Surgical Fires and Burns: A 5-Year Analysis of Medico-legal Cases

The occupational hazards of anesthesiologists: A literature review and evidence-based approach to prevention

BackgroundAn occupational hazard is any workplace condition that poses a risk to an employee's health. Occupational hazards are ubiquitous in the field of anesthesiology and often go underappreciated. These hazards warrant careful assessment and strategic preventative planning.ObjectiveThis narrative literature review examines the occupational hazards encountered by anesthesiologists and discusses evidence-based techniques to mitigate these risks. Facilitating the health and safety of anesthesia professionals protects not only the providers themselves but also enhances patient care by reducing the possibility of medical errors due to occupational fatigue, stress, and injuries.MethodsA targeted search of PubMed and other databases (SCOPUS, Web of Science) was used to review the literature. Safety standard handbooks by the International Atomic Energy Agency, The Pan American Health Organization, The World Health Organization, and Food and Agriculture of the United Nations, were also consulted to provide the current guidelines for hazards discussed. Articles and information were included if they provided information about the occupational hazards of anesthesiologists or evidence-based prevention techniques for mitigating the hazards.ResultsThe occupational hazards are classified into physical, chemical, and biological categories. Evidence-based preventive measures are proposed and examined for each category.ConclusionThis paper examines the challenges faced by anesthesiologists by categorizing the physical, chemical, and biological occupational hazards. Each identified hazard is accompanied by evidence-based strategies to mitigate its impact. By illuminating these issues, increased awareness among healthcare professionals, policymakers, and the public can foster a collective effort to improve the safety of the work of anesthesia providers.

[Strategies for Preventing Fires and Thermal Injuries in the Operating Room]

Thermal injuries and operating room fires pose significant risks to patients, especially when energy-based devices like monopolar diathermy are used. A study conducted by the FDA over 20 years reported over 3,500 injuries and 178 deaths, mostly caused by burns. The main causes of operating room fires can be explained by the "fire triangle": ignition sources, fuels, and oxidizers. Monopolar diathermy and lasers act as ignition sources, while alcohol-based disinfectants provide fuel. As oxidizers, oxygen and nitrous oxide further increase the risk of fire.This review is based on a literature analysis and case vignettes of patients with thermal injuries. It aims to highlight the severe consequences of such injuries and outline preventive measures.The findings underscore the need for a multidisciplinary approach. Key strategies include reducing oxygen concentration and using alternative disinfectants. Targeted training for the surgical team, along with the use of "Fire Risk Assessment Tools", can substantially improve patient safety.In conclusion, comprehensive risk management, the development of specific protocols, and team training are essential to prevent thermal injuries and sustainably reduce patient risk in the operating room.

Quality improvement lessons from Canadian thyroid and parathyroid surgery legal decisions

BACKGROUND

This is the first study of Canadian thyroid and parathyroid surgery legal decisions, and the first study of surgical malpractice using the Canadian Legal Information Institute (CanLII) database. The objective was to identify quality improvement opportunities in surgical practice, to increase patient safety and satisfaction.

METHODS

Legal decisions relating to thyroid and parathyroid surgery in the CanLII database were screened. Cases were included if a surgeon was listed as applicant or respondent; they related to pre-, intra-, or post-operative management of thyroid or parathyroid disease; and malpractice was alleged. Cases were excluded if surgery was mentioned incidentally or for non-surgical focus.

RESULTS

Of the 347 unique legal decisions screened, 14 met inclusion and exclusion criteria. Surgeries occurred between 1976 and 2012, with 13 thyroid surgeries, 1 parathyroidectomy, and 4 mortalities.

CONCLUSIONS

Quality improvement lessons include communication, pre-operative patient education and documentation of risks discussed, and in-person assessment of complications.

