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Biomedical subjects

P Roy

Publications and source records attributed to P Roy.

At least 343 records · Page 19Linked to original sources
PubMed1987

Primary renal artery dissection. Presentation of two cases and brief review of the literature.

Two cases of primary renal artery dissection in caucasian males, aged 40 and 37 years, respectively, are presented. In both subjects, the clinical picture disclosed renal infarction with transient deterioration of renal function, microhematuria and proteinuria. In 1 patient, a slight, temporary increase in blood pressure was also observed. Both men experienced contralateral relapse 12 days and 7 years, respectively, after the first episode. The diagnosis was based on characteristic (case 1) or suggestive (case 2) arteriographic findings. In 1 subject, control arteriography suggested some progression of the lesion. Both patients were treated conservatively. A comparison with 143 cases previously reported worldwide emphasizes some aspects of this 'not-so-rare' entity.

Adult↗
PubMed1987

Percutaneous transluminal coronary angioplasty in patients with silent myocardial ischemia during exercise testing.

Silent myocardial ischemia was present in 50 of 507 patients undergoing PTCA. Of these patients, five had type 1 (asymptomatic with no previous myocardial infarction), 27 had type 2 (asymptomatic after myocardial infarction) and 18 had type 3 silent myocardial ischemia (angina present in addition to silent episodes). Ischemia was documented in all patients in the exercise ECG, in 18 patients with thallium scintigraphy and in four with radionuclide ventriculography. The indication for PTCA was considered established in patients with type 1 silent ischemia based on ECG changes in the presence of high grade stenosis of the left anterior descending artery under the assumption of improved prognosis. The fact that patients with myocardial infarction have a poorer prognosis in the presence of ST-segment depression served as the basis for the indication for PTCA in type 2 patients. In type 3 patients, PTCA was carried out to ameliorate the symptomatic as well as asymptomatic episodes of ischemia. The follow-up period averaged 12 +/- 6 months. The primary rate of success was 92% with no differences between the groups. There were no complications in type 1 and type 2 patients; in two patients with type 3 silent ischemia, immediate bypass surgery was carried out due to acute occlusion of the dilated vessel. One patient in the latter group had myocardial infarction in the region perfused by the dilated vessel four months after the procedure. The angiographically-documented rate of restenosis was 33% in type 1 patients, 26% in type 2 and 40% in type 3 patients.(ABSTRACT TRUNCATED AT 250 WORDS)

Angioplasty, Balloon↗
PubMed1986

Atrial natriuretic factor induced phosphorylation of human placental membrane protein: an effect mimicked by guanosine 3':5'-cyclic monophosphate.

Atrial natriuretic factor (ANF) specifically stimulated the endogenous phosphorylation of a protein band in an isolated membrane fraction of human placenta. The apparent molecular weight of the substrate protein as determined by SDS-polyacrylamide gel electrophoresis is 160-170,000. In the same membrane fraction, ANF also stimulated guanylate cyclase activity in a dose-dependent manner. Guanosine 3':5'-cyclic monophosphate (cyclic GMP), added to the membrane fraction in lieu of ANF, also stimulated the phosphorylation of several protein bands, one of which have the same apparent molecular weight as the one stimulated by ANF. In contrast, adenosine 3':5'-cyclic monophosphate (cyclic AMP) at a similar concentration and hormones such as angiotensin II, insulin and vasopressin had no effect on the phosphorylation state of this protein band. The finding that ANF alters the phosphorylation state of a certain membrane protein and that this effect is mimicked by cyclic-GMP suggests that at least some of the biological action of ANF may be mediated by the phosphorylation of membrane protein involving a cyclic GMP-dependent protein kinase.

Angiotensin II↗
PubMed1986

Construction of a genomic library from germinating seedlings of mung bean (Vigna radiata). Evidence for the presence of a class of repetitive sequences and selection of beta-tubulin specific recombinant phage.

We have constructed a genomic library of Vigna radiata from its total DNA in the phage charon 4A. Recombinant phages were used to hybridize with a family of mung bean repetitive DNA. At least 30% of recombinant phages showed positive hybridization with a specific type of sequences. These phages were also used to screen for beta-tubulin-specific recombinants and a recombinant phage with beta-tubulin gene was identified.

Autoradiography↗
PubMed1986

Refashioning of phallus stumps and phalloplasty in the treatment of carcinoma of the penis.

The surgical management of 41 patients with carcinoma of the penis is presented. Conservative surgery in the form of a circumcision or a glansplasty was done in eight patients with one recurrence. Circumcision as an adequate procedure is advocated for lesions near the apex of the preputial sac permitting a 2 cm clearance; glansplasty after local excision requires further evaluation. The details of technique of lengthening and refashioning of the residual phallic stump after partial amputation in a further 20 patients is described using a technique which leaves a satisfactory penile stump in patients who would normally be candidates for a total amputation. In a third group of patients requiring a total amputation of penis, reconstruction was done in two stages using scrotal flaps in four with satisfactory results. The reconstructed phallus was adequate as a urinary conduit but was unsuitable for sexual function. A one stage procedure involving covering of the urethra with scrotal flaps appears an attractive alternative to the staged procedure. Conventional multistage reconstructions are not recommended.

