Operative Exposure Research Articles

AHPBA senior leaders’ assessments of strengths, weaknesses, opportunities, and threats facing fellowship training in HPB surgery: “We need to standardize our training experiences”

BackgroundMultiple fellowship programs in North America prepare surgeons for a career in Hepato-Pancreatico-Biliary (HPB) surgery. Inconsistent operative experiences and disease process exposures across programs and pathways produces variability in training product and therefore, lack of clarity around what trained HPB surgeons are prepared to do in early practice. Thus, a strengths, weaknesses, opportunities, and threats (SWOT) analysis of AHPBA fellowship training was conducted. MethodsThis was a mixed-methods, cross-sectional study. Eleven AHPBA-Founding Members (FM) and 24 current or former Program Directors (PD) of programs eligible for AHPBA certificates were surveyed and interviewed. Grounded theory principles and thematic network analysis were used to analyze interview transcripts. Descriptive statistics were used to analyze survey data. ResultsThree main themes were identified: (i) Concern for training rigor and consistency (ii) Desire to standardize curricula and broaden training requirements and, (iii) Need to validate both the value of training and job marketability via certification. DiscussionBased on the themes identified, the strengths of AHPBA-certified HPB programs include superior technical training and case volumes. Areas of improvement included elevating baseline competencies by increasing required case volume and breadth to ensure minimally invasive experience, operative autonomy, and multidisciplinary care coordination.

Prospective measurements of hearing threshold during military rifle training with in-ear, protected, noise exposure monitoring.

Although a causal relationship exists between military occupational noise exposure and hearing loss, researchers have struggled to identify and/or characterize specific operational noise exposures that produce measurable changes in hearing function shortly following an exposure. Growing evidence suggests that current standards for noise-exposure limits are not good predictors of true hearing damage. In this study, the aim was to capture the dose-response relationship during military rifle training exercises for noise exposure and hearing threshold. To capture exposure, a wearable system capable of measuring impulse noise simultaneously on-body and in-ear, behind hearing protection was used. To characterize hearing threshold changes, portable audiometry was employed within 2 h before and after exposure. The median 8-h time-weighted, protected, free-field equivalent in-ear exposure was 87.5 dBA at one site and 80.7 dBA at a second site. A significant dose-response correlation between in-ear noise exposure and postexposure hearing threshold changes across our population ( R = 0.40 , p = 0.0281) was observed. The results demonstrate an approach for establishing damage risk criteria (DRC) for in-ear, protected measurements based on hearing threshold changes. While an in-ear DRC does not currently exist, it may be critical for predicting the risk of injury for noise environments where protection is mandatory and fit status can vary.

Cloud-based fusion imaging improves operative metrics during fenestrated endovascular aneurysm repair

