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Biomedical subjects

E C Wright

Publications and source records attributed to E C Wright.

At least 37 records · Page 2Linked to original sources
PubMed1993

A multicenter randomized trial comparing two surfactants for the treatment of neonatal respiratory distress syndrome. National Institute of Child Health and Human Development Neonatal Research Network.

OBJECTIVE: To compare the efficacy of two surfactants, Exosurf Neonatal (Burroughs Wellcome Co.) and Survanta (Ross Laboratories), for the treatment of neonatal respiratory distress syndrome. DESIGN: Multicenter randomized trial. SETTING: Eleven tertiary care university neonatal intensive care units participating in the National Institute of Child Health and Human Development Neonatal Research Network. PATIENTS: Newborn infants (n = 617) weighing 501 to 1500 gm with respiratory distress syndrome who were receiving assisted ventilation with 30% oxygen or more within 6 hours of birth were enrolled between January 1991 and January 1992. INTERVENTIONS: Infants were randomly assigned to receive up to four intratracheal doses of either Exosurf Neonatal (n = 309) or Survanta (n = 308). MAIN OUTCOME MEASURES: The occurrence of death or bronchopulmonary dysplasia 28 days after birth and the average fraction of inspired oxygen (FIO2) and mean airway pressure (MAP) during the first 72 hours after treatment. RESULTS: Death or bronchopulmonary dysplasia occurred in 67% of the infants in the Exosurf group and 62% of those in the Survanta group (adjusted relative risk, 1.07; 95% confidence interval, 0.96 to 1.20). During the 72 hours after the first surfactant dose, the average FIO2 (+/- SEM) was 0.50 +/- 0.01 for Exosurf and 0.42 +/- 0.01 for Survanta (difference, 0.08; 95% confidence interval, 0.05 to 0.11); the average MAP (+/- SEM) was 7.64 +/- 0.21 cm H2O for Exosurf and 6.93 +/- 0.21 cm H2O for Survanta (difference, 0.71 cm H2O; 95% confidence interval, 0.13 to 1.29 cm H2O). There was no difference between the groups in the incidence of other neonatal morbidities or in the duration of hospitalization, assisted ventilation, or supplemental oxygen administration. CONCLUSION: We found no difference between treatment groups in the incidence of death or bronchopulmonary dysplasia, although we did observe a difference in the initial response to treatment as measured by FIO2 and MAP.

Biological Products↗
PubMed1993

Decreasing mortality associated with the introduction of surfactant therapy: an observational study of neonates weighing 601 to 1300 grams at birth. The Members of the National Institute of Child Health and Human Development Neonatal Research Network.

OBJECTIVE: To determine whether the introduction of surfactant therapy was associated with decreased mortality for high-risk preterm neonates weighing 601 to 1300 g at birth. DESIGN: Before-after observational study. SETTING: Eight tertiary care neonatal intensive care units participating in the National Institute of Child Health and Human Development Neonatal Research Network. PATIENTS: The outcomes for neonates with birth weight 601 to 1300 g admitted in the 2 years before surfactants became available (n = 2780) were compared with those of neonates admitted in the year beginning 2 months after surfactants became available (n = 1413). MAIN OUTCOME MEASURES: The primary outcome measure was in-hospital mortality; secondary outcome measures included durations of assisted ventilation, length of hospitalization, and neonatal morbidity. RESULTS: Forty percent of neonates in the postsurfactant group received surfactant (range 28% to 69% at the centers). Mortality decreased from 27.8% before to 19.9% after surfactant therapy was introduced (Mantel-Haenszel chi 2 = 31.4, P = .001). The adjusted odds ratio for mortality after surfactants became available was 0.73 (95% confidence interval 0.55 to 0.95). The duration of assisted ventilation and length of hospitalization increased after surfactants were introduced (P = .0001 for both outcomes). CONCLUSION: Mortality for neonates weighing 601 to 1300 g decreased after surfactant therapy was introduced, suggesting that the efficacy of surfactants demonstrated in randomized controlled trials will translate into effectiveness in routine clinical care.

Female↗
PubMed1992

Long-term mortality after transfusion-associated non-A, non-B hepatitis. The National Heart, Lung, and Blood Institute Study Group.

BACKGROUND: Acute non-A, non-B hepatitis after blood transfusion often progresses to chronic hepatitis and sometimes culminates in cirrhosis or even hepatocellular carcinoma. However, the frequency of these sequelae and their effects on mortality are not known. METHODS: We traced patients with transfusion-related non-A, non-B hepatitis who had been identified in five major prospective studies conducted in the United States between 1967 and 1980. We matched each patient with two control subjects (identified as the first and second controls) who received transfusions but who did not have hepatitis. The mortality rates in the three groups were determined with use of data from the National Death Index and Social Security Death Tapes. Cause-specific mortality was determined by reviewing death certificates. RESULTS: Vital status was established for over 94 percent of the 568 patients who had had non-A, non-B hepatitis and the two control groups (526 first controls and 458 second controls). After an average follow-up of 18 years, the estimate by life-table analysis of mortality from all causes was 51 percent for those with transfusion-associated non-A, non-B hepatitis, as compared with 52 percent for the first controls and 50 percent for the second controls. The survival curves for the three groups were virtually the same. Mortality related to liver disease was 3.3, 1.1, and 2.0 percent, respectively, among the three groups (P = 0.033 for the comparison of the group with non-A, non-B hepatitis with the combined control group). Seventy-one percent of the deaths related to liver disease occurred among patients with chronic alcoholism. CONCLUSIONS: In this long-term follow-up study, there was no increase in mortality from all causes after transfusion-associated non-A, non-B hepatitis, although there was a small but statistically significant increase in the number of deaths related to liver disease.

