The impact of noise in the operating theatre: a review of the evidence

Noise, Distractions, and Hazards in the Operating Room

Anesthesiologists are perioperative leaders of patient and health care team safety. The anesthesiologist needs to remain vigilant in the perioperative setting and while caring for patients. The ability to navigate increased noise levels, distractions, and hazards is crucial for maintaining a safe environment. While some noise, such as music, can have benefits, overall noise levels can distract from patient care and have adverse effects on patient care and intraoperative staff. This study provides an overview of noise, distractions, and hazards in the perioperative environment.

Reduction of Noise Levels During Caesarean Births Through Audiovisual Feedback is Associated With Lower Stress Levels for Patients

OBJECTIVE

Noise reduction during surgical procedures leads to improved surgical performance and results. The caesarean birth (CB) is an exceptional operation and a life changing experience. Through the introduction of staff education and implementation of audiovisual feedback, we intended to reduce noise, and subsequently reduce surgical complications and increase the well-being of patients and staff.

METHODS

During Phase I, blinded baseline measurements of noise were conducted. Phase II started after staff education and structured questionnaires on subjective noise and stress were added, and in Phase III audiovisual feedback was introduced. Mean and peak noise levels over the time of the procedure were obtained in A-weighted decibels (dB(A)). Kruskal-Wallis H tests were performed to evaluate the impact of interventions on noise levels. Questionnaires were evaluated using descriptive statistics; stress-scores were compared using independent sample t-tests.

RESULTS

Ninety planned CBs were included. Median noise levels were 62.85 dB(A) at baseline. They decreased significantly to 60.60 dB(A) (Phase II) and 59.25 dB(A) (Phase III), respectively. This reduction of 3.6 dB(A) leads to a subjective noise reduction of around 20%. Significant differences for A-weighted and peak noise levels during actual surgery were found after combining staff education with audiovisual feedback. In Phase III, staff reported less stressful noise. Stress also decreased significantly in the patient group. Beeping machines and telephones were identified as the most stressful sources of noise.

CONCLUSION

We show that noise reduction during CB is both necessary and possible. Diminished subjective perception of noise and stress are positive impacts of this intervention. Staff education and audiovisual feedback can help to provide a calm and lower stress environment for patients and staff during caesarean births.

Impact of Operative Room Noise on Laparoscopic Performance-A Prospective, Randomized Crossover Trial

INTRODUCTION

Surgeons are often exposed to different types of operative room (OR) noise, for instance machine alarms, phone calls, and interacting objects. The aim of this study was to evaluate the effect of OR noise on the surgeons' laparoscopic performance.

METHODS

A total of 30 laparoscopic novices participated in this single-center, prospective, randomized cross-over trial after completing a standardized laparoscopic training until reaching proficiency. Afterward, all participants performed four different laparoscopic tasks (peg transfer, circle cutting, balloon resection, suture, and knot) twice, once under noise exposure (intervention group), and once without any noise (control group). Primary endpoints were the force exertion and motion analyses. To assess the psychological workload the NASA task load index score was used.

RESULTS

The error rates varied and were significantly different between the noise and the control group. More complex tasks like the circle cutting and suture and knot task revealed higher error rates concerning precision (circle cutting: P < 0.01; suture and knot: P < 0.01). In line with increased error rates in the circle cutting task, increased NASA task load index scores were observed in this task (P = 0.03). However, no significant differences were found in force parameters, such as the maximal force exertion (peg transfer: P = 0.43; circle cutting: P = 0.54; balloon resection: P = 0.64; suture and knot: P = 0.63) and the mean force exertion (peg transfer: P = 0.43; circle cutting: P = 0.54; balloon resection: P = 0.64; suture and knot: P = 0.63) between the groups.

CONCLUSIONS

Exposure to normal OR noise led to higher error rates in two of four tasks. This effect could be linked to an increased psychological workload that was present under normal OR noise exposure. However, normal OR noise does not appear to impact surgical novices' laparoscopic task performance regarding applied forces and instrument motion.

A Randomized Controlled Trial of 2% Chlorhexidine Gluconate Skin Preparation Cloths for the Prevention of Surgical Site Infections in Adults Undergoing Spine Surgeries: Residual Reduction in Skin Bacterial Load for 4 Days

Background

Surgical site infections (SSI) result in increased morbidity and mortality, prolonged recovery, longer hospital length of stay for medication or possible additional surgeries, and escalated health care costs. The purpose of this randomized controlled trial was to compare SSI rates and overall skin flora burden between those using chlorhexidine (CHG) cloths versus soap and water preoperatively in the adult spine surgery population.

