P-wave dispersion represents a noninvasive ECG marker that may reflect the prolongation of intraatrial
and interatrial conduction time, as well as the discontinuous inhomogeneous propagation of sinus impulses.
Because prolongation of P wave duration shows left atrial expansion or prolongation of intraatrial
conduction as in our series it is an important substrate in the development of AF.
P-wave dispersion (Pd) is related to discontinuous inhomogeneous intraatrial
and interatrial sinusoidal stimulations and is defined as a difference between maximum P-wave duration (Pmax) and minimum P-wave duration (P min) (10).
Catheter ablation should also be considered in difficult cases of atrial flutter, intraatrial
reentry and automatic atrial tachycardia.
All of these are features of left atrial enlargement or intraatrial
Lengthening of intraatrial
conduction time in atrial fibrillation and its relation with early recurrence of atrial fibrillation.
By echocardiography, though it can be mistaken for a mass, LHAS is recognized by a characteristic bilobed (dumbbell) brightly echogenic enlargement of the intraatrial
reentrant tachycardia after palliation of congenital heart disease: characterization of multiple macroreentrant circuits using fluoroscopically based three-dimensional endocardial mapping.
Extramedullary hematopoiesis presenting as an intraatrial
mass in a patient with chronic myelogenous leukemia.
To the Editor: Intraatrial
reentry tachycardia (IART) has been reported to occur in 2% to 10% of Mustard and Senning patients at 10 years' follow-up.
He underwent the surgical resection of the intraatrial
membrane through the left atrium and closure of the atrial septal defect with a pericardial patch.
Electroanatomical studies have demonstrated that scar tissue in the crista terminalis and in the right atrium are not conductive, and that these scar tissues predispose intraatrial
reentrant tachyarrhythmias (8, 9).