[Comparison of three brands of intracardiac pacemaker leads].

Background: Electrode lead design and materials influence their performance, stability and manipulation characteristics. In our laboratory, we use straight intracardiac, active fixation, steroid eluting leads. These features are shared by three brands of pacemaker distributors.

[Loss of biventricular resynchronization due to an uncommon cause: Report of one case].

Cardiac resynchronization therapy is a non-pharmacological treatment for patients with dilated cardiomyophaty and congestive heart failure. The success of this therapy depends of permanent biventricular stimulation. We report an 84 year-old man, with intermittent loss of biventricular pacemaker stimulation despite having adequate sensing and stimulation thresholds in the right atrium and both ventricles.

[Recurrent left atrial myxoma. Report of a case in a 2 year-old boy].

Primary cardiac tumors are uncommon in pediatric patients. We report a two year-old boy, who presented a recurrent left atrial myxoma. He was referred for cardiologic evaluation because of cardiomegaly on a chest X-ray.

[Multisite right ventricular stimulation for cardiac failure refractory to biventricular resynchronization therapy. Case report].

The prevalence of congestive heart failure has increased in the world. Despite advances in pharmacological treatment, some patients have progression of the disease and deterioration of their functional class. In this group of patients cardiac resynchronization therapy has been accepted as a treatment option.