The epidemiology and clinical characteristics of patients with newly diagnosed alcohol-related liver disease: results from population-based surveillance.

GOALS: We describe the epidemiology of outpatients newly diagnosed with chronic alcoholic liver disease and describe predictors of cirrhosis and referral for specialty care. BACKGROUND: Alcohol is a major cause of liver disease in the United States. Most previous work has described hospitalized patients. STUDY: Participants were identified through prospective population-based surveillance in gastroenterology practices Multnomah County, Oregon and New Haven County, Connecticut; and primary care and gastroenterology practices from Kaiser Permanente Northern California in Alameda County during 1999 to 2001. Patients were interviewed, a blood specimen obtained, and their medical record reviewed. RESULTS: We identified 82 patients from gastroenterology practices with newly diagnosed alcoholic liver disease. Their median age was 50.0 years. 72.0% were male and 79.3% were White. The median age at initiation of alcohol use was 17.0 years. 43.9% of patients had evidence of cirrhosis at the time of diagnosis. Only 40.2% reported alcohol as the cause of their liver disease. Patients with cirrhosis were more likely to be older, have a higher median number of years of heavy alcohol consumption, and to have been hospitalized for a liver-related complication than noncirrhotic patients. An additional 83 primary care patients were more likely to be older, to be drinking alcohol at study interview, and to not have cirrhosis than patients referred for gastroenterology care. CONCLUSIONS: Patients with alcoholic liver disease may present at a late stage and may not identify alcohol as a cause for their liver disease. Improved patient screening and education may limit morbidity and mortality.

A comparison of hepatopathologists' and community pathologists' review of liver biopsy specimens from patients with hepatitis C.

BACKGROUND & AIMS: Assessment of liver histology has an important role in the management of chronic liver disease. It is not clear whether there are interobserver variabilities between hepatopathologists and general community pathologists. We evaluated the effect of type of pathologist and biopsy specimen size on interobserver agreement for hepatic fibrosis. METHODS: Subjects were identified from a population-based sample of adults from a chronic liver disease surveillance network. Biopsy slides from 391 hepatitis C patients who had undergone liver biopsy were obtained and read by 2 study hepatopathologists blinded to the patients' diagnoses (the gold standard). The interobserver agreement of the fibrosis stage between the hepatopathologists and the general pathologists' report were evaluated by kappa index. RESULTS: There was complete agreement between the study pathologist and community pathologist in 49.9% of biopsy specimens. The overall kappa index across all stages of fibrosis was 0.409, with the best agreement occurring at higher stages of fibrosis (kappa: 0.482 for stage 3, 0.776 for stage 4). Overall agreement was good (kappa, 0.465) when biopsy samples were greater than 1.5 cm in size. The community pathologist understaged fibrosis in 73% of biopsy specimens with disagreement. A total of 26% of patients with stages 2 to 4 fibrosis were understaged by the community pathologist. CONCLUSIONS: Results from this population-based study show good overall interobserver agreement between hepatopathologists and general pathologists when determining fibrosis stage in liver biopsy specimens from hepatitis C patients when liver biopsy sizes are adequate. However, community pathologists tended to understage fibrosis, which could keep patients from receiving proper treatment.

The epidemiology of newly diagnosed chronic liver disease in gastroenterology practices in the United States: results from population-based surveillance.

OBJECTIVES: Chronic liver disease (CLD) is an important cause of morbidity and mortality, but the epidemiology is not well described. We conducted prospective population-based surveillance to estimate newly diagnosed CLD incidence, characterize etiology distribution, and determine disease stage. METHODS: We identified cases of CLD newly diagnosed during 1999-2001 among adult county residents seen in any gastroenterology practice in New Haven County, Connecticut; Multnomah County, Oregon; and Northern California Kaiser Permanente Medical Care Program (KPMCP, Oakland, California [total population 1.48 million]). We defined CLD as abnormal liver tests of at least 6 months' duration or pathologic, clinical, or radiologic evidence of CLD. Consenting patients were interviewed, a blood specimen obtained, and the medical record reviewed. RESULTS: We identified 2,353 patients with newly diagnosed CLD (63.9 cases/100,000 population), including 1,225 hepatitis C patients (33.2 cases/100,000). Men aged 45-54 yr had the highest hepatitis C incidence rate (111.3/100,000). Among 1,040 enrolled patients, the median age was 48 yr (range 19-86 yr). Hepatitis C, either alone (442 [42%]) or in combination with alcohol-related liver disease (ALD) (228 [22%]), accounted for two-thirds of the cases. Other etiologies included nonalcoholic fatty liver disease (NAFLD, 95 [9%]), ALD (82 [8%]), and hepatitis B (36 [3%]). Other identified etiologies each accounted for <3% of the cases. A total of 184 patients (18%) presented with cirrhosis, including 44% of patients with ALD. CONCLUSIONS: Extrapolating from this population-based surveillance network to the adult U.S. population, approximately 150,000 patients with CLD were diagnosed in gastroenterology practices each year during 1999-2001. Most patients had hepatitis C; heavy alcohol consumption among these patients was common. Almost 20% of patients, an estimated 30,000 per year, had cirrhosis at presentation. These results provide population-level baseline data to evaluate trends in identification of patients with CLD in gastroenterology practices.

