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Updated: June 4, 2025
It is different from paroxysmal tachycardia, in which the heart rate rarely exceeds 180 per minute. In auricular flutter there is always present a certain amount of heart block, not all the stimuli reaching the ventricle. There may be a ratio of auricular contractions to ventricular contractions, according to Fulton, of 2:1, 3:1, 4:1 and 5:1, the 2:1 ratio being most common.
In the second type, where there was normal auricular activity, but where the ventricular contractions were decreased, atropin affected an increase in the number of ventricular contractions, but did not completely remove the heart block. He adopted atropin where the heart block was associated with auricular fibrillation.
When ventricular fibrillation occurs, the condition is serious and the prognosis bad. Both auricular fibrillation and auricular flutter may be temporary or permanent, and the exact number of fibrillations or tremblings of the auricular muscle can be noted only by electrical instruments.
Laryngeal examination showed that the fundamental tones were produced by vibrations of the edges of the vocal cords, and the modifications were effected by a minute adjustment of the ventricular bands, which regulated the laryngeal opening above the cord, and pressing firmly down closed the ventricle and acted as a damper preventing the vibrations of the cords except in their middle third.
The patient almost invariably must sit up, or at least have his head raised. The auricles of the heart may act more energetically than normal, and precede as usual the ventricular contraction; or the auricles and ventricles may contract almost together a so-called "nodal" type of contraction. Rarely does a patient die of paroxysmal tachycardia.
The wound of puncture was 5 cm. below the nipple and 2 cm. to the outside. The left side of the chest was emphysematous and ecchymosed. The heart-sounds were regular, and the elevation of the skin by the blade coincided with the ventricular systole. The blade was removed on the following day, and the patient gradually improved.
As for the particular fallacy contained in the theory of ventricular breath-control, that must be reserved for a later chapter. Suffice it to say here that this theory disregards the two basic mechanical principles of tone-production, Pascal's law, and the law of the conservation of energy.
In the ventricles, Lewis states, the Purkinje fibers act as the conducting agent, stimuli being conducted to all portions of the endocardium simultaneously at a rate of from 2,000 to 1,000 mm. per second. The ventricular muscle also aids in the conduction of the stimuli, but at a slower rate, 300 mm. per minute.
At other times he may be conscious of irregular, strong throbs or pulsations of the heart, as such hearts often give an occasional extra sturdy ventricular contraction. These he notes. Real attacks of tachycardia may be superimposed on the condition. Sooner or later, however, if the condition is not stopped, cardiac weakness and decompensation, with all the usual symptoms, occur.
It has also been shown that if for any reason this region of the right auricle is disturbed, a stimulus or impulse might come from some other part of the auricle, or even from the ventricle, or from some point between them. Such stimulations may constitute auricular, ventricular or auriculoventricular extra contractions or extrasystoles, as they are termed.
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