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Beck MH, Balci-Hakimeh D, Scheuerecker F, Wallach C, Güngor HL, Lee M, Abdel-Kawi AF, Glajzer J, Vasiljeva J, Kubiak K, Blohmer JU, Sehouli J, Pietzner K. Real-World Evidence: How Long Do Our Patients Fast?-Results from a Prospective JAGO-NOGGO-Multicenter Analysis on Perioperative Fasting in 924 Patients with Malignant and Benign Gynecological Diseases. Cancers (Basel) 2023; 15:cancers15041311. [PMID: 36831652 PMCID: PMC9953889 DOI: 10.3390/cancers15041311] [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] [Received: 01/07/2023] [Revised: 02/05/2023] [Accepted: 02/11/2023] [Indexed: 02/22/2023] Open
Abstract
BACKGROUND Despite the key role of optimized fasting in modern perioperative patient management, little current data exist on perioperative fasting intervals in routine clinical practice. METHODS In this multicenter prospective study, the length of pre- and postoperative fasting intervals was assessed with the use of a specifically developed questionnaire. Between 15 January 2021 and 31 May 2022, 924 gynecology patients were included, from 13 German gynecology departments. RESULTS On average, patients remained fasting for about three times as long as recommended for solid foods (17:02 ± 06:54 h) and about five times as long as recommended for clear fluids (9:21 ± 5:48 h). The average perioperative fasting interval exceeded one day (28:23 ± 14:02 h). Longer fasting intervals were observed before and after oncological or extensive procedures, while shorter preoperative fasting intervals were reported in the participating university hospitals. Smoking, treatment in a non-university hospital, an increased Charlson Comorbidity Index and extensive surgery were significant predictors of longer preoperative fasting from solid foods. In general, prolonged preoperative fasting was tolerated well and quality of patient information was perceived as good. CONCLUSION Perioperative fasting intervals were drastically prolonged in this cohort of 924 gynecology patients. Our data indicate the need for better patient education about perioperative fasting.
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Affiliation(s)
- Maximilian Heinz Beck
- Department of Gynecology, Breast Center, Campus Mitte, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, 10117 Berlin, Germany
- Young Academy of Gynecologic Oncology (JAGO), Nord-Ostdeutsche Gesellschaft für Gynäkologische Onkologie, 13359 Berlin, Germany
- Correspondence: ; Tel.: +49-30-450-564172
| | - Derya Balci-Hakimeh
- Young Academy of Gynecologic Oncology (JAGO), Nord-Ostdeutsche Gesellschaft für Gynäkologische Onkologie, 13359 Berlin, Germany
- Department of Gynecology, St. Joseph Hospital, 12101 Berlin, Germany
| | - Florian Scheuerecker
- Young Academy of Gynecologic Oncology (JAGO), Nord-Ostdeutsche Gesellschaft für Gynäkologische Onkologie, 13359 Berlin, Germany
- Department of Gynaecology and Gynaecologic Oncology, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany
| | - Charlotte Wallach
- Young Academy of Gynecologic Oncology (JAGO), Nord-Ostdeutsche Gesellschaft für Gynäkologische Onkologie, 13359 Berlin, Germany
- Department of Gynaecology and Gynaecologic Oncology, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany
| | - Hannah Lena Güngor
- Young Academy of Gynecologic Oncology (JAGO), Nord-Ostdeutsche Gesellschaft für Gynäkologische Onkologie, 13359 Berlin, Germany
- Department of Gynecology, Katholisches Marienkrankenhaus—Klinik für Gynäkologie, 22087 Hamburg, Germany
| | - Marlene Lee
- Department of Gynecology, Center for Oncological Surgery, Campus Virchow Klinikum, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, 13353 Berlin, Germany
| | - Ahmed Farouk Abdel-Kawi
- Department of Gynecology, Katholisches Marienkrankenhaus—Klinik für Gynäkologie, 22087 Hamburg, Germany
- Department of Gynecology, Faculty of Medicine, University of Assiut, Assiut 71515, Egypt
| | - Jacek Glajzer
- Department of Gynecology and Obstetrics, Breast Center Ostsachsen, Klinikum Oberlausitzer Bergland Zittau/Ebersbach, 02730 Ebersbach, Germany
| | | | - Karol Kubiak
- Young Academy of Gynecologic Oncology (JAGO), Nord-Ostdeutsche Gesellschaft für Gynäkologische Onkologie, 13359 Berlin, Germany
- Department of Gynecology and Obstetrics, St. Franziskus Hospital Muenster, 48145 Muenster, Germany
| | - Jens-Uwe Blohmer
- Department of Gynecology, Breast Center, Campus Mitte, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, 10117 Berlin, Germany
| | - Jalid Sehouli
- Young Academy of Gynecologic Oncology (JAGO), Nord-Ostdeutsche Gesellschaft für Gynäkologische Onkologie, 13359 Berlin, Germany
- Department of Gynecology, Center for Oncological Surgery, Campus Virchow Klinikum, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, 13353 Berlin, Germany
| | - Klaus Pietzner
- Young Academy of Gynecologic Oncology (JAGO), Nord-Ostdeutsche Gesellschaft für Gynäkologische Onkologie, 13359 Berlin, Germany
- Department of Gynecology, Center for Oncological Surgery, Campus Virchow Klinikum, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, 13353 Berlin, Germany
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van Noort HHJ, Lamers CR, Vermeulen H, Huisman-de Waal G, Witteman BJM. Patient Education Regarding Fasting Recommendations to Shorten Fasting Times in Patients Undergoing Esophagogastroduodenoscopy: A Controlled Pilot Study. Gastroenterol Nurs 2022; 45:342-353. [PMID: 35856722 PMCID: PMC9514738 DOI: 10.1097/sga.0000000000000678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Accepted: 03/31/2022] [Indexed: 11/25/2022] Open
Abstract
This study evaluated the applicability and efficacy of patient education regarding fasting recommendations to shorten fasting times in patients undergoing esophagogastroduodenoscopy (EGD). A prospective nonrandomized controlled pilot study was performed. The intervention group (IG) was educated by nurses to eat until 6 hours and drink until 2 hours before EGD. The control group (CG) received usual care. Outcomes were applicability as perceived by patients, adherence to fasting recommendations, gastric visibility, and patients' comfort. A total of 109 patients were included of whom 42 were IG patients (37%). Patients' perspectives on fasting, their experienced discomfort, professional support, and circadian rhythm influenced application of fasting recommendations. Adherence to length of fasting from foods improved with 3:14 hours ( p < .001) and from liquids with 5:22 hours ( p < .001) in the IG compared with the CG. Gastric visibility during EGD was better in the IG than in the CG. The IG patients experienced significant less thirst, hunger, headache, and anxiety. To successfully reduce fasting times, fasting education should include positive, individual instructions, which help patients apply the fasting recommendations within their biorhythm. Positive, concrete instructions by nurses shortened fasting times before EGD, which improved gastric visibility and reduced patient discomfort.