ObjectiveEndovascular treatment of complex aortic pathology has been associated with increases in procedural-related metrics, including the operative time and radiation exposure. Three-dimensional fusion imaging technology has decreased the radiation dose and iodinated contrast use during endovascular aneurysm repair. The aim of the present study was to report our institutional experience with the use of a cloud-based fusion imaging platform during fenestrated endovascular aneurysm repair (FEVAR). MethodsA retrospective review of a prospectively maintained aortic database was performed to identify all patients who had undergone FEVAR with commercially available devices (Zenith Fenestrated; Cook Medical Inc, Bloomington, IN) between 2013 and 2020 and all endovascular aneurysm repairs performed using Cydar EV Intelligent Maps (Cydar Medical, Cambridge, UK). The Cydar EV cohort was reviewed further to select all FEVARs performed with overlay map guidance. The patient demographic, clinical, and procedure metrics were analyzed, with a comparative analysis of FEVAR performed without and with the Cydar EV imaging platform. Patients were excluded from comparative analysis if the data were incomplete in the dataset or they had a documented history of prior open or endovascular abdominal aortic aneurysm repair. ResultsDuring the 7-year study period, 191 FEVARs had been performed. The Cydar EV imaging platform was implemented in 2018 and used in 124 complex endovascular aneurysm repairs, including 69 consecutive FEVARs. A complete dataset was available for 137 FEVARs. With exclusion to select for de novo FEVAR, a comparative analysis was performed of 53 FEVAR without and 63 with Cydar EV imaging guidance. The cohorts were similar in patient demographics, medical comorbidities, and aortic aneurysm characteristics. No significant difference was noted between the two groups for major adverse postoperative events, length of stay, or length of intensive care unit stay. The use of Cydar EV resulted in nonsignificant decreases in the mean fluoroscopy time (69.3 ± 28 minutes vs 66.2 ± 33 minutes; P = .598) and operative time (204.4 ± 64 minutes vs 186 ± 105 minutes; P = .278). A statistically significant decrease was found in the iodinated contrast volume (105 ± 44 mL vs 83 ± 32 mL; P = .005), patient radiation exposure using the dose area product (1,049,841 mGy/cm2 vs 630,990 mGy/cm2; P < .001) and cumulative air kerma levels (4518 mGy vs 3084 mGy; P = .02) for patients undergoing FEVAR with Cydar EV guidance. ConclusionsAt our aortic center, we have observed a trend toward shorter operative times and significant reductions in both iodinated contrast use and radiation exposure during FEVAR using the Cydar EV intelligent maps. Intelligent map guidance improved the efficiency of complex endovascular aneurysm repair, providing a safer intervention for both patient and practitioner.

Augmented Intelligence Maps Can Improve Intraoperative Outcomes

Endovascular treatment of complex aortic aneurysms has traditionally required increased operative time, radiation exposure, fluoroscopy time, and contrast compared with treatment of simple aortic aneurysms. However, previous literature has shown that this minimally invasive approach improves patient morbidity and mortality compared with open repair. Surgical overlay software using augmented intelligence (AI) is a fast-developing area that was initiated at our institution in June 2019. In the present study, we have sought to show that the use of this software can aff5ct patient safety.

Health Risk Assessment for Pest Control Workers Using Biocidal Products after COVID-19 Outbreak: A Comparison of EU and US

After the COVID-19 outbreak, the workloads of disinfection have remarkably increased. As disinfectants are harmful to human, health risk assessment of disinfection workers is needed to ensure their safety. However, the acceptable operator exposure level (AOEL) for most disinfectants are not established. Moreover, the method of calculating the AOEL varies across the countries. This study aims to identify the health risks of disinfection workers based on two different risk assessment methods of EU and US after the COVID-19 outbreak. We surveyed 533 disinfection workers to identify exposure patterns of disinfectants. The inhalation and dermal exposure were calculated based on different work types. The AOEL was calculated and compared using the EU and US methods. The health risks of workers are determined by hazard index based on whether the exposure exceeds AOEL. Workers used 53 chemicals from 175 biocidal products, and only 34 chemicals (65%) had AOEL. 17 Chemicals with absorption factors for each route or AOEL were selected for risk assessment. When compared the estimated AOEL was calusing EU and US methods, only 2 (4%) were the same. The result of health risk assessment showed 10 (19%) were exceed 1 (acceptable level) using EU method, while 9 (17%) were exceed 1 using US method. This study performed the health risk assessment of disinfection workers based on EU and US methods after the COVID-19 outbreak. Only 65% had an AOEL, and health risks of workers were differd according to risk calculation methods of EU and US. Given the increasing use of biocides after the COVID-19 outbreak, AOEL need to be established for health risk assessment of workers. Biocides, Risk assessment, Reference dose, AOEL, COVID-19, pest control worker This study was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2021R1F1A1063967).

How to do a penile urethroplasty using a novel self-retaining penile retractor.

Effective retraction and clear exposure of urethral tissue is essential in reconstructive penile surgery. The Joshi-Kulkarni retractor provides stable, bloodless operative exposure via non-traumatic tissue compression at the base of penis. The self-retaining design of this retractor also improves ergonomics thereby reducing surgeon fatigue. In this article, we describe how to do a penile urethroplasty by using the Joshi-Kulkarni penile retractor.

