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Biomedical subjects

Bernard Karnath

Publications and source records attributed to Bernard Karnath.

9 recordsLinked to original sources
PubMed2004

Subdural hematoma. Presentation and management in older adults.

Subdural hematomas pose diagnostic and therapeutic difficulties in older adults. Presenting signs and symptoms of subdural hematomas--headache, confusion, ataxia, and hemiparesis--can mimic other diseases such as dementia, stroke, transient ischemic attacks, neoplasm, and normal pressure hydrocephalus. Patients with subdural hematomas and focal neurologic signs should be considered for surgical Intervention, whereas asymptomatic patients or patients with only complaints of a headache can be managed medically or followed with serial neuroimaging by computed tomography. Patients who have been chronically anticoagulated pose a dilemma when they present with a subdural hematoma.

Aged↗
PubMed2003

Pityriasis rosea. Appearance and distribution of macules aid diagnosis.

A 40-year-old man presented with a 1-week history of a diffuse pruritic rash. The patient denied having had fever, chills, or a recent respiratory infection. He could not recall having an initial patch. Physical examination revealed numerous small, scaly patches on his trunk (figure 1). The rash spared the palms of his hands and soles of his feet as well as the distal extremities.

Adult↗
PubMed2002

Smoking cessation.

Smoking is a risk factor for the four leading causes of death in the United States, yet 48 million Americans--24% of the U.S. adult population--continue to smoke. Approximately 70% of people who smoke visit a physician each year, yet only half report ever being advised to quit smoking by their physician. Smoking cessation is difficult due to nicotine addiction and withdrawal symptoms. Expert groups such as the National Cancer Institute and the Agency for Health Care Policy and Research offer protocols for smoking cessation that primary care physicians can use in their office practice. Recent developments in the pharmacotherapy of smoking cessation has led the U.S. Public Health Service to update the practice guidelines for treating tobacco use and dependence. Pharmacotherapy, which includes nicotine replacement therapy, offers assistance to patients who want to stop smoking. However, the cost of pharmacotherapy may be a barrier for some. Other nonpharmacologic therapies, such as counseling, are also effective.

Aged↗
PubMed2002

Teaching and testing physical examination skills without the use of patients.

OBJECTIVE: To design a cardiopulmonary physical exam curriculum that does not involve the use of patients. Bedside teaching is becoming a lost art, and the use of alternative methods of instruction such as simulation has become increasingly important. Simulators have been shown to enhance physical examination skills of students and physicians in training.(1) DESCRIPTION: In 1995, a program was started to improve cardiopulmonary physical diagnosis and the teaching of auscultation at the University of Texas Medical Branch at Galveston (UTMB). The teaching manikin "Harvey" played a vital role in the development of the new curriculum. In 1997, UTMB adopted an organ-based approach to the basic science curriculum. The cardiopulmonary module in the basic science curriculum was a ten-week course taught in the second year of medical school. The physical diagnosis section of that course involved six instructional hours; four of the six hours were dedicated to cardiac auscultation and two hours to pulmonary auscultation. Only simulators and CD-ROMs were used for instruction. The 184 second-year medical students at UTMB were formed into small groups for instruction and practice. Although "Harvey" was an effective teaching tool, other simulators had to be developed for testing students' skills after instruction. It would be very difficult to administer a skills OSCE for 184 students without the development of several smaller transportable simulators. A commercially available blood pressure simulator from the Medical Plastics Laboratory, Inc., Gatesville, TX, was used to test the accuracy of students' blood pressure readings. Small auscultation transducers combined with a palpable pulse simulator, developed by one of the authors (WT) in collaboration with Andries Acoustics, Spicewood, TX, were used to efficiently test students' proficiency in cardiopulmonary auscultation. Digital simulated cardiopulmonary sounds were recorded onto a standard CD-ROM mini-disc and transmitted to the small transducers. Students used their own stethoscopes for auscultation. The targeted skills were efficiently tested in one hour of testing time per student. DISCUSSION: This cardiopulmonary instructional module was well received by the second-year medical students. In the skills OSCE, 80% of the students accurately measured systolic and diastolic blood pressure to within 5 mm Hg. Cardiopulmonary auscultation proficiency results showed average recognition of 60% for cardiac abnormalities and 88% for pulmonary sounds. Developing auscultation transducers with pulse simulation capability ensured that students could identify systole. Therefore, heart murmurs and sounds could be timed with the cardiac cycle. We found the results from the skills OSCE encouraging. Most students demonstrated reasonable competency in the skills taught, and the new transportable simulators performed well. The six-hour instructional module was meant to prepare students for their bedside teaching during the third year of medical school. The significant cost of the "Harvey" simulator may be a barrier to its widespread use for teaching. Therefore, continued development of smaller transportable simulators for teaching and testing purposes is important.

