Taro Minami

A Prerotational, Simulation-Based Workshop Improves the Safety of Central Venous Catheter Insertion: Results of a Successful Internal Medicine House Staff Training Program

BACKGROUND The purpose of this study was to evaluate the effectiveness of a simulation-based workshop with ultrasonography instruction in reducing mechanical complications associated with central venous catheter (CVC) insertion. METHODS A single-center prospective cohort study was conducted in the medical ICU and respiratory step-down unit of an urban teaching hospital. Fifty-six medical house staff members were trained prior to their rotations over a 6-month period. The data on mechanical complication rates after the implementation of the workshop were compared with previous experience when no structured educational program existed. RESULTS There were 334 procedures in the preeducation period compared to 402 procedures in the posteducation period. The overall complication rate, including placement failure, in the preeducation and posteducation period was 32.9% and 22.9%, respectively (P < .01). Placement failure rate decreased from 22.8% to 16.2% (P = .02), and arterial punctures decreased from 4.2% to 1.5% (P = .03). Ultrasonography usage increased from 3.0% to 61.4% (P < .01). Multivariate analysis demonstrated that interns were more likely to cause overall mechanical complications compared with fellows and attending physicians in the preeducation period (P = .02); however, this trend was not observed in the posteducation period. Catheter site and ultrasonography usage significantly affected the overall complication rate in both periods, and ultrasound-guided femoral CVC was the safest procedure in the posteducation period. CONCLUSIONS Implementation of a prerotational workshop significantly improved the safety of CVC insertion, especially for CVCs placed by inexperienced operators. We suggest that simulation-based training with ultrasonography instruction should be conducted if house staff members are responsible for CVC placement.

Gender disparity in radial and femoral arterial size: an ultrasound study.

Sir: Arterial catheterization is a common intensive care unit (ICU) procedure. We have previously found that women are more likely to fail catheter attempts [1]. Few prior studies have investigated gender differences in arterial size. Men have larger left main and left anterior descending (LAD) coronary arteries, independently of body surface area (BSA) [2]. Herity et al. [3] found increased LAD size in hearts transplanted from female donors to male recipients. Krejza et al. found men have larger carotid arteries [4]. Babuccu et al. [5] studied the diameters of radial, thoracodorsal, and dorsalis pedis arteries in pediatric patients and found that age, weight, and male gender are associated with larger size. The radial and femoral arteries are commonly used for arterial catheter placement. We studied arterial size in these locations to determine whether men have larger arteries. The study was conducted over a 4-month period beginning 11 May 2005 in the medical ICU of an urban teaching hospital. The study was approved by the Beth Israel Medical Center Institutional Review Board and was performed in accordance with the ethical standards of the 1964 Declaration of Helsinki. The requirement for written informed consent was waived. An Acuson Cypress 7.5 MHz ultrasound probe with 0.1-mm resolution was used (Siemens, Malvern, Pa., USA). Arterial diameter was measured in the transverse orientation of arterial diameter in systole. Measurements were taken during three different cardiac cycles and averaged. Radial arteries were measured 2 cm proximal to the distal wrist crease. Femoral arteries were measured one-third of the way from the pubic symphysis to the superior iliac crest. Based on clinical observations prior to the study we estimated that men’s femoral arteries would be 1 mm larger than women’s, and that their radial arteries would be 0.5 mm larger. Setting α at 5% and β at 20%, we calculated that 30 patients would be required to detect this difference in femoral arteries, and 36 patients would be required for radial arteries. Associations between demographic characteristics and arterial size were assessed by

Gender disparity in failure rate for arterial catheter attempts

We examined risk factors associated with failure of arterial catheterization in the medical intensive care unit of a large urban teaching hospital. We analyzed 92 consecutive arterial catheterizations by internal medicine house staff and critical care fellows. Of the 92 attempts, 26.1% were done on femoral arteries, and 73.9% were done on radial arteries. Failure, which occurred in 28% of attempts, was more common in female patients (P < .001). The failure rate was 50.0% for attempts on femoral arteries and 20.6% on radial arteries. Systolic blood pressure was significantly lower in patients where the attempt failed ( P = .024). In univariate analyses, hemoglobin values were lower (P = .028) and number of percutaneous punctures were higher (P = .019) in patients where catheterization failed. After multivariate analysis, only gender and systolic blood pressure remained statistically significant. The strongest predictor of failure was female gender. A possible explanation not explored here could be smaller arterial size in female patients.