Methods

Subjects were randomized preoperatively to use 2% CHG cloths versus soap and water the night before and morning of surgery prior to the operation. A skin culture was obtained at enrollment prior to any cleansing, again at post-operation day 4 or hospital discharge (whichever came first), and finally at the surgeons' postoperative visits. A blinded advanced practice nurse served as the assessor for SSI.

Results

Those enrolled in the research arm had more growth on their screening skin culture than the control arm (P = .02). While there was no difference in rates of SSI between groups, the CHG group had lower skin flora burden at hospital discharge (P = .004), indicating residual protection.

Conclusion

Surgical incisions are most vulnerable to bacterial entry prior to 72 hours post-operation before completion of epithelialization, which establishes a barrier from microbes. The use of CHG, which has a residual impact for up to 4 days, could offer additional risk reduction for SSI development.

Noise in the operating room coincides with surgical difficulty

BACKGROUND

Noise in the operating room has been shown to distract the surgical team and to be associated with postoperative complications. It is, however, unclear whether complications after noisy operations are the result of objective or subjective surgical difficulty or the consequence of distraction of the operating room team by noise.

METHODS

Noise level measurements were prospectively performed during operations in four Swiss hospitals. Objective difficulty for each operation was calculated based on surgical magnitude as suggested by the Physiological and Operative Severity Score for the enUmeration of Mortality and Morbidity (POSSUM), duration of operation and surgical approach. Subjective difficulty and distraction were evaluated by a questionnaire filled out by the operating room team members. Complications were assessed 30 days after surgery. Using regression analyses, the relationship between objective and subjective difficulty, distraction, intraoperative noise and postoperative complications was tested.

RESULTS

Postoperative complications occurred after 121 (38%) of the 294 procedures included. Noise levels were significantly higher in operations that were objectively and subjectively more difficult (59.89 versus 58.35 dB(A), P < 0.001) and operations that resulted in postoperative complications (59.05 versus 58.77 dB(A), P = 0.004). Multivariable regression analyses revealed that subjective difficulty as reported by all members of the surgical team, but not distraction, was highly associated with noise and complications. Only objective surgical difficulty independently predicted noise and postoperative complications.

CONCLUSION

Noise in the operating room is a surrogate of surgical difficulty and thereby predicts postoperative complications.

Leading Through Noise: Operating Room Noise Challenges for Staff and Leadership Techniques to Ensure Optimal Operational Performance

Noise and distractions in the operating room (OR) critically impact surgical performance and patient outcomes, particularly in high-stakes environments such as trauma surgery. While historical hospital environments prioritized quiet to facilitate recovery and reduce stress, contemporary ORs, especially those handling trauma cases, face increasing noise challenges due to advanced surgical instruments, alarms, and staff conversations, often surpassing federal exposure limits. This review investigates OR noise sources, including staff activities and equipment, analyzing their effects on cognitive load, communication, and error rates among healthcare workers. It identifies high-risk scenarios and vulnerable groups, highlighting the necessity for targeted interventions. Key strategies include implementing strict noise control policies, using noise-reducing materials in OR design, and educating staff on noise impacts. Additionally, structured communication protocols and continuous monitoring systems are advocated to enhance operational efficiency and safety. Surgeon leadership is pivotal in balancing assertiveness and empathy to maintain a productive team dynamic. Furthermore, surgeons significantly boost OR efficiency and safety by adopting these protocols, promoting inclusive team dynamics, and applying noise-reduction strategies. These practices safeguard patient care and foster a more collaborative work atmosphere, aligning all team efforts toward optimal patient outcomes. This holistic approach emphasizes the need for continuous improvement and adaptability in surgical practices to meet modern healthcare demands, particularly in trauma surgery's fast-paced, unpredictable realm. Collectively, these measures can enhance patient safety and improve conditions for surgical teams, providing a framework for quieter, more focused OR environments that ultimately elevate surgical outcomes and healthcare quality.

Can Operating Room Design Make Orthopedic Surgeries Shorter, Safer, and More Efficient?: A Quasi-Experimental Study

OBJECTIVES

The study aimed to fill the knowledge gap about how operating room (OR) design could reduce orthopedic surgery duration and contribute to surgical care safety and efficiency.

