Clinical reliability of single-lead VDD pacing from evaluation of P-wave sensing under dynamic conditions.

In a group of 20 patients implanted with a single-lead VDD pacing system, a wide interindividual variability was found in P-wave amplitude changes occurring under dynamic conditions, even though they were of minor clinical relevance because constant atrial tracking was maintained.

[Clinical significance of a prolonged sinus-node recovery time as the only pathological finding: follow-up].

The Authors report their experience related to clinical follow-up (F.U.) study of a 12 patients group who showed a prolonged sinus node recovery time (SNRT) as the only pathologic datum.

[Malfunction of disc prostheses. Echocardiographic study of 5 cases (author's transl)].

78 patients who underwent disc prostheses replacement, 36 in mitral area, 58 in aortic area were studied by echocardiography. The Authors found 5 cases of malfunction, 3 in mitral area and 2 in aortic area. Regarding mitral malfunctions in 1 case a valve thrombosis was found; in 2 cases there was a partial leak.

[Transitory malfunction of an L-Kaster mitral prosthesis. Echocardiographic and polygraphic study].

An unusual instance of transient prosthesis breakdown in a 29-yr-old woman with two L-Kaster disk prostheses for mitro-aortic defect is reported. The ECHO and polygraphic traces observed during and after breakdown are examined. It is considered that the breakdown which occurred in one prostheis only, was attributable to a small, internal thrombosis with embolism of the right lower extremity.