Development of a novel observed structured clinical exam to assess clinical ultrasound proficiency in undergraduate medical education

OBJECTIVES

A pilot study was performed to develop and test an observed structured clinical exam (OSCE) for clinical ultrasound in second-year medical students. The goal was to assess a longitudinal clinical ultrasound curriculum for medical students and to help determine readiness to perform ultrasound during clinical clerkships.

METHODS

The OSCE contained 40 tasks over 30 min in a one-to-one examiner to examinee environment using standardized patients covering cardiac, pulmonary, and inferior vena cava (IVC) ultrasound exams along with 6 critical diagnoses. Examinees were assessed using a binary checklist approach. A two-way ANOVA analysis was performed to determine if there were differences between the day and session the OSCE was administered. Results are presented as mean ± standard deviation.

RESULTS

One hundred fifty-two students were tested with an overall mean score of 64.9 ± 17.6%. Scores between the cardiac, IVC, and lung sections varied-67.8% ± 18.8%, 62.4% ± 26.2%, and 57.1% ± 20.6%, respectively. One hundred twenty-six (82.9%) answered at least one critical diagnosis incorrectly. Students in the late session performed better than the early session (1: 60% vs 2: 69%, p = .001).

CONCLUSIONS

Students performed better in later sessions. Additionally, the number of questions left blank at the end of the exam suggests that the length of the OSCE should be evaluated. Incorporating critical diagnoses was challenging for examinees. The proposed OSCE is a valuable assessment tool that could be adapted to assess student's readiness to use clinical ultrasound prior to clerkships.

Is gallbladder PoCUS diagnostic accuracy accessible to medical students after PoCUS training exclusively on healthy volunteers? A pilot randomized control trial

BACKGROUND

Point-of-care ultrasound (PoCUS) is increasingly used in clinical practice and is now included in many undergraduate curricula. Here, we aimed to determine whether medical students who participated in a PoCUS teaching program with several practical training sessions involving healthy volunteers could achieve a good level of diagnostic accuracy in identifying gallbladder pathologies. The intervention group (IG) was trained exclusively on volunteers with a healthy gallbladder, whereas the control group (CG) had access to volunteers with a pathological gallbladder as recommended in most PoCUS curricula.

MATERIALS AND METHODS

Twenty medical students were randomly assigned to the IG and CG. After completing the training program over 2 months, students were evaluated by three independent examiners. Students and examiners were blind to group allocation and study outcome. Sensitivity and specificity of students' PoCUS gallstone diagnosis were assessed. Secondary outcomes were students' confidence, image quality, acquisition time, and PoCUS skills.

RESULTS

Sensitivity and specificity for gallstone diagnosis were, respectively, 0.85 and 0.97 in the IG and 0.80 and 0.83 in the CG. Areas under the curve (AUC) based on the receiver operating characteristic curve analysis were 0.91 and 0.82 in the IG and CG, respectively, with no significant difference (p = 0.271) and an AUC difference of -0.092. No significant between-group difference was found for the secondary outcomes.

CONCLUSIONS

Our pilot study showed that medical students can develop PoCUS diagnostic accuracy after training on healthy volunteers. If these findings are confirmed in a larger sample, this could favor the delivery of large practical teaching sessions without the need to include patients with pathology, thus facilitating PoCUS training for students.

Are seminal vesicles a potential pitfall during pelvic exploration using point-of-care ultrasound (POCUS)?

Background

Trauma is a major cause of death among the working population. Many countries have now adopted a structured approach to trauma management in which ultrasound is used as a primary evaluation tool. While its use has direct therapeutic benefits, many artifacts and pitfalls are inherent to the technique. Knowledge of the most frequently encountered pitfalls in practice could thus help reduce the risk of error and lead to more accurate trauma assessments.

Objective

This study evaluates a potential pitfall caused by seminal vesicles during focused assessment with sonography for trauma examinations of the male pelvis performed by an emergency physician with experience in point-of-care ultrasound.

Methods

We took five static and five dynamic (3-s loops) transverse ultrasound images of the pelvis in five healthy males. The images and videos were then incorporated into an online survey and emailed through the World Interactive Network Focused On Critical UltraSound (WINFOCUS) in France and the Ultrasound and Emergency Medicine (UEM) Organization in Belgium. A questionnaire asked anonymous participants to assess the presence of free fluid in the static and dynamic images and to share information about their training and experience in point-of-care ultrasound. To validate the static and dynamic images, the survey was sent to three external radiologists for independent verification.

