Category Archives: ECG
Ventricular septal defect (VSD)
Swiss cheese ventricular septal defects Multiple muscular ventricular septal defects (VSD) are also called ‘swiss cheese’ VSD. Swiss cheese VSDs are difficult to close surgically. It is difficult [..]
Causes of regular RR interval in atrial fibrillation (AF)
ECG in atrial fibrillation is characterized by absent P waves, presence of fibrillary waves (f waves) and a totally irregular RR interval. But RR interval can be regular [..]
High pass filter settings for surface vs intracardiac electrogram
High pass filters allow only frequencies above the set limit to pass through and hence eliminate components below a particular frequency. For surface ECG, the high pass filter [..]
Right ventricular pacing ECG with some interesting features
Right ventricular pacing ECG with some interesting features (Click on the image for an enlarged view) This is an interesting ECG after right ventricular pacing. At one look, [..]
S5 lead for enhancing atrial activity
S5 lead for enhancing atrial activity and can be taken in the following configuration: Right arm electrode is kept on the manubrium sternum, left arm electrode on the [..]
Filter setting for pacing spike detection
Dual chamber pacing (Click on the image for an enlarged view) ECG showing two pacing spikes before each QRS complex. Initial one is atrial pacing and the later [..]
LV volume overload, IRRBB
Left ventricular volume overload, incomplete right bundle branch block (Click on the image for an enlarged view) Small initial q waves followed by tall R waves and T [..]
Left anterior hemiblock (LAHB)
Left anterior hemiblock (LAHB) (Click on the image for an enlarged view) Left anterior hemiblock (LAHB) is manifest as rS complexes in inferior leads (II, III and aVF) [..]
Atrial pacing
Atrial pacing (Click on the image for an enlarged view) Each P wave is preceded by a sharp pacing spike, indicating atrial pacing with regular pacing and capture. [..]
ECG settings
ECG settings Recording paper speed is usually set to 25 millimeters per second. Higher speed recordings may be taken on demand at 50 millimeters per second. Much higher [..]