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Biomedical subjects

A A Mallouh

Publications and source records attributed to A A Mallouh.

At least 19 recordsLinked to original sources
PubMed1995

An epidemic of aplastic crisis caused by human parvovirus B19.

Human parvovirus B19 has been associated with several diseases. Aplastic crisis in patients with chronic hemolytic anemia, erythema infectiosum, hydrops fetalis and arthritis are among the common diseases caused by this virus infection. In the period between July, 1991, and March, 1992, 48 patients with aplastic crises were hospitalized at Saudi Aramco-Dhahran Health Center, Dhahran, Saudi Arabia. Forty-six patients had homozygous sickle cell disease, one had hemoglobin H disease and one had hereditary elliptocytosis. Evidence of recent human parvovirus infection was present in 91% of the cases. Leukopenia was present in 21%, neutropenia in 27% and thrombocytopenia in 42%. This differs from previous reports in which red blood cell aplasia causing anemia was the only hematologic finding reported in most patients. There were no cases of erythema infectiosum in either the patients or the community during the epidemic and the reason for this phenomenon is not obvious. The almost limited occurrence of aplastic crisis in patients with sickle cell disease in a population with a high incidence of other types of chronic hemolytic anemias is of interest.

Adolescent↗
PubMed1992

Agnogenic myeloid metaplasia in children.

Agnogenic myeloid metaplasia is a chronic myeloproliferative disorder characterized by splenomegaly, leukoerythroblastosis, extramedullary hematopoiesis, teardrop-shaped red blood cells, and fibrosis of the bone marrow. It is a disease of adults, with only one case report in the pediatric literature. The symptoms of the patient in this case clearly fit the diagnostic criteria of this disease. Myelofibrosis in children is usually of the acute type, presenting in infancy and running a fulminant, fatal course with minimal or mild splenomegaly. Red blood cells are usually normal on morphologic examination. Three infants, including two siblings, presented at ages 9, 10, and 16 months with clinical and laboratory findings consistent with agnogenic myeloid metaplasia. The occurrence of the disease in these siblings is suggestive of an autosomal recessive mode of inheritance.

Biopsy↗
PubMed1992

Screening for glucose-6-phosphate dehydrogenase deficiency can prevent severe neonatal jaundice.

Infants with the severe variant of glucose-6-phosphate dehydrogenase (G6PD) deficiency may develop hyperbilirubinaemia sufficiently severe to cause kernicterus and death, acute haemolysis on exposure to oxidant stress, congenital non-spherocytic haemolytic anaemia and, rarely, increased susceptibility to bacterial infection. In spite of these potential problems, G6PD deficiency is often not included among screening programmes for inherited disorders. In a comprehensive screening and educational programme, we tested around 34,000 infants for G6PD deficiency. Of the total group, 18.4% (24.5% boys and 11.8% girls) were deficient. Forty-two of the 6246 (0.67%) G6PD-deficient infants required exchange transfusion. None of them developed kernicterus. By contrast, of 4755 infants who had not been screened because they were born at home, three developed kernicterus. In addition, four G6PD-deficient infants had developed kernicterus in the 20-month period prior to the screening programme. None of the hyperbilirubinaemic infants had blood group incompatibility or any other identifiable cause of hyperbilirubinaemia. To avoid this disastrous result, we believe that neonatal screening for G6PD deficiency, together with a comprehensive education programme, is advisable in those parts of the world where the severe variant of G6PD deficiency is prevalent.

Feasibility Studies↗
PubMed1989

Nasopharyngeal Hodgkin's disease with intracranial extension in a child.

Childhood Hodgkin's Disease rarely involves the nasopharynx or the brain. This is a report of a 12-year-old boy who presented with a 3-month history of headache, diplopia, dizziness, and early morning vomiting. Computerized axial tomography (CT) scan revealed a nasopharyngeal mass with intracranial extension through the skull base. Biopsy of the nasopharyngeal mass and an upper cervical lymph node was consistent with Hodgkin's disease of mixed cellularity. This, to the author's knowledge, is the first report of a child having the combination of nasopharyngeal and intracranial involvement in Hodgkin's disease.

Child↗
PubMed1989

Incidence and causes of sepsis in glucose-6-phosphate dehydrogenase-deficient newborn infants.

To determine the susceptibility to sepsis in newborn infants deficient in glucose-6-phosphate dehydrogenase (G6PD), we screened 33,943 Saudi Arab infants. Deficiency of G6PD was found in 18%. Sepsis was determined by the presence of clinical signs of sepsis and confirmed by positive blood cultures. Sepsis was documented in 75 infants (2.2/1000). The incidence of sepsis was significantly higher in 6138 G6PD-deficient infants (3.4/1000) than in the 27,805 with normal G6PD activity (1.9/1000; p less than 0.02). The incidence of catalase-positive organism sepsis was higher in G6PD-deficient infants (2.9/1000) compared with those with normal G6PD activity (1/1000; p less than 0.0002), whereas the incidence of catalase-negative organism sepsis did not differ (p less than 0.2). Deficiency of G6PD was more common in infants with late sepsis (46%) than in those with early sepsis (21%) and in all infants screened (18%) (p less than 0.03 and p less than 0.001, respectively). We conclude that neonates with G6PD deficiency are more susceptible to late sepsis and to infection with catalase-positive organisms. The exact mechanism for the increased susceptibility is not clear, but a partial explanation could be lack of leukocyte bactericidal activity associated with G6PD deficiency, and an increased susceptibility to infection caused by hyperferremia resulting from lysis of G6PD-deficient erythrocytes.