Results

A total of 191 individuals responded fully or partially to the survey, 114 of whom completed it. Among the 114 participants who completed the survey, the misinterpretation rate was 0.55 (95CI 0.51–0.60) for all static and dynamic ultrasound transverse pelvic views. The misinterpretation rate was 0.61 (95CI 0.55–0.66) and 0.50 (95CI 0.45–0.55) for static and dynamic ultrasound transverse pelvic views, respectively. The three external radiologists answered the questionnaire correctly without misinterpreting the survey ultrasound views.

Conclusions

Seminal vesicles are a potential pitfall when interpreting transverse ultrasound images of the male pelvis in the context of point-of-care ultrasound.

Usefulness of point-of-care ultrasound for the evaluation of non-traumatic eye emergencies

The role of clinical ultrasound or Point-of-Care Ultrasound (POCUS) in patients with urgent pathology has expanded exponentially in recent years. With clinical ultrasound, physicians can make a quick assessment and decide how to act in time critical situations. Ocular ultrasound is one of the most recently developed applications. In patients with severe non-traumatic ocular pathology it has numerous clinically relevant uses: retinal detachment, occlusion of the central retinal artery or optic nerve pathologies, among others. The technique is widely available, easy to perform, and can provide information even when fundoscopy is impossible. In this review, we describe the bases of clinical ocular ultrasound, focusing on the management of the main non-traumatic urgent ophthalmological pathologies that the physician may face in their clinical practice.

Inspiratory collapse of the inferior vena cava and the kissing ventricle sign: markers of poor prognosis in emergency gastrointestinal bleeding

OBJECTIVES

Gastrointestinal bleeding, one of the main reasons for emergency department visits, is associated with significant mortality, complications, and high health care spending. Studies have shown the usefulness of hemodynamic monitoring by ultrasound of the inferior vena cava (IVC), imaging of systolic obstruction of the left ventricle (the kissing sign), changes in cardiac output, or surrogates for cardiac output such as the left ventricular velocity time integral before and after a passive leg raise. There is currently no evidence for applying this approach to evaluating hypovolemia due to gastrointestinal bleeding.

MATERIAL AND METHODS

We prospectively recruited 203 emergency department patients with gastrointestinal bleeding between August 2015 and April 2017; this sample size provided a 95% CI for a proportion of 5%, with a precision of 3% and expected losses of 15%. Recorded data were as follows: medical histories, observations during physical examinations, laboratory results, diagnostic variables, treatment details, clinical course, and ultrasound findings related to hemodynamics.

RESULTS

Clinical course was worse in patients with evidence of hypovolemia such as a small (<1 cm) end-expiratory IVC diameter (IVCEE) or the kissing sign. Complications were more prevalent at 24 hours and 30 days, a finding that was not associated with the other clinical or laboratory variables commonly monitored. We also saw that both a small IVCEE and persistent inspiratory collapse of the IVC of more than 50% after a passive leg raise test might prove useful for identifying patients at risk for anemia at 24 hours, allowing time to start preventive measures.

CONCLUSION

The analysis of IVCEE, inspiratory collapse of the IVC, or the kissing sign in combination with clinical and laboratory findings can facilitate the use of clinical practice algorithms that can encourage the efficient risk-based assignment of resources and improve prognosis.

Clinical ultrasound in the management of polytraumatized patients in the daily practice of the anesthesiologist

Ultrasound has an important role in the diagnosis and prognosis of polytrauma patients. We describe a case of a 52-year-old man with hemodynamic instability and multiple injuries. Abdominal ultrasound evaluation was positive for hemoperitoneum, so an exploratory laparotomy was performed. During the intraoperative period, lung ultrasound was used to exclude traumatic lung injury. In the right lung, lung ultrasound suggested the presence of pneumothorax, and in the left a subpleural consolidation. Subsequently, a computed tomography was performed, confirming the sonographic findings. On the fourth admission day, he underwent surgical correction of a left hip fracture. A type 2 quadratus lumborum block (ultrasound-guided) was performed before surgical incision. The procedure was uneventful. The patient remained hemodynamically stable, without indirect signs of pain. This case shows that ultrasound-guided examination plays a crucial role in the management of polytrauma patients. It was a fundamental diagnostic tool in the initial evaluation, and was also used during surgery.