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Affiliation(s)
- Harm H. J. van Noort
- Correspondence to: Harm H. J. van Noort, MSc, RN, Department of Surgery, Radboud University Medical Centre, PO Box 9101, 6500 HB, Nijmegen, The Netherlands ()
| | - Carlijn R. Lamers
- Harm H. J. van Noort, MSc, RN, is from the Departments of Nutrition, Physical Activity and Sports, and Surgery, Gelderse Vallei Hospital, Ede, The Netherlands; and Department of Surgery, Radboud University Medical Centre, Nijmegen, The Netherlands
- Carlijn R. Lamers, MD, is from the Department of Gastroenterology and Hepatology, Gelderse Vallei Hospital, Ede, The Netherlands; and Division of Human Nutrition and Health, Wageningen University & Research, Wageningen, The Netherlands
- Hester Vermeulen, PhD, RN, is from the Radboud University Medical Centre, Radboud Institute for Health Sciences, IQ Healthcare, Nijmegen, The Netherlands; and Faculty of Health and Social Studies, HAN University of Applied Sciences, Nijmegen, The Netherlands
- Getty Huisman-de Waal, PhD, RN, is from the Radboud University Medical Centre, Radboud Institute for Health Sciences, IQ Healthcare, Nijmegen, The Netherlands; and Department of Surgery, Radboud University Medical Centre, Nijmegen, The Netherlands
- Ben J. M. Witteman, PhD, MD, is from the Department of Gastroenterology and Hepatology, Gelderse Vallei Hospital, Ede, The Netherlands; and Division of Human Nutrition and Health, Wageningen University & Research, Wageningen, The Netherlands
| | - Hester Vermeulen
- Harm H. J. van Noort, MSc, RN, is from the Departments of Nutrition, Physical Activity and Sports, and Surgery, Gelderse Vallei Hospital, Ede, The Netherlands; and Department of Surgery, Radboud University Medical Centre, Nijmegen, The Netherlands
- Carlijn R. Lamers, MD, is from the Department of Gastroenterology and Hepatology, Gelderse Vallei Hospital, Ede, The Netherlands; and Division of Human Nutrition and Health, Wageningen University & Research, Wageningen, The Netherlands
- Hester Vermeulen, PhD, RN, is from the Radboud University Medical Centre, Radboud Institute for Health Sciences, IQ Healthcare, Nijmegen, The Netherlands; and Faculty of Health and Social Studies, HAN University of Applied Sciences, Nijmegen, The Netherlands
- Getty Huisman-de Waal, PhD, RN, is from the Radboud University Medical Centre, Radboud Institute for Health Sciences, IQ Healthcare, Nijmegen, The Netherlands; and Department of Surgery, Radboud University Medical Centre, Nijmegen, The Netherlands
- Ben J. M. Witteman, PhD, MD, is from the Department of Gastroenterology and Hepatology, Gelderse Vallei Hospital, Ede, The Netherlands; and Division of Human Nutrition and Health, Wageningen University & Research, Wageningen, The Netherlands
| | - Getty Huisman-de Waal
- Harm H. J. van Noort, MSc, RN, is from the Departments of Nutrition, Physical Activity and Sports, and Surgery, Gelderse Vallei Hospital, Ede, The Netherlands; and Department of Surgery, Radboud University Medical Centre, Nijmegen, The Netherlands
- Carlijn R. Lamers, MD, is from the Department of Gastroenterology and Hepatology, Gelderse Vallei Hospital, Ede, The Netherlands; and Division of Human Nutrition and Health, Wageningen University & Research, Wageningen, The Netherlands
- Hester Vermeulen, PhD, RN, is from the Radboud University Medical Centre, Radboud Institute for Health Sciences, IQ Healthcare, Nijmegen, The Netherlands; and Faculty of Health and Social Studies, HAN University of Applied Sciences, Nijmegen, The Netherlands
- Getty Huisman-de Waal, PhD, RN, is from the Radboud University Medical Centre, Radboud Institute for Health Sciences, IQ Healthcare, Nijmegen, The Netherlands; and Department of Surgery, Radboud University Medical Centre, Nijmegen, The Netherlands
- Ben J. M. Witteman, PhD, MD, is from the Department of Gastroenterology and Hepatology, Gelderse Vallei Hospital, Ede, The Netherlands; and Division of Human Nutrition and Health, Wageningen University & Research, Wageningen, The Netherlands
| | - Ben J. M. Witteman
- Harm H. J. van Noort, MSc, RN, is from the Departments of Nutrition, Physical Activity and Sports, and Surgery, Gelderse Vallei Hospital, Ede, The Netherlands; and Department of Surgery, Radboud University Medical Centre, Nijmegen, The Netherlands
- Carlijn R. Lamers, MD, is from the Department of Gastroenterology and Hepatology, Gelderse Vallei Hospital, Ede, The Netherlands; and Division of Human Nutrition and Health, Wageningen University & Research, Wageningen, The Netherlands
- Hester Vermeulen, PhD, RN, is from the Radboud University Medical Centre, Radboud Institute for Health Sciences, IQ Healthcare, Nijmegen, The Netherlands; and Faculty of Health and Social Studies, HAN University of Applied Sciences, Nijmegen, The Netherlands
- Getty Huisman-de Waal, PhD, RN, is from the Radboud University Medical Centre, Radboud Institute for Health Sciences, IQ Healthcare, Nijmegen, The Netherlands; and Department of Surgery, Radboud University Medical Centre, Nijmegen, The Netherlands
