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Featured researches published by A. Castellanos.


American Heart Journal | 1958

Dissociation with interference between pacemakers located within the A-V conducting system

A. Castellanos; Luis Azan; JoséM. Calviño

Abstract Dissociation with interference occurred between pacemakers located, one at the uppermost region of the A-V junction, and the other, either above or below the bifurcation of the common bundle. A prolonged A-V conduction time of interference beats permitted the assumption that some degree of A-V block accompanied this form of dissociation. When both foci discharged at a high enough rate (over 70), it was then possible to make the diagnosis of simultaneous, independent, coexisting A-V tachycardias, a form of double tachycardia not previously described. In some records of Case 1, occasional stimuli which had their origin in the uppermost pacemaker were stopped at different levels of the auriculoventricular conduction system; the effect of this was revealed only by the unexpected failure of the succeeding beat from the same pacemaker to appear. The varying extent of penetration depended on diverse causes, which were discussed and analyzed. This physiologic phenomenon, known as concealed conduction, had been described by Langendorf, and is observed when dealing with normal as well as with depressed conductivity. The most important consideration from the clinical standpoint was the production of the arrhythmia by digitalis toxicity in old persons with arteriosclerotic heart disease and congestive heart failure. Prompt withdrawal of the drug is emphasized.


American Heart Journal | 1957

Paroxysmal tachycardia with 2:1 exit block.

J. M. Calvino; Luis Azan; A. Castellanos

Abstract The presence of 2:1 exit block was definitely established in 2 patients, one with an atrial, and the other with a ventricular tachycardia. Since this phenomenon is a property of automatic rhythms, both paroxysms were ascribed to focal impulse formation. Nevertheless, this mechanism is not to be attributed to all ectopic rhythms.


Archive | 1955

Valor de las derivaciones esofágicas en las arritmias complejas.

J. Manuel Calvino; L. Azan Cano; A. Castellanos


Archive | 1957

Vectorcardiografía espacial con compensación resistencial; metodo de Frank. I. Sujetos normales.

A. Castellanos; L. Azan Cano; J. M. Calvino; N. Taquechel


Revista cubana de cardiología | 1955

Acción de los focos ectópicos sobre los centros automáticos del corazón

A. Castellanos; L. Azan Cano; J. M. Calvino; N. Taquechel


Archive | 1958

Mecanismos de la disociación con interferencia.

L. Azan Cano; A. Castellanos; J. M. Calvino


Revista cubana de cardiología | 1958

Arritmias provocadas por aminas simpaticomiméticas

R. Ugarriza; L. Azan Cano; A. Castellanos


Archive | 1958

Acción de la clorotiazida en la insuficiencia cardíaca.

A. De Cardenas; J. Fermin Corral; L. Azan; A. Castellanos


Revista cubana de cardiología | 1957

Efectos de la procainamida sobre la taquicardia auricular con bloqueo; digitálica

A. De Cardenas; R. Ugarriza; L. Azan Cano; A. Castellanos


Archive | 1957

Estudio vectorcardiográfico de los vectores iniciales de QRS anormalmente dirigidos bacia la izquierda.

J. M. Calvino; L. Azan Cano; A. Castellanos

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