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Biomedical subjects

R Shulman

Publications and source records attributed to R Shulman.

At least 19 recordsLinked to original sources

Treatment of pulmonary hypertension in the general adult intensive care unit: a role for oral sildenafil?

Use of inhaled nitric oxide for treatment of pulmonary hypertension in adult critical illness is limited by its mode of delivery and high costs, prompting evaluation of alternative therapies. We report the use of oral sildenafil in a patient with severe secondary pulmonary hypertension and right ventricular dysfunction. Following reduction in mean pulmonary artery pressure and pulmonary vascular resistance with inhaled nitric oxide, crossover to sildenafil therapy maintained control of pulmonary hypertension, facilitating discontinuation of respiratory and cardiovascular organ support. The relative pulmonary vascular specificity of oral sildenafil, and its low cost, makes it an attractive therapeutic alternative to inhaled nitric oxide, and warrants further study.

Administration, Oral↗

Linkage study of polymorphisms in the gene for myelin oligodendrocyte glycoprotein located on chromosome 6p and attention deficit hyperactivity disorder.

Family and twin studies have shown that there is a substantial genetic contribution to both reading disabilities (RD) and attention deficit hyperactivity disorder (ADHD), and recent twin studies have suggested that the overlap between these phenotypes is largely due to common genetic influences. Studies using a linkage approach to search for genes for susceptibility to RD and ADHD have identified regions linked to each of these phenotypes separately, with recent studies suggesting that some chromosomal regions may contribute to both. Linkage to the human leukocyte antigen (HLA) region has been targeted in particular for RD and ADHD, as both of these disorders have been suggested to be autoimmune. Linkage to the HLA region of 6p for RD has now been reported by several groups. Alleles at two genes in the HLA (C4B and DRB1) have also been reported to be associated with ADHD, prompting one investigator to suggest a possible connection between the linkage of RD and ADHD to this region. The location of the gene for myelin oligodendrocyte glycoprotein (MOG), in the region of 6p with the strongest evidence for linkage to RD, and its proposed role as a minor component of myelin in the central nervous system suggest that it may be a factor in neuronal functioning and therefore a candidate for RD and ADHD. In this study, we tested the gene for linkage to ADHD by genotyping two polymorphisms in the MOG gene-a dinucleotide repeat located upstream from the MOG transcription start site and a Val145Ile substitution in exon 3-in a sample of 104 nuclear families identified through a proband with ADHD. We examined the transmission of the alleles of the Val145Ile and the dinucleotide repeat polymorphisms using the transmission disequilibrium test. We did not observe biased transmission of the alleles at either polymorphism to ADHD probands or siblings. Our findings using this sample do not support the role of the MOG gene in ADHD.

Amino Acid Substitution↗

Splenosis presenting as occult gastrointestinal bleeding.

A 48-year-old man presented with recurrent gastrointestinal bleeding and anemia. Routine endoscopic evaluation was nondiagnostic. Angiography demonstrated multiple apparent arteriovenous malformations. Exploratory laparotomy revealed numerous splenic implants along the small and large bowels, some of which had apparently eroded through the bowel mucosa and bled. Excision of these penetrating lesions prevented further bleeding. An incidentally noted renal cell cancer was also resected. The patient's splenosis was the result of childhood trauma that caused splenic rupture and precipitated splenectomy. Splenosis develops frequently following traumatic splenic rupture. Experimental evidence suggests that the presence of an intact spleen suppresses the growth and development of splenic implants. Following splenectomy, splenules may replace some of the "housekeeping" and immunologic functions of the spleen, but even patients with documented splenosis should be considered functionally hyposplenic. While in most cases splenules cause no symptoms, splenosis must be considered in the differential diagnosis of previously splenectomized patients who present with unexplained masses or occult bleeding.

Diagnosis, Differential↗

The effect of dental rehabilitation on the body weight of children with failure to thrive: case reports.

Four case reports of children with nursing caries and failure to thrive are presented. Without regard to the condition of the dentition, the various cases could be classified as organic, mixed, or nonorganic in etiology. After dental rehabilitation, all patients exhibited an acceleration of weight velocity that resulted in weights above the 5th percentile. During the period of observation, the weight velocity continued to increase with time, consistent with the "catch-up" phenomenon of growth that is observed in nutritionally deprived children.

Bottle Feeding↗

Aerobic versus strength training for risk factor intervention in middle-aged men at high risk for coronary heart disease.