BACKGROUND

Long surgery duration may lead to delays and cancellations of surgeries, deteriorated patient experiences, postoperative complications, and waste of healthcare resources. The OR physical environment may contribute to the reduction of surgery duration by minimizing workflow disruptions and personnel movements during surgeries.

METHODS

Unobtrusive observations were conducted of 70 unilateral total knee or hip replacement surgeries in two differently designed ORs at a community hospital in the United States. A set of computer-based forms adapted from recent research was used to measure the surgery duration, environment-related disruptions, and ambulatory movements involving circulators. Potential confounding factors like surgery type were controlled in statistical analyses.

RESULTS

Significantly shorter surgery durations were recorded in the larger OR with more clearances on both sides of the operating table, a wider door located on the sidewall, more cabinets, and more clearance between the circulator workstation and the sterile field (p =.019). The better-designed OR was also associated with less frequent disruptions and fewer movements per case (p < .001). Significant correlations existed between surgery duration, the number of disruptions, and the number of movements (rs = .576-.700, ps < .001).

CONCLUSIONS

The study demonstrated the important role of OR physical environment in supporting the safe and efficient delivery of surgical care, which should be further enhanced through research and design innovations.

A pilot study of performance enhancement coaching for newly appointed urology registrars

OBJECTIVES

To assess the feasibility of performance enhancement coaching (PEC) for newly appointed Urology registrars (ST3s), specifically: whether the concept appealed, and which areas beyond technical skills acquisition were felt to be most relevant or useful.

SUBJECTS AND METHODS

All delegates on the Urology Bootcamp 2023 were invited to take part in an online survey before and after a 2-hour PEC workshop, collecting: basic demographic data, performance challenges, and the important aspects to include in, and consider with, a coaching programme. The workshop was delivered by a surgeon with a professional coaching qualification, to groups of four delegates at a time over 4 days. Ten pre-defined areas were offered during the session.

RESULTS

On a scale of 1 (poor) to 10 (excellent), the 62 participants' overall health was reported as a median of 8/10 (physical) and 7/10 (mental). Anxiety during performance was the most common concern (63%) and was accompanied by a tremor in 55%. The next most popular concerns, with 19% of responses each, were: sleep, insufficient operative skill or expertise, and worry about relationships with trainers. The commonest topics discussed were 'the inner critic' (100%), 'autonomic modulation' (69%), 'not working, well' (13%) and 'optimising study' (6%). Seventy-seven per cent were unaware of PEC for practising surgeons. All respondents felt that they would benefit from PEC to some extent (80% ≥8/10 where 10/10 was 'very useful'), ideally at the ST3 level. Sixty-two percent of respondents said there should be a fee for trainees, whereas 38% thought it should be free and paid for by their training authorities.

CONCLUSION

The concept of PEC is acceptable to ST3 Urology trainees, with particular interest in techniques to mitigate negative self-talk and autonomic modulation techniques. Existing barriers to coaching for the surgical community would need to be addressed in designing an acceptable coaching programme.

Effect of Noise Management in Interventional Radiology Suites on Patients Undergoing Transarterial Chemoembolization: A Retrospective Study

OBJECTIVE

This study aims to evaluate the effect of noise management in interventional radiology suites on patients undergoing transarterial chemoembolization (TACE).

METHODS

A retrospective cohort study design was employed. The study included a total of 141 patients with hepatocellular carcinoma who underwent TACE surgery in interventional radiology suite of the First People's Hospital of Nantong from January 2022 to December 2022. The patients were divided into an observation group (received noise management, n = 70) and a control group (did not receive noise management, n = 71) on the basis of whether they received noise management. Patient demographics and surgical data were collected, and heart rate, blood pressure, and anxiety levels were assessed before, during and after surgery. Satisfaction and the incidence of adverse reactions were also documented.

RESULTS

No significant differences were found in general characteristics. The comparison between the observation and control groups revealed statistically significant differences in noise levels (P < 0.001). Additionally, anxiety levels significantly differed between the two groups (P = 0.040) as well as across different time points (P < 0.001). However, no significant difference was found in the occurrence of adverse events between groups (P = 0.772). Furthermore, patient satisfaction was significantly higher in the observation group than that in the control group (P < 0.001). Although no significant differences were found in heart rate and systolic blood pressure between groups (P > 0.05), and a significant main effect of time was observed for both variables (P < 0.001).

CONCLUSION

Noise management in the interventional radiology suite effectively alleviates intraoperative anxiety among patients with TACE and improves treatment satisfaction but has no significant effect on physiological changes and the incidence of adverse events.