Cumulative Blast Exposure Estimate Model for Special Operations Forces Combat Soldiers.

Special Operations Forces (SOF) Service members endure frequent exposures to blast and overpressure mechanisms given their high training tempo. The link between cumulative subconcussive blasts on short- and long-term neurological impairment is largely understudied. Neurodegenerative diseases such as brain dysfunction, cognitive decline, mild cognitive impairment, and dementia may develop with chronic exposures. This hypothesis remains unproven because of lack of ecologically valid occupational blast exposure surveillance among SOF Service members. The purpose of the study was to measure occupational blast exposures in a close quarter battle (CQB) training environment and to use those outcomes to develop a pragmatic cumulative blast exposure (CBE) estimate model. Four blast silhouettes equipped with a field-deployable wireless blast gauge system were positioned in breaching positions during CQB training scenarios. Silhouettes were exposed to flashbangs and three interior breaching charges (single strand roll-up interior charge, 300 grain (gr) explosive cutting tape (ECT), and Jelly charge). Mean blast measures were calculated for each silhouette for flashbangs (n = 93), single strand roll-up interior charge (n = 80), 300 gr ECT (n = 28), and Jelly charge (n = 71). Mean peak blast pressures per detonation are reported as follows: (1) flashbangs (1.97 pounds per square inch [psi]); (2) single strand roll-up interior charge (3.88 psi); (3) 300 gr ECT (2.78 psi); and (4) Jelly charge (1.89 psi). Pragmatic CBE estimates for SOF Service members suggest 36.8 psi, 184 psi, and 2760 psi may represent daily, weekly, and training cycle cumulative pressure exposures. Estimating blast exposures during routine CQB training can be determined from empirical measures taken in CQB environments. Factoring in daily, weekly, training cycle, or even career length may reasonably estimate cumulative occupational training blast exposures for SOF Service members. Future work may permit more granular exposure estimates based on operational blast exposures and those experienced by other military occupational specialties.

Cinefluoroscopy for assessment of mechanical heart valves with suspected dysfunction.

BackgroundMechanical heart valves (MHVs) are preferred prosthesis types in many, especially younger patients who need surgical valve replacement. Although echocardiography is most frequently performed for prosthesis assessment during follow-up, ultrasound artifacts usually preclude a precise investigation of prosthesis function. Cinefluoroscopy (CF) is a simple and effective method to analyze and quantify opening and closing of prosthesis leaflets but requires careful visualization of the valve using optimal viewing angles. Here, we investigated the quality of CF studies in clinical routine and their suitability for quantitative analysis of prosthesis function.Methods and resultsWe retrospectively identified 94 patients with 118 cinefluoroscopies performed by 31 different investigators in one tertiary center from 2012 to 2021. Of 150 MHVs (98% bi-leaflet prostheses), 87 (58%) were aortic, 53 (34%) mitral, 7 (5%) tricuspid, and 5 (3%) pulmonary valve prostheses, respectively. CF studies were categorized by their suitability to quantitatively assess opening and closing angles. Visualization of valve function was “sufficient” in 23%, “suboptimal” in 46%, and “unsuitable” in 31% of the cases.ConclusionIn clinical routine, only one-fourth of CF studies allow for a complete assessment of leaflet motion of MHVs. Although this may be in part due to the varying experience of operators, the high number of unsuitable studies suggests that optimal viewing angles may not be achievable in all patients. Further research is required to investigate standard viewing angles and anatomy after MHV implantation to improve the quality of CF studies and reduce radiation exposure of patients and operators.

