William B. Burton

Using the case-discussion method to teach epidemiology and biostatistics.

Medical students must learn the principles of epidemiology and biostatistics to critically evaluate the medical literature. However, this subject has traditionally been difficult to teach. In 1997 at the Albert Einstein College of Medicine, the required first-year course in epidemiology and biostatistics was revised to use the case-discussion teaching method. In preparation for the course, experienced faculty participated in an intensive, two-day training workshop. The course, taught to 163 first-year medical students, was structured in two parts: (1) three lectures complemented by a detailed syllabus, followed by a multiple-choice midterm exam; and (2) six case-discussion seminars, followed by a short answer/essay final exam. There were seven case-discussion groups with 23–24 students each. The program was evaluated using subjective faculty feedback, examination scores, and student evaluation questionnaires. Faculty noted excellent student preparation and participation. Multiple-choice exam scores were comparable to those from earlier years, and a short answer/essay exam demonstrated good student mastery of the required material. Student evaluation was overwhelmingly positive, and significantly improved from prior years of the course. Positive student evaluations of the course using this teaching method continued over the next four years; National Board of Medical Examiners examination scores indicated success in mastery of the material; and student assessment of the course improved on the AAMC Graduation Questionnaire. This favorable experience suggests that case-discussion teaching can be employed successfully in teaching principles of epidemiology and biostatistics to medical students.

Should CT Play a Greater Role in Preventing the Resection of Granulomas in the Era of PET

OBJECTIVE PET cannot distinguish between bronchogenic carcinoma and granuloma, but positive scans may prompt surgery. We systematically evaluated the CT appearance of resected carcinomas and granulomas to identify features that could be used to reduce granuloma resections. MATERIALS AND METHODS We retrospectively identified 93 consecutive patients between January 2005 and November 2008 who had resection of a pulmonary nodule pathologically diagnosed as bronchogenic carcinoma or granuloma and preoperative imaging with CT and PET. Each nodule was evaluated on CT for size, doubling time, location, borders, shape, internal characteristics, calcification, clustering, air bronchograms, and cavitation. A diagnostic impression was rendered. Bivariate and logistic regression analyses were performed. Pre-PET data regarding the proportion of resected granulomas and carcinomas between January 1995 and December 1996 were reviewed. RESULTS Sixty-eight percent (65/96) of nodules were carcinomas and 32% (31/96) were granulomas. The CT impression was benign in 65% (20/31) of granulomas and 5% (3/65) of carcinomas (p < 0.0001; negative predictive value [NPV], 87% [20/23]). Specific CT features significantly associated with granuloma were clustering, cavitation, irregular shape, lack of pleural tags, and solid attenuation. The combination of nonspiculated borders, irregular shape, and solid attenuation had an NPV of 86% (12/14). Granulomas represented 18% (9/50) of resected nodules in 1995 and 1996 (p = 0.066). CONCLUSION CT findings reduce but cannot eliminate the possibility that a nodule is malignant. Outcomes-based clinical trials are needed to determine whether CT features of benignity can guide less-invasive initial management and reverse a concerning trend in granuloma resection.

Normal myocardial perfusion on 64-detector resting cardiac CT

BACKGROUND Computed tomography (CT) of the heart is increasingly used to characterize not only the coronary arteries but also cardiac structure and function. The performance of CT in depicting myocardial perfusion is under active investigation. OBJECTIVE We describe the pattern of normal myocardial perfusion on resting 64-detector cardiac CT. METHODS Patients (n = 33; 20 women, 13 men; mean age, 52 years) with normal radionuclide myocardial perfusion imaging and normal coronary arteries on CT angiography (120 kVp) comprised the study population. Segmental myocardial perfusion on CT was measured in Hounsfield units (HU) with manual and semiautomated methods for the 17-segment American Heart Association model in both systole and diastole. Segments were aggregated into coronary artery territories, from apex to base and by myocardial wall. The relationships between myocardial perfusion and various patient factors were evaluated. RESULTS Overall mean myocardial perfusion was 98 HU in systole and 94 HU in diastole with the manual method (P = .011) and 92 HU in systole and 95 HU in diastole with the automated method (P = .001). The septum showed significantly higher mean attenuation values than the other walls in systole and diastole with both methods. Generally, attenuation values were lower in the left circumflex artery territory and in the apex. Bivariate analysis showed higher mean myocardial attenuation values for women than men, although this difference did not persist on multivariate analysis adjusted for patient size. CONCLUSION Normal mean resting myocardial perfusion correlates with CT attenuation values of approximately 92-98 HU on CT angiography in the coronary arterial phase. The septum consistently shows greater attenuation values than the other walls.