Development of an Improved LASER-Resistant Endotracheal Tube

OBJECTIVES

Surgical fires, particularly within Otolaryngology, remain a surprisingly frequent and devastating complication of laser-related surgery in the oropharynx and airway; Current estimates suggest anywhere from 200 to 600 surgical fires per year in the United States, with 20%-30% of these occurring as a complication of laser surgery and 90%-95% of these occurring in the head and neck region. Unfortunately, the complications of laser surgery in the airway may include respiratory failure, airway burns with stenosis, and may result in mortality. The most commonly utilized endotracheal tube for protection against inadvertent laser strikes, the Laser-Shield II tube (Medtronic), was removed from the commercial marketplace in 2016 after cases of airway fires were reported as a result of feature deficiencies in the product (FDA MAUDE Database review). Since the demise of the Laser-Shield II tube, alternatives such as the Mallinckrodt laser tube and handmade reinforced tubes have been utilized, although shortcomings in design and features have made these options less appealing to practicing Otolaryngologists. Creating a laser-safe endotracheal tube is critical for safe upper airway surgery. This paper evaluates new technologies, materials, and technical innovations in endotracheal tubes that may advance patient safety in laser-assisted Otolaryngology procedures.

STUDY TYPE

This paper evaluates new technologies, materials, and technical innovations in endotracheal tubes that may advance patient safety in laser-assisted Otolaryngology procedures.

METHODS

First, this article reviews the background of laser surgery in Otolaryngology and the consequent risk of surgical fire with resultant development of laser-resistant endotracheal tubes and commercial availability. Next, a review of claims and national database review of product failures related to previous laser-resistant endotracheal tubes is performed through the FDA MAUDE database. This includes an evaluation of cases: review of techniques in laser airway surgery including spontaneous ventilation, decreased O2 concentration, currently available endotracheal tubes including "handmade" fixes for perceived safety risks, and determination of failure points for previous laser-resistant endotracheal tubes. Third, the paper reviews the requested features of an "ideal" laser-resistant endotracheal tube. Finally, the paper reviews failure testing from an initial, unsuccessful attempt at material development and the consequent development of alternative technologies that address failure points from previous endotracheal tubes and addresses requested features with a detailed analysis of FDA-approval required testing. Extensive lab testing of the new tube predicts a significant reduction of risk in vivo with inability to perforate the shaft or cuff of the tubes under standard working conditions.

RESULTS

While no iteration of a laser-resistant endotracheal tube is entirely laser safe, advances in technology can improve the safety profile of these devices. The new tube contains a double cuff, a soft and flexible shaft to minimize laryngeal insertion trauma, a smooth external surface, a tight-to-shaft balloon, and methylene blue dye in the cuff to alert the user to inadvertent penetration. These characteristics were the most requested by laryngologists in the development of a new laser-resistant tube. The newest endotracheal tube brings the features most requested by Otolaryngologists in a laser-resistant tube, and improves the safety profile over previous tubes.

CONCLUSION

Development of a new endotracheal tube represents an advancement in safety for the Otolaryngologist in laser airway surgery. Understanding the previous history and the science behind surgical fire formation is essential in advancing safety for patients in the future.

LEVEL OF EVIDENCE

N/A Laryngoscope, 134:S1-S12, 2024.

Routinely collected burn clinical data in Canada: Determining the knowledge gap

Unlike other developed countries that hold national burn registries to monitor burn injury and care, Canada relies on single-centre secondary datasets and administrative databases as surveillance mechanisms. The objective of this study was to determine the knowledge gap faced in Canada for not having a dedicated burn registry. A comprehensive scoping review was conducted to identify the burn literature that has arisen from secondary datasets in Canada. Literature of all study designs was included with the exception of case reports and cases series. Once data extraction was concluded, a thematic framework was constructed based on the information that arose from nations that hold national burn registries. Eighty-eight studies were included. Twelve studies arose from national datasets, and 18 from provincial databases, most of which were from Ontario and British Columbia. Only seven studies were conducted using a combination of Canadian units' single-centre datasets. The majority of included studies (58%) resulted from non-collaborative use of single-centre secondary datasets. Research efforts were predominantly conducted by burn units in Ontario, British Columbia, Manitoba and Alberta. A significant number of the included studies were outdated and several provinces/territories had no published burn data whatsoever. Efforts should be made towards the development of systems to surveil burn injury and care in Canada. This study supports the development of a nation-wide burn registry to bridge this knowledge gap.