- Ben J. M. Witteman, PhD, MD, is from the Department of Gastroenterology and Hepatology, Gelderse Vallei Hospital, Ede, The Netherlands; and Division of Human Nutrition and Health, Wageningen University & Research, Wageningen, The Netherlands
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Bang YJ, Lee JH, Kim CS, Lee YY, Min JJ. Anxiolytic effects of chewing gum during preoperative fasting and patient-centered outcome in female patients undergoing elective gynecologic surgery: randomized controlled study. Sci Rep 2022; 12:4165. [PMID: 35264684 PMCID: PMC8907183 DOI: 10.1038/s41598-022-07942-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Accepted: 01/06/2022] [Indexed: 11/09/2022] Open
Abstract
Although previous studies reported that chewing gum during the preoperative fasting has the benefits of alleviating anxiety and dry mouth, preoperative chewing gum has yet to be accepted as a standard practice due to conventional anesthetic custom. Our study aimed to prospectively evaluate the effects of gum chewing on preoperative anxiety and patient's discomfort in female patients undergoing gynecologic surgery. Ninety-four patients were enrolled and randomized either into conventional fasting group (control group) or chewing gum with fasting group (gum group). The control group was instructed to fast from 3 p.m. on the day before surgery. The gum group performed preoperative fasting in the same manner, but was encouraged to chew gum freely during the fasting period. The primary endpoint was the degree of preoperative anxiety. For the evaluation of preoperative anxiety, Amsterdam preoperative anxiety and information scale (APAIS) was used. Preoperative gastric fluid volume and acidity were also measured as the secondary outcomes. Preoperative anxiety using APAIS was significantly lower in the gum group compared to the control group (control group vs. gum group: 20.9 vs. 17.8, p = 0.009). However, there was no significant difference in the gastric fluid analysis between the groups. In the female patients for elective gynecologic surgery, chewing gum during the preoperative fasting period helped to alleviate preoperative anxiety without additional increase of pulmonary aspiration risks.Trial registration: KCT0004422 (05/11/2019, https://cris.nih.go.kr ; registration number).
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Affiliation(s)
- Yu Jeong Bang
- Department of Anesthesiology and Pain Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, Korea
| | - Jong-Hwan Lee
- Department of Anesthesiology and Pain Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, Korea
| | - Chung Su Kim
- Department of Anesthesiology and Pain Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, Korea
| | - Yoo-Young Lee
- Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Jeong-Jin Min
- Department of Anesthesiology and Pain Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, Korea.
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van Noort HHJ, Eskes AM, Vermeulen H, Besselink MG, Moeling M, Ubbink DT, Huisman-de Waal G, Witteman BJM. Fasting habits over a 10-year period: An observational study on adherence to preoperative fasting and postoperative restoration of oral intake in 2 Dutch hospitals. Surgery 2021; 170:532-540. [PMID: 33712307 DOI: 10.1016/j.surg.2021.01.037] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 12/29/2020] [Accepted: 01/24/2021] [Indexed: 12/20/2022]
Abstract
BACKGROUND Since 1999, international guidelines recommend fasting from solid foods up to 6 hours and clear liquids up to 2 hours before surgery. Early recovery after surgery programs recommend restoration of oral intake as soon as possible. This study determines adherence to these guidelines up to 20 years after its introduction. METHODS A 2-center observational study with a 10-year interval was performed in the Netherlands. In period 1 (2009), preoperative fasting time was observed as primary outcome. In period 2 (2019), preoperative fasting and postoperative restoration of oral intake were observed. Fasting times were collected using an interview-assisted questionnaire. RESULTS During both periods, 311 patients were included from vascular, trauma, orthopedic, urological, oncological, gastrointestinal, and ear-nose-throat and maxillary surgical units. Duration of preoperative fasting was prolonged in 290 (90.3%) patients for solid foods and in 208 (67.8%) patients for clear liquids. Median duration of preoperative fasting from solid foods and clear liquids was respectively 2.5 and 3 times the recommended 6 and 2 hours, with no improvements from one period to another. Postoperative food intake was resumed within 4 hours in 30.7% of the patients. Median duration of perioperative fasting was 23:46 hours (interquartile range 20:00-30:30 hours) for solid foods and 11:00 hours (interquartile range 7:53-16:00 hours) for clear liquids. CONCLUSION Old habits die hard. Despite 20 years of fasting guidelines, surgical patients are still exposed erroneously to prolonged fasting in 2 hospitals. Patients should be encouraged to eat and drink until 6 and 2 hours, respectively, before surgery and to restart eating after surgery.
