References in periodicals archive ?
Because the L-type calcium current is the primary depolarizing current in sinoatrial and AV nodal cells, a reduction in calcium current can lead to AV block (Hancox and Mitcheson 1997; Kawai et al.
Whenever the ventricular rate appears to be lower than anticipated in a postoperative patient, it is important to exclude atrial tachycardias with 2:1 AV block, in which alternate P waves may be difficult to identify.
The results showed that AEx was able to: (1) increase the PR interval, (2) increase the QT interval, (3) increase the QRS complex duration, (4) decrease the cardiac rate, (5) decrease the conduction velocity of atrial impulse, (6) prolong the conduction time for the electrical impulse to travel from the right atrium to the His bundle, frequently inducing a third-degree AV block, (7) decrease the intraventricular pressure, and (8) decrease the ventricular wall mobility.
These results challenge the accepted belief that pacemaker implantation is unnecessary in these patients because AV block caused by drug toxicity is unlikely to recur.
More than 1 million Americans have AV block, which reduces the heart's ability to properly function by blocking the electrical signals between its top and bottom chambers.
After catheterization, telemetry revealed type 1 second-degree AV block (Wenckebach or Mobitz type 1 block) (Figure 2).
Cases with second- and third-degree AV block associated with VIMPAT treatment have been reported in post-marketing experience.
Of all patients 47% had a history of intermittent AV block, which is a sporadic inability of the heart to conduct signals from the atrium into the ventricle.
We did not observe QT prolongation, AV block, or significant hypotension up to the maximal feasible dose," said Philip Sager, M.
The indications for temporary pacemaker insertion reason were: in the biatrial group- sinus node dysfunction in 7 patients, type II 2nd degree AV block in 2 patients and complete AV block in one patient; in the bicaval group-type II 2nd degree AV block in 2 patients and persistent bradycardia one patient.
Sinus bradycardia (<50 bpm during waking hours), sick sinus syndrome or second and third degree AV block unless a functioning pacemaker is present