Microlaryngeal Laser Surgery Using High-flow Nasal Ventilation at Two Oxygen Concentration Deliveries

OBJECTIVES

Ventilation using 100% oxygenation creates a risk of fire during laser microlaryngeal surgery (MLS). The purpose of this study is to describe the technique of transnasal high-flow ventilation using laser safe (30%) oxygen conditions, measure the intraoperative real-time laryngeal oxygen concentration, and examine patient saturation status using this technique.

METHODS

Prospective IRB approved study of patients undergoing tubeless laser MLS using high-flow nasal oxygenation. Delivered oxygen concentration was reduced from 100% to 30% before lasering using an oxygen-air blender then increased to 100% post-laser procedure. Outcome measures included time for laryngeal oxygen concentration to equalize to laser safe levels; time to, methods of and duration of rescue ventilation; and desaturation rates and apnoeic times at both 100% and 30% oxygen deliveries.

RESULTS

Fifty patients were recruited (mean age = 47.4 years). Mean laryngeal oxygen concentration (%) at 100% and 30% deliveries was 98.46 and 31.45, respectively. Mean (SD) of laryngeal oxygen concentration equalization time to 30% (seconds) was 9.4 (3.69). At 30% oxygen delivery desaturation rate was faster and apneic time shorter compared with 100%. Eighteen patients required rescue (jet) ventilation and they had a faster apneic desaturation rate (%/minute) than patients not requiring rescue. Mean (SD) apneic time (minutes) at 30% delivery was 4.56 (2.25) and 4.41 (2.18) in rescue versus non-rescue groups respectively. BMI was the only significant predictor of desaturation rate at 30% oxygen delivery.

CONCLUSION

It is possible to achieve a safe time window for use of laser during MLS using transnasal humidified high-flow ventilation by delivering 30% oxygen concentration.

LEVEL OF EVIDENCE

4 Laryngoscope, 133:634-639, 2023.

Surgical Fire in the United States: 2000-2020

BACKGROUND

Despite fire prevention protocols and perioperative staff training, surgical fires continue to cause patient harm, disability, and death.

METHODS

We identified surgical fires that were reported to the Food and Drug Administration's Manufacturer and User Facility Device Experience database between 2000 and 2020 that resulted in patient or surgical personnel harm. Quantitative and descriptive content analyses were performed on free-text responses to identify contributing factors of surgical fire patient and personnel harm events.

RESULTS

We identified 565 surgical fire events resulting in patient or surgical personnel harm over a 20-year study period (median 25 events/year; range, 8-53). Surgical fires were significantly more likely to occur during upper aerodigestive tract (unadjusted odds ratio 15.96; 95% confidence interval, 11.93-21.34) and head and neck (unadjusted odds ratio 5.47; confidence interval 4.14-7.22) procedures compared with abdomen and pelvis procedures. Upper aerodigestive tract and head and neck procedures had the highest incidence of life-threatening injury (41% and 21%, respectively). An electrosurgical device was the ignition source in 82% of events. Content analysis revealed 7 common categories identified as root causes of surgical fires: preparation of surgical site (n = 55, 29%); device malfunction (n = 51, 26%), surgical accident (n = 47, 24%), medical judgement (n = 44 reports, 23%), equipment care and handling (n = 18, 9%), patient factors (n = 10, 5%), and communication (n = 3, 2%).

CONCLUSION

Surgical fires resulting in harm to patient and surgical personnel continue to occur. The common themes identified in this study will prepare and empower surgeons and surgical personnel to prevent surgical fires in the future.