method was $210,052.62 (95% CI: 208,652.13, 211,402.51), with an average cost per participant of $1981.63 (95% CI: 1968.42, 1994.36). Traditional TDABC analysis yielded $186,363 or $1758 per participant. Further adjusting assumptions about the cost of the postintervention monitoring phase, our approach yielded an alternative estimate of $176,362.56 (95% CI: 174,962.07, 177,712.45) and an average cost per participant of $1663.80 (95% CI: 1650.59, 1676.53) suggesting both methods yielded similar bottom-line results. CONCLUSIONS Incorporating bootstrapping into traditional TDABC methodology is feasible and is likely to capture variance in clinical trial data.
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Affiliation(s)
- Julia Mo
- Department of Medicine, University of Rochester Medical Center, Rochester, New York, USA
| | - Daniel Maeng
- Department of Psychiatry, University of Rochester Medical Center, Rochester, New York, USA
| | - Mark C Hornbrook
- Center for Health Research, Kaiser Permanente Northwest Region, Portland, Oregon, USA
| | - Virginia Sun
- Division of Nursing Research and Education, City of Hope, Duarte, California, USA
| | - Ruth C McCorkle
- School of Nursing, Yale University, West Haven, Connecticut, USA
| | - Ronald S Weinstein
- Arizona Telemedicine Program, University of Arizona, Tucson, Arizona, USA
| | - Robert S Krouse
- Department of Surgery, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
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Iovino P, Vellone E, Campoli A, Tufano C, Esposito MR, Guberti M, Bolgeo T, Sandroni C, Sili A, Manara DF, Alvaro R, Rasero L, Villa G. Telehealth vs in-person education for enhancing self-care of ostomy patients (Self-Stoma): Protocol for a noninferiority, randomized, open-label, controlled trial. PLoS One 2024; 19:e0303015. [PMID: 38924038 PMCID: PMC11206953 DOI: 10.1371/journal.pone.0303015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Accepted: 04/15/2024] [Indexed: 06/28/2024] Open
Abstract
INTRODUCTION Postoperative patients with ostomies experience significant changes in their lives as a result of the device implantation. Self-care is important to improve their health outcomes. Telehealth provides an opportunity to expand access to self-care education. AIM This is a multicenter, non-inferiority randomized, open-label, controlled trial to evaluate the non-inferiority of a telehealth intervention to the standard in-person approach in improving self-care behaviors. METHODS AND ANALYSIS Three hundred and eighty-four patients aged ≥ 18 years, with a recently placed ostomy, no stomal/peristomal complications, and documented cognitive integrity will be randomly assigned (1:1) to receive either a telehealth intervention (four remote educational sessions) or a standard educational approach (four in-person sessions) delivered in outpatient settings. Every session (remote and in-person) will occur on Days 25, 32, 40, and 60 after discharge. Follow-ups will occur 1, 3, and 6 months after the last intervention session. Primary outcome is self-care maintenance measured using the Ostomy Self-care Index (OSCI). Secondary outcomes include self-care monitoring, self-care management, self-efficacy (OSCI), quality of life (Stoma specific quality of Life), depression (Patient Health Questionnaire-9), adjustment (Ostomy Adjustment Inventory-23), stomal and peristomal complication rates, healthcare services utilization, mobility, and number of working days lost. Analyses will be performed per intention-to-treat and per protocol. ETHICS AND DISSEMINATION This study has been approved by the Institutional Review Board of the main center (registration number: 119/22). Following completion of the trial, dissemination meetings will be held to share the results of the study with the participants and the health-care team. Adoption of telehealth technologies for ostomy patients can improve service organization by ensuring better integration and continuity of care. If the remote intervention produces comparable effects to the in-person intervention, it would be wise to make telehealth education an alternative treatment for addressing the educational needs of uncomplicated postoperative ostomy patients. TRIAL REGISTRATION ClinicalTrials.gov (identifier number: NCT05796544).
