Selected cardiac abnormalities in Trypanosoma cruzi serologically positive, discordant, and negative working dogs along the Texas-Mexico border

Table 1 Anatomic level (atria, AV node, or ventricle) and presence of arrhythmias and conduction abnormalities found in T. cruzi positive, discordant and negative government working dogs

		Atria			AV node		Ventricle
Infection Status	Dog #	Supraventricular premature contractions	Supraventricular Tachycardia	Sinus Arrest (pauses > 4 s)	First-degree AV Block	Second-degree AV Block	Ventricular Tachycardia	VPCs/24 h	Modified Lown Score for ventricular arrhythmias
Positive (n = 17)	238	X						0	0
	369				X			0	0
	200			X				0	0
	62			X				0	0
	159	X						3	1
	53				X			5	2
	203							11	4
	105	X	X					12	1
	60							38	1
	153	X			X			79	2
	65						X	691	5
	92					X	X	1163	5
	64							6594	2
Discordant (n = 4)	234	X		X				0	0
	2					X		0	0
	198							25	1
	227							286	2
Negative (n = 18)	54			X				0	0
	94							1	1
	530							1	1
	16							3	1
	193							4	1
	258				X	X		762	5

*16 dogs are not displayed on the table because they had 0 VPCs and no apparent abnormalities in the 24 h monitoring. This includes 4 positive dogs and 12 negative dogs

ISSN: 1746-6148