Kernohan-Woltman Notch Phenomenon in Chronic Subdural Hematoma: An under-Diagnosed Phenomenon?

Introduction: Kernohan-Woltman notch phenomenon is a neurological picture of mydriasis and hemiparesis/ hemiplegia ipsilateral to a supratentorial mass lesion causing compression of the contralateral cerebral peduncle against the tentorial edge. The aim of this paper is to report series of cases from a low volume centre of neurosurgical care and highlight the fact that Kernohan’s notch phenomenon, although, reported to be quite rare but it’s not uncommon and to also look out for this phenomenon to avoid wrong site surgeries. Presentation of Cases: We report four cases of chronic subdural hematoma presenting with Kernohan- Woltmann notch phenomenon. The patients include: a young alcoholic who was found in a gutter after binge drinking, a middle aged man who was accidentally hit on the head with a car tire jack, an elderly female with no history of trauma, a fall nor use of anticoagulant and an elderly male, a diabetic. All four patients had emergency burr hole and drainage of subdural hematoma. Discussion: This incidence of this phenomenon among patients with chronic subdural hematoma is rarely reported in the literature, however, a low volume centre for neurosurgical services like ours has seen five cases in a short period of time. Conclusion: This paradoxical neurological sign is probably under-diagnosed judging from the number of cases diagnosed in a low volume center like ours.

What do we Know about Contributing Factors for “Never Events” in Operating Rooms? A Machine Learning Analysis

BackgroundA Surgical “Never Event” (NE) is a preventable error. Various factors contribute to the occurrence of wrong site surgery and retained foreign item, but little is known about their quantified risk in relation to surgery's characteristics. Our study uses machine learning to reveal factors and quantify their risk to improve patient safety and quality of care.MethodsWe used data from 9,234 observations on safety standards and 101 Root-Cause Analysis from actual NEs, and utilized three Random Forest supervised machine learning models. Using a standard 10-cross validation technique, we evaluated the model's metrics, and, through Gini impurity we measured the impact of factors thereof to occurrence of the two types of NEs. ResultsWe identified 24 contributing factors in six surgical departments. Two had an impact of >900% in Urology, Orthopedics and General Surgery, six had an impact of 0–900% in Gynecology, Urology and Cardiology, and 17 had an impact of <0%. Factors' combination revealed 15-20 pairs with an increased probability in five departments: Gynecology:875–1900%; Urology: 1,900:2,600%; Cardiology:833–1,500%; Orthopedics:1,825–4,225%; and General Surgery:2,720–13,600%. Five factors affected the occurrence of wrong site surgery (-60.96–503.92%) and five of retained foreign body (-74.65–151.43%), three of them overlapping: two nurses (66.26–87.92%), Surgery length<1 hour (85.56–122.91%), Surgery length 1-2 hours (-60.96–85.56%).ConclusionsThe use of machine learning has enabled us to quantify the potential impact of risk factors for wrong site surgeries and retained foreign items, in relation to surgery's characteristics, which in turn suggests tailoring the safety standards accordingly. Trial registration number: MOH 032-2019

EP.TH.26Identification of Common Themes from Never Events Data Published by NHS England

Background Never events (NEs) are serious clinical incidents that cause potentially avoidable harm and impose a significant financial burden on healthcare systems. The purpose of this study was to identify common never events. Methods We analysed the NHS England NE data from 2012 to 2020 to identify common never events category and themes. Results We identified 51 common NE themes in 4 main categories out of a total of 3247 NE reported during this period. Wrong-site surgery was the most common category (n = 1307;40.25%)) followed by retained foreign objects (n = 901;27.75%); wrong implant or prosthesis (n = 425;13.09%); and non-surgical/infrequent ones (n = 614;18.9%). Wrong-side and wrong tooth removal were the most common wrong-site NE accounting for 300 (22.95%) and 263 (20.12%) incidents, respectively. There were 197 (15%) wrong-site blocks, 125 (9.56%) wrong procedures, and 96 (7.3%) wrong skin lesions excised. Vaginal swabs were the most commonly retained items (276;30.63%) followed by surgical swabs (164;18.20%) and guidewires (152;16.87%). There were 67 (7.44%) incidents of retained parts of instruments and 48 (5.33%) retained instruments. Wrong intraocular lenses (165;38.82%) were the most common wrong implants followed by wrong hip prostheses (n = 94;22.11%) and wrong knees (n = 91;21.41%). Non-surgical events accounted for 18.9% (n = 614) of the total incidents. Misplaced naso-or oro-gastric tubes (n = 178;29%) and wrong-route administration of medications were the most common events in this category (n = 111;18%), followed by unintentional connection of a patient requiring oxygen to an air flow-meter (n = 93;15%). Conclusion This paper identifies common NE categories and themes. Awareness of these might help reduce their incidence.