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Affiliation(s)
- Paolo Iovino
- Department of Health Sciences, University of Florence, Florence, Italy
| | - Ercole Vellone
- Department of Biomedicine and Prevention University of Rome Tor Vergata, Rome, Italy
- Department of Nursing and Obstetrics, Wroclaw Medical University, Wroclaw, Poland
| | - Alessia Campoli
- Department of Biomedicine and Prevention University of Rome Tor Vergata, Rome, Italy
- Nursing, Technical, Rehabilitation, Assistance and Research Direction, IRCCS Istituti Fisioterapici Ospitalieri, IFO, Rome, Italy
| | | | | | - Monica Guberti
- Head of Research and EBP Unit, Health Professions Department, Azienda Unità Sanitaria Locale–IRCCS, Reggio Emilia, Italy
| | - Tatiana Bolgeo
- Department Attività Integrate Ricerca e Innovazione, Azienda Ospedaliera SS Antonio e Biagio e C. Arrigo, Alessandria, Italy
| | | | | | - Duilio Fiorenzo Manara
- Center for Nursing Research and Innovation, Vita-Salute San Raffaele University, Milan, Italy
| | - Rosaria Alvaro
- Department of Biomedicine and Prevention University of Rome Tor Vergata, Rome, Italy
| | - Laura Rasero
- Department of Health Sciences, University of Florence, Florence, Italy
| | - Giulia Villa
- Center for Nursing Research and Innovation, Vita-Salute San Raffaele University, Milan, Italy
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Hu J, Zhang X, Sun J, Hu H, Tang C, Ba L, Xu Q. Supportive Care Needs of Patients With Temporary Ostomy in Enhanced Recovery After Surgery: A Mixed-Methods Study. J Nurs Res 2024; 32:e329. [PMID: 38727228 DOI: 10.1097/jnr.0000000000000610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2024] Open
Abstract
BACKGROUND Enhanced recovery after surgery (ERAS), a global surgical quality improvement initiative, reduces the length of stay in the hospital. Temporary stoma care for rectal cancer is complex, and patients require prolonged care services to adjust to the stoma. The shorter stay durations in the new model challenge the conventional care pathways and create new patient needs. PURPOSE This study was designed to explore the supportive care needs of patients under the new surgical model to provide a reference for the design of ERAS nursing care plans. METHODS A convergent parallel mixed-methods design was used in this study. Patients with temporary stomas for rectal cancer were recruited using a convenience sampling method in gastrointestinal surgery wards and wound & stoma clinics in two public tertiary care hospitals in China. Standardized questionnaires were administered to 140 patients to collect quantitative data, and semistructured interviews were conducted individually with 13 patients to collect qualitative data. The questionnaire data were analyzed using descriptive statistics, and the interview data were analyzed using thematic analysis. RESULTS "Health system and information needs" and "care and support needs" were identified in both the qualitative and quantitative analyses as the most significant unmet needs of the participants. In addition, the qualitative analysis identified receiving focused stoma care instructions and easily understandable information as essential to fulfilling health system and information needs. Care and support needs included access to continued postdischarge services and attention from medical professionals. CONCLUSION/IMPLICATIONS FOR PRACTICE The participants in this study experienced a variety of unmet supportive care needs under the ERAS protocol, with gaps particularly notable in two categories: "health system and information needs" and "care and support needs." Increased perioperative care and shorter hospital stays under the ERAS protocol reduce opportunities for patients to receive targeted instruction and shift much of the ostomy education and care workload out of the hospital, requiring greater attention from clinical nurses to ensure quality of care.
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Affiliation(s)
- Jieman Hu
- PhD, RN, Lecturer, School of Nursing, Nanjing Medical University, Nanjing, China
| | - Xiuling Zhang
- BSN, RN, Department of Gastrointestinal Colorectal and Anal Surgery, China-Japan Union Hospital of Jilin University, Changchun, China
| | - Jianan Sun
- MS, RN, Department of Gastrointestinal Colorectal and Anal Surgery, The First Hospital of Jilin University, Changchun, China
| | - Haiyan Hu
- BSN, RN, Head Nurse, Department of Gastrointestinal Colorectal and Anal Surgery, The First Hospital of Jilin University, Changchun, China
| | - Chulei Tang
- PhD, RN, Lecturer, School of Nursing, Nanjing Medical University, Nanjing, China
| | - Lei Ba
- PhD, Associate Professor, National Health Commission Contraceptives Adverse Reaction Surveillance Center, Jiangsu Health Development Research Center, Nanjing, China
| | - Qin Xu
- MS, RN, Professor, School of Nursing, Nanjing Medical University, Nanjing, China
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Krouse RS, Zhang S, Wendel CS, Sun V, Grant M, Ercolano E, Hornbrook MC, Cidav Z, Nehemiah A, Rock M, Appel S, Hibbard JH, Holcomb MJ. A randomized prospective trial of an ostomy telehealth intervention for cancer survivors. Cancer 2024; 130:618-635. [PMID: 37905783 DOI: 10.1002/cncr.35091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 10/04/2023] [Accepted: 10/05/2023] [Indexed: 11/02/2023]
