The Mitral Valve by Three-Dimensional Echocardiography

A comprehensive evaluation of patients with mitral valve disease must include an echocardiographic examination of the mitral valve apparatus and resultant hemodynamic changes due to mitral pathology. Three-dimensional echocardiography has impacted on the diagnosis of mitral valve prolapse but has mostly existed in a research realm. After decades of development, three-dimensional echocardiography is now easily performed and readily incorporated in the assessment of mitral valve disease in daily clinical practice. Unique anatomic views of the mitral valve, accurate quantitative assessment of the mitral valve orifice area, and delineation of segmental prolapse are several advantages of three-dimensional echocardiography. Moreover, there is a wealth of data that can be derived from a three-dimensional volume, enabling more detailed analysis of mitral valve apparatus and valve annular dynamics. This review highlights current applications of three-dimensional echocardiography in the routine evaluation of mitral valve disease.     

Social support in cyberspace: the next generation

The goal of the Women to Women Project (WTW) is to help chronically ill rural women to adapt to their long-term illnesses by providing support and health information via computers. The specific aims are to (1) assess the impact of the computer-based intervention on psychosocial health (self-efficacy, self-esteem, empowerment, social support, stress, depression, loneliness), computer literacy skills, and health knowledge; and (2) analyze the computer exchanges for insights to explicate the complex process of adapting to chronic illness within the rural context. Participants are 240 rural women with a chronic illness who reside in rural areas of Montana, Idaho, Wyoming, North Dakota, and South Dakota. Preliminary data analysis suggests that the intervention is helping to improve the women's ability to adapt to their chronic illnesses. The WTW intervention model has the potential to effectively connect these women in a program of support and education.     

Thalamic,pallidal, or subthalamic surgery for Parkinson’s disease?

Sydenham’s chorea (SC) may occur in rheumatic fever (RF) patients without arthritis and carditis. In this study we typed HLA antigens and alleles in patients presenting with the distinct major clinical manifestations of RF, i.e., chorea, carditis, or arthritis, in population and family studies. We evaluated 91 patients with RF for HLA-A, HLA-B, and HLA-DR antigens; of these, 33 had pure chorea, 26 pure carditis, 16 pure arthritis, and 16 carditis plus arthritis. We also typed 24 SC patients and their unaffected siblings for HLA-DRB1 and HLA-DQB1 alleles using molecular methods. HLA-B49 and HLA-DR1 antigens were overrepresented in the total group of patients with RF and in all the subgroups studied, excluding the SC subgroup in which the frequency of HLA-DR1 antigen was not increased. The frequencies of the HLA-DRB1 and HLA-DQB1 alleles in patients with pure chorea were not significantly different from those observed in controls. Similarly, the frequencies of HLA class II alleles in SC patients did not differ significantly from those observed in unaffected siblings. These findings show that immunogenetic susceptibility to RF varies according to the major clinical manifestation presented by the patient. Received: 9 April 1999/Received in revised form: 16 August 1999/Accepted: 22 October 1999     

Evaluation of suspected appendicitis in children and young adults: helical CT

PURPOSE: To evaluate the accuracy of helical computed tomography (CT) for the diagnosis of appendicitis in children and to assess the utility of CT in establishing alternative diagnoses. MATERIALS AND METHODS: The medical records of 154 children (median age, 12 years; age range, 1-20 years) who were suspected to have appendicitis and who underwent CT were reviewed. The gastrointestinal tract was opacified in 151 of 154 patients: Only orally administered contrast material was used in 126 patients; only rectally administered contrast material, in 21 patients; and both oral and rectal contrast material, in four patients. CT findings were correlated with surgical and histopathologic findings or with clinical follow-up findings. RESULTS: Sixty-four CT scans were interpreted as positive for appendicitis and included 58 true-positive and six false-positive scans. Ninety scans were interpreted as negative and included 87 true-negative and three false-negative scans. CT had a sensitivity of 95% and a specificity of 94% for the diagnosis of appendicitis. In addition, in 32 (34%) of 93 patients without appendicitis, an alternative diagnosis was established on the basis of CT findings. CONCLUSION: Helical CT is useful in a pediatric population to diagnose or exclude appendicitis and to establish an alternative diagnosis.     

