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Biomedical subjects

W H Fleming

Publications and source records attributed to W H Fleming.

At least 73 records · Page 4Linked to original sources
PubMed1978

Fourteen years of implanted pacemakers in children.

Twenty-six children who had permanent pacemakers implanted at 6 hours to 11 years of age have been followed for up to 163 months. There were 14 children with surgical heart block, 9 with congenital heart block, 2 with postcatheterization complete heart block, and 1 with bradytachydysrhythmia syndrome. Eighteen of the 26 patients (69%) are still being paced with their original electrodes, some for more than eight years. Sixty pulse generators lasted an average of 17 months (range, 1 to 55 months). Five of the 26 patients (19%) are dead. Three died of noncorrectable heart disease, but there were 2 sudden unexplained deaths at home, both apparently due to sudden arrhtthmias. Both of these patients had received fixed-rate pulse generators, and 1 had a known potential for competing rhythms. The current optimal choices of equipment and techniques, including the role of synchronized, demand, lithium-powered, and nuclear-powered pulse generators, are discussed.

Age Factors↗
PubMed1977

New culture medium for the presumptive identificaion of Candida albicans and Cryptococcus neoformans.

A new medium composed of Tween 80, oxgall, caffeic acid, and Davis agar (TOC) that provides for the rapid presumptive identification of Candida albicans and Cryptococcus neoformans is described herein. C. albicans is differentiated from other yeasts by the sequential production of germ tubes and chlamydospores. In a comparison with cormeal agar control plates, there was an increase of chlamydospore-forming strains of C. albicans (97.1% versus 87.2%) and a decrease in the time required for chlamydospore formation (24 h versus 48 h). C. neoformans produced a brown pigment of TOC, which is specific for its identification, thus differentiating it from the other yeasts. A comparison of 24-h pigment production by C. neoformans on TOC with that of birdseed agar showed a dark, coffee brown color in the former cultures and a light brown color in the latter. The change in pigmentation of C. neoformans, as well as morphological changes in C. albicans, can be induced within 3 to 12 h and in not more than 24 h on the TOC medium.

Agar↗
PubMed1977

Kindness pays dividends: the medical benefits of intercostal nerve block following thoracotomy.

Postoperative pain is an important factor in the management of children undergoing thoracotomy. Intercostal nerve block has been used in adult patients, but its applicability in the pediatric age group has not been previously evaluated. Eighty-nine children (85 girls and 31 boys) aged 6 months to 16 years (mean age 4.7 years) underwent ligation of a patent ductus arteriosus (PDA) through a left thoracotomy. Twenty-nine children received intercostal blocks with bupivacaine from the level of the second to sixth thoracic vertebrae. Sixty cases constituted the control group. The patients with intercostal block had fewer doses of pain medication postoperatively, 2.7 mean (0 to 9), than did the control patients, 3.9 mean (0 to 21). The mean hospital stay was shortened in the patients with nerve block, 5.1 days versus 7.3 days for the control group. No ill effects of bupivacaine were noted. We conclude that intercostal nerve block is a valuable procedure reducing the need for postoperative analgesia and shortening hospital stay.

Adolescent↗
PubMed1976

The embryology and management of vascular rings.

Among 34 patients with vascular rings, symptoms of tracheal and esophageal compression or both occurred during the first six months of life in 24 (71%). Diagnosis was made in all cases on either plain x-ray film or esophagogram, and was confirmed by operation or angiogram. Associated defects were numerous, with ventricular septal defect (5) and Down's syndrome (3) most common. Operative intervention was required in 18 cases (53%), including 12 of the 14 double arches. Only one of the ten patients with symptomatic recurrent subclavian artery underwent operation. Fourteen of the 18 patients operated upon had early total relief of symptoms, and 17 had excellent late results. A simple system for describing the embryology of vascular rings is presented, and the embryologic relationship between vascular rings and interrupted aortic arches is described. Because of frequent delay in recognition of vascular rings and other surgically correctable lesions, the work-up of every child with two or more episodes of pneumonia should include barium swallow.

Adolescent↗
PubMed1976

Acute cardiac herniation following pneumonectomy.

Pneumonectomy with partial pericardiectomy may result in herniation of the heart through the pericardial defect, leading to cardiovascular collapse and death. Awareness of this grave potential complication and familarity with its clinical and roentgenographic features should permit prompt diagnosis and facilitate lifesaving repeat thoracotomy.

Acute Disease↗
PubMed1975

Balanced drainage of the contaminated pneumonectomy space.

The patient who needs a pneumonectomy but has an infected pleural cavity faces the probability of an empyema of the pneumonectomy space. Balanced drainage of a contaminated space may avoid this very serious complication. A patient with obstructing bronchogenic carcinoma associated with distal parenchymal suppuration and empyema is discussed. A pneumonectomy with balanced drainage of the pleural space was performed. After three weeks the mediastinum was stable, and daily irrigation of the space with antibiotic solution was begun. Following foourteen days of irrigation, the cavity was filled with antibiotic solution and closed. Follow-up has shown no subsequent space problems or infection. Balanced drainage is a useful method of dealing with a contaminated pneumonectomy space.

Carcinoma, Bronchogenic↗
PubMed1975

Echocardiographic identification of a pericardial cyst.

The echocardiogram of a woman with an anterior mediastinal mass showed an echo-free space between the chest wall and the right ventricle. The interface of mass with pericardium was outlined by a narrow echo. These findings suggested a homogeneous fluid-filled, thin-walled sac. Postoperation, echocardiography was normal.

Aged↗
PubMed1974

Increased oxyhemoglobin affinity after transfusion of stored blood: evidence for circulatory compensation.

The effect of change in red cell 2,3-diphosphoglycerate concentration after transfusion of ACD stored blood on arteriovenous oxygen content difference, arteriovenous oxygen tension difference and oxygen consumption was assessed in 15 injured patients in Vietnam. A significant increase in the arteriovenous oxygen tension difference and oxygen consumption was observed at the time of low 2,3-DPG. Change in 2,3-DPG did not correlate, however, with change in either arteriovenous oxygen content difference or venous PO(2). This study suggests that alterations in oxyhemoglobin affinity are effectively compensated, possibly by opening capillaries to increase blood flow to tissues, by reducing the capillary-tissue oxygen gradient to maintain the rate of tissue oxygen extraction, or by increasing cardiac output.

Adult↗