Abstract
BACKGROUND Cancer survivors with ostomies face complex challenges. This study compared the Ostomy Self-Management Telehealth program (OSMT) versus attention control usual care (UC). METHODS Three academic centers randomized participants. OSMT group sessions were led by ostomy nurses and peer ostomates (three for ostomates-only, one for support persons, and one review session for both). Surveys at baseline, OSMT completion, and 6 months were primary outcome patient activation (PAM), self-efficacy (SE), City of Hope quality of life-Ostomy (COH-O), and Hospital Anxiety and Depression Scale (HADS). Surveys were scored per guidelines for those completing at least two surveys. Linear mixed effects models were used to select potential covariates for the final model and to test the impact of OSMT within each timeframe. RESULTS A total of 90 OSMT and 101 UC fulfilled analysis criteria. Arms were well-matched but types of tumors were unevenly distributed (p = .023). The OSMT arm had a nonsignificant improvement in PAM (confidence interval [CI], -3.65 to 5.3]; 4.0 vs. 2.9) at 6 months. There were no significant differences in other surveys. There was a significant OSMT benefit for urinary tumors (four SE domains). Higher OSMT session attendance was associated with post-session improvements in five SE domains (p < .05), two COH-O domains (p < .05), and HADS anxiety (p = .01). At 6 months, there remained improvements in one SE domain (p < .05), one COH-O domain (p < .05), and HADS anxiety (p < .01). CONCLUSIONS No clear benefit was seen for the OSMT intervention, although there may be an advantage based on type of tumor. Benefit with greater session attendance was also encouraging. PLAIN LANGUAGE SUMMARY Cancer patients with ostomies have many challenges. We tested a telehealth curriculum compared to usual care. There are indications of benefit for the program for those that attend more sessions and those with urostomies.
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Affiliation(s)
- Robert S Krouse
- Department of Surgery, University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, Pennsylvania, USA
| | - Siqi Zhang
- Biostatistics Analysis Center, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | | | - Virginia Sun
- Division of Nursing Research and Education, Department of Population Sciences, City of Hope, Duarte, California, USA
| | - Marcia Grant
- Division of Nursing Research and Education, Department of Population Sciences, City of Hope, Duarte, California, USA
| | | | - Mark C Hornbrook
- Kaiser Permanente Center for Health Research, Portland, Oregon, USA
| | - Zuleyha Cidav
- Center for Mental Health, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Ariel Nehemiah
- Department of Surgery, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Matthew Rock
- Department of Surgery, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Scott Appel
- Biostatistics Analysis Center, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Judith H Hibbard
- Department of Planning, Public Policy & Management, University of Oregon, Eugene, Oregon, USA
| | - Michael J Holcomb
- Arizona Telemedicine Program, University of Arizona, Tucson, Arizona, USA
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Yang S, Park JW, Hur H, Kim MJ, Jeong SY, Park K, Kim IY. Development of a home health care service platform for ostomy patient management. Ann Coloproctol 2024; 40:36-43. [PMID: 36404498 PMCID: PMC10915528 DOI: 10.3393/ac.2022.00360.0051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 07/12/2022] [Accepted: 07/18/2022] [Indexed: 11/22/2022] Open
Abstract
PURPOSE The use of an ostomy for urination and defecation leads to reduced quality of life. Although many ostomy management strategies are needed, such strategies are often implemented by patients. Thus, there is a need for a home health care service platform that can be used in ostomy patient management. METHODS We developed an ostomy patient management platform by identifying the needs of patients and medical staff through the Chronic Care Ostomy Self-Management Training Program in the United States and from studies conducted in Korea. RESULTS The platform encompassed physical management, psychological management, maintenance of social function, spiritual stability, and home medical care. These components were implemented through monitoring, self-care guidance, and a community platform. For the monitoring function, patients entered their health status in a mobile application (app); the medical staff at the affiliated hospital then monitored the stoma status through a web interface. CONCLUSION Our platform allows medical staff to monitor ostomy patients through a web interface and help such patients to fully manage their ostomy at home using an app. We expect that the continued development of patient-oriented functions in our app will allow ostomy patients to experience quality-of-life improvements.