Role of the beta 2 adrenoceptor in mediating positive inotropic activity in the failing heart and its relation to the hemodynamic actions of dopexamine hydrochloride

In patients with severe congestive heart failure, it has been suggested that since myocardial beta 1 adrenoceptors are selectively down-regulated, activation of beta 2 receptors may be a preferable approach to augmenting contractility. Accordingly, dopexamine hydrochloride (1, 2 and 4 micrograms/kg/min) and dopamine (2 and 4 micrograms/kg/min) were administered to 8 patients with dilated cardiomyopathy. Left ventricular (LV) dimensions, thicknesses and pressures were obtained using simultaneous high-fidelity pressure measurements and echocardiographic recordings. LV contractility was assessed using the load-independent relation between LV end-systolic wall stress and rate-corrected velocity of fiber shortening. Cardiac index increased in a dose-related manner with both drugs, and was accompanied by a decline in systemic vascular resistance, a measure of peripheral arteriolar tone. LV end-diastolic pressure was unaltered except for a decrease from 29 +/- 6 to 19 +/- 5 mm Hg (p less than 0.017) at the highest dose of dopexamine hydrochloride. Heart rate was unchanged during the infusion of dopamine but increased significantly with dopexamine hydrochloride. LV end-systolic wall stress, a measure of LV internal load, decreased with both drugs. With dopamine, a dose-dependent positive inotropic effect was observed. Dopexamine hydrochloride, at the 4 micrograms/kg/min infusion dose, exerted a mild positive inotropic effect comparable to that noted with dopamine at 2 micrograms/kg/min. Thus, dopamine and dopexamine hydrochloride improved overall LV performance. With dopamine, a substantial positive inotropic effect occurred in association with a reduction in LV afterload. The increased cardiac index observed with dopexamine hydrochloride was due primarily to peripheral vasodilatation and a positive chronotropic effect.(ABSTRACT TRUNCATED AT 250 WORDS)     

Relationship between persistence of abdominal symptoms and successful outcome after cholecystectomy

BACKGROUND: Patients frequently have persistent abdominal symptoms after undergoing cholecystectomy. The relationship between abdominal symptoms and biliary dysfunction is often unclear. OBJECTIVES: To describe the persistence rate of abdominal symptoms in a large cohort of patients after elective cholecystectomy, to identify predictors of symptom persistence and operative success, to understand which symptoms improve after cholecystectomy, and to describe the important determinants of an unsuccessful operation. METHODS: Secondary analysis of a prospective, multisite cohort study of 2481 patients undergoing elective cholecystectomy. RESULTS: The mean +/- SD number of abdominal symptoms per patient decreased from 3.1 +/- 2.0 to 1.1 +/- 1.3; 27% of patients who identified a symptom as most bothersome before surgery still had the symptom 6 months after surgery. Symptom persistence rates ranged from 5.6% (vomiting) to 40.2% (gas/flatulence). A balance score that quantified the abdominal symptom mix between dyspeptic and biliary symptoms shifted after surgery to the dyspeptic category. Predictors of persistence of a most bothersome symptom were dyspeptic symptom category, worse operative risk and self-rated health status, symptom duration longer than 6 months, and no previous episodes of acute cholecystitis. The major correlate of not achieving a very successful outcome (15.2% of patients) was the presence of postoperative abdominal pain. Other predictors included worse self-rated health status and physical functioning, symptom duration longer than 6 months before surgery, and no previous episodes of acute cholecystitis. CONCLUSIONS: Symptoms categorized as dyspeptic were more likely to persist than were biliary symptoms, although all symptoms showed a decrease in prevalence after cholecystectomy. More attention to the rationale for gallbladder removal and clarification of patient expectations for symptom relief might be necessary to improve outcomes after elective cholecystectomy.