OPERATIONAL RISKS AND FINANCIAL PERFORMANCE – THE CONTEXT OF THE JORDANIAN BANKING ENVIRONMENT

The 2008 financial crisis and the eruption of the COVID-19 pandemic have forced banks in Jordan to change their operation pattern. Thus, the main purpose of this study is to examine the impact of operations risk measured by the capital that commercial banks must hold to cover operational risk exposure on listed Jordanian commercial banks performance, represented in two dependent variables: earning per share (EPS) and stock market value (MV). The study used a panel data methodology constructed from the financial statements of all 13 commercial banks listed at Amman Stock Exchange (ASE) for the period 2006-2019. Based on regression analysis, the results explored a significant positive impact on EPS and MV as a proxy of the financial performance. Also, the results, indicated that operational risks, have more explanation power on EPS than on MV. These results contributed to the current literature by providing a roper understanding of the impact of operational risk on financial performance in emerging markets, which could draw some recommendations to banks’ management toward improving the analysis of operational risk.

Transforaminal Versus Interlaminar Endoscopic Lumbar Discectomy for Lumbar Disc Herniation: A Systematic Review and Meta-Analysis.

Meta-analysis and systematic review. This study aims to investigate and compare patient-reported outcomes, perioperative data, and complications between 2 common endoscopic approaches for lumbar disc herniation: transforaminal and interlaminar endoscopic lumbar discectomy, by published high-quality evidence. Electronic databases were searched for reported outcomes following TELD and IELD. Oswestry Disability Index (ODI), visual analog scale of back (VASB) and leg pain (VASL), and MacNab criteria were evaluated. Operative time, hospital stays, blood loss, radiation exposure, and complications were investigated. Odds ratio (OR) and mean differences (MD) with 95% confidence intervals (CI) were calculated using random and fixed-effect models. Total of 1948 patients from 18 studies were included, consisting of 1006 patients (51.6%) in TELD group and 942 (48.4%) patients in IELD group. TELD had better improvement of postoperative ODI (MD = 1.26; 95% CI: .07-2.16; P = .04), postoperative VASB (MD = -.23; 95% CI: -.40 to -.05; P = .01) and last follow-up VASB (MD = -.25; 95% CI: -.41 to -.09; P = .002), but with longer operative time (MD = 10.1min; 95% CI: 1.925-18.77; P < .00001) and more fluoroscopic time (SMD = 4.12; 95% CI: 3.22-5.03; P < .00001), especially in L5-S1 operation. Bed rest time was significantly longer following IELD, with no difference in VASL, hospital stays, or complication. We found comparable clinical outcomes in terms of ODI, VAS, patient satisfaction, hospital stays, and complication between both techniques. TELD required more radiation exposure and longer operative time at L5-S1 level than IELD. Our study provided results to help consider appropriate approaches for selected patients and informed consent of benefits from each approach.

Plastic Surgery Training During Coronavirus Disease 2019 Pandemic: A Quantitative Study on Trainees' Wellness and Education.

