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Biomedical subjects

S R Karl

Publications and source records attributed to S R Karl.

10 recordsLinked to original sources
PubMed1993

Feeding Roux-en-Y jejunostomy in the management of severely neurologically impaired children.

Feeding problems are legion in severely neurologically impaired children. Many patients do well with a gastrostomy with or without fundoplication. Unfortunately, fundoplication is not without complication, emphasizing the need for other options in the management of these difficult patients. Since 1990 six patients (age range, 2 months to 6 years) have been treated by the creation of a permanent Roux-en-Y end-jejunostomy and a gastrostomy. The Roux limb is closed tightly around a mushroom catheter. The gastrostomy is left for gastric decompression, and the jejunostomy tube is used for all nutrition and most medications. One patient died in the postoperative period. All the others have done well, without significant complication and with a high level of parent satisfaction (average follow-up, 12 months). Previously four other patients were treated with a Roux-en-Y jejunostomy in which, rather than closing the Roux limb around the catheter, it was brought out as a catheterizable stoma. Frequent leakage and prolapse make this approach less desirable.

Anastomosis, Roux-en-Y↗
PubMed1991

Mechanically induced pendelluft flow in a model airway bifurcation during high frequency oscillation.

A single bifurcation with adjustable branch compliances, resistances and inertances was used to study the generation of pendelluft flows during ventilation at tidal volumes of 5-15 ml and frequencies of 6-26 Hz, corresponding to parent branch Reynolds numbers of 400-8000 and Womersley parameter values of 12-25. Pendelluft was quantified by the ratio of tidal volume sum in sibling branches to tidal volume in the parent branch. This tidal volume fraction being greater than one in all experiments where an asymmetry in branch mechanics was imposed, indicated that some degree of pendelluft was always present. Asymmetries in compliance and in inertance produced much greater pendelluft than an asymmetry in resistance. The largest tidal volume fraction, equal to 2.75, was recorded when inertance in both sibling branches was high, resistance was low, and compliances differed by a factor of five. Tidal volume fraction always peaked at an optimal frequency between 12-24 Hz, similar to the frequencies at which physiologic transport optima have previously been observed.

Airway Resistance↗
PubMed1990

Hepatic granulomata. Presenting with prolonged fever. Resolution with anti-inflammatory treatment.

A patient is described who presented with a 1-month history of daily fever to 38.8 degrees C. There was no sign of joint pain or swelling and no skin rash. The patient had impressive hepatomegaly without splenomegaly. The only abnormal laboratory test was a sedimentation rate of 120 mm/hr. Ultrasound examination showed hypoechoic foci throughout the liver. These foci were confirmed by CT scan, which showed multiple well-marginated lesions of decreased attenuation and variable size throughout the right and left lobes of the liver. A liver biopsy specimen showed large nodules that were yellow and gritty in texture. Microscopic examination of biopsy specimens of these nodules showed extensive areas of necrotizing granulomatous inflammation with palisading histiocytes and occasional giant cells surrounded by necrotic foci. There was an associated fibroinflammatory infiltrate. The patient was treated with a nonsteroidal anti-inflammatory agent with prompt cessation of fever. A repeat CT examination of the liver after 14 months of treatment showed only mild hepatomegaly and a normal liver parenchyma. The focal lesions had disappeared. This is a case of hepatic granulomata in a child showing features of necrotizing inflammation.

Child↗
PubMed1988

Postoperative necrotizing fasciitis in children.

Necrotizing fasciitis is a rapidly progressive soft tissue infection, involving the skin, subcutaneous tissue, and superficial fascia. It is a rare but life-threatening complication in the postoperative patient. In the last 7 years, we have treated four children in whom necrotizing fasciitis developed after appendectomy for ruptured appendix, bilateral inguinal herniorrhaphy, or gastrostomy closure. These four patients and seven well-described children from the literature with necrotizing fasciitis following surgery form the basis of this review. The ages ranged from six days to 15 years (mean 4.5 years). There were eight boys and three girls. There were five clean, five clean-contaminated, and one contaminated surgical procedures. No patient had evidence of malignancy or diabetes. Two of our four patients had evidence of failure to thrive. Only one patient had an intraabdominal abscess. In ten, the infection started in the abdominal wall; in one, the infection started in the chest wall. In our four patients, three had neutropenia and fever, four had tachycardia, and two had wound crepitation and radiographic evidence of subcutaneous gas. Cultures of all ten wounds were positive for bacteria; six were positive for more than one organism. Blood culture results were positive in five of five patients who died and in only two of five patients who survived. All survivors had wide surgical debridement and were treated with broad-spectrum antibiotics. The mortality rate was 45% in the whole series.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1985

Juvenile secretory carcinoma of the breast.