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Affiliation(s)
- Harm H J van Noort
- Department of Nutrition, Physical Activity and Sports, Department of Surgery, Gelderse Vallei Hospital, Ede, The Netherlands; Radboud University Medical Centre, Radboud Institute for Health Sciences, IQ Healthcare, Nijmegen, The Netherlands; Department of Surgery, Radboud University Medical Centre, Nijmegen, The Netherlands.
| | - Anne M Eskes
- Department of Surgery, Amsterdam UMC, University of Amsterdam, The Netherlands; Menzies Health Institute Queensland and School of Nursing and Midwifery, Griffith University, Gold Coast, Australia. https://twitter.com/Anne_Eskes
| | - Hester Vermeulen
- Radboud University Medical Centre, Radboud Institute for Health Sciences, IQ Healthcare, Nijmegen, The Netherlands; Faculty of Health and Social Studies, HAN University of Applied Sciences, Nijmegen, The Netherlands. https://twitter.com/hvermeulen67
| | - Marc G Besselink
- Department of Surgery, Amsterdam UMC, Cancer Center Amsterdam, University of Amsterdam, The Netherlands. https://twitter.com/MarcBesselink
| | - Miranda Moeling
- Department of Nutrition and Dietetics, Faculty of Health, Nutrition and Sports, The Hague University of Applied Sciences, The Hague, The Netherlands
| | - Dirk T Ubbink
- Department of Surgery, Amsterdam UMC, University of Amsterdam, The Netherlands
| | - Getty Huisman-de Waal
- Radboud University Medical Centre, Radboud Institute for Health Sciences, IQ Healthcare, Nijmegen, The Netherlands. https://twitter.com/getty_huisman
| | - Ben J M Witteman
- Department of Gastroenterology and Hepatology, Gelderse Vallei Hospital, Ede, The Netherlands; Division of Nutrition and Disease, Wageningen University, The Netherlands
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Nascimento LAD, Garcia AKA, Conchon MF, Lopes MVDO, Fonseca LF. Concept analysis of Perioperative Thirst for the development of a new nursing diagnosis. Rev Bras Enferm 2021; 74:e20200065. [PMID: 33681954 DOI: 10.1590/0034-7167-2020-0065] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Accepted: 09/13/2020] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVES to analyze the perioperative thirst concept for the development of a new diagnostic structure according to NANDA International. METHODS a concept analysis study based on the framework proposed by Walker and Avant, instrumentalized through an integrative literature review based on SCOPUS, CINAHL, PUBMED, LILACS, and WOS. The elaboration of the diagnostic structure followed NANDA International guidelines. RESULTS 41 studies were analyzed revealing that perioperative thirst is prevalent and intense, having visceral and behavioral attributes as the core of the concept. Antecedents indicate that surgical patients are vulnerable to thirst; and consequents 16 signs and symptoms were organized and model cases were developed. A diagnostic structure has been developed for perioperative thirst. FINAL CONSIDERATIONS concept analysis allowed language standardization that describes thirsty patients, helping the identification, planning of actions and communication of perioperative nursing care.
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Yilmaz M, Çelik M. The Effects of Preoperative Fasting on Patients Undergoing Thoracic Surgery. J Perianesth Nurs 2020; 36:167-173. [PMID: 33303342 DOI: 10.1016/j.jopan.2020.08.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 08/10/2020] [Accepted: 08/16/2020] [Indexed: 11/17/2022]
Abstract
PURPOSE The purpose of this study was to determine the effects of fasting before surgery on patients undergoing thoracic surgery. DESIGN This descriptive cross-sectional study was conducted from January 1 to June 30, 2017. METHODS The study was carried out with 85 patients who underwent thoracotomy, mediastinoscopy, or rib resection in the thoracic surgery department of a university hospital. All patients started fasting midnight before day of surgery. Data were collected using a questionnaire, Visual Analog Patient Satisfaction Scale, and preoperative laboratory findings form. FINDINGS The mean fasting hours of solids and clear fluids were 8 and 16, respectively, and the mean duration of preoperative fasting (POF) was 10.16 (SD = 1.67), total fasting time average was 28.09 (SD = 7.11). Total protein and albumin levels decreased, and glucose level increased after surgery. The difference between total protein, albumin, and glucose levels preoperatively and postoperatively was significant (P < .05). The difference between patient satisfaction and thirst was found to be statistically significant (P < .05). A positive correlation was found between POF and thirst (r = 0.450; P = .000), hunger (r = 0.402; P = .000), total protein (r = 0.508; P = .000), albumin (r = 0.537; P = .000), and glucose levels (r = 0.371; P = .000). CONCLUSIONS POF had an adverse effect on thirst, hunger, and total protein as well as albumin and glucose levels.
