'Supernormal' phase in hemiblock conduction.
نویسنده
چکیده
A case is described where the basic sinus rhythms is associated with an advanced degree of left anterior hemiblock. The rhythm is complicated by atrial extrasystoles, associated with a lesser degree of left anterior hemiblock. This paradox of 'supernormality' is explained on a critical interplay of differential refractoriness within the divisions of the left bundle-branch.
منابع مشابه
The supernormal phase of intraventricular conduction.
The supernormal phase of conduction is a short period of paradoxically improved conduction which may occur during an early phase of the recovery cycle of cardiac conducting tissue. The situation is paradoxical, for the improved conduction occurs during a short critical early period, while later impulses are blocked or have greater conduction delays. The term is, in a sense, a misnomer since con...
متن کاملSupernormality in Bachmann's bundle. An in vitro and in vivo study in the dog.
A supernormal phase of conduction between right and left atria was observed in the exposed hearts of anesthetized dogs. Interatrial conduction time of premature atrial responses was reduced by as much as 17% during the early phase of diastole, relative to the conduction interval of basic driven responses. The supernormal phase lasted from 60 to 140 msec and was greater at slower basic driving f...
متن کاملSupernormal conduction in the accessory pathway of patients with overt or concealed ventricular pre-excitation.
It was recently shown that supernormal conduction in the diseased His-Purkinje system is more common than previously thought, and is always associated with prolongation of refractoriness. To assess whether supernormal conduction could also occur in the accessory pathway of patients with ventricular pre-excitation, 21 patients with manifestly prolonged refractoriness in the accessory pathway wer...
متن کاملDouble irregular ventricular parasystole: rate-dependent entrance block and "supernormal" exit conduction.
An analysis of electrocardiograms from a patient with spontaneous double irregular ventricular parasystole is presented. Irregularity in one of the two parasystoles was produced by intermittence based on rate-dependent (phase 3) entrance block, and in the other parasystole it was attributed to "supernormal" exist conduction. Critical analysis of electrocardiograms revealed that first degree blo...
متن کاملSupernormal phase of AV conduction. A study during heart block and endocardial pacing.
A distinct, well-defined phase has been identified in a patient with heart block during which sinus impulses were conducted to the ventricles. This phase persisted during pacing but its onset and termination were delayed. No significant difference was found at varying pacing rates. On four occasions while pacing, two consecutive sinus impulses were conducted to the ventricles but this was not s...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- British heart journal
دوره 38 2 شماره
صفحات -
تاریخ انتشار 1976