Journal of electrocardiology
-
Combined sinoatrial and atrioventricular block is rare and has been reported in patients on digitalis. We report a case of combined Mobitz type II sinoatrial block and 2:1 atrioventricular block in a patient on no medication who presented with recurrent syncope.
-
Measures of heart rate variability (HRV) can be divided in time domain and frequency domain parameters. It is frequently ignored that estimation of frequency-domain parameters is a 2-step procedure where statistical error from the first step (spectral estimation) is neglected in subsequent analyses. ⋯ Frequency domain parameters should be applied in HRV analysis only if important physiological reasons suggest their use. If used, frequency domain parameters should be interpreted with caution, taking into account the statistical weaknesses of spectral estimation.
-
The correlation between ST-segment elevation (ST upward arrow) in lead V(3)R (ST upward arrow(V3R)), lead V(1) (ST upward arrow(V1)), and lead aVR (ST upward arrow(aVR)) during anterior wall acute myocardial infarction (AMI) and the culprit lesion site in the left anterior descending (LAD) coronary artery and the nature of the conal branch of the right coronary artery has not been thoroughly described. ⋯ In patients with anterior wall AMI, ST upward arrow(V3R) of at least 1 mm combined with ST upward arrow in leads V(2) through V(4) were strongly predictive of LAD occlusion proximal to S1; furthermore, ST upward arrow(aVR) and ST upward arrow(V1) of at least 2 mm were found to be useful in identifying LAD occlusion proximal to S1. ST upward arrow(aVR), ST upward arrow(V3R) of at least 1.5 mm, and ST upward arrow(V1) of at least 2.0 mm were also associated with the presence of a small conal branch not reaching the intraventricular septum during anterior wall AMI.