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Affiliation(s)
- Meryem Yilmaz
- Nursing Division, Department of Surgical Nursing, Faculty of Health Sciences, Sivas Cumhuriyet University, Sivas, Turkey.
| | - Meltem Çelik
- Thoracic Surgery Department, Sivas Cumhuriyet University, Sivas, Turkey
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Yip A, Hogan S, Carey S. Interventions Aimed at Reducing Fasting Times in Acute Hospital Patients: A Systematic Literature Review. Nutr Clin Pract 2020; 36:133-152. [PMID: 32970377 DOI: 10.1002/ncp.10579] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Accepted: 08/23/2020] [Indexed: 11/11/2022] Open
Abstract
Despite current guidelines recommending fasting from solids for ≤6 hours and clear fluids for ≤2 hours prior to surgery, outdated practices endure; patients fast for unnecessarily prolonged periods because of beliefs regarding aspiration risk upon anaesthesia induction. This literature review aimed to identify and evaluate current interventions aiming to reduce preoperative fasting times for acutely ill hospital patients, summarizing effective interventional strategies and associated outcomes. EMBASE, MEDLINE, PreMEDLINE, and CINAHL were systematically searched. Quality of evidence was assessed using Cochrane risk-of-bias tools. Studies, of any type, reporting fasting times as a primary or secondary outcome were included. A total of 1918 potential studies were identified; of these, 16 studies were included. Seven studies investigated the effect of changing fasting protocol on gastric fluid volume/residual gastric volume (GFV/RGV) and gastric pH as surrogate measures for aspiration risk. No significant differences in GFV/RGV and gastric pH due to reduced preoperative fasting were reported, thus no change in aspiration risk. Eight studies documented improvements in patient-reported outcomes with shorter fasting times. However, this review identified a paucity of studies that trialled interventions to reduce fasting times as the primary aim. These interventions were multimodal and multidisciplinary in nature, incorporating principles of implementation science to successfully achieve significant reductions in fasting times. This review highlights that reducing the preoperative fasting period is safe while improving patient's physical and psychological well-being. Further high-quality studies that investigate multimodal interventions, and that utilize implementation science principles, are required in this area.
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Affiliation(s)
- Adela Yip
- School of Life and Environmental Sciences, University of Sydney, Sydney, Australia
| | - Sophie Hogan
- School of Life and Environmental Sciences, University of Sydney, Sydney, Australia.,Department of Nutrition & Dietetics, Royal Prince Alfred Hospital, Sydney, Australia
| | - Sharon Carey
- School of Life and Environmental Sciences, University of Sydney, Sydney, Australia.,Department of Nutrition & Dietetics, Royal Prince Alfred Hospital, Sydney, Australia
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King E. Preoperative fasting durations for adult elective surgical patients: Convenient for the professional, but detrimental to the patient? A narrative review. J Perioper Pract 2019; 29:393-397. [PMID: 30806189 DOI: 10.1177/1750458919832482] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Preoperative fasting is necessary in reducing the risk of aspiration of stomach contents when undergoing a procedure that requires anaesthesia. There are numerous guidelines based upon evidence-based practice that outline the safe duration of a fast prior to the induction of anaesthesia. Common practice however is to give advice that unnecessarily starves the patient leading to perioperative complications. There is a breadth of literature analysing the fasting durations of various institutions, with a consensus of fasting from midnight being the norm, and side effects of nausea and dehydration being unfortunate by-products of fasting. A review of the literature examines the continued poor compliance of evidenced-based practice.
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Affiliation(s)
- Emma King
- Theatre Department, Luton and Dunstable University Hospital NHS Foundation Trust, Luton, UK
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Toms AS, Rai E. Operative fasting guidelines and postoperative feeding in paediatric anaesthesia-current concepts. Indian J Anaesth 2019; 63:707-712. [PMID: 31571683 PMCID: PMC6761784 DOI: 10.4103/ija.ija_484_19] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Preoperative fasting period is the prescribed time prior to any procedure done either under general anaesthesia, regional anaesthesia or sedation, when oral intake of liquids or solids are not allowed. This mandatory fasting is a safety precaution that helps to protect from pulmonary aspiration of gastric contents which may occur any time during anaesthesia. We searched PUBMED for English language articles using keywords including child, paediatric, anaesthesia, fasting, preoperative, gastric emptying. We also hand searched references from relevant review articles and major society guidelines. Association of Paediatric Anaesthesiologists of Great Britain and Ireland (APAGBI), the French Language Society of Paediatric Anaesthesiologists and the European Society of Paediatric Anesthetists recommends clear fluid intake upto one hour prior to elective surgery unless specific contraindications exists. Current guidelines recommend fasting duration of 4 hours for breastmilk, 6 hours for milk and light meals and 8 hours for fatty meals. The European Society for Clinical Nutrition and Metabolism (ESPEN) guidelines recommend that oral intake can be initiated within hours of surgery in most patients. While fluids can be started almost immediately, the introduction of solids should be done more cautiously.
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Affiliation(s)
- Ann Sumin Toms
- Department of Anesthesia, Christian Medical College, Vellore, Tamil Nadu, India
| | - Ekta Rai
- Department of Anesthesia, Christian Medical College, Vellore, Tamil Nadu, India
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Tsukamoto M, Hitosugi T, Yokoyama T. Influence of Fasting Duration on Body Fluid and Hemodynamics. Anesth Prog 2018; 64:226-229. [PMID: 29200368 DOI: 10.2344/anpr-65-01-01] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Fasting before general anesthesia aims to reduce the volume and acidity of stomach contents, which reduces the risk of regurgitation and aspiration. Prolonged fasting for many hours prior to surgery could lead to unstable hemodynamics, however. Therefore, preoperative oral intake of clear fluids 2 hours prior to surgery is recommended to decrease dehydration without an increase in aspiration risk. In this study, we investigated the body fluid composition and hemodynamics of patients undergoing general anesthesia as the first case of the day versus the second subsequent case. We retrospectively reviewed the general anesthesia records of patients over 20 years old who underwent oral maxillofacial surgery. We investigated patient demographics, preoperative fasting time, anesthetic time, urine output, infusion volume, and opioid and vasopressor use. With respect to body fluid and hemodynamics, we extracted the data from the induction of anesthesia through 2 hours of anesthesia time. Thirty patients were suitable for this study. Patients were divided into 2 groups: patients who underwent surgery as the first case of the day (am group: n = 15) and patients who underwent surgery as the second case (pm group: n = 15). There were no significant differences between the 2 groups in patient demographics. In the pm group, fasting time for a light meal (832 minutes) was significantly longer than for the am group (685 minutes), p = .005. In the pm group, fasting time for clear fluids (216 minutes) was also significantly longer than for the am group (194 minutes), p = .005. Body fluid composition was not significantly different between the 2 groups. In addition, cardiac parameters intraoperatively were stable. In the pm group, vasopressors were used in 4 patients at the induction of anesthesia (p = .01). There were not statistically significant changes in cardiac function or body fluid composition between patients treated as the first case of the day vs patients who underwent surgery with general anesthesia as the second case of the day.