Women's knowledge and experience of atypical pap results in a high risk community

ABSTRACT We sought to describe the knowledge of, understanding of, and follow-up after atypical cervical cytology among low-income, urban women. Of 554 women who had an ASCUS or atypical Pap result in 1996, 215 (39%) completed a telephone survey. Many (19%) had poor follow-up. Thirty percent of women denied ever being told of abnormal cytology; Spanish-speakers were more likely to be unaware (43.2% vs. 22.7%, p < .01) of abnormal cytology. Cancer fear was quite high, as were misconceptions regarding cause. Many women were unsatisfied with the information they received regarding their cytology.

Retained fibrin sheaths: chest computed tomography findings and clinical associations.

Purpose: Fibrin sheaths may develop around long-term indwelling central venous catheters (CVCs) and remain in place after the catheters are removed. We evaluated the prevalence, computed tomographic (CT) appearance, and clinical associations of retained fibrin sheaths after CVC removal. Materials and Methods: We retrospectively identified 147 adults (77 men and 70 women; mean age 58 y) who underwent CT after CVC removal. The prevalence of fibrin sheath remnants was calculated. Bivariate and multivariate analyses were performed to assess for associations between sheath remnants and underlying diagnoses leading to CVC placement; patients’ age and sex; venous stenosis, occlusion, and collaterals; CVC infection; and pulmonary embolism. Results: Retained fibrin sheaths were present in 13.6% (20/147) of cases, of which 45% (9/20) were calcified. Bivariate analysis revealed sheath remnants to be more common in women than in men [23% (16/70) vs. 5% (4/77), P=0.0018] and to be more commonly associated with venous occlusion and collaterals [30% (6/20) vs. 5% (6/127), P=0.0001 and 30% (6/20) vs. 6% (7/127), P=0.0003, respectively]. Other variables were not associated. Multivariate analysis confirmed the relationship between fibrin sheaths and both female sex (P=0.005) and venous occlusion (P=0.01). Conclusions: Retained fibrin sheaths were seen on CT in a substantial minority of patients after CVC removal; nearly half of them were calcified. They were more common in women and associated with venous occlusion.

Evaluation of the cardiac chambers on axial CT: comparison with echocardiography.

Objective To evaluate qualitative and simple quantitative measures of all 4 cardiac chamber sizes on computed tomography (CT) in comparison with transthoracic echocardiography (TTE). Methods We retrospectively identified 104 adults with electrocardiographically gated cardiac CT and TTE within 3 months. Axial early diastolic (75% R-R) CT images were reviewed for qualitative chamber enlargement, and each chamber was measured linearly. Transthoracic echocardiography was reviewed for linear, area, and volume measurements. Interrater agreement was calculated using Cohen &kgr; and Pearson correlation. Results There were significant correlations between linear left atrium and left ventricle sizes by CT and TTE (r = 0.686 and r = 0.709, respectively). Correlations for right atrium and right ventricle measurements were lower (r = 0.447 and r = 0.492, respectively). Agreement between CT and TTE for qualitative chamber enlargement was poor (highest &kgr; = 0.35). Computed tomography sensitivity was ⩽ 62% for enlargement of all chambers. Conclusions Linear CT measurements of left-sided chamber sizes correlate well with TTE. Right heart measurements and qualitative assessments agreed poorly with TTE.