Circumcision, Male↗
PubMed1986

Effect of glyceryl trinitrate on peripheral arteries alters left ventricular hydraulic load in man.

Effects of sublingual glyceryl trinitrate (GTN) were studied in ten patients without heart failure during diagnostic cardiac catheterisation following angiography. GTN caused substantial reduction in peak left ventricular and aortic pressure (19 mmHg) with lesser reduction in mean aortic pressure (9 mmHg) and no change in diastolic aortic pressure. Reduction in stroke volume (by 15%), associated with fall in left ventricular end diastolic pressure (by 4 mmHg) was insufficient to explain the marked (17 mmHg - 34%) reduction in pulse pressure. Decrease in pulse pressure was associated with loss of the late systolic peak on both the aortic and left ventricular pressure wave. This peak is caused by pulse wave reflection. GTN caused no change in peripheral resistance or in indices of aortic compliance (characteristic impedance, total arterial compliance) but was associated with reduction in fluctuations of both modulus and phase of aortic impedance. All these changes in pressure waves and in impedance spectra are explicable on the basis of decreased peripheral wave reflection. This can be attributed to the known vasodilatory effect of GTN on the peripheral arteries. Simulation of arterial vasodilatation in a multi-branched model of the systemic arterial system confirmed this interpretation. Dilatation of peripheral arteries explains in part the beneficial effects of GTN in adult man.

Adult↗
PubMed1986

Renal subcapsular rim sign. Radionuclide pattern.

The renal cortical rim sign is a radiological term describing the thin peripheral nephrogram of 2-4 mm thick which is from the peri-renal capsular collateral circulation in an otherwise nonfunctioning kidney. Radionuclides are used frequently in the estimation of renal function. A neonate with renal vein thrombosis demonstrated a rim sign on renal scan with Technetium DTPA. The rim sign on renal scan can be differentiated from severe hydronephrosis or multicystic kidney both of which may have a peripheral thin cortex which functions late on the renal scan. The rim sign in renal vein thrombosis was best visualized during the early blood pool phase when there was a considerable amount of radioactivity in the blood pool.

Humans↗
PubMed1986

Nucleotide sequence of a cDNA clone of RNA segment 10 of bluetongue virus (serotype 10).

The complete sequence of the double-stranded RNA segment that codes for a non-structural protein (P8) of bluetongue virus serotype 10 has been determined from a cDNA clone inserted into the plasmid pBR322. The segment 10 RNA of the virus (S10 RNA) is deduced to be 822 base pairs long (0.5 X 10(6) daltons) and has an open reading frame in one strand capable of coding for a protein with a calculated size of 25,572 daltons (229 amino acids) and a net charge of +5.5 at neutral pH.

Amino Acids↗
PubMed1986

Nucleotide sequence of cDNA clones encoding the outer capsid protein, VP5, of bluetongue virus serotype 10.

The complete sequence of the RNA segment that codes for a major outer capsid protein (VP5) of bluetongue virus serotype 10 has been determined from overlapping cDNA clones inserted into pBR322. The segment 5 RNA of the virus (M5 RNA) is deduced to be 1638 base pairs long (1.05 X 10(6) daltons) and has an open reading frame in one strand capable of coding for a protein with a calculated size of 59 163 daltons (526 amino acids) and a net charge of -4.5 at neutral pH.

Amino Acids↗
PubMed1986

Prenatal screening.

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Congenital Abnormalities↗
PubMed1986

Molecular and genetic comparisons of two serotypes of epizootic hemorrhagic disease of deer virus.

The virus-specific double-stranded genome RNA of 2 serotypes of epizootic hemorrhagic disease of deer virus (EHDV) was evaluated by use of coelectrophoresis in polyacrylamide and agarose gel systems. The molecular weights of virion RNA segments were 0.32 to 2.57 X 10(6) for EHDV-1 and 0.33 to 2.54 X 10(6) for EHDV-2. Seven of 10 double-stranded RNA segments of the 2 serotypes had different electrophoretic mobilities in the polyacrylamide-gel electrophoresis system. Although the individual RNA segments of each serotype contained unique RNA sequences determined on the basis of 2-dimensional polyacrylamide-gel electrophoresis analysis of oligonucleotides, the corresponding segments of the 2 serotypes were found to be comparable and at least 1 pair of RNA segment was almost identical. Virus-specific polypeptides for the 2 serotypes were compared by use of gel electrophoresis. Eleven polypeptides were detected for EHDV-1 and 10 for EHDV-2. Six corresponding polypeptides of these 2 serotypes had different electrophoretic mobilities, indicating that these corresponding polypeptides differ in their molecular weights. A genetic relationship was not determined between the 2 EHDV serogroups and the blue-tongue serogroup viruses, using oligonucleotides mapping.

Animals↗