EP.TH.25Common General Surgical Never Events: An In-depth Analysis of Never Events data held by NHS England

Background There is little available data on common general surgical NE. Lack of this information may have affected our attempts to reduce the incidence of these potentially serious clinical incidents. The purpose of this study was to identify common general surgical NE from the data held by the National Health Service (NHS) England. Methods We analyzed NHS England NE data from April 2012 to February 2020 to identify common general surgical NE. Results There was a total of 797 general surgical NE identified under three main categories of Wrong-Site Surgery (n = 427;53.58%), Retained Items Post-Procedure (n = 355;44.54%) and Wrong Implant/Prosthesis and (n = 15;1.88%). We identified a total of 56 common general surgical themes - 25 each in Wrong-Site Surgery and Retained Foreign Body category and 6 in wrong implants. Wrong skin condition surgery was the commonest wrong-site surgery (n = 117;27.4%). There were 18 wrong side chest drains (4.2%) and 18 (4.2%) wrong side angioplasty/angiogram. There were 7 (1.6%) instances of confusion in pilonidal/perianal/perineal surgeries and 6 (1.4%) instances of biopsy of cervix rather than colon or rectum. Retained surgical swabs were the most common retained items (n = 165;46.5%). There were 28 (7.9%) laparoscopic retrieval bags with or without the specimen, 26 (7.3%) chest drain guidewires, 26 (7.3%) surgical needles; and 9 (2.5%) surgical drains. Wrong stents were the most common (n = 9;60%) wrong implant followed by wrong breast implants (n = 2;13.3%). Conclusion This study found 56 common general surgical Never Events. Increased awareness of these common themes of NE may ultimately help reduce their incidence.

SP7.1.5 Common General Surgical Never Events: Analysis of NHS England Never Events Data

Background There is little available data on common general surgical Never Events (NE). Lack of this information may have affected our attempts to reduce the incidence of these potentially serious clinical incidents. The purpose of this study was to identify common general surgical NE from the data held by the NHS England. Methods We analysed NHS England NE data from April 2012 to February 2020 to identify common general surgical NE. Results There was a total of 797 general surgical NE identified under three main categories of Wrong-Site Surgery (n = 427;53.58%), Retained Items Post-Procedure (n = 355; 44.54%), and Wrong Implant/ Prosthesis and (n = 15; 1.88%). We identified a total of 56 common general surgical themes - 25 each in the Wrong-Site Surgery and Retained Foreign Body category and 6 in wrong implants. Wrong skin condition surgery was the commonest wrong-site surgery (n = 117; 27.4%). There were 18 wrong side chest drains (4.2%) and 18 (4.2%) wrong side angioplasty/angiogram. There were 7 (1.6%) instances of confusion in pilonidal/perianal/perineal surgeries and 6 (1.4%) instances of biopsy of cervix rather than colon or rectum. Retained surgical swabs were the most common retained items (n = 165;46.5%). There were 28 (7.9%) laparoscopic retrieval bags with or without the specimen, 26 (7.3%) chest drain guidewires, 26 (7.3%) surgical needles; and 9 (2.5%) surgical drains. Wrong stents were most common (n = 9;60%) wrong implant followed by wrong breast implants (n = 2;13.3%). Conclusion This study found 56 common general surgical NE. Increased awareness of these common themes of NE may help reduce their incidence.

A perspective on wrong level, wrong side, and wrong site spine surgery

Background: Four of the most common “errors” in spine surgery include: operating on the wrong patient, doing the wrong procedure, performing wrong-level surgery (WLS), and/or performing wrong-sided surgery (WSS). Although preoperative verification protocols (i.e. Universal Protocol, routine Time-Outs, and using the 3 R’s (i.e. right patient, right procedure, right level/side)) have largely limited the first two “errors,” WLS and WSS still occur with an unacceptably high frequency. Methods: In 20 studies, we identified the predominant factors contributing to WLS/WSS; unusual/anatomical anomalies/variants (i.e. sacralized lumbar vertebrae. lumbarized sacral vertebra, Klippel-Feil vertebrae, block vertebrae, butterfly vertebrae, obesity/morbid obesity), inadequate/poor interpretation of X-rays/fluoroscopic intraoperative images, and failure to follow different verification protocols. Results: “Human error” was another major risk factor contributing to the failure to operate at the correct level/side (WLS/WSS). Factors comprising “human error” included; surgeon/staff fatigue, rushing, emergency circumstances, lack of communication, hierarchical behavior in the operating room, and failure to “speak up”. Conclusion: Utilizing the Universal Protocol, routine Time Outs, and the 3 R’s largelly avoid operating on the wrong spine patient, and performing the wrong procedure. However, these guidelines have not yet sufficiently reduced the frequently of WLS and WSS. Greater recognition of the potential pitfalls contributing to WLS/WSS as reviewed in this perspective should better equip spine surgeons to avert/limit such “errors” in the future.

Analysis and outcomes of wrong site thyroid surgery

Background In thyroid surgery, wrong-site surgery (WSS) is considered a rare event and seldom reported in the literature. Case presentation This report presents 5 WSS cases following thyroid surgery in a 20-year period. We stratified the subtypes of WSS in wrong target, wrong side, wrong procedure and wrong patient. Only planned and elective thyroid surgeries present WSS cases. The interventions were performed in low-volume hospitals, and subsequently, the patients were referred to our centres. Four cases of wrong-target procedures (thymectomies [n = 3] and lymph node excision [n = 1] performed instead of thyroidectomies) and one case of wrong-side procedure were observed in this study. Two wrong target cases resulting additionally in wrong procedure were noted. Wrong patient cases were not detected in the review. Patients experienced benign, malignant, or suspicious pathology and underwent traditional surgery (no endoscopic or robotic surgery). 40% of WSS led to legal action against the surgeon or a monetary settlement. Conclusion WSS is also observed in thyroid surgery. Considering that reports regarding the serious complications of WSS are not yet available, these complications should be discussed with the surgical community. Etiologic causes, outcomes, preventive strategies of WSS and expert opinion are presented.