https://www.um.edu.mt/library/oar/handle/123456789/27496 2026-04-23T07:50:44Z https://www.um.edu.mt/library/oar/handle/123456789/4069 Title: Transvenous pacemaker in a child less than 6 kg Authors: Krasemann, Thomas; Rukosujew, A.; Scheld, H.H. Abstract: The insertion of transvenous pacemakers in chidren is limitated by the calibre of the upper chest veins and for this reason, many children receive epimyocardial leads. This article reports a small patient who developed complete atrioventricular block after an arterial switch operation for transposition of the great arteries. 2004-01-01T00:00:00Z https://www.um.edu.mt/library/oar/handle/123456789/3997 Title: How to achieve balloon stability in aortic valvuloplasty using rapid ventricular pacing Authors: Mehta, C.; Shebani, S.; Grech, Victor E.; DeGiovanni, Joseph V. Abstract: Balloon aortic valvuloplasty is now the treatment of choice for congenital aortic stenosis. Balloon stability may be difficult to achieve and this may result in a suboptimal result or even valve damage. We describe the technique of rapid ventricular pacing as a safe and effective option for achieving balloon stability during aortic valvuloplasty. 2004-01-01T00:00:00Z https://www.um.edu.mt/library/oar/handle/123456789/3996 Title: Right ventricular myocardium in Fallot's tetralogy : a light microscopic, morphometric and ultrastructural study Authors: Kuruvilla, Sarah; Parvathy, Usha; Balakrishnan, K.R. Abstract: Aims: To analyze peroperative biopsies of RV myocardium in Tetralogy of Fallot by light microscopy, morphometry and electron microscopy in order to determine the degree of hypertrophy and degenerative changes and to correlate these changes with clinical and haemodynamic parameters. Materials and Methods: Right ventricular myocardium obtained peroperatively during surgical correction of Tetralogy of Fallot along with age-matched control samples were processed for routine light and electron microscopy using standard processing techniques. Mean cell diameter was analyzed using manual morphometric methods and ultrastructural study was carried out using a Philips transmission electron microscope. Results: The most consistent features of hypertrophy were the mitochondrial changes and increased nuclear convolutions. Majority of the patients had hypertrophy with mild to moderate degenerative changes. Severe degeneration was associated with irreversibility and was related to the severity and chronicity of the disease. There was a significant correlation of the morphological changes with clinical and haemodynamic parameters. Conclusions: Peroperative histomorphometric and ultrastructural evaluation of the RV myocardium in Tetralogy of Fallot reflects the effect of haemodynamic stresses on the right ventricular muscle and correlates with clinical cardiac dysfunction. It may be a useful adjunct in determining the time for surgical intervention and in predicting clinical outcome. 2004-01-01T00:00:00Z