Clinical Competence↗
PubMed2002

Incorporating simulators in a standardized patient exam.

OBJECTIVE: Using simulated patients during a clinical skills exam that involves many students has the advantage of standardizing the delivery of historical data. One major disadvantage is the inability to standardize the physical exam findings. We designed a simulated patient exam that incorporates simulated abnormal physical exam findings. DESCRIPTION: The simulated patient exam case was divided into three separate stations: (1) the simulated patient's history, (2) the simulated physical exam, and (3) the presentation station. Dyspnea was chosen as the chief complaint because of the broad differential of possible cardiac and pulmonary auscultatory findings. In the first station, students obtained historical data from the standardized simulated patient. Students were graded on their ability to ask appropriate historical questions. Trained observers were used to verify the numbers of historical cues obtained by the students. The second station consisted of simulated physical exam findings. Students first measured the blood pressure on a commercially available blood pressure simulator arm from the Medical Plastics Laboratory, Inc., Gatesville, TX. Students then auscultated an abnormal digital heart sound and pulmonary sound from a small auscultation transducer developed by Andries Acoustics, Spicewood, TX. Students also palpated a simulated pulse from a newly developed pulse transducer. Digital cardiopulmonary sounds and pulse data were recorded onto a CD-ROM disc and transmitted to the small transducers via a CD-ROM disc player. Students used their own stethoscopes to auscultate cardiopulmonary sounds from the small transducers. The students were graded in the second station on their ability to accurately measure a blood pressure, identify abnormal cardiopulmonary digital sounds, and finally describe a peripheral pulse. In the third station, students presented the historical data and physical exam findings to a faculty member, and then provided a differential diagnosis list based on their key findings from the other two stations. A total of 171 students (n = 171) completed the simulated patient exam. Each student completed the exam in 45 minutes. DISCUSSION: In our simulated patient exam, students were evaluated not only on their data-gathering skills for key historical findings but also on the ability to correctly identify key physical exam findings such as abnormal cardiopulmonary sounds. Key physical exam findings were then integrated into the clinical decision-making process, which was presented in the faculty presentation station. Simulated patients with abnormal cardiopulmonary findings can be used for testing purposes. However, cardiac auscultatory abnormalities such as the ventricular S3 gallop are difficult to find and usually occur in a decompensated state such as heart failure. Other physical exam findings such as pulmonary crackles and wheezes also occur in decompensated conditions. Therefore, the use of simulators during a simulated patient exam offers the possibility of introducing several abnormal physical exam findings without having an unstable patient present in an exam setting. Further, the use of simulated physical exam findings allows for complete standardization of a clinical-simulated patient exam.

Clinical Competence↗
PubMed2002

Acute mediastinal widening.

Mediastinal abscess resulting from descending necrotizing mediastinitis is a rare infectious process. Odontogenic infections are the most commonly implicated underlying process. Descending necrotizing mediastinitis is a rapidly progressive infectious process that spreads through the fascial planes of the neck to gain access to the mediastinum. Early recognition of descending necrotizing mediastinitis is important because the reported mortality rate is 30% to 50% even in the antibiotic era. Clues to the diagnosis of descending necrotizing mediastinitis include evidence of severe oropharyngeal infection, neck swelling and crepitations, and complaints of dysphagia and odynophagia. Lateral radiographs of the neck sometimes show gas pockets, but chest films are often negative early in the disease process. A late chest x-ray finding is widening of the superior mediastinum. Therefore, computed tomography (CT) is the imaging procedure of choice. Optimal treatment includes adequate drainage of the neck and mediastinum and broad spectrum intravenous antibiotics. Commonly implicated organisms are alpha-hemolytic streptococci and Bacteroides fragilis.

Acute Disease↗