Quality of care associated with number of cases seen and self-reports of clinical competence for Japanese physicians-in-training in internal medicine

BackgroundThe extent of clinical exposure needed to ensure quality care has not been well determined during internal medicine training. We aimed to determine the association between clinical exposure (number of cases seen), self- reports of clinical competence, and type of institution (predictor variables) and quality of care (outcome variable) as measured by clinical vignettes.MethodsCross-sectional study using univariate and multivariate linear analyses in 11 teaching hospitals in Japan. Participants were physicians-in-training in internal medicine departments. Main outcome measure was standardized t-scores (quality of care) derived from responses to five clinical vignettes.ResultsOf the 375 eligible participants, 263 (70.1%) completed the vignettes. Most were in their first (57.8%) and second year (28.5%) of training; on average, the participants were 1.8 years (range = 1–8) after graduation. Two thirds of the participants (68.8%) worked in university-affiliated teaching hospitals. The median number of cases seen was 210 (range = 10–11400). Greater exposure to cases (p = 0.0005), higher self-reports of clinical competence (p = 0.0095), and type of institution (p < 0.0001) were significantly associated with higher quality of care, using a multivariate linear model and adjusting for the remaining factors. Quality of care rapidly increased for the first 100 to 200 cases seen and tapered thereafter.ConclusionThe amount of clinical exposure and levels of self-reports of clinical competence, not years after graduation, were positively associated with quality of care, adjusting for the remaining factors. The learning curve tapered after about 200 cases.

Musical Instrument-Associated Health Issues and Their Management

Playing musical instruments can bring joy to people, but can also cause a wide variety of health issues that range from mild disorders to potentially fatal conditions. Although sports medicine is an established medical subspecialty, relatively few studies have investigated the health issues associated with musical instruments. Here we present an overview of these health issues. These include infections due to microorganisms, allergic reactions, as well as mechanical injuries from sustained high pressures within the oral, mediastinal, thoracic, and abdominal cavities. For example, wind instruments can potentially harbor thousands of pathogenic organisms. If several players share the same instrument, these instruments present potential hazards in the spread of infections. A fatal case of hypersensitivity pneumonitis in a bagpiper is particularly noteworthy. Similarly, a case of gastrointestinal anthrax in an animal-hide drummer is a reminder of this rare but highly fatal disease. Although not fatal, hearing-related disorders, neuromuscular issues, musculoskeletal problems, and contact dermatitis are also very common among instrumentalists. This review aims to illuminate these under-recognized health issues by highlighting both the common conditions and the rare but fatal cases.

Disorders of the Diaphragm

Pathologic processes that involve the central nervous system, phrenic nerve, neuromuscular junction, and skeletal muscle can impair diaphragm function. When these processes are of sufficient severity to cause diaphragm dysfunction, respiratory failure may be a consequence. This article reviews basic diaphragm anatomy and physiology and then discusses diagnostic and therapeutic approaches to disorders that result in unilateral or bilateral diaphragm dysfunction. This discussion provides a context in which disorders of the diaphragm and their implications on respiratory function can be better appreciated.

Assessing Diaphragm Function in Chest Wall and Neuromuscular Diseases

Diaphragm dysfunction is defined as the partial or complete loss of diaphragm muscle contractility. However, because the diaphragm is one of only a few skeletal muscles that is not amenable to direct examination, the tools available for the clinician to assess diaphragm function have been limited. Traditionally, measures of lung volume, inspiratory muscle strength, and radiographic techniques such as fluoroscopy have provided the major method to assess diaphragm function. Measurement of transdiaphragmatic pressure provides the most direct means of evaluating the diaphragm, but this technique is not readily available to clinicians. Diaprhragm ultrasonography is new method that allows for direct examination of the diaphragm.