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Affiliation(s)
- Masanori Tsukamoto
- Department of Dental Anesthesiology, Kyushu University Hospital, Fukuoka, Japan
| | - Takashi Hitosugi
- Department of Dental Anesthesiology, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
| | - Takeshi Yokoyama
- Department of Dental Anesthesiology, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
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Wilson GR, Dorrington KL. Starvation before surgery: is our practice based on evidence? BJA Educ 2017. [DOI: 10.1093/bjaed/mkx009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Crosson JA. Enhanced Recovery After Surgery-The Importance of the Perianesthesia Nurse on Program Success. J Perianesth Nurs 2017; 33:366-374. [PMID: 30077278 DOI: 10.1016/j.jopan.2016.09.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Revised: 09/07/2016] [Accepted: 09/30/2016] [Indexed: 12/01/2022]
Abstract
Continued advancements in perioperative care and anesthesia technology have improved surgical outcomes and accelerated the patient's ability to resume preoperative activities. With the current emphasis on decreased utilization of expensive hospital resources, a shorter length of stay while maintaining patient satisfaction is encouraged for maximum reimbursement. Through the implementation of evidence-based protocols that standardize care and promote patient medical optimization, the surgical stress response, complications, and time spent in the hospital can be reduced. Enhanced recovery after surgery uses a multidisciplinary and multimodal evidence-based approach to maximize patient recovery. Perianesthesia nurses are critical to its success and have an obligation to understand and participate in the process to optimize patient outcomes. After completing this educational article, the reader will be able to recognize the importance of the perianesthesia nurse in implementing an enhanced recovery after surgery program; review the patient benefits of enhanced recovery; and describe the impact of multimodal pain management on patient length of stay and patient mobility.
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Pereira NDC, Turrini RNT, Poveda VDB. Perioperative fasting time among cancer patients submitted to gastrointestinal surgeries. Rev Esc Enferm USP 2017; 51:e03228. [PMID: 28562746 DOI: 10.1590/s1980-220x2016036203228] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Accepted: 02/03/2017] [Indexed: 12/20/2022] Open
Abstract
OBJECTIVE To identify the length of perioperative fasting among patients submitted to gastrointestinal cancer surgeries. METHOD Retrospective cohort study, developed by consulting the medical records of 128 patients submitted to gastrointestinal cancer surgeries. RESULTS The mean of total length of fasting was 107.6 hours. The total length of fasting was significantly associated with the number of symptoms presented before (p=0.000) and after the surgery (p=0.007), the length of hospital stay (p=0.000), blood transfusion (p=0.013), nasogastric tube (p=0.001) and nasojejunal tube (p=0,003), postoperative admission at ICU (p=0.002), postoperative death (p=0.000) and length of preoperative fasting (p=0.000). CONCLUSION The length of fasting is associated with complications that affect the quality of the patients' postoperative recovery and nurses' work. The nursing team should be alert to this aspect and being responsible for overseeing the patients' interest, should not permit the unnecessary extension of fasting. OBJETIVO Identificar la duración del ayuno perioperatorio entre los pacientes sometidos a cirugías de cáncer gastrointestinal. MÉTODO Estudio de cohorte retrospectivo, por consulta de los registros médicos de 128 pacientes sometidos a cirugías de cáncer gastrointestinal. RESULTADOS La media de la duración total del ayuno fue de 107,6 horas. La duración total del ayuno se asoció significativamente con el número de síntomas presentados antes (p=0,000) y después de la cirugía (p=0,007), la duración de la estancia hospitalaria (p=0,000), transfusión de sangre (p=0,013),tubo nasogástrico (P=0,003), ingreso postoperatorio en la UCI (p=0,002), muerte postoperatoria (p=0,000) y duración del ayuno preoperatorio (p=0,000). CONCLUSIÓN La duración del ayuno se asocia con complicaciones que afectan la calidad de la recuperación postoperatoria de los pacientes y el trabajo de enfermería. El equipo de enfermería debe estar alerta en relación a este aspecto y ser responsable de supervisar el interés de los pacientes, no permitiendo la extensión innecesaria del ayuno.
