PubMed Health⌕ Search

Biomedical subjects

O A da Silva

Publications and source records attributed to O A da Silva.

At least 19 recordsLinked to original sources
PubMed1997

Yeasts associated with nests of the leaf-cutting ant Atta sexdens rubropilosa Forel, 1908.

A total of 137 yeasts associated with the leaf-cutting ant Atta sexdens rubropilosa Forel, 1908 were characterized, being selected 93 for analysis. Twenty four species belonging to seven genera (Candida, Cryptococcus, Rhodotorula, Sporobolomyces, Tremella, Trichosporon, Pichia) were isolated from the different analysed material. The genus Candida was widely distributed, with C. homilentoma, C. colliculosa-like, C. famata and C. colliculosa being the most prevalent. A few isolates did not fit the standard descriptions and probably some of them could be new biotypes or even new species. Three strains of black yeasts were also isolated, and four other were identified as being Candida spp. The effective number of yeast species was higher in newer sponge. The origin, distribution and relative importance of these microorganisms for the ants are discussed.

Animals↗
PubMed1994

CD23 and IgE expression during the human immune response to cutaneous leishmaniasis: possible role in monocyte activation.

Leishmania brasiliensis causes cutaneous leishmaniasis (CL) in humans. During this infection, a variety of inflammatory mediators are produced by T cells and monocytes/macrophages. In the present study, we analysed serum IgE levels and their correlation with in situ expression of the low affinity receptor for IgE (Fc epsilon RII/CD23) in patients infected with L. brasiliensis before and following therapy. These analyses were compared to in situ expression of tumour necrosis factor-alpha (TNF alpha), interleukin 3 (IL3), interferon-gamma (IFN gamma) and IL4. Disease-free individuals from the same endemic area sensitized with L. brasiliensis antigens were also included in this work. Our data indicate that during infection, serum levels of IgE and TNF alpha increased and correlated with elevated in situ expression of CD23, IL4 and TNF alpha mRNA. This expression disappeared following successful treatment, but persisted in patients resistant to anti-leishmania therapy. Patients resistant to therapy differed from other cases by a dramatic decrease in their in vivo expression of IFN gamma protein. Analysis of CD23 function in purified human monocytes indicated that this antigen mediates IgE/anti-IgE-dependent TNF alpha production. These data suggest a possible in vivo role of CD23 in acute immune responses in human CL.

Animals↗
PubMed1981

Hypokalemic respiratory muscle paralysis following Strongyloides stercoralis hyperinfection: a case report.

Strongyloides stercoralis hyperinfection in a malnourished 6-year-old boy was characterized by severe diarrhea, dehydration and marked hypokalemia, followed by acute respiratory failure due to respiratory muscle paralysis, and cardiac arrest. He was resuscitated and maintained with positive pressure ventilation and intravenous infusion of potassium and gluco-saline solution. These measures produced recovery from the respiratory muscle paralysis. Stool examination revealed eggs and numerous larvae of S. stercoralis, and thiabendazole was initiated. He continued to have severe diarrhea and again developed marked hypokalemia with respiratory muscle paralysis, abdominal distention, and cardiac arrhythmias with cardiac arrest episodes. In spite of fluid and electrolyte replacement the patient died.

Arrhythmias, Cardiac↗
PubMed1980

Afibrinogenemia following snake bite (Crotalus durissus terrificus).

Following the bite of Crotalus durissus terrificus, an 11-year-old boy developed afibrinogenemia and high output acute renal failure. His platelet count remained within normal limits. He was treated with epsilon aminocaproic acid and whole fresh blood transfusion, with full recovery from afibrinogenemia 40 hours after the beginning of these measures and 75 hours after the snake bite. No hemorrhagic disturbances were present. The acute renal failure was treated conservatively, and the patient recovered 12 days after the snake bite and discharged from hospital with no sequelae.

Acute Kidney Injury↗
PubMed1979

Verapamil acute self-poisoning.

A previously healthy girl, without heart disease, who ingested 2400 mg of verapamil developed hypotension, trifasicular block pattern, mental confusion, mild metabolic acidosis, and hyperglycemia. She recovered with symptomatic and supportive therapy. A discussion is presented about the action mechanism of the drug.

Adolescent↗
PubMed1979

Intensive care unit treatment of acute renal failure following snake bite.

Twenty-nine patients with acute renal failure following bites by snakes of the genera Crotalus and Bothrops were treated in an Intensive Care Unit (ICU). Eight were given conservative treatment. Peritoneal dialysis was necessary in 21 patients, and hemodialysis in one of these. The main complications occurring while the patients were in the ICU were pulmonary edema (5 cases), respiratory failure (4), cardiac arrest (4), and hypovolemic shock (1 case). Three patients died with respiratory and hemodynamic disturbances while in the ICU, one of them during the polyuric phase. Twenty-four patients were discharged from the hospital with no clinical or laboratory evidence of renal failure. Two patients developed bilateral cortical necrosis of the kidney. One of them died in the general ward after interruption of dialysis and the other was discharged from the hospital with chronic renal failure. It was not possible to perform a kidney transplantation. The importance of the ICU in the recovery of such patients is stressed.

Acute Kidney Injury↗
PubMed1979

Bilateral cortical necrosis and calcification of the kidneys following snakebite: a case report.

A 16 year-old-boy was admitted to the ICU of university hospital with acute renal failure following snakebite. The clinical evolution of the patient associated with radiological findings of renal calcification suggested bilateral cortical necrosis of the kidneys. The biopsy findings were compatible with this diagnosis. The patient was discharged 86 days after his admission, with chronic renal failure, since a kidney transplantation was not possible.

Acute Kidney Injury↗
PubMed1977

Pipazethate--acute childhood poisoning.

A previously healthy child who who had accidentally ingested an unknown quantity of 20-mg tablets of pipazethate developed severe acute poisoning with neurologic, metabolic, and cardiovascular disturbances. She recovered with symptomatic and supportive therapy.

Acidosis↗