Table 3.

Outcome by Event Characteristics and Clinical Testing

	All Patients (n=106)	No Appropriate Shock (n=86)	Appropriate Shock (n=20)	P-Value
SCA Event Characteristics, n (%)
Event Therapy
CPR only	15 (14)	13 (15)	2 (10)
CPR and defibrillation	87 (82)	69 (80)	18 (90)	0.67
Unknown	4 (3.8)	4 (4.7)	0 (0)
Event Rhythm*
Ventricular Fibrillation	77 (73)	65 (76)	12 (60)	0.17
Monomorphic VT	6 (5.7)	3 (3.5)	3 (15)	0.08
Polymorphic VT	9 (8.5)	6 (7)	3 (15)	0.37
Torsades	7 (6.6)	6 (7)	1 (5)	0.99
Unknown	12 (11)	9 (11)	3 (15)	0.69
Clinical Testing Prior to Implant, n (%)
EP study (y/n)	29 (27)	21 (24)	8 (40)	0.17
Positive EP Study	4 (3.8)	4 (4.7)	0 (0.0)	0.61
Exercise Study (y/n)	26 (25)	21 (24)	5 (25)	0.99
Positive Exercise Study	5 (4.7)	2 (2.3)	3 (15)	0.05
Abnormal/Positive ECG	41 (39)	39 (45)	2 (10)	0.004
Cardiac Function (prior to implant), n (%)
Normal (> 55%)	86 (81)	68 (79)	18 (90)	0.17
Mild Dysfunction (45 – 54%)	11 (10)	11 (13)	0 (0.0)
Moderate Dysfunction (35 – 44%)	4 (3.8)	4 (4.7)	0 (0.0)
Severe Dysfunction (< 35%)	2 (1.9)	1 (1.2)	1 (5)
Cardiac Function (Time of study), n (%)
Normal (> 55%)	91 (86)	75 (87)	16 (80)	0.49
Mild Dysfunction (45 – 54%)	5 (4.7)	3 (3.5)	2 (10)
Moderate Dysfunction (35 – 44%)	2 (1.9)	2 (2.3)	0 (0.0)
Severe Dysfunction (< 35%)	0 (0)	0 (0)	0 (0.0)

SCA – sudden cardiac arrest; EP – electrophysiology; CPR – cardiopulmonary resuscitation; P-value for or Fisher’s exact test.