Too loud to hear myself think: deleterious effects of noise in the operating room

Noise is part of daily life in the operating room, and too often is viewed as a necessary evil. However, much of the noise in operating rooms (ORs) is unnecessary, such as extraneous conversations and music, and could be reduced. At the least, noise is known to increase staff stress and to hamper effective communication; at the worst, it adversely affects patient outcomes. Every member of the OR team should be cognisant of this and work to reduce unnecessary noise.

Effect of intraoperative noise on postoperative pain in surgery patients under general anesthesia: evidence from a prospective study and mouse model

BACKGROUND

Most patients are in a noisy environment during abdominal surgery under general anesthesia. This study included patients who underwent abdominal surgery under general anesthesia and established an animal model to determine whether intraoperative noise affects postoperative pain.

MATERIALS AND METHODS

This prospective study included 200 patients who underwent abdominal surgery under general anesthesia. Intraoperative noise and electroencephalograms were continuously recorded, and the mean level and time proportion of noise intensity of greater than 70 dB were calculated. Maximum postoperative pain was assessed using a numerical rating scale at 0-12 h and 12-24 h after surgery, and postoperative analgesia consumption in patients receiving patient-controlled intravenous analgesia was recorded. Postoperative pain intensity and electroencephalogram amplitude were compared between patients with high-noise exposure (time proportion of noise intensity greater than 70 dB ≥40%) and low-noise exposure (<40%). Mechanical pain sensitivity was tested in two groups of mice with plantar incisions exposed to 40 dB or 70-100 dB.

RESULTS

The time proportion of noise intensity greater than 70 dB was identified as an independent risk factor for postoperative pain intensity ( P <0.001). P ain numerical rating scale 0-12 h (4.5±1.5 vs. 3.7±1.3, P =0.001) and 12-24 h (3.9±1.5 vs. 3.2±1.1, P =0.004) after surgery in patients with high-noise exposure was significantly higher than in patients with low-noise exposure. The electroencephalogram amplitude of patients with high-noise exposure was significantly lower than that of patients with low-noise exposure ( P <0.05). In the mouse model, mechanical hyperalgesia in the 70-100 dB group was significantly greater than that in the 40 dB group ( P <0.001).

CONCLUSION

High-level intraoperative noise exposure aggravates the degree of postoperative pain and analgesic needs of patients undergoing abdominal surgery, which may be related to the impact of noise on the neurophysiological activity of the brain and postoperative hyperalgesia.

Music in the Operating Room: Comparing the Opinions of Surgeons, Anesthesiologists, and Nurses

BACKGROUND

Music is part of operating room (OR) culture; however, some personnel may perceive music as a distraction.

METHODS

A single institution survey of surgeons (SURG), anesthesia (ANES), and nursing (NURS) regarding attitudes on music in the OR.

RESULTS

There were 222 responses (67% response rate) agreeing that music in the OR should be allowed (91%), is calming (75%), and helps with focus (63%). Most did not feel music was distracting (63%) or unsafe (80%). SURG were more likely to state that surgeons should decide (46.7%) if music should be played, whereas ANES and NURS (81%) were more likely to feel decisions should be made collaboratively (P < .001).

CONCLUSION

Most OR personnel feel positively towards music. Surgeons were more likely to believe the decision to play music should be the surgeon's choice. The majority of OR staff agreed with collaborative decision-making, aligning with creating a safe OR culture.

Guidelines on human factors in critical situations 2023

OBJECTIVE

To provide guidelines to define the place of human factors in the management of critical situations in anaesthesia and critical care.

DESIGN

A committee of nineteen experts from the SFAR and GFHS learned societies was set up. A policy of declaration of links of interest was applied and respected throughout the guideline-producing process. Likewise, the committee did not benefit from any funding from a company marketing a health product (drug or medical device). The committee followed the GRADE® method (Grading of Recommendations Assessment, Development and Evaluation) to assess the quality of the evidence on which the recommendations were based.

METHODS

We aimed to formulate recommendations according to the GRADE® methodology for four different fields: 1/ communication, 2/ organisation, 3/ working environment and 4/ training. Each question was formulated according to the PICO format (Patients, Intervention, Comparison, Outcome). The literature review and recommendations were formulated according to the GRADE® methodology.