To compare the effects of strength training (ST) to those of aerobic training (AT) for coronary heart disease (CHD) risk factor intervention, we studied 37 previously untrained males (aged 50 +/- 9 years, mean +/- SD) before and after 20 weeks of either ST (N = 14), AT (walk/jog, N = 13), or no exercise (inactive controls, N = 10). Lipoprotein and lipid profiles, blood pressure, and glucose and insulin responses to an oral glucose tolerance test (OGTT) were assessed before and after the training period in all three groups. The ST program produced significant reductions in plasma glucose levels at 60, 90, and 120 minutes (P < .05) after glucose ingestion, whereas the AT program resulted in significant reductions only at 90 and 120 minutes (P < .05). ST also decreased insulin levels during fasting (P < .05) and at 90 and 120 minutes (P < .01) after glucose ingestion. AT decreased insulin levels at 90 and 120 minutes (P < .01) after glucose ingestion. Both training programs reduced the total area under the glucose tolerance curve for glucose (both P < .05) and insulin (both P < .05), but there were no significant differences in these changes between the two groups. None of the glucose or insulin values were significantly altered in the control group. There were no significant changes in lipoprotein and lipid profiles or blood pressure in any of the three groups. These results suggest that ST and AT have comparable effects on risk factors for CHD.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗

Multiple realities. Teaching rounds in an inpatient pediatric service.

Teaching rounds are a mainstay of most educational programs for interns and residents, but little is known about how they are conducted and the role they play in house staff members' learning. We performed a qualitative study of teaching rounds in an inpatient adolescent service using five data sources: observations, interviews, house staff ratings, results of a house staff retreat, and documents outlining faculty responsibilities. Interns, senior residents, and faculty members expressed differing views regarding the purpose, process, and content of rounds; mutual roles and expectations; and time management. An interactive teaching format focused around the visit of a patient to the conference room stimulated house staff interest and learning to a greater extent than did more traditional case presentations and lectures. These results suggest a need to develop a consensus among faculty and house staff regarding the purpose, content, and process of rounds.

Adolescent↗

Lactate rise detected by 1H NMR in human visual cortex during physiologic stimulation.

Brain lactate concentration is usually assumed to be stable except when pathologic conditions cause a mismatch between glycolysis and respiration. Using newly developed 1H NMR spectroscopic techniques that allow measurement of lactate in vivo, we detected lactate elevations of 0.3-0.9 mM in human visual cortex during physiologic photic stimulation. The maximum rise appeared in the first few minutes; thereafter lactate concentration declined while stimulation continued. The results are consistent with a transient excess of glycolysis over respiration in the visual cortex, occurring as a normal response to stimulation in the physiologic range.

Energy Metabolism↗

Strength training does not improve lipoprotein-lipid profiles in men at risk for CHD.

Sixteen untrained males, age 46 +/- 11 yr (mean +/- SD), were studied to determine the effects of 20 wk of strength training on lipoprotein-lipid profiles and post-heparin lipase activities. All subjects had abnormal lipoprotein-lipid profiles and at least two other risk factors for coronary heart disease (CHD). To control for day-to-day variations in blood lipoprotein levels, baseline values were established by taking at least two blood samples on separate days from the training and control groups. The training program resulted in a 50% increase in upper body strength (P less than 0.001) and a 37% increase in lower body strength (P less than 0.001) as measured by the one repetition maximum test (1-RM). No changes in the 1-RM test were observed in the control group. There were no significant changes in VO2max (34.5 +/- 6.4 vs 36.2 +/- 7.4 ml.kg-1.min-1 or percent fat (25.4 +/- 4.2 vs 24.9 +/- 4.1%) with training. There were also no significant changes in plasma concentrations of triglyceride (193 +/- 96 vs 171 +/- 101 mg.dl-1), total cholesterol (231 +/- 22 vs 210 +/- 22 mg.dl-1), and HDL-C (35 +/- 6 vs 36 +/- 8 mg.dl-1), or LDL-C (139 +/- 16 vs 139 +/- 21 mg.dl-1). Furthermore, the activities of post-heparin lipoprotein lipase (9 +/- 4 vs 13 +/- 5 moles.ml-1.h-1) and hepatic lipase (35 +/- 10 vs 35 +/- 9 moles.ml-1.h-1) did not change with training.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗

Biopsychosocial aspects of long-term survival on end-stage renal failure therapy.

At ten-years follow-up of 64 haemodialysis patients, 43 had died and 21 were alive, twelve with cadaver renal transplants and nine on haemodialysis. Examination of the influence of psychological, demographic, physical and biochemical factors revealed the Beck Depression Inventory and age as the two most important predictors of survival. The behaviour of the patient was directly responsible for five (11.6%) of the deaths, by suicide in three cases and dietary non-compliance in two cases. Hypothetical mechanisms linking depression with reduced survival have been reviewed. As the impact of depression on survival was maximal in the first few years of dialysis, monitoring for depression should be incorporated into routine care from the start of dialysis together with evaluative interventions that might enhance survival.

