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Biomedical subjects

C W Goodwin

Publications and source records attributed to C W Goodwin.

At least 19 recordsLinked to original sources
PubMed1992

Mitochondrial glutathione in hypermetabolic rats following burn injury and thyroid hormone administration: evidence of a selective effect on brain glutathione by burn injury.

Cerebral cortex, heart, skeletal muscle, and liver mitochondrial glutathione (GSH) levels in severely burned rats are decreased to between approximately 50% to 70% of sham-operated, normally fed controls. In semistarved rats, weight-matched with burned rats, mitochondrial GSH levels in these tissues are decreased to between approximately 70% to 91% of those in sham-operated rats. Total GSH levels in peripheral tissues and brain are decreased to approximately 60% to 65% of control levels in rats with burn injury and food restriction, suggesting a higher mitochondrial GSH turnover in burned rats than in semistarved rats, probably because of higher "stress hormone" levels in burned rats than in semistarved rats. Cerebral cortex mitochondrial GSH levels are unaffected by variations in thyroid hormone status, but liver mitochondrial GSH levels are decreased by triiodothyronine and increased by propylthiouracil. The present results suggest that mitochondrial GSH is not only regulated by the rate of GSH synthesis in the cytosol, but seems to be under hormonal influence as well; stress hormones and triiodothyronine may decrease mitochondrial GSH by increasing mitochondrial oxygen consumption with increased reactive oxygen species formation or by increasing GSH exchange between mitochondria and the cytosol. These findings may be of importance therapeutically in increasing antioxidative defenses to limit oxidative stress injury in hypermetabolic patients.

Animals↗
PubMed1992

Pediatric burns. An overview.

This article describes the management of burn injuries in children. It begins with an epidemiologic description of pediatric burns. Attention is given to emergency care, burn wound evaluation, operative management, and rehabilitative goals.

Burns↗
PubMed1992

Detection of alcoholism among burn patients.

To determine the prevalence of alcoholism among patients at a large inpatient burn center, a semistructured interview for diagnosing alcoholism--the CAGE questionnaire--was administered. Of 124 patients interviewed, 24 (19 percent) were found to have an alcohol problem based on responses to the CAGE questionnaire. However, when patients' charts were reviewed at discharge, only seven of the 24 subjects were described as having an alcohol-related problem. Of the 22 subjects whose alcoholism was detected by the CAGE questionnaire and for whom blood alcohol screens had been obtained on admission, only seven had a positive screen. About 70 percent of the patients with alcoholism were missed by blood alcohol screens on admission and by the usual procedures for gathering patient information on admission and during hospitalization. The study found that use of the CAGE questionnaire greatly increased the detection of alcoholism in burn patients.

Adolescent↗
PubMed1992

Resuscitation of the thermally injured patient.

This article briefly reviews the pathophysiology of burn wounds as a basis for a more detailed discussion on the resuscitation of burn patients with lactated Ringer's solution or other regimens. The complications resulting from such resuscitation are also reviewed.

Burns↗
PubMed1989

Drug-induced toxic epidermal necrolysis in children.

Nine pediatric patients with drug-induced toxic epidermal necrolysis were treated with a regimen of basic burn care and without the use of steroids or topical or systemic antimicrobial agents. Although septic complications continue to occur frequently, infections are better tolerated when potential iatrogenic sources of decreased host resistance, such as steroids, are eliminated. Neutropenia, gram-negative sepsis, and mortality were all greatly reduced with this regimen, while healing was neither impaired nor prolonged. Thus, steroids and sulfa-containing topical agents should be avoided in the treatment of this disorder.

Adolescent↗
PubMed1989

Tracheostomies in burn patients.

The use of tracheostomies in burned patients with inhalation injuries is now reserved for specific indications rather than as prophylactic airway management. A 5-year burn center experience with tracheostomies used in this fashion is presented. Ninety-nine tracheostomies were performed in 3246 patients who had indications of prolonged respiratory failure or acute loss of airway. Although colonization of the sputum was universal, neither rates of pulmonary sepsis nor mortality were significantly increased in patients who underwent tracheostomies. Twenty-eight patients developed late upper airway sequelae, including tracheal stenosis (TS), tracheoesophageal fistula (TEF), and tracheoarterial fistula (TAF). Duration of intubation correlated only with development of TAF, whereas patients in whom TEF developed were significantly older and more likely to have evidence of tracheal necrosis at the time of tracheostomy. The pathogenesis of upper airway sequelae in these patients as divergent responses to the combined insults of inhalation injury, infection, and intubation is considered.

Burns↗
PubMed1989

Occult diaphragmatic injury from stab wounds to the lower chest and abdomen.

Ninety-five patients with stab wounds to the lower chest and abdomen underwent routine abdominal exploration. Eighteen of these patients had diaphragmatic injury and in five patients it was the only injury found. Isolated diaphragmatic injury in asymptomatic patients cannot be reliably delineated by either serial physical examination or peritoneal lavage. Delayed recognition of incarcerated diaphragmatic hernia after stab wounds to the lower left chest and upper abdomen has an associated mortality rate of 36%. The anatomic area of concern can be defined as stab wounds that penetrate the left side of the chest below the fourth intercostal space anteriorly, the sixth intercostal space laterally, and the tip of the scapula posteriorly. Exploratory laparotomy is necessary in these patients until a reliable nonoperative method is established that can exclude injuries to the diaphragm.

