Hierarchy of supraventricular pacemakers
نویسندگان
چکیده
منابع مشابه
Hierarchy of ventricular pacemakers.
To characterize the pattern of pacemaker dominance in the ventricular specialized conduction system (VSCS), escape ventricular pacemakers were localized and quantified in vivo and in virto, in normal hearts and in hearts 24 hours after myocardial infarction. Excape pacemaker foci were localized in vivo during vagally induced atrial arrest by means of electrograms recorded from the His bundle an...
متن کاملDepression of escape pacemakers associated with rapid supraventricular rate in patients with atrioventricular block.
Intermittent failure of escape pacemakers to maintain an effective rate when the supraventricular rate was rapid was observed in three patients with complete, or high degree atrioventricular block. In two of these patients asystole or slowing of escape pacemaker rate to less than 20 per minute was reproduced by atrial pacing at rates from 125 to 150 per minute. We localized the site of the bloc...
متن کاملBiological Pacemakers
Genetically engineered pacemakers could be a possible alternative to implantable electronic devices for the treatment of bradyarrhythmias. The strategies include upregulation of beta adrenergic receptors, conversion of myocytes into pacemaker cells and stem cell therapy. Pacemaker activity in adult ventricular myocytes is normally repressed by the inward rectifier potassium current (I(K1)). The...
متن کاملChemical Pacemakers
1. Iron spicules found in the brains of general paretic patients are formed from endogenous brain iron normally present in another form. This supports our earlier view that the micro value of 16,000 obtained in advanced paretics for alpha brain wave frequencies as a measure of cortical respiration comes about from the slowing of an iron catalyzed link in cortical respiration such as would resul...
متن کاملMechanism of supraventricular parasystole.
Two patients with supraventricular parasystole (one atrioventricular and one auricular) are reported. In both patients, reentrant extrasystoles appeared to occur as the result of Mobitz type I second-degree entrance block. We believe that when a sinus impulse fell soon after the absolute refractory period of the pathway containing the parasytolic focus, it reached and discharged the focus after...
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ژورنال
عنوان ژورنال: The Journal of Thoracic and Cardiovascular Surgery
سال: 1980
ISSN: 0022-5223
DOI: 10.1016/s0022-5223(19)37721-9