Acute COPD exacerbation presenting with pronounced intrabullous haemorrhage and haemoptysis

A 54-year-old man with history of chronic obstructive pulmonary disease (COPD) presented with subacute onset of chest pain, shortness of breath, productive cough with haemoptysis and night sweats. There were no fever or recent weight loss reported. The chest radiograph showed right upper lobe bullae with adjacent opacification and an emphysematous lung. Due to worsening haemoptysis and persistent chest pain, CT of the chest with contrast was performed, which revealed moderate to severe emphysema and numerous blood-filled bullae. Cardiac work-up for chest pain was negative for myocardial ischaemia and for aortic dissection. Further infectious work-ups for mycobacterial and invasive fungal infection were negative. The patient was treated for acute COPD exacerbation and responded well to the antibiotics with the resolution of haemoptysis. Follow-up CT of the chest revealed the gradual resolution of the haemorrhage, while the patient remained asymptomatic.

Skills acquisition for novice learners after a point-of-care ultrasound course: does clinical rank matter?

BackgroundFew studies have compared the effectiveness of brief training courses on point-of-care ultrasound (POCUS) skill acquisition of novice attending physicians vs. trainees. The purpose of this study was to evaluate the change in POCUS image interpretation skills and confidence of novice attending physicians vs. trainees after a 1-day POCUS training course.MethodsA 1-day POCUS training course was held in March 2017 in Japan. A standardized training curriculum was developed that included online education, live lectures, and hands-on training. The pre-course assessment tools included a written examination to evaluate baseline knowledge and image interpretation skills, and a physician survey to assess confidence in performing specific ultrasound applications. The same assessment tools were administered post-course, along with a course evaluation. All learners were novices and were categorized as trainees or attending physicians. Data were analyzed using two-way analysis of variance.ResultsIn total, 60 learners attended the course, and 51 learners (85%) completed all tests and surveys. The 51 novice learners included 29 trainees (4 medical students, 9 PGY 1–2 residents, 16 PGY 3–5 residents) and 22 attending physicians (6 PGY 6–10 physicians, and 16 physicians PGY 11 and higher). The mean pre- and post-course test scores of novice trainees improved from 65.5 to 83.9% while novice attending physicians improved from 66.7 to 81.5% (p < 0.001). The post-course physician confidence scores in using ultrasound significantly increased in all skill categories for both groups. Both trainees and attending physicians demonstrated similar improvement in their post-course test scores and confidence with no statistically significant differences between the groups. The course evaluation scores for overall satisfaction and satisfaction with faculty members’ teaching skills were 4.5 and 4.6 on a 5-point scale, respectively.ConclusionsBoth novice trainees and attending physicians showed similar improvement in point-of-care ultrasound image interpretation skills and confidence after a brief training course. Although separate training courses have traditionally been developed for attending physicians and trainees, novice learners of point-of-care ultrasound may acquire skills at similar rates, regardless of their ranking as an attending physician or trainee. Future studies are needed to compare the effectiveness of short training courses on image acquisition skills and determine the ideal course design.

Abdominal Ultrasound and Genitourinary Ultrasound in the Intensive Care Unit

Ultrasound imaging of the abdomen can be a valuable tool in the bedside assessment of the critically ill patient. A systematic and reproducible approach to critical care ultrasound assessment of the abdomen is outlined in this chapter, using a four-point, location-specific approach adapted from the Focused Assessment with Sonography for Trauma (FAST) exam. This system allows for the rapid assessment of multiple organs and pathologies pertinent to the critically ill patient, including assessment of the urinary tract, diagnosis of free fluid, and imaging of important vascular structures. Limitations of this approach and common pitfalls in imaging acquisition and interpretation are discussed. Adoption of this location-specific approach will provide the novice critical care ultrasonographer with a structure for approaching abdominal ultrasound in the intensive care unit.