Alcoholism↗
PubMed1992

A controlled clinical trial of dichloroacetate for treatment of lactic acidosis in adults. The Dichloroacetate-Lactic Acidosis Study Group.

BACKGROUND: Mortality is very high in lactic acidosis, and there is no satisfactory treatment other than treatment of the underlying cause. Uncontrolled studies have suggested that dichloroacetate, which stimulates the oxidation of lactate to acetyl-coenzyme A and carbon dioxide, might reduce morbidity and improve survival among patients with this condition. METHODS: We conducted a placebo-controlled, randomized trial of intravenous sodium dichloroacetate therapy in 252 patients with lactic acidosis; 126 were assigned to receive dichloroacetate and 126 to receive placebo. The entry criteria included an arterial-blood lactate concentration of > or = 5.0 mmol per liter and either an arterial-blood pH of < or = 7.35 or a base deficit of > or = 6 mmol per liter. The mean (+/- SD) arterial-blood lactate concentrations before treatment were 11.6 +/- 7.0 mmol per liter in the dichloroacetate-treated patients and 10.4 +/- 5.5 mmol per liter in the placebo group, and the mean initial arterial-blood pH values were 7.24 +/- 0.12 and 7.24 +/- 0.13, respectively. Eighty-six percent of the patients required mechanical ventilation, and 74 percent required pressor agents, inotropic drugs, or both because of hypotension. RESULTS: The arterial-blood lactate concentration decreased 20 percent or more in 83 (66 percent) of the 126 patients who received dichloroacetate and 45 (36 percent) of the 126 patients who received placebo (P = 0.001). The arterial-blood pH also increased more in the dichloroacetate-treated patients (P = 0.005). The absolute magnitude of the differences was small, however, and they were not associated with improvement in hemodynamics or survival. Only 12 percent of the dichloroacetate-treated patients and 17 percent of the placebo patients survived to be discharged from the hospital. CONCLUSIONS: Dichloroacetate treatment of patients with severe lactic acidosis results in statistically significant but clinically unimportant changes in arterial-blood lactate concentrations and pH and fails to alter either hemodynamics or survival.

Acidosis, Lactic↗
PubMed1992

Vigabatrin in adults with poorly-controlled epilepsy and learning disabilities.

Twenty-two adult patients with uncontrolled epilepsy and severe learning difficulties were included in an open study of vigabatrin. Patients were all in residential care and had experienced at least 12 seizures during the previous 12 months despite all attempts to optimize antiepileptic drug (AED) treatment. Following a 4 month baseline period, vigabatrin 500 mg twice daily was added to the current AED treatment and the dose increased according to response, up to a maximum of 4 g/day. Ten patients achieved a reduction in seizure frequency of more than 50% during this 4 month dose titration phase. Two patients had no seizures during the baseline period. For the 30 patients with seizures during the baseline period the median improvement in seizure frequency with the addition of vigabatrin was 49% (P = 0.014). The response rate was higher for patients with partial seizures than for those with generalized seizures. Ten patients continued with vigabatrin while the dose of one of their other AEDs was gradually reduced and successfully withdrawn in three patients. Adverse events were reported in 20 patients during the 64 week study period. The most frequently reported events were sedation (8 patients), aggression (4 patients), agitation (3 patients) and ataxia (3 patients). No patients were withdrawn from the study as a consequence of adverse events. Vigabatrin was therefore an effective add-on therapy in 45% of these difficult-to-treat patients and allowed reduction of other AED treatment in a small number.

Adolescent↗
PubMed1990

Inheritance of proliferative breast disease in breast cancer kindreds.

Previous studies have emphasized that genetic susceptibility to breast cancer is rare and is expressed primarily as premenopausal breast cancer, bilateral breast cancer, or both. Proliferative breast disease (PBD) is a significant risk factor for the development of breast cancer and appears to be a precursor lesion. PBD and breast cancer were studied in 103 women from 20 kindreds that were selected for the presence of two first degree relatives with breast cancer and in 31 control women. Physical examination, screening mammography, and four-quadrant fine-needle breast aspirates were performed. Cytologic analysis of breast aspirates revealed PBD in 35% of clinically normal female first degree relatives of breast cancer cases and in 13% of controls. Genetic analysis suggests that genetic susceptibility causes both PBD and breast cancer in these kindreds. This study supports the hypothesis that this susceptibility is responsible for a considerable portion of breast cancer, including unilateral and postmenopausal breast cancer.

Adult↗
PubMed1990

A genetic map of human chromosome 17p.