Abdominal Injuries↗
PubMed1989

Comparison of an occlusive and a semi-occlusive dressing and the effect of the wound exudate upon keratinocyte proliferation.

Three consecutive studies were performed in 58 patients evaluating the effect of occlusion on the healing of partial-thickness wounds. Mirror-image donor sites were covered with the occlusive hydrocolloid dressing (HCD) (DuoDerm) and compared to fine mesh gauze, and the HCD was subsequently compared to a semi-occlusive dressing of polyurethane film, (Op-site). In addition, partial-thickness burn wounds were covered with the HCD and the remaining burn wound was treated with silver sulfadiazine. The donor sites and burn wounds treated with HCD healed significantly faster than those covered with fine mesh gauze or silver sulfadiazine (p less than 0.001) and with less pain. The HCD and polyurethane film were equivalent. There were no clinical infections with the wounds that were occluded. The exudate collected beneath the DuoDerm and Op-site on donor sites was added to the tissue culture system and resulted in a modest increase in keratinocyte proliferation. However, the exudate from burn wounds under HCD resulted in a marked increase in cell proliferation (p less than 0.001).

Adolescent↗
PubMed1986

Evaluation of (1-sarcosine, 8-isoleucine) angiotensin II as a therapeutic agent for oleic acid-induced pulmonary edema.

(1-Sarcosine, 8-isoleucine) angiotensin II was assessed as a therapeutic agent for acute respiratory distress syndrome with oleic acid pulmonary edema in sheep used as an experimental model. Under general anesthesia with controlled mechanical ventilation with 100% oxygen, 32 sheep received oleic acid (0.075 ml/kg) intravenously. After oleic acid infusion, 20 animals were treated with continuous intravenous infusion of the angiotensin II analogue; nine received 300 ng/kg/min, six received 600 ng/kg/min, and five received 2000 ng/kg/min. Cardiopulmonary measurements were repeated every 30 minutes for 270 minutes. According to time-integrated PaO2, six of 15 animals of the groups given 300 and 600 ng/kg/min (43%) did not respond to the treatment. All animals responded in the group given 2000 ng/kg/min. Animals in the latter group had lower Qs/Qt, PaCO2, and airway resistance than had the control animals. Elevation of pulmonary vascular resistance was limited and mean arterial blood pressure was well maintained. These results reveal that (1-Sar, 8-Ile) angiotensin II is effective in the treatment of oleic acid-induced pulmonary edema.

1-Sarcosine-8-Isoleucine Angiotensin II↗
PubMed1977

Effects of chronic hypoxia on canine gastric secretion.

Interdigestive gastirc acid output and acid secretory response to histamine, insulin and pentagastrin were studied in five dogs before and after creation of a right to left extracardiac vascular shunt. The arterial PO2 decreased from 81.5 +/- 5.5 mm Hg to 39.8 +/- 6.0 mm Hg postoperatively with no change in arterial pH or PaCO2. Basal (interdigestive) acid output increased from 1.19 +/- 0.26 mEq/hr to 4.97 +/- 0.81 mEq/hr postoperatively. Acid secretory response to insulin was increased after the induction of chronic hypoxia. Increased sensitivity to pentagastric was also observed although parietal cell mass (maximum histamine-stimulated output) was unchanged postoperatively. Changes in acid secretory response and PaO2 were present at one week and were sustained through twelve weeks after shunting. Chronic hypoxia resulted in gastric acid hypersecretion secondary to enhanced sensitivity of the parietal cell to a combination of neural and humoral stimuli.

Animals↗
PubMed1976

In vivo control of mitochondrial enzyme concentrations and activity by oxygen.

Newborn and adult dog heart mitochondria were prepared from animals chronically adjusted to varying arterial oxygen tensions. Similarly, rat liver and heart mitochondria were isolated from animals acutely exposed to lowered inspired oxygen. After isolation, all mitochondrial samples were assayed under normoxic conditions. These experiments illustrated the following effects of oxygen on mitochondrial function: 1) respiratory activity in State 3 or in the uncoupled state increased after hypoxia and decreased after increased in vivo oxygenation; 2) similarly, the turnover of cytochrome oxidase increased in hypoxia and decreased after increased oxygenation; 3) after chronic hypoxia cytochrome oxidase, cytochrome c and b concentrations decreased per miligram of mitochondrial protein; 4) all mitochondrial preparations were well coupled and exhibited normal capabilities to perform oxidative phosphorylation. The data are interpreted to indicate sensitive control of mitochondrial respiratory capacities by oxygen in vivo.

Acid Phosphatase↗
PubMed1976

Fracture healing in the presence of chronic hypoxia.

Recent studies have demonstrated that fracture healing normally takes place under hypoxic conditions. The present study evaluated the effect of a state of chronic systemic hypoxia on fracture healing in dogs. A significant delay in fracture healing was demonstrated in the hypoxic animals roentgenographically, histologically, and by strength-testing criteria. A further reduction in the available oxygen supply below that present during normal repair had an adverse effect on fracture healing.

Animals↗