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Biomedical subjects

Iu R Sheĭkh-Zade

Publications and source records attributed to Iu R Sheĭkh-Zade.

At least 19 recordsLinked to original sources
PubMed1999

[Adaptive-compensatory changes of autonomic balance in children with infantile cerebral paralysis].

In children of 6-7 years old with infantile cerebral paralysis the heart muscle mobilization is observed that displays in heart rate acceleration, decrease of its variability and some diminuation of adaptive reserves of cardiovascular system. As a result of such adaptation strain the adequate maintenance of the principal hemodynamic parameter (average arterial pressure) is ensured.

Adaptation, Physiological↗
PubMed1987

[Controlled atrial fibrillation and a possible mechanism of its genesis].

In experiments on cats a single premature beat or vagal stimulation shortened the effective refractory period without any spontaneous heart rate disturbances, while the combined action of these factors always led to paroxysmal tachycardia or atrial fibrillation. It is suggested that contracting myocardium possesses a covert ability for self-excitation revealed only in critical shortening of the action potential. Since the excitation occurring in such conditions is also a premature beat, the fibrillation process becomes self-maintaining.

Animals↗
PubMed1987

[Deliberate heart arrest in man and its possible mechanism].

A case of deliberate 7-second heart arrest is described. It is assumed that the effect is the result of voluntary self-irritation of peritoneal receptors by means of rhythmical diaphragm muscle contractions realized in conditions of preliminary breathing arrest.

Adult↗
PubMed1987

[General principles of heart rate control during burst stimulation of the vagus nerve in various animals].

In experiments on frogs, rats, rabbits, cats, dogs and simians the synchronization of cardiac and vagal rhythms was achieved during stimulation of vagus nerve. The relative bounds of the synchronization ranges were not dependent on the species of animal or level of sympathetic activity. In this connection, the whole variety of the cardiochronotropic reactions in vertebrates may be described with a general mathematical equation: B = A (0.769-0.098 log2N), where A is a current heart rate, B--the heart rate during the vagus nerve stimulation with bursts of N supramaximal pulses.

Animals↗