[General principles of heart rate control during burst stimulation of the vagus nerve in various animals]. / Obshchie printsipy upravleneniia serdechnym ritmom pri zalpovom razdrazhenii bluzhdaiushchego nerva u razlichnykh zhivotnykh.

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.

[Modulation of the chronotropic effect of the vagus nerve during stimulation of various sympathetic nerves in the cat]. / Moduliatsiia khronotropnogo éffekta bluzhdaiushchego nerva pri stimuliatsii razlichnykh simpaticheskikh nervov u koshek.

Sympathetic nerves were shown to perform potentiation or inhibition of synchronizing or tonic components of vagal chronotropic effect. The potentiation of the synchronizing component seems to be exerted through the ansa subclavia whereas the other effects--through the caudal cardiac nerve.

[Chronotropic vago-sympathetic interactions during electric stimulation of cardiac nerves in the cat]. / Khronotropnoe vagosimpaticheskoe vzaímodeistvie pri zalpovom razdrazhenii serdechnykh nervov u koshek.

It is demonstrated that sympathetic nerves may strengthen or depress the synchronizing or tonic components of vagal chronotropic effect, but the former was absent if extracardiac nerves were cut bilaterally.

[Effect of the sympathetic nervous system in regulating heart rhythm during burst stimulation of the vagus nerve]. / Vliianie simpaticheskoi nervnoi sistemy na upravlenie ritmom serdtsa pri zalpovom razdrazhenii bluzhdaiushchego nerva.

In cat experiments, the right inferior cardiac nerve was stimulated at a frequency of 2 and 4 Hz and the right vagus by bursts of 1, 2, 4, 8 and 16 impulses. Stimulation of the inferior cardiac nerve shifted the ranges of the heart rate control up the frequency scale. The shift of the range boundaries was mainly determined by the intensity of sympathetic regulation and by the number of impulses in a burst which stimulates the vagus nerve.