DIAGNOSIS: Sinus rhythm at a rate of 79 beats/minute with 2:1 second degree atrioventricular (AV) block and ventriculophasic sinus arrhythmia.
(1) Ventriculophasic sinus arrhythmia may occur with various forms of AV block, but is most typically seen with 2:1 AV block.
Heart rate turbulence (HRT) expresses ventriculophasic
sinus arrhythmia and has been considered to reflect cardiac autonomic activity.
HRT expresses ventriculophasic
sinus arrhythmia, i.e., the early acceleration and the late deceleration of sinus rhythm after single VPB (ventricular premature beat), and it is considered to reflect autonomic nervous system function.
(1) occult 2:1 A-V block in which an idioventricular beat "retracts" an otherwise refractory barrier within the A-V node; (2) alternation between dissociated intranodal transmission pathways; and (3) "ventriculophasic
" (vagal) depression of nodal conductivity.
(1) occult 2:1 A-V block in which an idioventricular beat 'retracts' an otherwise refractory barrier within the A-V node; (2) alternation between dissociated intranodal transmission pathways; and (3) 'ventriculophasic
' (vagal) depression of nodal conductivity." (6)
DIAGNOSIS: Sinus rhythm with monomorphic ventricular bigeminy and ventriculophasic sinus arrhythmia.
This ventriculophasic sinus arrhythmia often is most clearly seen in electrocardiograms showing sinus rhythm with 2:1 atrioventricular block but may be seen in any situation in which some sinus P-P intervals contain QRS complexes, while others do not.