Standardized Goal-Directed Valsalva Maneuver for Assessment of Inducible Left Ventricular Outflow Tract Obstruction in Hypertrophic Cardiomyopathy.

BACKGROUND: The Valsalva maneuver is widely used to provoke left ventricular outflow tract obstruction in hypertrophic cardiomyopathy (HCM). Whereas early experiments used a standardized, goal-directed approach by maintaining an intraoral pressure >40 mm Hg for >10 sec, current practice depends on patients' understanding and effort. The aim of this study was to evaluate the clinical effectiveness of the goal-directed Valsalva maneuver (GDV) in HCM as a method to provoke left ventricular outflow tract obstruction. METHODS: In this prospective study, patients blew into a syringe barrel connected to a manometer with rubber tubing and maintained an intraoral pressure of >40 mm Hg for >10 sec (GDV). Using Doppler echocardiography, peak left ventricular outflow tract gradient (pLVOTG) was measured at rest and using the provocative maneuvers of the self-directed Valsalva maneuver (SDV), GDV, and exercise. RESULTS: A total of 52 patients were included. Mean pLVOTG with GDV was higher compared with SDV (48 vs 38 mm Hg, P = .001, n = 52) and was similar to exercise (GDV, 52 mm Hg; exercise, 58 mm Hg; P = .42; n = 43). Reclassification to obstructive HCM (pLVOTG ≥ 30 mm Hg) with GDV was significantly higher than with SDV (38% vs 16.6%, P = .016) and comparable with exercise (50%, P = .51). Reclassification to severe obstruction (pLVOTG ≥ 50 mm Hg) was higher with GDV compared with SDV (28.3% vs 13.5%, P = .045) and was similar to exercise (29.7%). Furthermore, GDV identified two patients with occult severe obstruction in isolation. CONCLUSIONS: GDV is an objective, practical, and effective physiologic method of provoking left ventricular outflow tract obstruction. It can significantly alter patient management by reclassifying disease severity and should be incorporated in the routine clinical evaluation of patients with HCM.

A Unique Case of Common Peroneal Nerve Entrapment.

The authors present a case of a previously healthy 36-year-old man with a 3-day history of spontaneous complete right lower extremity foot drop. He noticed the symptoms immediately when he attempted to stand after waking from sleep. The patient had no history of similar symptoms, recent trauma, or peripheral nerve disease. Physical examination showed a slap foot gait, complete numbness of the lateral leg and dorsal foot, and 0/5 strength with ankle and great toe dorsiflexion and ankle eversion. Serum laboratory studies showed normal values. Nerve conduction studies confirmed increased latency and decreased amplitude of the right peroneal nerve at the knee, whereas electromyography showed denervation of the tibialis anterior and extensor digitorum brevis. Anteroposterior and lateral radiographs showed a normal right knee with the exception of a posterior fibular neck exostosis. Physical therapy, an ankle-foot orthosis, and a 5-day course of oral prednisone burst (50 mg) were prescribed. After 1 month of therapy without resolution, the patient underwent surgical release of the common peroneal nerve and excision of the bony prominence. Twelve days postoperatively, the patient had no sensory improvements but had improved findings on motor examination. Three months postoperatively, the patient had near-normal sensation to light touch in the superficial and deep peroneal nerves, with 5/5 strength and a normal gait. The patient returned to all activity without limitations. The authors present this unique case describing a fibro-osseous source of common peroneal compressive neuropathy and review the literature for spontaneous peroneal entrapment, highlighting the importance of prompt diagnosis and treatment.

Developing and assessing curriculum on the physics of medical instruments.

Undergraduate educational settings often struggle to provide students with authentic biologically or medically relevant situations and problems that simultaneously improve their understanding of physics. Through exercises and laboratory activities developed in an elective Physics in Biomedicine course for upper-level biology or pre-health majors at Portland State University, we aim to teach fundamental physical concepts, such as light absorption and emission and atomic energy levels, through analysis of biological systems and medical devices. The activities address the properties of electromagnetic waves as they relate to the interaction with biological tissue and make links between physics and biomedical applications such as microscopy or laser eye surgery. We report on the effect that engaging students in tasks with actual medical equipment has had on their conceptual understanding of light and spectroscopy. These initial assessments indicate that students' understanding improves in some areas as a result of taking the course, but gains are not uniform and are relatively low for other topics. We also find a promising "nonshift" in student attitudes toward learning science as a result of taking the course. A long-term goal of this work is to develop these materials to the extent that they can eventually be imported into an introductory curriculum for life sciences majors.