A genetic linkage map was constructed with 18 loci from the short arm and pericentric region of chromosome 17 typed on the CEPH reference families. The genetic map includes three markers extracted from the CEPH public database. Nine loci could be ordered using a threshold of odds of at least 1000:1 against alternative orders during the map construction process. With a reduced tolerance of 100:1, a total of 13 loci could be placed on the map spanning a distance of approximately 60 cM in females and 46 cM in males. There were statistically significant differences between the male and the female genetic maps. The order inferred from the genetic data was consistent with the physical localizations of these probes obtained from somatic cell hybrids and tumor deletion studies. This map should be useful for genetic fine mapping of 17p loci.

Alleles↗
PubMed1990

Evidence against the reported linkage of the cutaneous melanoma-dysplastic nevus syndrome locus to chromosome Ip36.

The reported linkage between cutaneous melanoma and the dysplastic nevus syndrome (CM/DNS) to markers located on the distal portion of the short arm of chromosome 1 was examined in three Utah kindreds ascertained for multiple cases of melanoma. Family members in these kindreds were genotyped for the two markers reported to be most closely linked in the Bale study, PND and D1S47. Both melanoma alone and a combined melanoma/DNS phenotype were analyzed; no evidence for linkage was found. By multipoint linkage analysis the CM/DNS locus was excluded from an area of 55 cM containing the PND-D1S47 region. Diagnostic or genetic heterogeneity are alternate explanations for the discrepancy between our observations and those of Bale et al.

Chromosome Mapping↗
PubMed1989

The use of drugs for physical conditions in adults with mental retardation.

A survey of the drugs given for physical complaints in two mental handicap hospitals is described. Thirty-six per cent of 537 adults in hospital A and 43% of 944 adults in hospital B received medications and, of those who did, over half in each hospital received only one drug. The hospital populations differed significantly but both showed a significant increase in total drug usage with increasing age in both sexes, higher among females in every group. This increase was greatest with C.V.S. drug usage, but it did not reach significance for the three most frequently prescribed groups, which were gastrointestinal drugs (to 13% of the total patients), vitamins and nutritional supplements (11%), dermatological (10%) and cardiovascular (10%) drugs. Mental level was significantly indirectly related to usage of gastrointestinal drugs, drugs for anaemia, and vitamins and nutritional supplements, and directly to usage of cardiovascular drugs.

Adolescent↗
PubMed1989

Body weight in chronic obstructive pulmonary disease. The National Institutes of Health Intermittent Positive-Pressure Breathing Trial.

This study reviews the relationship between body weight, pulmonary function, and survival in the recent clinical trial of intermittent positive pressure breathing (IPPB). We related body weight, expressed as a percent of the ideal (%IBW), to the numerous other features of the disease recorded in this data set. Body weight was directly related to FEV1 (p = 0.0001), so that all subsequent analyses of body weight had to first consider FEV1. Mortality appeared to be influenced by body weight independent of FEV1. In patients with %FEV1 less than 35, mortality increased with decreasing body weight (p = 0.093), and this relationship was stronger in patients with %FEV1 35 to 47 (p = 0.048) and even stronger in patients with %FEV1 greater than 47 (p = 0.007). After adjusting for FEV1, body weight was a powerful positive correlate with exercise capacity (p = 0.0001). Body weight was also inversely related to %TLC (p = 0.0408) after adjusting for FEV1. Body weight was a powerful predictor of diffusing capacity (p = 0.0001) in patients with the same FEV1. These results support the hypothesis that factors related to nutritional status are an independent influence on the course of COPD.

Adult↗
PubMed1989

A preliminary study on the timeliness of ambulatory care utilization following medical self-care interventions.

A sub-sample, from a large prospective study examining the effects on utilization from the introduction of medical self-care materials, was followed to determine the timeliness of that utilization. Judgments on early, on time, or late visits, by patients, providers, and algorithms showed agreement for experimentals (n = 203) but not controls (n = 56). Comparisons on the rates of judged early, on time, and late visits differed between groups (by the physician and algorithm comparison), and further differed when comparing late only visits (by the algorithm comparison). The experimentals demonstrated a trend to delay care seeking though no adverse effect on health was identified when comparing subsequent illness days and hospitalizations. Medical self-care can reduce utilization and improve patients' ability to judge visit timeliness. Apparent trends to increase late visits may be an artifact of conservative judgments rendered by medical opinion.

Ambulatory Care↗
PubMed1988

The effect of self-care interventions on the use of medical service within a Medicare population.

To determine the effect of a self-care communication-based health education program on ambulatory care utilization, a prospective, randomized, controlled trial was conducted with a Medicare population within a health maintenance organization. A statistically significant decrease of 15% in total medical visits was found in the experimental group as compared with a control. Although not evident in the control, a statistically significant decrease in the ratio of follow-up visits from pre-entry to postentry was realized in the experimental group. Medical-visit decreases resulted in a savings of $36.65 per household in the experimental group for a benefit-cost ratio of 2.19 saved for every dollar spent on intervention. These results demonstrate that a health education program can reduce utilization while having no known negative impact on the quality of health.

Aged↗