No abstract

Background: Vancomycin is a common drug used in children with severe infection. In adults, at least 15 mg/L of the optimal vancomycin trough concentration (C trough ) is needed to generate the target 24-h area under the concentration-time curve (AUC 24 ) to the minimum inhibitory concentration (MIC) of 400 for a pathogen with the MIC 1 mg/L. Objectives: To determine vancomycin PK in children with severe infection and to explore the correlation between vancomycin C trough and AUC 24 in children, as well as to propose the appropriate vancomycin dosages using Monte Carlo simulation. Materials and methods: Children aged 2-18 years who were admitted to Chiang Mai University Hospital and received intravenous vancomycin for severe infection were included in the study. Serum samples for vancomycin PK were obtained before and serially after the administration of the first dose according to the protocol. Pharmacokinetic analyses were performed using Phoenix WinNonlin 1 7.0 and NLME TM 7.0. Results: Fourteen children with 64% males and age range from 2 to 13 years were included in this study. Non-compartmental analysis revealed the median volume of distribution, clearance, and elimination half-life of 0.58 L/kg, 2.82 mL/kg/min and 2.33 h, respectively. Vancomycin serum concentrations were best described by a two-compartmental model with first-order elimination.The observed C trough at 6 h correlated well with the AUC 24 . The median vancomycin C trough at steady state that correlated with the AUC 24 ! 400 and <800 were 11.18, 9.50, 7.91 and 6.55 mg/L in simulated children receiving vancomycin 40, 60, 80 and 100 mg/kg/day, respectively. Conclusion: Correlation between vancomycin C trough and AUC 24 values in children has been observed. However, the values of C trough that correlate with the target AUC 24 !400 in children are lower than the values observed and targeted in adults.

SUMMARYThe incidence of diphtheria has decreased since the introduction of an effective vaccine. However, in countries with low vaccination rates it has now become a reemerging disease. Complications from diphtheria commonly include upper airway obstruction and cardiac complications. We present a 9-year-old boy who was diagnosed with diphtheria. He presented with fever, tonsilar plaques, respiratory failure and an incomplete vaccination history. He was endotracheal intubated and received diphtheria antitoxin and penicillin on the first day of hospitalisation. He developed progressive arrhythmias and fulminant myocarditis despite early identification and treatment with equine antitoxin and antibiotics. After a temporary transvenous pacemaker insertion due to thirddegree atrioventricular block and hypotension for 1 week, he developed myocardial perforation from the pacemaker tip resulting in pericardial effusion. The treatment included emergency pericardiocentesis and pacemaker removal. His electrocardiogram showed a junctional rhythm with occasional premature ventricular complexes. He then developed ventricular tachycardia and cardiac arrest and finally died. BACKGROUND

Dengue is a mosquito-borne infection affecting children and adults worldwide. In newborn infants, the dengue virus can cause diseases, especially in infants born to pregnant women hospitalised with dengue or postpartum women with fever. The authors report a case of a term newborn infant who presented with haemodynamic instability and thrombocytopaenia at the age of 7 days, without a history of clinical dengue infection in the mother. The physical examination revealed an afebrile and drowsy infant with a petechial rash all over the body and ecchymosis on both palms and soles. The authors confirmed the diagnosis using the dengue NS1 antigen on the first day of admission. The treatment included fluid management and platelet transfusion. The patient recovered well and was discharged from the hospital on the 10th day of hospitalisation.

SUMMARYMalaria and dengue fever are major mosquito-borne public health problems in tropical countries. The authors report a malaria and dengue co-infection in an 11-yearold boy who presented with sustained fever for 10 days. The physical examination revealed a flushed face, injected conjunctivae and left submandibular lymphadenopathy. His peripheral blood smear showed few ring-form trophozoites of Plasmodium falciparum. His blood tests were positive for dengue NS-1 antigen and IgM antibody, and negative for IgG antibody. After the initiation of antimalarial treatment with artesunate and mefloquine, his clinical condition gradually improved. However, he still had low-grade fever that persisted for 6 days. Finally, he recovered well without fluid leakage, shock or severe bleeding. This case report emphasises that early recognition and concomitant treatment of malaria and dengue co-infection in endemic areas can improve clinical outcome and prevent serious complications. BACKGROUND