Transthoracic tissue Doppler imaging of the atria to determine atrial fibrillation cycle length.
Bollmann A, Husser D, Stridh M, S?rnmo L. Transthoracic tissue Doppler imaging of the atria to determine atrial fibrillation cycle length. J Cardiovasc Electrophysiol. 2007 Mar; 18(3):E13-4.