Hepatic amebic abscess: cholescintigraphic rim enhancement

Cholescintigrams of 17 amebic liver abscesses (ALAs) in 13 patients were studied retrospectively. Rim enhancement around a photopenic defect was seen in nine (53%) of 17 abscesses. Most of the ALAs were solitary, in the right lobe, and ovoid. All were contiguous with the liver capsule. Ultrasonograms, obtained in 11 of 13 patients, showed the ALAs to be predominantly hypoechoic, with low-level echoes on high-gain settings. No sonographic finding could be identified to correlate with rim enhancement. Cholescintigraphic rim enhancement may allow early diagnosis of ALA in patients with right-upper-quadrant pain, facilitating early institution of specific therapy while definitive serologic confirmation of ALA is awaited.     

Is homozygous α-thalassaemia a lethal condition in the 1990s?

Two cases of homozygous α-thalassaemia who received active treatment in accordance with parental wishes are reported. One infant survived and the other, although successfully weaned off mechanical respiratory support, unexpectedly developed portal vein thrombosis and died. Homozygous a-thalassaemia, a condition previously considered to be universally fatal, and an indication for therapeutic abortion, is now potentially curable with advances in diagnostic technology and treatment. However, active management of these cases raises serious ethical questions and has major financial implications on the health-care system. Invasive prenatal and intensive postnatal interventions should remain experimental and cannot be recommended as routine clinical practice until the questions of long-term neurodevelopmental outcome, and the morbidity and mortality associated with bone-marrow transplantation have been fully addressed. As a result of advances in information technology, more and more parents of affected foetuses are likely to request active treatment.     

Changing patterns of susceptibilities of blood, urinary and respiratory pathogens in Hong Kong

The incidence and antimicrobial susceptibility of organisms isolated from blood, urine and respiratory specimens at a teaching hospital in Hong Kong were studied retrospectively from 1986–1993. The incidence of Gram-positive bacteraemia, particularly coagulase-negative staphylococci (CNS), increased significantly from 33·6 to 47·3% (P < 0.001) while that of Gram-negative bacteraemia fell from 60·0 to 47·0% (P < 0.001). Among blood isolates, methicillin resistance of CNS increased from 17·0 to 58·0% (P < 0.001) and cefuroxime resistance of Enterobacter spp. increased from 21·0 to over 50% (P < 0.001). Among urinary isolates, cefuroxime resistance of Klebsiella spp. (11·0 to 24·0%, P < 0.001) and Enterobacter spp. (32·0 to 75·0%, P < 0.001) increased. Nalidixic acid resistance among Gram-negative urinary isolates, except Proteus mirabilis, rose by three- to sixfold. For Streptococcus pneumoniae, isolated from the respiratory tract, penicillin resistance increased dramatically (2 to 18%, P < 0.001). For respiratory isolates of Haemophilus influenzae, ampicillin resistance increased from 17·0 to 29·0% (P < 0.001). These data are useful in guiding empirical treatment of nosocomial infections.     

Haematopoietic stem and progenitor cells in human term and preterm neonatal blood

BACKGROUND AND OBJECTIVES: Whilst cord blood (CB) contains a significant number of haematopoietic stem and progenitor cells suitable for bone marrow transplantation, levels of these cells are very low in the adult circulation. In previous studies, we demonstrated that stem and progenitor cells are present in neonatal blood (NB) and reported the first sibling transplant using a combination of CB and NB for a patient with beta-thalassaemia major. However, our preliminary data showed that the number of CD34+ cells decreased rapidly in the peripheral blood of neonates soon after birth. To further investigate the mechanism of the change of stem and progenitor cells in NB, we measured the steady-state levels of CD34+ cells, early progenitor subsets and the expression of adhesion molecules, in term and preterm neonates. MATERIALS AND METHODS: NB was collected serially from infants at 2, 4, 6, 8, 24 and 48 h after birth and was analysed by three-colour flow cytometry. RESULTS: Our results demonstrated that the number of CD34+ cells rapidly decreased in term NB, particularly during the first 2-6 h of life, by 29.2 +/- 5.55% (P = 0.0003) in absolute counts/ml. A decrease was observed in all subsets of CD34+ cells studied, including the CD33+, CD71+, CD62L+ and CD49d+ populations. In contrast, the CD34+ cell number increased in preterm infants in the first 8 h of life, before starting to decrease. Significant inverse correlations were observed between gestational age and levels of CD34+ cells (P = 0.0065, 4-h collection time-point). CONCLUSION: Our study suggests that changes in the levels of CD34+ stem and progenitor cells in NB might be triggered by parturition and affected by the gestational age. Our findings confirmed that if targeted as a supplementary source of stem and progenitor cells to CB for transplantation, NB should be collected as soon as possible after birth.     

Peptide growth factors and preimplantation development

This paper examines some of the problems and questions thatmust be considered in relation to research on the role of growthfactors in preimplantation embryos. It reviews and summarizesthe large body of work on gene expression of growth factor receptorsand ligands in preimplantation embryos and in oviduct and uterinetissue. It also reviews the literature on the effects of geneknockout in preimplantation embryos and concludes with a reviewof work on the effects of growth factors on cultured embryos.     

Rationing hospital services in Hong Kong: priority setting by clinicians using the Delphi method.

This article presents the results of a demonstration project of priority setting by clinicians in Hong Kong's public hospitals. Thirty-five chiefs-of-service of public hospitals in Hong Kong participated in a three-round Delphi exercise on identifying interventions that should be charged in public hospitals on the basis of questionable effectiveness and other reasons. A total of 246 interventions were identified in the first round, 126 of which received a positive score (indicating a high degree of consensus amongst the participants) at the end of the final round. The interventions that received higher scores tend to be preventive services, treatment of an elective nature, and procedures for sex-related conditions. As the number of interventions with positive scores in the final round are relatively small, the amount of money to be recovered from charging these interventions is not likely to be substantial. Such results suggest that rationing by itself cannot be a solution to the problems of healthcare financing in Hong Kong.