Changes in the availability of bedside ultrasound practice in emergency rooms and prehospital settings in France

OBJECTIVE

Ensuring the availability of ultrasound devices is the initial step in implementing clinical ultrasound (CUS) in emergency services. In France in 2011, 52% of emergency departments (EDs) and only 9% of mobile intensive care stations (MICS) were equipped with ultrasound devices. The main goal of this study was to determine the movement of these rates since 2011.

METHODS

We conducted a cross-sectional, descriptive, multicentre study in the form of a questionnaire. To estimate the numbers of EDs and MICS equipped with at least one ultrasound system with a confidence level of 95% and margin of error of 5%, 170 responding EDs and 145 MICS were required. Each service was solicited three times by secure online questionnaire and then by phone.

RESULTS

Three hundred and twenty-eight (84%) services responded to the questionnaire: 179 (86%) EDs and 149 (82%) MICS. At least one ultrasound machine was available in 127 (71%, 95% CI [64; 78]) EDs vs. 52% in 2011 (P<0.01). 42 (28%, 95% CI [21; 35]) MICS were equipped vs. 9% in 2011 (P<0.01). In 97 (76%) EDs and 24 (55%) MICS, less than a half of physicians were trained. CUS was used at least three times a day in 52 (41%) EDs and in 8 (19%) MICS.

CONCLUSION

Our study demonstrates improved access to ultrasound devices in French EDs and MICS. Almost three-quarters of EDs and nearly one-third of MICS are now equipped with at least one ultrasound device. However, the rate of physicians trained per service remains insufficient.

A Preliminary Study of Estimation of Cobb's Angle From the Spinous Process Angle Using a Clinical Ultrasound Method

BACKGROUND

Over a lifetime of having radiographs, a patient with adolescent idiopathic scoliosis (AIS) can be cumulatively exposed to high doses of ionizing radiation. Therefore, radiation-free, effective, and low-cost methods to screen and diagnose scoliosis have been sought for years.

PURPOSE

This study aims to investigate the correlation between the Cobb's angle and the spinous process angle (SPA) and to study the feasibility of using clinical ultrasound images to estimate the Cobb's angle by measuring the SPA.

STUDY DESIGN

This manuscript includes a retrospective and a prospective study.

METHODS

In the retrospective study, radiographs from 43 subjects with AIS were used to investigate the correlation between the Cobb's angle and the SPA at the pre-brace and in-brace stages. Following this study, a prospective clinical ultrasound study was conducted on 33 subjects with AIS at the pre-brace stage to measure the SPA.

RESULTS

High intra-rater and inter-rater reliabilities of radiograph measurements were found (ICC[3,3] = 0.97, ICC[2,3] = 0.91, p < .05). The clinical ultrasound measurements were also found to be highly reliable (ICC[3,3] = 0.91, p < .05). There was a significant correlation (r = 0.80 at the pre-brace stage and r = 0.87 at the in-brace stage, p < .05) between the Cobb's angle and the SPA measured from the radiograph measurements, whereas the SPA measured from ultrasound images were found highly correlated with that measured from the radiographs at the pre-brace stage (r = 0.90, p < .01).

CONCLUSIONS

The findings of this study could support the new parameter (SPA) in the estimation of the Cobb's angle of a scoliotic curve in the coronal plane, and clinical ultrasound imaging could be developed and applied to assess scoliosis in a fast and noninvasive fashion.

LEVEL OF EVIDENCE

Level III.

[Possibilities of clinical echocardiography in patients with heart failure: some examples from clinical practice]

Clinical echocardiography is a fast, non-invasive and safe diagnostic method carried out at the patient's bedside by clinicians, not necessarily cardiologists, and can provide useful information about cardiac anatomy, with estimates of volumes, diameters, the presence or absence pericardial effusion, and visualization of ventricular wall motion and valve function. The most practical measure of ventricular function to distinguish between patients with systolic dysfunction and those with preserved systolic function is ejection fraction, which can be estimated approximately. The new small pocket echocardiography devices that have become available in recent years offer major advantages in terms of availability and their cost can be considered accessible compared with that of other devices. An undisputed practical advantage is their portability and ease of use. Clinical echocardiography is perfectly compatible with the subsequent performance of echocardiography by a highly qualified expert.