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Biomedical subjects

J Clementy

Publications and source records attributed to J Clementy.

At least 91 records · Page 5Linked to original sources
PubMed1980

Alternate ventriculoatrial Wenckebach conduction.

Three cases are presented showing retrograde alternate Wenckebach periods. Retrograde alternate Wenckebach periods were defined as 2:1 ventriculoatrial (VA) block in which the conducted beats showed progressive prolongation of conduction (VA) time. The sequence terminates with two or three successively blocked ventricular beats. In one of the three cases the level of block was identified as being in the atrioventricular (AV) node. In the other two the level of block could not be clearly identified. This report provides further evidence for the concept of multilevel block within the AV node. Retrograde alternate Wenckebach periods may explain some instances of variation of atrial depolarization intervals during episodes of ventricular tachycardia and may be clinically significant.

Aged↗
PubMed1979

Pacing-induced alternate Wenckebach periods: incidence and clinical significance.

Alternate Wenckebach periods have been defined as episodes of 2:1 atrioventricular (AV) block in which conducted P waves exhibit progressive PR prolongation until two or three successively blocked P waves. Ocurrence of this phenomenon during atrial pacing has been established. Thirty-six patients were studied and right atrial pacing was achieved at increasing rates up to 350 beats/min in order to induce alternate Wenckebach periods. His bundle recordings were obtained in every patient. The patients were subdivided into three groups according to the AV nodal conduction time (AH interval): normal AH (75-130 ms) was present in 17 patients, short AH (70 ms) in 13 patients and prolonged AH (130 ms) in eight patients. Alternate Wenckebach periods were observed in 29 patients (80.5%). In every patient alternate Wenckebach periods occurred at the AV node level. Atrial pacing failed to induce alternate Wenckebach periods in seven patients, six of whom belonged to the short AH group. In four patients 3:1 block never appeared because of block at the atrial level. Two patients presented 2:1 and 3:1 infrahissian block without significant AH prolongation. The remaining patient developed atrial fibrillation. Alternate Wenckebach periods were observed in six of nine patients after intravenous atropine. This study suggests: 1. pacing-induced alternate Wenckebach periods at the AV node level are a physiologic phenomenon; and 2. total or partial bypass (or accelerated AV conduction) atrial refractoriness or vulnerability or block at a lower level may prevent its occurrence.

Adult↗
PubMed1978

[Stenosis of the thoraco-abdominal aorta by endovascular calcification, with hypertension. Surgical treatment (author's transl)].

A case of a 24 year-old man in whom, following acute pulmonary oedema complicating hypertension known for a period of three years, stenosis of the thoraco-abdominal aorta produced by a large calcification within a zone of the aorta with an inflammatory appearance was demonstrated. This case is included within the context of the aortic syndrome. Operation led to normalisation of blood pressure immediately afterwords, but there was moderate hypertension 56 months later.

Adult↗
PubMed1976

[Reintervention after valve replacement surgery. Study of 358 cases].

There is still a place for conservative surgery in valvular disease of the heart to the extent that artificial prostheses have not yet been perfected sufficiently for them to be regarded as the method of choice. While these conservative operations are rarely applicable to the aortic valve, techniques such as Carpentier's ring occupy an important place in the treatment armamentarium for disorders of the mitral valve, and even more so of the tricuspid valve.

Aortic Valve↗
PubMed1976

[Congenital bundle-of-his focal tachycardias. Cooperative study of 7 cases].

The authors described seven cases of supraventricular tachycardia with atrio-ventricular dissociation, associated with the activity of an automatic focus in the bundle of His. These tachycardias, which appear at birth or are discovered at a very young age, appear to be congenital and sometimes familial, and are always isolated, having no associated cardiac abnormality. They give rise to cardiac failure, which is more marked when the rate is high (180-260/mn) and particularly resistant to treatment. The most effective form of treatment is amiodarone, almost always used in combination with digitalis. The anatomical abnormality, which was studied in the first case, is a contricting fibrosis around the main trunk of the bundle of His, and the appearances are reminiscent of those found in conditions of congenital atrio-ventricular block.

Amiodarone↗