PubMed · 253714
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L Schamroth, J Joubert. Ventricular interpolation with prolonged effect.. https://pubmed.ncbi.nlm.nih.gov/253714/
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A revised technique is described in which the sino-atrial node, the atrio-ventricular node and the distal part of the His bundle and the bundle brances of the cardiac conduction system are demonstrated in longitudinal sections through cutting of 4-5 blocks. The longitudinal sectioning allows observation of continuity between different components of the cardiac conduction tissue. This method reduces the workload and hopefully encourages the pathologist to make the examination of the cardiac conduction system a part of the routine procedure.
To assess the hemodynamic effects of right ventricular septal pacing in patients with severe chronic heart failure, we studied 13 patients during intrinsic rhythm and with pacing in the VDD mode at atrioventricular delays of 100 to 200 ms. There was no improvement of any hemodynamic parameter measured with pacing, even in the subgroup of patients with prolonged PR intervals.
OBJECTIVE: To determine the atrioventricular (AV) conduction time in prematurely born infants as part of a comparative electrocardiological study of conduction times versus heart size. DESIGN: Recording and analysis of electrocardiograms. SETTING: Department of Neonatology, University Hospital of the Free University of Amsterdam, the Netherlands. METHODS: Using bipolar precordial leads of standard monitoring equipment in 28 babies, born at a gestational age of 26-36 weeks, ECGs were recorded as soon after birth as possible. The ECGs were analysed and relevant conduction times, such as PR intervals and QRS durations, were measured by hand. These data were related to the birth weights of the infants. (The heart weight amounts to approximately 0.6% of body weight.) RESULTS: Average birth weight of the babies was 1374 g (SD: 491), average PR interval 93 ms (9), QRS duration 40 ms (4), and average heart rate 148/min (14). CONCLUSION: Human hearts weighing 6-10 g have conduction times half that of the adult human heart which weighs 50 times as much. The contribution of the AV node to the total AV conduction time increases with diminishing heart size.