Bacteria↗
PubMed1989

Acute splenic sequestration crises in Saudi children with sickle cell disease.

Sickle cell disease (SCD) is a common disease in the Eastern Province of Saudi Arabia. Twenty per cent of the population have sickle cell trait and 1.75% have SCD. In the first 2 years of life, infection, hand-foot syndrome and acute splenic sequestration crisis (ASSC) are the most common complications of this disease. The classical characteristics of an ASSC, the subject of this paper, are sudden and rapid enlargement of the spleen, secondary to the massive pooling of red blood cells in the splenic sinusoids in a functioning spleen. Less common minor attacks of ASSC have been described recently. An ASSC is one of the most common causes of death in infants with SCD. The underlying cause and the precipitants of attacks of ASSC remain unknown. Seventeen children with ASSC were seen. Clinically, they had minor ASSC; three developed hypersplenism and four underwent splenectomy for recurrent attacks of ASSC. None of these 17 children had the classical ASSC described in black children where peripheral circulatory shock is encountered.

Acute Disease↗
PubMed1988

Beneficial effect of blood transfusion in children with sickle cell chest syndrome.

Reports in the 1970s suggested that acute chest syndrome (ACS) in children with sickle cell disease is usually due to bacterial infection. Studies in adults and more recently in children, however, showed that proved bacterial infection occurs in a minority of these patients and that vascular occlusion is the main pathologic process. In a retrospective study of 32 episodes of ACS in children, a definite bacterial infection was found in 3% (one patient), possible bacterial infection in 11% (four patients), and a possible mycoplasma in 13% (five patients). With the intent to dilute sickle cells, 23 patients received blood transfusion within 24 hours after hospital admission; all showed a dramatic clinical and roentgenographic improvement. Of the nine patients who did not receive a transfusion after hospital admission, the conditions of five patients deteriorated but improved after "late" transfusion; three patients showed slow improvement, and only one patient improved within 48 hours. From this we conclude that vascular occlusion might be the main process in ACS and that early blood transfusion may be valuable in shortening the course and decreasing mortality. The low hemoglobin value at presentation in our patients makes dilution of sickle cells possible by packed red blood cell transfusion rather than exchange transfusion.

Acute Disease↗
PubMed1988

Cholestatic jaundice with urinary tract infection in a child with acute lymphoblastic leukaemia.

The syndrome of cholestatic jaundice in association with urinary tract infection with normal or slightly elevated liver enzymes has been reported mainly in newborns and infants below 2 months of age. The relative immaturity of the infant's liver and its sensitivity to bacterial endotoxins may explain the occurrence of this syndrome in this age group. A similar syndrome has been reported in adults with severe non-hepatic bacterial infection, including some with urinary tract infection. However, only three case reports in older children could be found. In this report, the case of a 4-year-old girl with acute lymphoblastic leukaemia, who presented with cholestatic jaundice with normal liver enzymes and urinary tract infection, is described. Treatment with antibiotics resulted in resolution of the jaundice and potentially hepatotoxic drugs were used for the treatment of leukaemia with no problems. Two adult patients with acute leukaemia, non-hepatic bacterial infection and cholestatic jaundice have been reported; both died shortly after diagnosis.

Child, Preschool↗
PubMed1988

Acute cholestatic jaundice in children with sickle cell disease: hepatic crises or hepatitis?

Differentiating acute cholestatic jaundice resulting from hepatic vasoocclusive crises and hepatitis in children with sickle cell disease can be difficult. Both conditions result in hyperbilirubinemia, mainly of the conjugated type, and in elevation of serum transaminases. Five children with sickle cell disease, acute severe cholestatic jaundice and negative serology for hepatitis A and B presented in good general condition, with modest elevation of serum transaminases, and had an early uneventful recovery. Five children with sickle cell disease and serologically proved hepatitis A infection were sicker, exhibited a similar elevation of bilirubin concentration with marked elevation of the serum transaminases and recovered more slowly. The clinical course and outcome of hepatitis A in children with sickle cell disease was similar to that of hepatitis A in normal children. Unlike early reports acute cholestatic jaundice in our patients with sickle cell disease, whether caused by hepatitis or by hepatic vasoocclusive crises, was found to be benign with an uneventful recovery.

Alanine Transaminase↗
PubMed1987

White blood cells and bone marrow in typhoid fever.

Leukopenia and/or neutropenia are thought to be characteristic findings in patients with typhoid fever. In a study of 29 children 8 months to 15 years of age mild neutropenia was found in 1 (3%) and leukopenia in 6 (20%) patients. These findings are similar to those reported recently. Epinephrine stimulation tests done in 3 patients excluded the possibility of excessive margination as a cause of neutropenia or leukopenia. In 3 neutropenic or leukopenic patients bone marrow examination showed hemophagocytosis with an increased number of histiocytes that had phagocytized neutrophils, red blood cells and platelets. This phenomenon was not seen in the bone marrow of 3 patients with normal white blood cell counts. Hemophagocytosis is an important mechanism in producing neutropenia, anemia and thrombocytopenia in several infectious and noninfectious disorders.

Adolescent↗