Adolescent↗

The influence of fibronectin administration on the incidence of sepsis and septic mortality in severely injured patients. The Medical College of Georgia Fibronectin Research Group.

Eighty-five trauma patients between the ages of 18 and 55, with American College of Surgeon's (ACOS) trauma scores greater than or equal to 7 were entered into a double-blind, randomized, placebo-controlled study to assess the efficacy of prophylactic fibronectin (Fn) administration on clinical course, sepsis development, and septic mortality. Patients were randomized on admission to receive purified human virus-inactivated Fn or placebo control (human serum albumin, HSA). Fn or HSA was administered on a daily basis if and when the patient was Fn deficient (less than 75% normal). When a Fn deficiency was not evident, the patient received saline. Seventy one patients developed Fn deficiencies during their initial clinical course: 36 received Fn, 35 received HSA. Fourteen patients did not develop a Fn deficiency after trauma and thus received only saline. Analysis of admission data demonstrated no significant differences between the three groups with respect to extent of injury (injury severity score, ACOS trauma score) or physiologic assessments of organ function (serum creatinine, bilirubin, lactic acid). On day 1 after trauma, Fn levels were shown to correlate with other plasma proteins and cellular components (range of r values, 0.24 to 0.75; all p less than 0.05), but not with organ function parameters. Eighteen of 85 patients became septic as judged by clinical criteria. Ten of these patients had received Fn (10 of 36), five had received HSA (5 of 35), and three had received only saline (3 of 14) before the development of sepsis (differences not significant). When septic, nine of 17 patients developed Fn deficiencies. Six patients received Fn while septic, three received albumin, and eight received saline. Seven patients died: 5 of 6 Fn patients, 1 saline, and 1 HSA recipient. Our data suggest that exogenous Fn repletion in states of deficiency does not alter clinical course, the development of sepsis, or septic mortality.

Adolescent↗

What should be taught in psychogeriatrics: a personal viewpoint.

Psychiatry is part of medicine. The goals of medical practice should endorse a biopsychosocial view of illness, and practitioners should accept responsibility for all phases of illness: from the acute stage through rehabilitation to recovery or chronicity. Bedside instruction should emphasize basic clinical skills in history taking and a standard examination that includes the mental state. Liaison psychiatry offers an opportunity for training in psychogeriatrics and for the psychiatrist to re-enter the medical setting in providing health care to the elderly.

Clinical Competence↗

Psychosomatic education: who teaches what and where at the University of British Columbia.

For this enquiry psychosomatic education was defined as education in areas that encompass a psychological as well as biological view of illness. The scope of this activity, undergraduate and postgraduate, was assessed by a review of curriculum content, and by a questionnaire of the clinical faculty that examined their attitudes to psychiatry in Medicine, what they actually taught, and whom they relied on for help. Obstacles to psychosomatic education stemmed from a negative view of Psychiatry as well as the omission of instruction by prestigious role models. The facilitation of psychosomatic education required a greater accessibility of psychiatrists to medical peers, and an expanded role for consultation liaison services into medical student teaching. New programs in holistic and behavioural medicine represented an emerging thrust particularly at the postgraduate level. Psychosomatic education should focus on specific training objectives acceptable to medical colleagues, educators and health planners.

Attitude of Health Personnel↗

Echocardiographic features of an unruptured aneurysm of the right sinus of Valsalva.

A 2-cm aneurysm of the right sinus of Valsalva was documented in a patient with a prosthetic aortic valve. The M-mode findings differed from prior reports and mimicked those of aortic root dissection or a catheter placed in the right ventricular outflow tract. Two-dimensional echocardiograms readily distinguished the aneurysm of the right sinus of Valsalva from the alternative possibilities.

Adult↗

Thalamic stimulation for neuropathic pain.

Eighteen patients with neuropathic pain underwent thalamic electrode implantation. Satisfactory initial pain relief ensued in 14, and their electrode systems were internalized for long-term use. Twelve of the 14 continue to obtain either complete or partial pain relief by regular stimulation. One of the other two patients has had a complete remission of pain, apparently spontaneously, and the other had to have the electrodes removed after it retracted from his thalamus on two occasions. The electrodes have been placed in the sensory nucleus of the thalamus where stimulation evokes paresthesias in the painful part of the body. Technical problems consisting of our inability to locate the target in two patients and our failure to fix the electrode adequately in one prevented us from employing the treatment in three patients. The fourth patient had temperature dysesthesia which was not altered during 2 weeks of stimulation.

Adult↗