Coronavirus disease 2019 (COVID-19) pandemic has had far reaching impacts on all aspects of the healthcare system, including plastic surgery training. Due to reduction in the number of elective surgery cases and need for social distancing, plastic surgery education has shifted from the operating room to the virtual learning environment. Although these changes have been qualitatively described, the authors present a quantitative analysis of plastic surgery training changes due to the COVID-19 pandemic. Our study has identified residents' greatest impediments and inquired about suggestions for further improvements. Our goal is to help residency programs through the COVID-19 pandemic era and contribute to future guidelines when residency education encounters additional unexpected changes. An institutional review board approved anonymous survey using Qualtrics was forwarded on April 23, 2020 to US plastic surgery program directors to be distributed to plastic surgery residents and fellows. Questions centered on the impact of COVID-19 on residents' well-being, education and career plans results were collected for data analysis. Residents were given the option to be in a raffle to win a $50 amazon gift card. Completion of the survey was both anonymous and voluntary. A total of 69 trainees responded (52 integrated residents and 17 independent fellows) from 18 states. Fifty-one percent were male and 49% were female. Fifty-six percent of trainees plan to complete a fellowship program after graduation, 31% will join private practice. Nine percent of trainees reported changes in their postgraduation plans due to the pandemic, 67% were senior trainees. Of those whose goals were affected by COVID-19 pandemic, 56% opted to pursue additional fellowship training. They described reduced operative exposure and cancelations of elective surgeries (50%), the limited availability of private practice jobs (37.5%), and financial reasons (12.5%) for their decision. Twelve percent reported being concerned about not meeting the necessary requirements to finish their residency and graduate on time. Seventy-six percent of trainees expressed concerns about the health and safety of themselves, family and loved ones. Forty-nine percent of trainees reported increased levels of stress since the onset of the pandemic. Ninety-seven percent of trainees reported having reduction in their operative time during the COVID-19 pandemic. They utilized their nonoperative time for online education modules (84%), educational readings (82%), and research (80%). Plastic surgery trainees learned about national webinars through emails from professional society (83%), co-resident/fellow (77%), program director emails (74%), and social media (22%). Webinars attended were mostly through virtual platform modalities, among which Zoom and Webex were the most preferred. Less interactions with colleagues and faculty was the biggest barrier to adopting virtual conferences. Despite this, 72% agreed that having grand rounds, didactics and journal clubs online increased attendance. Additionally, 88% of respondents expressed interests in attending professional society sponsored virtual grand rounds in the future. Results from our survey demonstrated that the overwhelming majority of plastic surgery residents have had reductions in operative times and widespread curriculum changes during the COVID-19 pandemic. These recent changes have increased residents' stress levels and adversity affected their future career plans. Additionally, COVID-19 has heralded an increase in virtual conferences and learning modules. Plastic surgery trainees expressed a preference for virtual educational platforms and interest in continuing virtual didactics in the future. This may irreversibly change the landscape of future plastic surgery training.

Impact of Simulation-Based Training on Radiation Exposure of Young Interventional Cardiologists

Reducing radiation exposure during cardiovascular catheterization is of paramount importance to ensure patient and staff safety. Our study aimed to assess the transferability of acquired skills from virtual reality to the real world, including radioprotection measures during mentored simulation training (ST) in coronary angiography. A total of 10 cardiology residents were evaluated during real-life cases in the catheterization laboratory before (group A) and after mentored ST. The educational effect of mentored simulator training on real-life case performance was evaluated at 2 different time points: within the first week (group B) and after 12 weeks (group C). Compared with group A, the total dose area product (DAP) (µGy•m2) and total air kerma (mGy) were lower after ST: group A: 2,633 (1,723 to 3,617) versus group B: 1,618 (1,032 to 2,562), p <0.05 and 214 (136 to 297) versus 135 (84 to 222), p <0.05, respectively. Concerning operator radiation exposure (µSv), left finger dose: 1,090 (820 to 1,460) versus 635 (300 to 900), p=0.028; left leg dose 80 (0 to 110) versus 0 (0 to 0), p=0.027; left eye lens dose: 39 (24 to 69) versus 11 (8 to 20), p <0.0001; and chest dose outside the lead apron: 50 (34 to 88) versus 29 (21 to 50), p <0.003 were significantly lower in the group B than group A. A total of 12 weeks after ST, the total DAP and total air kerma remained stable along with operator exposure except left eye lens dose (µSv): group B: 11 (8 to 20) versus group C: 16 (12 to 27), p=0.02. In addition, left eye lens dose, left wrist dose, and chest dose outside the lead apron were significantly correlated with total DAP (rs=0.635, rs=0.729, and rs=0, 629, respectively) and total air kerma (rs=0.488, rs=0.514, and rs=0.548, respectively) at 12 weeks. In conclusion, ST for coronary angiography may improve radioprotection learning and should be incorporated into training curricula.