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Affiliation(s)
- Seongwoo Yang
- HERINGS, The Institute of Advanced Clinical and Biomedical Research, Seoul, Korea
| | - Ji Won Park
- Department of Surgery, Seoul National University College of Medicine, Seoul, Korea
| | - Hyuk Hur
- Department of Surgery, Yonsei University College of Medicine, Seoul, Korea
- Korean Wound and Ostomy Study Group, The Korean Society of Coloproctology, Seoul, Korea
| | - Min Jung Kim
- Department of Surgery, Seoul National University College of Medicine, Seoul, Korea
| | - Seung-Yong Jeong
- Department of Surgery, Seoul National University College of Medicine, Seoul, Korea
| | - Kyounghoon Park
- HERINGS, The Institute of Advanced Clinical and Biomedical Research, Seoul, Korea
| | - Ik Yong Kim
- Division of Colorectal Surgery, Department of Surgery, Yonsei University Wonju College of Medicine, Wonju, Korea
- Korean Wound and Ostomy Study Group, The Korean Society of Coloproctology, Seoul, Korea
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Mithany RH, Shahid MH, Shahid R, Hannan A, Gill MU, Aslam S. Ileostomy 101: Understanding the Basics for Optimal Patient Care. Cureus 2023; 15:e46822. [PMID: 37829655 PMCID: PMC10565359 DOI: 10.7759/cureus.46822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/10/2023] [Indexed: 10/14/2023] Open
Abstract
This comprehensive literature review explores the foundational aspects of ileostomy, encompassing surgical techniques, postoperative care, complications, and advancements. Ileostomy, a surgical procedure redirecting the ileal lumen through an abdominal opening, is a critical intervention for various gastrointestinal conditions. The review delves into surgical techniques, emphasizing the importance of stoma location and type selection, whether temporary or permanent. Complications associated with ileostomy are discussed, highlighting the significance of vigilant postoperative care, including stoma care and addressing potential complications. The profound impact of ileostomy on patients' quality of life is elucidated, underlining the necessity for a holistic approach to patient care. Additionally, advancements in the field, such as biodegradable stoma bags, smart stoma appliances, and telemedicine, are explored for their potential to enhance patient outcomes. The review emphasizes the need for individualized approaches and ongoing research to maximize the benefits of these advancements for ileostomy patients and improve their overall experience.
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Affiliation(s)
- Reda H Mithany
- Laparoscopic Colorectal Surgery, Kingston Hospital NHS Foundation Trust, Kingston Upon Thames, GBR
| | | | - Ra'ana Shahid
- General Surgery, Lahore General Hospital, Lahore, PAK
| | - Abdul Hannan
- Surgery, Glangwili General Hospital, Carmarthen, GBR
| | - Muhammad Umar Gill
- Accident and Emergency Medicine, Kings College Hospital NHS Foundation Trust, London, GBR
| | - Samana Aslam
- Obstetrics and Gynaecology, Lahore General Hospital, Lahore, PAK
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García-Manzanares ME, Lancharro-Bermúdez M, Fernandez-Lasquetty-Blanc B, Hernández-Martínez A, Rodríguez-Almagro J, Caparros-Sanz MR. Assessment, diagnosis and treatment of peristomal skin lesions by remote imaging: An expert validation study. J Adv Nurs 2023; 79:630-640. [PMID: 36394252 PMCID: PMC10100438 DOI: 10.1111/jan.15497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 09/25/2022] [Accepted: 10/19/2022] [Indexed: 11/18/2022]
Abstract
BACKGROUND Prevention and treatment of peristomal skin problems should be a priority for nurses caring for ostomates, even when the assessment of lesions must be done remotely. OBJECTIVE To measure the level of agreement on assessment, diagnosis and care indications for peristomal skin lesions using remote imaging among nurses in Spain. DESIGN Prospective observational multicentre study to assess the diagnostic validity and inter- and intraobserver agreement between nurses in peristomal skin lesions. Data were collected between March and October 2019. SETTINGS AND PARTICIPANTS The research sample consisted of a group of 39 nurses with expertise in the care of ostomates. METHODS A panel of experts established a list of 24 common signs/findings, 15 diagnostic options and 35 treatment approaches for peristomal skin lesions. Three expert stoma therapy nurses compiled the clinical cases, which they described thoroughly and documented with photographs. The 39 participating nurses evaluated the cases in two rounds to measure inter and intraobserver agreement. RESULTS A high or very high level of agreement (κ > 0.61) was observed for the following signs: encrustation, nodules, mucocutaneous separation and varicose veins; for the following diagnoses: mucocutaneous dehiscence, allergic contact dermatitis, encrustation and varicose veins (caput medusae); for the following treatments: recommending a diet rich in vitamin C/blueberries, applying acetic acid dressings, applying cold and topical tacrolimus treatment. CONCLUSIONS The most easily identifiable lesions were those most prevalent and with visible signs. There was a lower level of agreement in identifying lesions for which photographs required additional information (laboratory data, description of signs and symptoms, type of diet and level of self-care). It is important to train nurses caring for ostomates to correctly describe ostomy-related lesions, which is important for nursing records, continuity of care and telehealth care.
