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Biomedical subjects

R Yogev

Publications and source records attributed to R Yogev.

At least 163 records · Page 9Linked to original sources

Neurosurgical shunt infections. A review.

Shunt infections occur in 6-25% of hydrocephalic patients with shunts. Although Staphylococcus epidermidis and Staphylococcus aureus cause the majority of such infections, enteric bacteria account for at least 10-15%. The clinical presentation in most patients is nonspecific. Most investigators agree that the entire infected shunt should be removed before antibiotic therapy is initiated. The choice of an antibiotic should be guided by in vitro susceptibility of the etiologic agent, and the ability of the drug to pass the blood-brain barrier. The efficacy of prophylactic antibiotics in reducing shunt infections is controversial.

Bacterial Infections↗

Congenital tuberculosis: critical reappraisal of clinical findings and diagnostic procedures.

The recent pattern of immigration from Indochina and Latin America to the United States suggests that tuberculosis will remain a significant public health problem. Two infants recently seen with probable congenital tuberculosis prompted critical evaluation of the 24 cases of congenital tuberculosis reported in the English literature since the introduction of isoniazid in 1952. Failure to thrive, jaundice, and central nervous system involvement, all reported in previous reviews and textbooks to be very common, were unusual presenting manifestations. In contrast, hepatomegaly, a finding not mentioned in the recent literature, was common. Diagnostic procedures previously underutilized but found in this review to be useful included liver biopsy, biopsy of skin lesions when present, and cultures of gastric aspirates. Factors which enable differentiation of congenital from early postnatally acquired tuberculosis include (1) the presence of known maternal tuberculosis at delivery, (2) whether infant and mother were separated from birth until the onset of illness, and (3) whether other tuberculous exposure of the infant can be determined. Insufficient data prevent recommendation of a preferred regimen of drugs in addition to isoniazid for the treatment of congenital tuberculosis. However, the responses of our patients suggest that streptomycin can be omitted without hazard. Information regarding the long-term prognosis of survivors is lacking, but early diagnosis and institution of appropriate therapy has markedly decreased the mortality of this previously fatal disorder.

Female↗

Ventricular fluid levels of chloramphenicol in infants.

Investigation of two infants suggested that peak ventricular fluid levels of chloramphenicol after intravenous administration were achieved after 3 h. The penetration of chloramphenicol into ventricular fluid may be unpredictable. In one patient, the peak ventricular fluid level was 57.5% of the peak serum level, and it was only 22.5% in the other patient. This observation may explain some of the past treatment failures when chloramphenicol was utilized in patients with gram-negative ventriculitis and meningitis.

Brain Diseases↗

Ventriculitis from Acinetobacter calcoaceticus variant anitratus.

Ventriculitis from infection with Acinetobacter calcoaceticus variant anitratus occurred in an infant two weeks after surgical repair of a lumbosacral meningomyelocele and ventriculoperitoneal shunting. Recovery took place on replacing the shunt with an extraventricular deviation device and giving gentamicin and ampicillin intravenously.

Acinetobacter Infections↗

Viral hepatitis.

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Adult↗

Effect of TMP-SMX on nasopharyngeal carriage of ampicillin-sensitive and ampicillin-resistant hemophilus influenzae type B.

The carriage rate of ampicillin-resistant Hemophilus influenzae type B in a chronic care facility was investigated. Up to 48% of the children carried this strain. Of interest was the finding of simulaneous carriage of ampicillin-resistant and ampicillin-sensitive HITB, a phenomenon which was detected by using both chocolate agar and chocolate agar containing 2 microgram/ml of ampicillin. A trial of sulfamethoxazole-trimethoprin successfully eradicated the ampicillin-sensitive HITB, but had no effect on the ampicillin-resistant HITB.

Ampicillin↗

Enterobacter aerogenes primary bacteremia in pediatric patients.

Enterobacter aerogenes bacteremia associated with the infusion of contaminated admixed intravenous (IV) fluid occurred in seven patients in a pediatric hospital over a five-day period. Clinical illness was characterized by spiking fever in all patients. The temporal clustering of cases allowed for rapid recognition of the problem. The primary control measure was the prompt replacement of the IV fluids, although IV antibiotics were also administered. Hospital pharmacy practices for admixing IV solutions should follow published recommendations to minimize this source of potential contamination of fluids.

Child↗

Wound infection following dog bite despite prophylactic penicillin.

Dog bite wounds of 39 children (ages one to 16 years) were cultured and irrigated. Cultures showed various organisms but were of no predictive value for development of infection. By using a table of random numbers, patients were assigned to either oral penicillin V-K (100,000 U/kg/day every 6 h) or placebo for two days. All patients were seen in follow-up in three to four days and again at seven to 10 days or earlier if signs of inflammation occurred. The mean patient age, location and type of wound, and initial wound care were similar in the two treatment groups. Three of 39 (7.7%) children enrolled in the study developed infection at the bite site, including two of 19 in the penicillin group and one of 20 in the placebo group. In our study, prophylactic penicillin failed to prevent infection in dog bite wounds. Good local care on presentation seems to be the most important factor in determining future infection.

Adolescent↗

Group C beta-hemolytic streptococcal infections in children: nine pediatric cases and review.

Streptococci of Lancefield group C colonize healthy individuals but infrequently cause invasive disease. Eight pediatric cases of infection due to group C streptococci were identified in a retrospective survey of a recent 6-year period at a children's hospital. An additional case of group C meningitis diagnosed in 1975 was included. These nine cases and 22 pediatric cases from the literature are presented to illustrate important points with respect to clinical presentations and complications and to show that these organisms can cause serious, sometimes fatal infection: pneumonitis, sinusitis, septicemia, endocarditis, osteomyelitis, and meningitis. Group C streptococci are described in terms of their biochemical properties, the infections they cause in animals, and their tendency to produce disease in humans. With increasingly frequent serologic grouping of non-group A beta-hemolytic streptococci, recognition of the role of specific non-group A streptococci is likely to increase. The antimicrobial agent of choice for infections due to group C streptococci is penicillin G. The minimum inhibitory and minimum bactericidal concentrations for the organism should be determined since penicillin tolerance may occur and may be responsible for the slow response to penicillin therapy in some cases.

Adolescent↗

Peritonitis due to Kluyvera ascorbata: case report and review.

Kluyvera, a new genus in the family Enterobacteriaceae, was formerly known as enteric group 8 and as API group 1. Although Kluyvera species have been isolated from various clinical specimens such as sputum, urine, stool, and blood, the clinical significance of these isolates has not been established. Recently, we treated a child who developed peritonitis due to Kluyvera ascorbata. The repeated isolation of the organism in pure culture from the peritoneal fluid and its isolation from postmortem subdiaphragmatic microabscesses suggest that Kluyvera can be clinically significant. Review of the literature clearly indicates that Kluyvera strains are infrequent but potentially dangerous pathogens in humans. Further experience is needed to determine the therapeutic efficacy of the various antibiotics to which these bacteria are sensitive in vitro.

Adolescent↗