Potential exposure to flubendiamide and risk assessment in Kimchi cabbage field, Gangneung, Gangwon-do, Republic of Korea: the protective role of PPE (personal protective equipment)

In the present study, dermal and inhalation exposure of agricultural workers to insecticide, flubendiamide were determined during pesticide mixing/loading, and hand-held sprayer application in Kimchi cabbage fields, and the potential health risk was assessed. Dermal exposure amount during mixing/loading was 0.8 mg, whereas there was no inhalation exposure (0.0 µg) during similar procedures. Among several different body parts, the hands were the most prominent exposure area (84.5%), followed by the chest and stomach (10.1%). The protective role of PPE (personal protective equipment) during application was determined by comparative experiments with- and without-PPE. The dermal and inhalation exposure with PPE was 3.7 mg and 12.0 µg, respectively. The Forearms (29.6%) and pelvis (18.7%) showed the highest pesticide exposure, followed by the chest and stomach (18.4%). However, the exposure amount of without-PPE was 47.7 mg, and 22.9 µg, respectively, where shins were the most prominent exposure area (83.0%). For the risk assessment of the mixing/loading and application, the AOEL (acceptable operator exposure level) of flubendiamide was used as the reference dose to calculate that the RI (risk index) was much lower than 1 (mixing/loading:0.0, application with PPE:0.2), indicating that agricultural workers are at low risk of exposure to flubendiamide. On the other hand, in the case of an application without PPE, RI is higher than 1 (9.8), suggesting that it can be at risk.

EP-524 Implementing Simulation Based Learning (SBL) to Reduce the Gap in Surgical Training, A Theoretical Evaluation Approach

BackgroundThe current surgical training is severely affected by COVID-19 pandemic with redeployment and reduced number of elective procedure across NHS hospitals, this has affected both core and higher surgical trainees, rendering the traditional apprenticeship model obsolete. It became evident that the future of Surgical training and innovation will require a combination of simulation and operative exposure to overcome the obstacle of reduced exposure in surgical education and operative training.DiscussionIn our theoretical analysis, we will discuss the efficacy, safety and impact of relying on SBL to fill the gaps in surgical training.Clinical exposure alone will not be sufficient to train procedure based speciality trainees to their highest proficiency. SBL is one design that is supported by learning theories such as Transformational Learning and Experiential Learning Theory.In a high fidelity simulation, such as laparoscopic simulation courses, all concepts of facilitated learning are fulfilled which strongly supports our hypothesis.On balance, given the complexity of skills learnt, it remains difficult to measure the efficacy of transferring the learnt capabilities into practice and standardise this among learners. SBL also leaves non-technical skills un-assessed in depth.ConclusionThe disruption of training due to COVID-19 affected our procedure based learning, this leaves us with a dilemma to catch-up with these unmet training needs. SBL could be one of the adjuncts that fill in the gaps on the short and medium term. Implementing SBL in surgical training curriculum, should be evaluated for efficacy and cost effectiveness.

Preoperative Imaging of Intraneural Ganglion Cysts: A Critical Systematic Analysis of the World Literature

Advancements in imaging and an understanding of the pathomechanism for intraneural ganglion cyst formation have led to increased awareness and recognition of this lesion. However, the precise role of imaging has been advocated for but not formally evaluated. We performed a systematic review of the world literature to study the frequency of imaging used to diagnose intraneural ganglion cysts at different sites and compared trends in identifying joint connections. We identified 941 cases of intraneural ganglion cysts, of which 673 had published imaging. Magnetic resonance imaging (MRI, n= 527) and ultrasonography (US, n= 123) were the most commonly reported. They occurred most frequently in the common peroneal nerve (n= 570), followed by the ulnar nerve at the elbow (n= 88), and the tibial nerve at the ankle (n= 58). A joint connection was identified in 375 cases (48%), with 62% of MRIs showing a joint connection, followed by 16% on US, and 6% on computed tomography (CT). MRI was statistically more likely to identify a joint connection than was US (P < 0.01). In the last decade, joint connections have been identified with increasing frequency using preoperative imaging, with up to 75% of cases reporting joint connections. Preoperative imaging plays an important role in establishing the diagnosis of intraneural ganglion cyst as well as treatment planning. Imaging has proved superior to the sole reliance of operative exposure to identify a joint connection, which is necessary to treat the underlying disease. Failure to identify cyst connections on imaging can result in an inability to truly address the underlying pathoanatomy at the time of definitive surgery, leading to a risk for clinical recurrence. Therefore, management should be guided by an intersection between new knowledge presented in the literature, clinical expertise, and surgeon experience.