RESULTS

The experts' synthesis work and application of the GRADE® method resulted in 21 recommendations. Since the GRADE® method could not be applied in its entirety to all the questions, the guidelines used the SFAR "Recommendations for Professional Practice" A means of secured communication (RPP) format and the recommendations were formulated as expert opinions.

CONCLUSION

Based on strong agreement between experts, we were able to produce 21 recommendations to guide human factors in critical situations.

Augmented reality during parotid surgery: real-life evaluation of voice control of a head mounted display

PURPOSE

Augmented Reality can improve surgical planning and performance in parotid surgery. For easier application we implemented a voice control manual for our augmented reality system. The aim of the study was to evaluate the feasibility of the voice control in real-life situations.

METHODS

We used the HoloLens 1^® (Microsoft Corporation) with a special speech recognition software for parotid surgery. The evaluation took place in a audiometry cubicle and during real surgical procedures. Voice commands were used to display various 3D structures of the patient with the HoloLens 1^®. Commands had different variations (male/female, 65 dB SPL)/louder, various structures).

RESULTS

In silence, 100% of commands were recognized. If the volume of the operation room (OR) background noise exceeds 42 dB, the recognition rate decreases significantly, and it drops below 40% at > 60 dB SPL. With constant speech volume at 65 dB SPL male speakers had a significant better recognition rate than female speakers (p = 0.046). Higher speech volumes can compensate this effect. The recognition rate depends on the type of background noise. Mixed OR noise (52 dB(A)) reduced the detection rate significantly compared to single suction noise at 52 dB(A) (p ≤ 0.00001). The recognition rate was significantly better in the OR than in the audio cubicle (p = 0.00013 both genders, 0.0086 female, and 0.0036 male).

CONCLUSIONS

The recognition rate of voice commands can be enhanced by increasing the speech volume and by singularizing ambient noises. The detection rate depends on the loudness of the OR noise. Male voices are understood significantly better than female voices.

Failed Attempt to Recommend Noise Cancelling Headphones for Knee Arthroplasty Surgeons-Results of a Pilot Study

Background and Objectives: Noise exposure during total knee arthroplasty (TKA) has been demonstrated to exceed thresholds that are deemed as over-exposure by industry noise level standards. With orthopedic surgeons being at risk of suffering from Noise Induced Hearing Loss, the purpose of this pilot study was to evaluate the viability of the use of industry grade active noise cancelling headphones (ANCH) during TKA. Material and Methods: In this prospective pilot study, 10 TKA were performed. In five of these cases, surgeon, assistant, scrub nurse and anesthetist wore ANCH with automatic noise level dependent noise attenuation above 82 dB. A validated 14-item questionnaire was used after each case to evaluate the quality of communication, performance, teamwork and mental load. In seven cases a calibrated sound level meter was used to measure the operating theatre noise. Peak sound level (LApeak), A-weighted continuous sound level (LAeq) and A-weighted noise exposure averaged for an 8-h time-period (LEPd) were calculated. Results: There was no perceived benefit of ANCH for the surgeons (p = 0.648), assistants (p = 0.908) and scrub nurses (p = 0.251). There was an overall improvement observed by anesthetists (p = 0.001). A worse communication while wearing ANCH was reported by surgeons but not by the rest of the team. Average LApeak was 90.6 ± 3.2 dB(C), LAeq was 61.9 ± 1.0 dB(A) and LEPd was 53.2 ± 1.2 dB(A). Conclusions: Industry grade ANCH seem to provide no benefit for surgeons, assistants and scrub nurses during TKA, while anesthesiologists seem to benefit from the use of ANCH during TKA. Due to the limitations of this pilot study, further studies with larger study populations are necessary to adequately investigate the use of ANCH during TKA.

Operating Room Performance Optimization Metrics: a Systematic Review

Literature proposes numerous initiatives for optimization of the Operating Room (OR). Despite multiple suggested strategies for the optimization of workflow on the OR, its patients and (medical) staff, no uniform description of 'optimization' has been adopted. This makes it difficult to evaluate the proposed optimization strategies. In particular, the metrics used to quantify OR performance are diverse so that assessing the impact of suggested approaches is complex or even impossible. To secure a higher implementation success rate of optimisation strategies in practice we believe OR optimisation and its quantification should be further investigated. We aim to provide an inventory of the metrics and methods used to optimise the OR by the means of a structured literature study. We observe that several aspects of OR performance are unaddressed in literature, and no studies account for possible interactions between metrics of quality and efficiency. We conclude that a systems approach is needed to align metrics across different elements of OR performance, and that the wellbeing of healthcare professionals is underrepresented in current optimisation approaches.