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Affiliation(s)
| | - Ruth Natalia Teresa Turrini
- Universidade de São Paulo, Escola de Enfermagem, Departamento de Enfermagem Médico-Cirúrgica, São Paulo, SP, Brazil
| | - Vanessa de Brito Poveda
- Universidade de São Paulo, Escola de Enfermagem, Departamento de Enfermagem Médico-Cirúrgica, São Paulo, SP, Brazil
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Zaborin A, Krezalek M, Hyoju S, Defazio JR, Setia N, Belogortseva N, Bindokas VP, Guo Q, Zaborina O, Alverdy JC. Critical role of microbiota within cecal crypts on the regenerative capacity of the intestinal epithelium following surgical stress. Am J Physiol Gastrointest Liver Physiol 2017; 312:G112-G122. [PMID: 27979825 PMCID: PMC5338606 DOI: 10.1152/ajpgi.00294.2016] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Revised: 11/03/2016] [Accepted: 11/27/2016] [Indexed: 02/07/2023]
Abstract
UNLABELLED Cecal crypts represent a unique niche that are normally occupied by the commensal microbiota. Due to their density and close proximity to stem cells, microbiota within cecal crypts may modulate epithelial regeneration. Here we demonstrate that surgical stress, a process that invariably involves a short period of starvation, antibiotic exposure, and tissue injury, results in cecal crypt evacuation of their microbiota. Crypts devoid of their microbiota display pathophysiological features characterized by abnormal stem cell activation as judged by leucine-rich repeat-containing G protein-coupled receptor 5 (Lgr5) staining, expansion of the proliferative zone toward the tips of the crypts, and an increase in apoptosis. In addition, crypts devoid of their microbiota display loss of their regenerative capacity as assessed by their ability to form organoids ex vivo. When a four-member human pathogen community isolated from the stool of a critically ill patient is introduced into the cecum of mice with empty crypts, crypts become occupied by the pathogens and further disruption of crypt homeostasis is observed. Fecal microbiota transplantation restores the cecal crypts' microbiota, normalizes homeostasis within crypts, and reestablishes crypt regenerative capacity. Taken together, these findings define an emerging role for the microbiota within cecal crypts to maintain epithelial cell homeostasis in a manner that may enhance recovery in response to the physiological stress imposed by the process of surgery. NEW & NOTEWORTHY This study provides novel insight into the process by which surgical injury places the intestinal epithelium at risk for colonization by pathogenic microbes and impairment of its regenerative capacity via loss of its microbiota. We show that fecal transplant restores crypt homeostasis in association with repopulation of the microbiota within cecal crypts.
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Affiliation(s)
| | - Monika Krezalek
- 1Department of Surgery, University of Chicago, Chicago, Illinois;
| | - Sanjiv Hyoju
- 1Department of Surgery, University of Chicago, Chicago, Illinois;
| | | | - Namrata Setia
- 2Pathology, Pritzker School of Medicine, University of Chicago, Chicago, Illinois;
| | | | - Vytautas P. Bindokas
- 3Integrated Light Microscopy Core Facility, University of Chicago, Chicago, Illinois; and
| | - Qiti Guo
- 4The James Franck Institute, University of Chicago, Chicago, Illinois
| | - Olga Zaborina
- 1Department of Surgery, University of Chicago, Chicago, Illinois;
| | - John C. Alverdy
- 1Department of Surgery, University of Chicago, Chicago, Illinois;
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Martins ADJC, Serva CADS, Fonseca THD, Martins MJDL, Poveda VDB. Fasting of less than eight hours in urgent and emergency surgeries versus complication. Rev Bras Enferm 2016; 69:712-7. [PMID: 27508477 DOI: 10.1590/0034-7167.2016690414i] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Accepted: 11/15/2015] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVE to verify the occurrence of intraoperative and postoperative complications in patients undergoing urgent and emergency surgical procedures between January and December 2012, with fasting time of less than 8 hours. METHOD a quantitative study was conducted, of the retrospective cohort type, through the analysis of medical records. RESULTS we included 181 records of patients undergoing surgical procedures with average duration of 59.4 minutes. Fractures correction surgeries stood out, totalling 32% of cases. We observed complications in 36 patients (19.9%), vomiting being the most prevalent (47.2%); followed by nausea (16.7%); need for blood transfusion (13.9%); surgical site infection (11.1%); and death (11.1%). The average fasting time was 133.5 minutes. The fasting time showed no statistically significant correlation with the complications investigated. CONCLUSION intraoperative and postoperative complications were associated with the clinical conditions of the patients and not with the fasting time.
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Affiliation(s)
| | | | | | | | - Vanessa de Brito Poveda
- Universidade de São Paulo, Escola de Enfermagem, Departamento de Enfermagem Médico-Cirúrgica. São Paulo-SP, Brasil
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Abdullah Al Maqbali M. Preoperative fasting for elective surgery in a regional hospital in Oman. ACTA ACUST UNITED AC 2016; 25:798-802. [DOI: 10.12968/bjon.2016.25.14.798] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Abebe WA, Rukewe A, Bekele NA, Stoffel M, Dichabeng MN, Shifa JZ. Preoperative fasting times in elective surgical patients at a referral Hospital in Botswana. Pan Afr Med J 2016; 23:102. [PMID: 27222691 PMCID: PMC4867185 DOI: 10.11604/pamj.2016.23.102.8863] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Accepted: 03/07/2016] [Indexed: 02/06/2023] Open
Abstract
Introduction Adults and children are required to fast before anaesthesia to reduce the risk of regurgitation and aspiration of gastric contents. However, prolonged periods of fasting are unnecessary and may cause complications. This study was conducted to evaluate preoperative fasting period in our centre and compare it with the ASA recommendations and factors that influence fasting periods. Methods This is a cross-sectional study of preoperative fasting times among elective surgical patients. A total numbers of 260 patients were interviewed as they arrived at the reception area of operating theatre using questionnaire. Results Majority of patients (98.1%) were instructed to fast from midnight. Fifteen patients (5.8%) reported that they were told the importance of preoperative fasting. The mean fasting period were 15.9±2.5 h (range 12.0-25.3 h) for solids and 15.3±2.3 h (range 12.0-22.0 h) for liquids. The mean duration of fasting was significantly longer for patients operated after midday compared to those operated before midday, p<0.001. Conclusion The mean fasting periods were 7.65 times longer for clear liquid and 2.5 times for solids than the ASA guidelines. It is imperative that the Hospital should establish Preoperative fasting policies and teach the staff who should ensure compliance with guidelines.