Treatment of Elderly Femoral Intertrochanteric Fracture by InterTan Intramedullary Nail and PFNA.

To analyze the treatment of elderly femoral intertrochanteric fracture (EFIF) using InterTan intramedullary nail (InterTanIN) and proximal femoral nail antirotation (PFNA). A total of 75 patients suffering from EFIF receiving intramedullary fixation were retrospectively collected. According to intramedullary fixation methods, the patients were separated into InterTanIN group and PFNA group. Parameters including the surgery time, blood loss, number of X-ray fluoroscopy, hospital stays, bone-healing time, postoperative Harris hip score (HIS) (1 month, 3 months, 6 months, and 12 months), and complications were collected and analyzed. The results showed surgery time, blood loss, and number of X-ray fluoroscopy in InterTanIN group were higher than those in PFNA group (P < 0.05). The mean hospital stay in the InterTanIN group was comparable to that in the PFNA group (P > 0.05). There was no significant difference in bone-healing time between the InterTanIN group and PFNA group (P > 0.05). The postoperative HIS of InterTanIN group was statistically better than PFNA group at the 3rd month and the 6th month (P < 0.05). With the extension of recovery time, the gap between the two groups gradually narrowed. The postoperative implant displacement happened more often in the PFNA group than in the InterTanIN group. EFIF treated with InterTanIN or PFNA could achieve good long-term efficacy. Although InterTanIN has the disadvantages of increased operative time, blood loss, and radiation exposure compared to PFNA, the postoperative hip function recovery of InterTanIN seems to be more reliable and stable than PFNA.

EnSite NavX mapping system guided implantation of a dual-chamber permanent pacemaker in a 41-year-old pregnant woman with a 4-year follow-up

BackgroundX-ray fluoroscopy has been the primary cardiac imaging modality in permanent pacemaker implantation (PPI) operations, but it inevitably results in radiation exposure for both operators and patients. Fluoroscopy is considered a contraindication, especially in certain circumstances, such as gestation, during which the fetus is most sensitive to radiation exposure. Therefore, measures to avoid radiation exposure are necessary, and a more safe and feasible approach is needed for this procedure. Since the EnSite NavX mapping system (ENMS) can create the required geometric contours of those relevant cardiac structures and chambers, it can be used as an alternative to X-ray fluoroscopy in PPI. In addition, because the displacement of atrial leads is a common complication of PPI, lead displacement may occur more readily without fluoroscopic guidance. Therefore, reliable measures are required to prevent leads from displacement.Case introductionA 41-year-old woman at the 15th week of gestation was referred to our department with recurrent episodes of syncope and amaurosis fugax for 2 years. Holter monitoring showed sinus rhythm, Mobitz Type II atrioventricular block and high-grade atrioventricular block with ventricular arrest up to 4945 ms. A dual-chamber PPI was performed successfully for the patient under the guidance of the ENMS instead of fluoroscopy. Displacement of atrial lead was effectively avoided by bending the top of atrial lead before implantation and making it a U-shape during operation, which left space for possible subsequent external pulling stress.ConclusionsFor PPI, ENMS is a feasible and reliable alternative to traditional X-ray fluoroscopy, especially when performing operations on pregnant patients. By bending the top of the active-fixation atrial lead into a U-shape during operation, the displacement of atrial lead may be avoided.

Development of the Blast Ordnance and Occupational Exposure Measure for Self-Reported Lifetime Blast Exposures.