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Affiliation(s)
- Maria-Elena García-Manzanares
- Department of Nursing, Hospital Universitario 12 de Octubre. Instituto de Investigación Sanitaria Hospital 12 de Octubre (imas12), Madrid, Spain.,Faculty of Nursing, University (Complutense of Madrid), Spain
| | | | | | - Antonio Hernández-Martínez
- Department of Nursing, Physiotherapy, and Occupational Therapy, Ciudad Real Faculty of Nursing, University of Castilla-La Mancha, Ciudad Real, Spain
| | - Julián Rodríguez-Almagro
- Department of Nursing, Physiotherapy, and Occupational Therapy, Ciudad Real Faculty of Nursing, University of Castilla-La Mancha, Ciudad Real, Spain
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Xu W, Wells CI, McGuinness M, Varghese C, Keane C, Liu C, O'Grady G, Bissett IP, Harmston C. Characterising nationwide reasons for unplanned hospital readmission after colorectal cancer surgery. Colorectal Dis 2023; 25:861-871. [PMID: 36587285 DOI: 10.1111/codi.16467] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 11/10/2022] [Accepted: 11/27/2022] [Indexed: 01/02/2023]
Abstract
BACKGROUND Readmissions after colorectal cancer surgery are common, despite advancements in surgical care, and have a significant impact on both individual patients and overall healthcare costs. The aim of this study was to determine the 30-and 90 days readmission rate after colorectal cancer surgery, and to investigate the risk factors and clinical reasons for unplanned readmissions. METHOD A multicenter, population-based study including all patients discharged after index colorectal cancer resection from 2010 to 2020 in Aotearoa New Zealand (AoNZ) was completed. The Ministry of Health National Minimum Dataset was used. Rates of readmission at 30 days and 90 days were calculated. Mixed-effect logistic regression models were built to investigate factors associated with unplanned readmission. Reasons for readmission were described. RESULTS Data were obtained on 16,885 patients. Unplanned 30-day and 90-day hospital readmission rates were 15.1% and 23.7% respectively. The main readmission risk factors were comorbidities, advanced disease, and postoperative complications. Hospital level variation was not present. Despite risk adjustment, R2 value of models was low (30 days: 4.3%, 90 days: 5.2%). The most common reasons for readmission were gastrointestinal causes (32.1%) and wound complications (14.4%). Rates of readmission did not improve over the 11 years study period (p = 0.876). CONCLUSION Readmissions following colorectal resections in AoNZ are higher than other comparable healthcare systems and rates have remained constant over time. While patient comorbidities and postoperative complications are associated with readmission, the explanatory value of these variables is poor. To reduce unplanned readmissions, efforts should be focused on prevention and early detection of post-discharge complications.
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Affiliation(s)
- William Xu
- Department of Surgery, The University of Auckland, Auckland, New Zealand
| | - Cameron I Wells
- Department of Surgery, The University of Auckland, Auckland, New Zealand.,Department of General Surgery, Counties Manukau District Health Board, Auckland, New Zealand
| | - Matthew McGuinness
- Department of Surgery, The University of Auckland, Auckland, New Zealand.,Department of Surgery, Northland District Health Board, Whangarei, New Zealand
| | - Chris Varghese
- Department of Surgery, The University of Auckland, Auckland, New Zealand
| | - Celia Keane
- Department of Surgery, The University of Auckland, Auckland, New Zealand.,Department of Surgery, Northland District Health Board, Whangarei, New Zealand
| | - Chen Liu
- Department of Surgery, The University of Auckland, Auckland, New Zealand
| | - Gregory O'Grady
- Department of Surgery, The University of Auckland, Auckland, New Zealand
| | - Ian P Bissett
- Department of Surgery, The University of Auckland, Auckland, New Zealand.,Department of General Surgery, Auckland City Hospital, Auckland, New Zealand
| | - Christopher Harmston
- Department of Surgery, The University of Auckland, Auckland, New Zealand.,Department of Surgery, Northland District Health Board, Whangarei, New Zealand
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