ECG showed sinus rhythm with first-degree atrioventricular (AV) block, ventricular rate of 80bpm, QTc 456ms, QRS 121ms, PR interval 306ms, and left axis deviation/ hypertrophy. Carotid Doppler ultrasonography also showed 0.7cm by 0.1cm non-stenotic plaque on the right common carotid. There ...
How does the ECG vary and what is occurring during these conditions: junctional rhythm, second-degree heart block, and ventricular fibrillation? ECG: The ECG variation can be represented by the reduced or increased amplitude of T-waves,...
The period during which the atria are depolarizing a) Angina pectoris b) Bradycardia c) Electrocardiogram d) Fibrillation e) Heart block f) P wave g) QRS wave h) T wave i) Tachycardia The period during which the ventricles...
QRS complexes vary in amplitude, axis, and duration in PVT. When ventricular tachycardia originates in different places around the ventricle, it is termed polymorphic ventricular tachycardia. Torsade de Pointes is a very popular
A commonly used metric for this purpose is the QVL, which is measured from the time of QRS onset on the surface ECG compared to the first larger positive or negative peak on the LV electrogram [53]. Procedural failures related to LV lead placement during CRT implantation have been ...
They record harmonized "all at once" movement—mimicking the making of a fist with all fingers squeezing in unison in patients with a normal narrow QRS interval. Conversely, a wide QRS interval defines delayed regional electrical activation, and is associated with uncoordinated contraction that may ...