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Background Congenital heart disease (CHD) is the most common risk factor for infective endocarditis (IE) in children. Staphylococcus aureus is among the most common organisms to cause IE, yet there are little data describing the risk factors for invasive S aureus disease in children with CHD. We examined the epidemiology of S aureus infections in children with CHD. Methods Patients with a history of CHD and S aureus infection were identified from a surveillance study of S aureus infections at Texas Children's Hospital. Clinical and laboratory data from medical records were reviewed. All isolates were screened for the presence of the antiseptic tolerance gene qacA/B. Dichotomous variables were compared with Fisher's exact test and continuous variables with Mann-Whitney U tests, and two-tailed P values of <.05 were considered significant. Results Two hundred forty-eight S aureus infections developed in 216 patients with CHD. Methicillin resistance was seen in 53.6% of isolates. Surgical site infections accounted for 28.2% of cases and bacteremia accounted for 20.4% of cases. Bacteremia was associated with IE in 29.5% of the episodes. Infective endocarditis was more often associated with prolonged bacteremia, thrombocytopenia, and a higher C-reactive protein (CRP) compared with uncomplicated bacteremia. The qacA/B gene was found in 16.9% of isolates and was associated with bacteremia and prolonged hospitalization. Conclusions Staphylococcus aureus is an important cause of morbidity among children with CHD. Infective endocarditis was common with S aureus bacteremia in this population; in addition, prolonged bacteremia, thrombocytopenia, and CRP >10 mg/dL may serve as diagnostic adjuncts for IE. qacA/B-positive isolates are associated with adverse clinical outcomes. [ABSTRACT FROM PUBLISHER]

Background: Few data are available regarding pacemaker implantation after pediatric orthotopic heart transplantation. The purpose of this study was to assess the incidence, indications and associations with regard to pacemaker placement in children who have undergone orthotopic heart transplantation.Methods: We performed a retrospective study of all patients undergoing orthotopic heart transplantation at our institution from October 1984 to March 2001. Data obtained included demographics, indications for pacemaker, presence of transplant coronary artery disease and long-term follow-up. Patients were divided into: Group 1, patients requiring a pacemaker within 3 months of transplantation; and Group 2, patients requiring a pacemaker beyond 3 months.Results: Pacemakers were required in 7 of 106 (6.6%) transplant recipients. Pacing indications for patients in Group 1 (n = 2) were persistent bradycardia with pause-related ventricular arrhythmia and atrial flutter with resultant sinus pauses of up to 4 seconds. In Group 2 patients (n = 5), indications for pacing were high-grade atrioventricular (AV) block in 1 patient and episodic sinus pauses up to 3.3 seconds associated with syncope/dizziness in the remaining 4 patients. All patients in Group 2 had transplant coronary disease diagnosed within 1 year of pacemaker implantation. All had resolution of symptoms and no complications after implantation.Conclusions: Pacemakers are infrequently required after cardiac transplantation in children. Despite not meeting classic symptomatic sinus bradycardia criteria, pacemaker placement should be considered post-transplantation in patients with episodic sinus pauses and dizziness or syncope. Patients who present with the aforementioned symptoms or high-grade AV block should be evaluated closely for the presence or development of transplant coronary artery disease, as it may be their first symptom. [Copyright &y& Elsevier]