Intracardiac electrophysiological conduction parameters in adult dogs

Figures & data

Table 1. The mean values and range of electrophysiological parameters in the current study based on the examination of all 22 dogs. All the parameters are expressed in milliseconds (ms).

Parameter	Mean	Minimum	Maximum
PA	10	6	17
AH	55	40	83
HV	34.5	22	54
SNRT	581	414	734
CSNRT	60	17	128
HRA-LA	39.5	13	46
HRA-LA 150	45.5	22	77
LA-HRA 150	49	21	74
AV Wenckebach	220	180	290
VA Wenckebach	360	260	430
AERP	130	80	170
AERP 130	130	110	180
AERP 150	130	110	180
AVNERP	150	120	200
AVNERP 130	155	110	220
AVNERP 150	155	110	210
VERP	150	130	180
VERP 130	160	140	210
VERP 150	160	140	180
VERP 180	150	130	220

Notes: PA, the interval between the onset of the P wave and the intrinsic deflection of the atrial electrogram on the bundle recording catheter; AH,-interval between the intrinsic deflection of the atrial electrogram and the earliest onset of the His potential; SNRT, sinus node recovery time; CSNRT, corrected sinus nod e recovery time; HRA-LA, interatrial conduction time from the high right atrium to the distal coronary sinus; HRA-LA 150, interatrial conduction time at an imposed rhythm of 150 beats per min; LA-HRA 150, retrograde interatrial conduction time from the distal coronary sinus to the high right atrium at an imposed rhythm of 150 beats per min; AV Wenckebach, ventricular pacing rate at which the loss of 1:1 atrioventricular conduction occurs; VA Wenckebach, ventricular pacing rate at which the loss of 1:1 ventriculoatrial conduction occurs; AERP, atrial effective refractory period at an own rhythm, AERP 130, 150, atrial effective refractory period at an imposed rhythm of 130 beats per min and 150 beats per min; AVNERP, atrioventricular nodal effective refractory period at an own rhythm; AVNERP 130, 150, atrioventricular nodal effective refractory period at an imposed rhythm of 130 beats per min and 150 beats per min; VERP, ventricular effective refractory period at an own rhythm; VERP 130, 150, 180, ventricular nodal effective refractory period at an imposed rhythm of 130 beats per min, 150 beats per min, and 180 beats per min.

Table 2. Table indicating the 95% CI of electrophysiological parameters for the Group 1 (6 Beagles), Group 2 (16 admitted dogs), and Group 3 (all examined dogs). All the parameters are expressed in milliseconds (ms).

Parameter	Group 1, n = 6	Group 2, n = 16	Group 3, n = 22
PA	9–11	9–14	9–13
AH	53–62	51–65	53–63
HV	34–37	30–37	31–36
SNRT	531–652	535–624	540–620
CSNRT	43–81	53–74	54–75
HRA-LA	28–33	27–37	28–35
HRA-LA 150	41–50	42–59	43–56
LA-HRA 150	43–52	45–63	46–59
AV Wenckebach	215–238	209–245	213–239
VA Wenckebach	299–386	341–381	323–373
AERP	120–151	120–144	125–146
AERP 130	132–150	121–141	127–143
AERP 150	124–152	118–139	124–141
AVNERP	141–176	134–152	136–155
AVNERP 130	151–188	140–175	145–173
AVNERP 150	150–190	135–172	139–169
VERP	141–162	137–155	142–158
VERP 130	155–175	159–177	161–175
VERP 150	149–166	150–165	153–166
VERP 180	140–165	142–165	145–163

Notes: PA, the interval between the onset of the P wave and the intrinsic deflection of the atrial electrogram on the bundle recording catheter; AH, interval between the intrinsic deflection of the atrial electrogram and the earliest onset of the His potential; SNRT, sinus node recovery time, CSNRT, corrected sinus nod e recovery time; HRA-LA, interatrial conduction time from the high right atrium to the distal coronary sinus; HRA-LA 150, interatrial conduction time at an imposed rhythm of 150 beats per min; LA-HRA 150, retrograde interatrial conduction time from the distal coronary sinus to the high right atrium at an imposed rhythm of 150 beats per min; AV Wenckebach, ventricular pacing rate at which the loss of 1:1 atrioventricular conduction occurs; VA Wenckebach, ventricular pacing rate at which the loss of 1:1 ventriculoatrial conduction occurs; AERP, atrial effective refractory period at an own rhythm, AERP 130, 150, atrial effective refractory period at an imposed rhythm of 130 beats per min and 150 beats per min; AVNERP, atrioventricular nodal effective refractory period at an own rhythm; AVNERP 130, 150, atrioventricular nodal effective refractory period at an imposed rhythm of 130 beats per min and 150 beats per min; VERP, ventricular effective refractory period at an own rhythm; VERP 130, 150, 180, ventricular nodal effective refractory period at an imposed rhythm of 130 beats per min, 150 beats per min, and 180 beats per min.

Table 3. Comparison of selected electrophysiological parameters determined in various studies by their ranges as minimum and maximum values.

Parameter	Present study	Wright et al. (1996)
PA (ms)	6–17	0–30
AH (ms)	40–83	54–116
HV (ms)	22–54	30–44
SNRT (ms)	414–734	480–1710
CSNRT (ms)	17–128	20–488
AV Wenckebach (ms)	180–290	180–540
VA Wenckebach (ms)	260–430	280–510
AERP (ms)	80–170	110–210^a
AVNERP (ms)	120–200	150–300^a
VERP (ms)	130–180	150–240^a

^aDetermined at a 450-ms cycle length.

Notes: PA, the interval between the onset of the P wave and the intrinsic deflection of the atrial electrogram on the bundle recording catheter; AH, interval between the intrinsic deflection of the atrial electrogram and the earliest onset of the His potential; HV, the interval between the intrinsic deflection of the His potential and the earliest onset of ventricular activation on the intracardiac electrogram; SNRT, sinus node recovery time; CSNRT, corrected sinus nod e recovery time; AV Wenckebach, ventricular pacing rate at which the loss of 1:1 atrioventricular conduction occurs; VA Wenckebach, ventricular pacing rate at which the loss of 1:1 ventriculoatrial conduction occurs; AERP, atrial effective refractory period at an own rhythm; AVNERP, atrioventricular nodal effective refractory period at an own rhythm; VERP, ventricular effective refractory period at an own rhythm.

Wright KN, Hines DA, Bright JM. 1996. Cardiac electrophysiologic measurements in dogs before and after intravenous administration of atropine and propranolol. Am J Vet Res. 57:1695–1701.

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