Juvenile secretory carcinoma of the breast, a rare tumor in infants and children, has an unusual histological appearance and clinical behavior. Isolated case reports and small series have appeared since this lesion was first described by McDivitt and Stewart in 1966. Our case of a 3-year-old boy with axillary metastasis and 17 cases in children, from the literature, provide the basis of this review. Of the 18 patients, there were three boys and 15 girls. Their ages ranged from 3 to 17 years (mean 9.8 years). All patients presented with an asymptomatic mass in the breast. None had nodes which were clinically involved. Eight patients had excisional biopsy only. Two patients had quadrantectomy. Four had simple mastectomy; one of whom received postoperative axillary irradiation, and one of whom had axillary nodal sampling (our patient). One patient had a modified radical mastectomy and three had radical mastectomy. Two of eight children who had excisional biopsy alone developed local recurrences. In the first patient, the recurrences occurred at 2 and 8 years following initial therapy. In the second, they occurred at 4 and 21 years. Axillary nodal metastases were found in three of the six patients in whom nodal biopsies were performed. In only one patient were estrogen receptors measured and they were negative. No deaths have been reported in children during a follow-up period ranging from 0 to 22 years (mean 6.5 years). Secretory carcinoma of the breast in this group of patients appears to be a slow growing, locally recurring malignancy. Adults with histologically similar tumors also have a good prognosis. Excisional biopsy is probably inadequate therapy.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1985

Posterior mediastinal teratomas.

Eight benign posterior mediastinal teratomas have been found in the world's literature. Including our case, four teratomas were intimately involved with, and often required, partial resection of the major surrounding structures--aorta, chest wall, and esophagus. Preoperative evaluation of posterior mediastinal teratomas should include consideration of a barium swallow and/or aortography to rule out significant local involvement.

Esophagus↗
PubMed1983

High-frequency ventilation at rates of 375 to 1800 cycles per minute in four neonates with congenital diaphragmatic hernia.

Neonates with congenital diaphragmatic hernias (CDH) often die because of pulmonary hypoplasia and high pulmonary vascular resistance (PVR). Pulmonary hypertension and right-to-left shunting precedes progressive hypoxia and death. PVR is increased by acidosis and by high airway pressures. High-frequency oscillation (HFO) is a new technique which may improve the outcome for such infants. Gas exchange in HFO is achieved by directing rapid pulsations of small volumes of gas down the trachea, typically at rates greater than 200 cycles per minute, volumes less than 25% of dead space, and low airway pressures. Gas transport results from augmented diffusion, not from bulk flow. Four neonates with CDH deteriorated on conventional mechanical ventilation and required hand ventilation at rates above 200 per minute. HFO at frequencies from 375 to 1800 cycles per minute was then initiated using a flow-interrupter type of oscillator. A marked fall in PaCO2 and a rise in pH resulted. The elimination of CO2 was very efficient with low mean airway pressures (less than 15 mm Hg). The initial improvement during HFO probably resulted from a decrease in PVR due to reversal of the acidosis. However, all four babies died after 13 to 80 hours of HFO. Neonates with CDH who remain hypercapneic despite conventional mechanical ventilation can be successfully ventilated by HFO. Use of HFO produces respiratory alkalosis which may stabilize PVR in the normal range and improve survival rate.

Female↗
PubMed1983

Severe iron poisoning treated with enteral and intravenous deferoxamine.

An 18-month-old boy ingested approximately 18 g FeSO4, equivalent to 336 mg/kg elemental Fe. He rapidly developed severe gastroenteric symptoms, obtundation, and transient hypotension. The serum iron level two hours after ingestion was 6,798 micrograms/dL. He was treated with deferoxamine intravenously, enterally, and as a lavage solution. His hospital course was notable for lack of severe neurologic, hepatic, metabolic, or cardiovascular complications acutely with apparent complete recovery, although he returned six weeks after ingestion with intestinal obstruction due to a jejunal stricture.

Deferoxamine↗