To address the military gap in the standardized collection of lifetime blast exposures across clinical and research endeavors, researchers at the National Intrepid Center of Excellence (NICoE) completed a quality improvement project that utilized systematic, iterative focus groups that leveraged the input from various stakeholders including subject matter experts, clinical providers, and service members (SMs) to develop a comprehensive, self-report blast exposure inventory that could be completed within 5-10 minutes. This manuscript outlines the process of the development of this inventory. This project included three phases of focus groups that occurred at the NICoE between August 2020 and March 2021 to collect feedback and input from relevant military stakeholders. The study team utilized related assessments available in the literature, together with clinical experience with the NICoE patient population, to inform the development of an initial draft inventory. Phase 1 consisted of blast injury research subject matter experts who had extensive experience researching and providing clinical care to SMs exposed to blast. Phase 2 consisted of NICoE clinicians across numerous clinical specialties. Phase 3 included current active duty patients in the NICoE intensive outpatient program. Following completion of the focus groups, a lifetime blast exposure inventory was developed in the form of a single page table including incoming, outgoing, training, and operational exposures and broken down by levels of weapon systems as well as breaching and explosive ordnance disposal exposures. In addition, select questions related to the first and most recent blast exposures and experience as an instructor for explosive ordnance disposal- and breaching-related training were included. Researchers at the NICoE developed a self-report blast exposure inventory through a quality improvement project that included active, ongoing participation and feedback of clinical experts and military SMs. The end result is a brief, single page inventory that can be administered within 5-10 minutes. Although additional research is needed to refine and validate the inventory, the project team believes that the tool begins to address a long-standing gap in the DoD in the standardized collection of lifetime blast exposures.

Posterior wall fractures of the acetabulum: treatment using an anatomical plate through direct posterior approach.

This study was aimed to measure the application of W-shaped acetabular angular plate (WAAP) through direct posterior approach (DPA) on the reconstruction of acetabular posterior wall fractures when compared with reconstruction plates. A retrospective study was performed on patients treated with the WAAP or reconstruction plates via the DPA. The intraoperative data of operative time, blood loss and radiation exposure times were recorded. Radiographs of the pelvis and CT scan were obtained within one week post-operation to assess the reduction quality. The clinical outcome was evaluated by the modified Merle d'Aubigne and Postel score. From May 2016 to October 2019, a total of 41 patients with simple acetabular posterior wall fractures were included in this study, 22 from the WAAP group and 19 from the reconstruction plates group. There were no significant differences between the two group in age, gender, time from injury to operation, cause of injuries, length of incision and follow-up time (P > 0.05). In comparison with the reconstruction plates group, the average operation time of the WAAP group was significantly shorter (46.1 ± 12.7min vs 59.2 ± 17.4min, P < 0.05), the average radiation exposure times were significantly less (2.3 ± 0.6 vs 3.6 ± 1.0, P < 0.001), the average blood loss was significantly less (240 ± 98.9ml vs 301.1 ± 66.6ml, P < 0.05). According to Matta radiology criteria and the modified Merle d' Aubigne and Postel score, no significant difference was observed between the two group, as for the quality of reduction and function outcomes. The application of WAAP through DPA showed satisfactory preliminary clinical outcomes, showing promise to be an alternative technique for the treatment of acetabular posterior wall fractures.

Positron Emission Tomography and Computed Tomography Contributions to Patient Dose and Personnel Exposure to Radiation during PET/CT-Guided Tumor Ablations

This study sought to quantify the positron emission tomography (PET) and computed tomography (CT) components of patient radiation doses and personnel exposure to radiations during PET/CT-guided tumor ablations and assess the utility of a rolling lead shield for operator protection. Two operators performed 21 PET/CT-guided ablations behind a customized, 25-mm-thick lead shield with midchest-to-midthigh coverage. The mean patient radiation dose per procedure was 3.90 mSv ± 1.13 (11.3%) from PET and 30.51 mSv ± 19.05 (88.7%) from CT. The mean primary and secondary operator exposure outside neck-level thyroid shields was 0.05 and 0.02 mSv per procedure, respectively. The radiation exposure levels behind the rolling lead shield, inside the primary operator’s thyroid shield, and on the other personnel were below the measurable threshold cumulatively over 21 procedures. The mean PET exposure level at continuous close proximity to patients was 0.02 mSv per procedure. The PET radiation doses to the patients and personnel were small. Thus, the rolling lead shield provided limited benefit.