title: False atrial dissociation (the Deitz-Marques phenomenon) and its dependence on dyspnea.
abstract: Three cases of false atrial dissociation (the Deitz-Marques phenomenon) were presented to show the dependence of this phenomenon on dyspnea. 2) The pseudo-P wave of the Deitz-Marques phenomenon coincided with the beginning of inspiration. 3) In a case of silicotuberculosis, the length of the pseudo-fibrillation was nearly equal to that of laborious inspiration. 4) In a case of aspiration pneumonia, every second cardiac contraction was synchronized with the beginning of inspiration two hours before death. 5) In a case of hyperpotassemia, the pseudo-P wave persisted even after the disappearance of the sinus P wave. 6) The pseudo-P wave was not affected by retrograde activation of the atria by the A-V junctional impulse.
mesh_terms: D000368:Aged; D002561:Cerebrovascular Disorders / Q000150:complications; D003937:Diagnosis, Differential; D004417:Dyspnea / Q000150:complications*; D004562:Electrocardiography; D006801:Humans; D006947:Hyperkalemia / Q000150:complications; D008297:Male; D008875:Middle Aged; D011015:Pneumonia, Aspiration / Q000150:complications; D012830:Silicotuberculosis / Q000150:complications