Evaluating the Impact of Supervision on Surgical Trainees Stress Response During Simulated Surgical Procedures; A Crossover Randomized Trial

OBJECTIVE

The aim of this study was to evaluate the cumulative impact of supervision on technical skills and surrogate stress markers in surgical trainees.

DESIGN

This was a quasi-experimental crossover study to evaluate the impact of attending supervision on orthopedic trainee stress response during a simulated surgical procedure. Enrolled residents performed a proximal femoral nail module with the Precision OS system twice; once independently, and once under direct attending supervision, whilst wearing a heart rate monitor. Mean and maximum heart rates were recorded. Simulated performance was assessed using validated simulator-based metrics. Student's t-test was used to evaluate the impact of supervision on trainee heart rate, and performance ranking.

SETTING

Tertiary trauma center in a Regional Orthopedic Unit PARTICIPANTS: Orthopedic interns and residents within our institution were invited to participate, with 20 participants included for analysis.

RESULTS

Both supervised and unsupervised mean heart rate was significantly higher (p = 0.001) than baseline recorded heart rates. Supervised mean and maximum HR were significantly higher than unsupervised HR during module completion (p = 0.015; p = 0.001). Calories burned demonstrated correlation to surrogate stress markers, significantly higher in supervised sessions (p = 0.004). Performance metrics demonstrated superior performance in senior-level participants, with a decrement in performance during supervision, failing to reach significance.

CONCLUSION

The development of accretion of technical and non-technical skills required in surgical training pathways may derive benefit from the use of simulation-based training in surgical residents with both supervised and unsupervised sessions.

Association Between Operating Room Noise and Team Cognitive Workload in Cardiac Surgery

Excessive intra-operative noise in cardiac surgery has the potential to serve as source of distraction and additional cognitive workload for the surgical team, and may interfere with optimal performance. The separation from bypass phase is a technically complex phase of surgery, making it highly susceptible to communication breakdowns due to high cognitive demands and requiring tightly coupled team coordination. The objective of this study was to investigate team cognitive workload levels and communication in relation to intra-operative time periods representative of infrequent vs. frequent peaks in ambient noise. Compared to 5-minute segments with no peaks in noise at all, segments with the highest percentage of noise peaks (≥10%) were significantly associated with higher team members' heart rate before, during, and after noise segments analyzed. These noisier segments were also associated with a significantly higher level of case-irrelevant communication events. These data suggest that case-irrelevant conversations associated with a greater degree of excessive peaks in noise may be associated with team workload levels, warranting further investigation into efforts to standardize communication during critical surgical phases.

An Assessment of the Impact of Flow Disruptions on Mental Workload and Performance of Surgeons During Percutaneous Nephrolithotomy

Objective

The aim of this study was to assess the impact of intraoperative disruptions on surgeons’ workload and performance during percutaneous nephrolithotomy (PCNL).

Materials and methods

A structured and standardized tool was used to identify disruptions and interferences that occurred during 33 PCNL procedures. The surgical steps during PCNL were divided into four phases: ureteric catheter placement (phase I), puncture and tract dilation (phase II), intra-calyceal navigation and stone fragmentation (phase III), and tube placement (phase IV). Surgeons’ workload was evaluated using a validated tool: Surgery Task Load Index (SURG-TLX), and correlated with the mean observed intraoperative disruptions. All operating team members evaluated the teamwork immediately after the procedure. Statistical analysis was performed using SPSS Statistics version 22 (IBM, Armonk, NY).

Results

A total of 1,897 disturbances were observed, with an average of 57.48 ± 16.36 disruptions per case. The largest number of disruptions occurred during phase III of PCNL (32.06 ± 14.12). The most common cause of the disruption was people entering or exiting the operating room (OR) (29.1 ± 10.03/case), followed by the ringing of phones or pagers (6.42 ± 2.4). The mean observed intraoperative disruptions were significantly associated with the operating surgeon’s mental workload, and it had a significant impact on all domains of surgeons’ mental workload as measured by SURG-TLX. Compared to other team members, surgeons’ assistants experienced an inferior sense of teamwork (r=-0.433; p=0.012).

Conclusion

Significant intraoperative disruptions were observed during PCNL. They were observed to directly correlate with the surgeon's workload and had a detrimental effect on teamwork. Improving OR dynamics by reducing unnecessary disruptions would help establish an efficient and smooth surgical work environment for safe surgical care.