Two-to-one A-V block with four-to-three A-V nodal wenckebach, a form of spontaneous multilevel block.
Feldman R, Horowitz LN, Josephson ME. Two-to-one A-V block with four-to-three A-V nodal wenckebach, a form of spontaneous multilevel block. J Electrocardiol. 1978 Apr; 11(2):181-4.