Electroanatomic and basket catheter mapping revealed a focal tachycardia originating in the superior vena cava (SVC), 5 cm above the SVC-right atrium (SVC-RA) junction. An area of fractionated potentials and slow conduction was found on the anterior wall of the SVC. A line of conduction ...
(b) What causes the second heart sound ("dub")?The Heart:The heart is a vital organ found in the centre of the thorax and is part of the circulatory system. The function of the heart is to receive blood and pump it to different parts of the body by contracting ...
What is the QRS complex? What is agonal breathing? What is urinary stasis? What is a couplet heart rhythm? What is a compass needle? What is enterococcal endocarditis? What is vestibular neuritis? What is the importance of a metastable state?
The ECG tracing consists of several components, including a P wave, a T wave, the QRS complex, and an ST segment. Each component of an ECG can be recorded, measured, and used to observe and inspect a specific aspect of the heart's activity. The P wave reveals electrical activity of ...
How to measure the QT interval--what is normal? The QT interval extends from the beginning of the QRS complex to the end of the T wave. Since the report of Jervell and Lange-Nielsen in 1957, it has been difficult to determine whether to measure a QT or a QU interval. U waves are ...
Class 1C agents are probably responsible for widening of the QRS complex seen during these tachycardias. Propafenone and flecainide appear equally effective ... GL Botto,W Bonini,T Broffoni,... - 《Pacing & Clinical Electrophysiology》 被引量: 45发表: 2010年 [Supraventricular tachycardia with ...
R waves are the first upward deflection within a series known as the QRS complex. As part of the QRS complex, an R wave is an important indicator of cardiac health. Cardiologists and other health professionals analyze ECGs to diagnose various cardiac diseases. Some common causes of R wave ...
What is the qt interval and how should it be measured? The QT interval on the surface ECG is measured from the beginning of the QRS complex to the end of the T wave. Thus, it is the electrocardiographic manifestation of ventricular depolarization and repolarization. This electrical activity ...
Which ECG would you expect the doctor to order when the patient has dextrocardia? 4 In patients with dextrocardia, thestandard 12-lead ECGwill show marked right-axis deviation of the P wave and QRS complex, with lead I frequently demonstrating a largely negative QRS complex and inverted P and...
Irregular narrow QRS complex tachycardia with intermittent atrioventricular dissociation: What is the mechanism?atrioventricular dissociationatrioventricular nodal reentrycatheter ablationupper common pathwayA 39﹜ear﹐ld woman with frequent palpitations was referred for radiofrequency ablation. A baseline 12﹍ead...