Online versus paper evaluations: differences in both quantitative and qualitative data

This study sought to determine if differences exist in the quantitative and qualitative data collected with paper and online versions of a medical school clerkship evaluation form. Data from six-and-a-half years of clerkship evaluations were used, some collected before and some after the conversion from a paper to an online evaluation system. The quantitative data consisted of a composite score based on the average of several Likert-type items; the qualitative data consisted of open-ended comments about the clerkships. Clerkship ratings were more positive in the online version. Students made significantly longer comments about both strengths and weaknesses on the online form than on the paper form. In addition, comments made on the online form were judged to be more informative and showed less evidence of “negativity” than those made on the paper form. The findings suggest that both quantitative and qualitative data obtained with online evaluation forms can differ in important ways from data collected with paper forms.

Assessing third-year medical students' ability to address a patient's spiritual distress using an OSCE case.

Purpose To inform curricular development by assessing the ability of third-year medical students to address a patient’s spiritual distress during an acute medical crisis in the context of an objective structured clinical examination (OSCE) case. Method During March and April 2010, 170 third-year medical students completed an eight-station videotaped OSCE at Albert Einstein College of Medicine of Yeshiva University. One of the standardized patients (SPs) was a 65-year-old man with acute chest pain who mentioned his religious affiliation and fear of dying. If prompted, he revealed his desire to speak with a chaplain. The SP assessed students’ history taking, physical examination, and communication skills. In a postencounter written exercise, students reported their responses to the patient’s distress via four open-ended questions. Analysis of the postencounter notes was conducted by three coders for emergent themes. Clinical skills performance was compared between students who reported making chaplain referral and those who did not. Results A total of 108 students (64%) reported making a chaplain referral; 4 (2%) directly addressed the patient’s religious/spiritual beliefs. Students’ clinical performance scores showed no significant association with whether they made a chaplain referral. Conclusions Findings suggest that the majority of medical students without robust training in addressing patients’ spiritual needs can make a chaplain referral when faced with a patient in spiritual crisis. Yet, few students explicitly engaged the patient in a discussion of his beliefs. Thus, future studies are needed to develop more precise assessment measures that can inform development in spirituality and medicine curricula.

Coronary artery dilation in sickle cell disease.

OBJECTIVE To evaluate the prevalence of coronary artery dilation in children with sickle cell disease (SCD). STUDY DESIGN This is a retrospective analysis performed in patients, between 10 and 19 years old, with SCD who underwent a routine transthoracic echocardiographic evaluation over a 20-month period. The left main, left anterior descending, and proximal right coronary artery diameters, as well as clinical and laboratory variables and other echocardiographic results were collected. Echocardiographic measurements were converted to z scores by using information from a large control population of normal children. Coronary artery ectasia (CAE) was defined as a coronary artery diameter z score ≥ 2. The patients with CAE were compared with those without CAE by using univariate and multivariate analyses. RESULTS Seventeen of 96 patients with SCD (17.7%) had CAE. There were no differences in sex, age, height, weight, body surface area, or genotype between those with and those without CAE. Patients with CAE had larger left ventricular end-diastolic dimension, shortening fraction, septal thickness, posterior wall thickness, mass, mass-to-volume ratio, and white blood cell count. Multivariate analysis revealed that the mass-to-volume ratio and elevated white blood cell count were associated with CAE. CONCLUSION CAE is common in SCD and is associated with left ventricular hypertrophy and inflammation.

Educational video tool to increase syphilis knowledge among black and Hispanic male patients.

Study objective. To determine the effectiveness of an educational video entitled Syphilis and Men to increase syphilis knowledge among at-risk Black and Hispanic male patients. Methods. In this randomized controlled trial, participants were randomly assigned to one of four groups and completed a pre-test survey, viewed the video (intervention group) and/or completed a post-test knowledge survey. Our analysis assessed whether the intervention group in comparison to the control group had an increase in syphilis knowledge, regardless of self-reported socio-demographic and sexual behavior characteristics associated with increased risk for syphilis infection. Results. Two hundred and six (206) males were studied. The intervention group participants scored on average 24.8 percentage points higher than the control group participants (p<.001) on the post-test survey after viewing the video. This difference was present regardless of certain self-reported socio-demographic and sexual behavior characteristics associated with increased risk for syphilis infection. Conclusion. The Syphilis and Men video is a five-minute, low-cost tool that increased syphilis knowledge among Black and Hispanic male patients and could have similar effects in other settings.