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Affiliation(s)
- Worknehe Agegnehu Abebe
- University of Botswana, University of Botswana, Department of Anesthesia & Critical Care, Gaborone, Botswana
| | - Ambrose Rukewe
- University of Botswana, University of Botswana, Department of Anesthesia & Critical Care, Gaborone, Botswana
| | - Negussie Alula Bekele
- University of Botswana, University of Botswana, Department of Anesthesia & Critical Care, Gaborone, Botswana
| | - Moeng Stoffel
- University of Botswana, Department of Statistics, Botswana
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Singh M, Chaudhary M, Vashistha A, Kaur G. Evaluation of effects of a preoperative 2-hour fast with glutamine and carbohydrate rich drink on insulin resistance in maxillofacial surgery. J Oral Biol Craniofac Res 2015; 5:34-9. [PMID: 25853046 PMCID: PMC4382506 DOI: 10.1016/j.jobcr.2015.02.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Accepted: 02/14/2015] [Indexed: 02/07/2023] Open
Abstract
INTRODUCTION The aim of this prospective, randomized, single-blinded study was to compare the effects of preoperative fast for clear fluids on insulin resistance and hemodynamic stability on patient undergoing maxillofacial surgery. METHOD In this study 20 patients undergoing maxillofacial surgery were randomized into four groups i.e. - group I patients with standard 08 h fasting before anesthesia, group-II patients were given 400 ml and 200 ml of water 08 h and 2 h respectively before anesthesia, group III patients were given 400 ml water with 50 gms of glucose and 40 gm of glutamine 08 h before anesthesia and 200 ml water with 25 gms of glucose and 10 gm of glutamine 2 h before anesthesia, group IV patients were given 400 ml water with 50 gms of glucose 08 h before anesthesia and 200 ml water with 25 gms of glucose 2 h before anesthesia. Blood samples were collected pre-operatively and post-operatively. RESULTS Overall results suggest that Post-operative insulin resistance was greater in control patients (2.0 [0.3]) compared with the other 3 groups (placebo = 1.8 [0.9]); glutamine = (1.8 [0.6]); carbohydrate = (1.9 [0.6]). DISCUSSION This study shows that shortening of pre-operative fasting time for clear fluids until 2- h prior to anesthesia may induce a favorable environment for the post-operative course. In conclusion, Glutamine with carbohydrate drink can be used safely in surgical patients.
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Affiliation(s)
- Manpreet Singh
- Reader, Department of Oral & Maxillofacial Surgery, Kothiwal Dental College & Research Centre, Moradabad, Uttar Pradesh, 244001, India
| | - Manoj Chaudhary
- Head, Department of Oral & Maxillofacial Surgery, Kothiwal Dental College & Research Centre, Moradabad, Uttar Pradesh, 244001, India
| | - Arpit Vashistha
- Resident, Department of Oral & Maxillofacial Surgery, Kothiwal Dental College & Research Centre, Moradabad, Uttar Pradesh, 244001, India
| | - Gagandeep Kaur
- Reader, Department of Conservative Dentistry & Endodontics, Kothiwal Dental College & Research Centre, Moradabad, Uttar Pradesh, 244001, India
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Gebremedhn EG, Nagaratnam VB. Audit on preoperative fasting of elective surgical patients in an African academic medical center. World J Surg 2014; 38:2200-4. [PMID: 24748347 PMCID: PMC4124256 DOI: 10.1007/s00268-014-2582-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Preoperative fasting is a requisite before anesthesia. The main reason for preoperative fasting is to reduce gastric volume and acidity and thus decrease the risk of pulmonary aspiration. However, preoperative fasting is usually prolonged beyond the recommended time for various reasons. Despite the many adverse effects of prolonged fasting, patients sometimes fasted for a prolonged time when surgery was delayed for different reasons at the University of Gondar Hospital. The aim of this study was to assess the duration of preoperative fasting for elective surgery. METHODS A cross-sectional study was conducted from March 10 to April 10, 2013. Patients were interviewed 24 h after surgery. All 43 patients who were under anesthesia while operated on during the study period were included. RESULT Of the 43 patients included in the study, 35 were adults and 8 were children. The minimum, maximum, and mean fasting hours for food were 5, 96, and 19.60, respectively, and more than 50 % of the patients fasted from food twice as long as recommended. The minimum, maximum, and mean fasting hours for fluid were 5, 19, and 12.72, respectively. More than 95 % of the patients fasted from fluid longer than recommended. CONCLUSION Most patients fasted from both food (92 %) and fluid (95 %) longer than the fasting time recommended by the AAGBI, ASA, RCOA, and RCN fasting guidelines. Anesthetists, surgeons, and nurses need to revise operation lists every day in the operating theatres and resuscitate the patients when surgery is delayed for various reasons. A preoperative fasting guideline should be developed and implemented in the University of Gondar Hospital.
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Affiliation(s)
- Endale Gebreegziabher Gebremedhn
- Department of Anaesthesia, School of Medicine, College of Medicine and Health Sciences, University of Gondar, P.O. Box 196, Gonder, Ethiopia
| | - Vidhya Bates Nagaratnam
- Department of Anaesthesia, School of Medicine, College of Medicine and Health Sciences, University of Gondar, P.O. Box 196, Gonder, Ethiopia
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