TABLE 4A.

Amplitude of Electrograms

Amplitude	Cases	Controls	P-Value
MI block + (13:15)
Mitral annulus	1.2 ± 0.7 mV	1.3 ± 0.7 mV	0.71
Mid mitral line	1.4 ± 0.2 mV	1.4 ± 0.6 mV	1.0
High mitral line	1.2 ± 0.4 mV	1.2 ± 0.6 mV	1.0
CS distal	1.5±0.6mV	1.1 ± 0.8 mV	0.15
MI block – (7:7)
Mitral annulus	1.3 ± 0.9 mV	0.9 ± 0.7 mV	0.37
Mid mitral line	1.6 ± 0.4 mV	1.9 ± 0.1 mV	0.08
High mitral line	1.7 ± 0.3 mV	1.4 ± 0.8 mV	0.37
CS distal	1.9 ± 0.9 mV	1.8 ± 1.6 mV	0.89

CS = coronary sinus; mV = millivolt.