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Biomedical subjects

G M Henry

Publications and source records attributed to G M Henry.

10 recordsLinked to original sources

The radiologist says malrotation: does the surgeon operate?

The management of malrotation when it is an incidental finding is unclear. This retrospective study reports an analysis of radiological and operative findings in a series of 71 patients. There were no deaths. We report a false-positive rate of 15% for upper gastrointestinal contrast studies reported as showing malrotation. Our findings and a review of the literature demonstrate that in the asymptomatic child over 2 years of age, the evidence supporting mandatory correction of malrotation is weak.

Child, Preschool↗

Portosystemic shunting for paediatric portal hypertension.

The records of 22 patients who received portosystemic shunting for portal hypertension from 1985 to 1995 inclusive at the Royal Alexandra Hospital for Children (RAHC) were retrospectively reviewed. There were 11 girls and 11 boys. The average age at operation was 8 years, 3 months (range, 2 years, 3 months to 16 years, 7 months). The aetiology was idiopathic portal cavernomatous transformation (n = 9), billiary atresia (n = 4), cystic fibrosis (n = 3), documented neonatal portal vein thrombosis (n = 3), congenital hepatic fibrosis (n = 2), and portal vein obstruction after liver transplant (n = 1). The major presenting problem was upper gastrointestinal haemorrhage. Two patients had recurrent melaena from Roux-en-Y jejunal loop and caecal varices, respectively. Before receiving shunts, 12 patients had endoscopic sclerotherapy, 1 had gastric transection, and 2 had gastric varices oversewn. Portal pressure at preoperative splenoportogram averaged 28 mm Hg (range, 20 to 41). Urgent shunts were performed on 13 patients. Two disadvantaged patients had prophylactic shunts for severe hypersplenism. The types of shunts used were reversed splenorenal (n = 13), splenoadrenal (n = 6), inferior mesenteric renal (n = 1), portocaval (n = 1), inferior mesenteric caval (n = 1), and superior and inferior mesenteric caval (n = 1). In all, 22 patients had 23 shunts. The patency rate was 96% on 6 months to 10 years follow-up (average, 5.8 years). No spleen was lost. There were 2 late deaths. Two cystic fibrosis patients and one child with extrahepatic portal hypertension experienced post-shunt encephalopathy. Three patients rebled in the early postoperative period despite a patent shunt. Two patients subsequently received liver transplantation without any additional difficulties. Thus, portosystemic shunting using a method appropriate for the patient is a reliable option for treating children with portal hypertension in whom variceal sclerotherapy is inappropriate or has failed.

Adolescent↗

A laboratory investigation of stain removal from enamel surface: comparative efficacy of three electric toothbrushes.

PURPOSE: To evaluate in a controlled laboratory investigation the efficacy of three electric toothbrushes with respect to removal of extrinsic dental stain from labial enamel surfaces of bovine permanent central incisors. MATERIALS AND METHODS: Enamel specimens were treated to produce a uniformly stained pellicle film. Staining was assessed photometrically, before and after brushing 16 specimens per group for 4.5 minutes with either the Braun Oral-B Plaque Remover (D7), the Braun Oral-B Ultra Plaque Remover (D9) or a high frequency electric toothbrush. A manual brush with the ADA reference abrasive was used as a positive control, and this was compared with the three electric toothbrushes, using a dentifrice slurry prepared from Crest toothpaste. Tension on the enamel specimens was set at 150 g, except for the high frequency toothbrush which was set at the manufacturer's recommended tension of 50 g. Stain removal was expressed as a cleaning ratio (CR), where larger values represented greater removal of stained pellicle. RESULTS: Compared with the ADA control (CR = 100), the D9 was the most effective (CR = 98) removing significantly more stain (P < 0.05) than the D7 (CR = 74). The high frequency toothbrush was found to be the least effective (CR = 48), removing significantly less stain than any of the other toothbrushes (P < 0.05).

Analysis of Variance↗

Method failures of laparoscopic tubal sterilization in a residency training program. A comparison of the tubal ring and spring-loaded clip.

A prospective, randomized study of 365 women undergoing interval laparoscopic tubal sterilization in a residency training program was undertaken to compare method failures. Two occlusive techniques were compared, the spring-loaded clip (Hulka-Clemens) and the tubal ring (Falope Ring). Patients were randomized to either Falope Rings or Hulka-Clemens clips as the primary method. Demographic characteristics, educational level and operator experience were similar in the two groups. Follow-up at an average of 16 months (range, 6-24) revealed eight pregnancies (4.5%) in 176 women in the clip group and five pregnancies (2.6%) in the ring group. The Hulka-Clemens clip and the Falope Ring have similar incidences of method failure when employed by inexperienced operators. We question the usefulness of chromopertubation utilizing methylene blue dye to ensure proper placement of the occlusive device.

Adult↗

Crystallographic studies on L-asparaginase from Proteus vulgaris. II. Symmetry and location of the tetrameric molecule.

Analyses of the x-ray diffraction intensity data by the Patterson synthesis and rotation function techniques show that the true space group of the monoclinic crystals of L-asparaginase (L-asparagine amidohydrolase, EC 3.5.1.1) from Proteus vulgaris is P21, that the molecular centers lie at x = 0.054, y = 0, z = 0.256, and its symmetry related positions, and that the tetramer molecules possess three approximate, mutually perpendicular 2-fold rotational symmetries, the axes of which run along the directions of the crystallographic a*-, b-, and c-axes. In addition, an investigation of the molecular packing arrangement in the crystal indicates that the tetramer molecules possess an approximately regular tetrahedral subunit structure.

Asparaginase↗

Intravenous l-DOPA plus carbidopa in depressed patients: average evoked response, learning, and behavioral changes.

The peripheral decarboxylase inhibitor carbidopa (L-alphamethyl-dopa-hydrazine) allowed safe intravenous administration of L-DOPA in amounts sufficient to alter cortical average evoked response (AER) and learning function in 13 depressed patients. The apparently rapid conversion of L-DOPA to dopamine, as reported from studies in animals, is consistent with the 20-30 min onset of effects seen in our study. Unipolar and bipolar depressed patients responded differently to the alterations in brain biogenic amines and also to the nonspecific stress of the experiment. Intravenous L-DOPA given acutely had effects on the AER that were similar to those documented with oral dopa given chronically--an augmentation of amplitude--intensity slopes in unipolar patients and a relative reduction of slopes in bipolar patients. In contrast, intravenous L-DOPA did not enhance verbal learning as did chronic oral treatment, but rather was associated with reduced learning compared with placebo infusions. Different neurochemical changes following L-DOPA given in single intravenous doses may be responsible for the different learning and behavioral changes form those found previously with oral dopa administered chronically.

Administration, Oral↗