11.Guidelines for cardiopulmonary resuscitation and emergency cardiac care. Emergency Cardiac Care Committee and Subcommittees, American Heart Association. Part III. Adult advanced cardiac life support. JAMA 1992; 268:2199-2241.
12.Stwart RB, Bardy GH, Greene HL. Wide complex tachycardia: Misdiagnosis and outcome after emergent therapy. Ann Intern Med 1986; 104:766-771.
13.McGovern B, Garan H, Ruskin JN. Precipitation of cardiac arrest by verapamil in patients with Wolff-Parkinson-White syndrome. Ann Intern Med 1986; 104:791-794.
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23.Marriot’s practical electrocardiography, Galen S. Wagner, M.D., 1994.
Table 1 shows the prevalence of predominantly negative QRS complex in the 4 chosen leads in SVT vs VT.
Lead I |
Lead Ii |
Lead V1 |
Lead V6 |
|
VT SVT |
37 (66%) 0 (0%) |
40 (71%) 6 (24%) |
26 (46%) 16 (64.3%) |
40 (71%) 0 (0%) |
Table 2 shows a multiple logistic regression in a forward manner using lead I and II, as independent predictors
B |
R |
Significance |
|
Lead I Lead II |
-2.568 -1.878 |
-0.358 -0.26 |
<0.0001 <0.0024 |
Table 3 shows the Chi-square and P-value of each set of criteria when applied separately and compared to the final EPS diagnosis
Brugada (8) |
Camm group (21) |
The New criteria |
|
X2 |
24 |
35 |
58 |
P value |
0.0001 |
0.0001 |
0.0000 |
Table 4 shows the discriminative analysis of the three criteria
Brugada (8) |
Camm group (21) |
The New Criteria |
|
Sensitivity Specificity +ve predictive value -ve predictive value |
89.2% 68.4% 84.7% 76.7% |
82.1% 88% 93.8% 68.7% |
89.2% 100% 100% 80.6% |
Table 5 shows the sensitivity and specificity of the first two steps in Brugada algorithm
Absent RS |
RS intervals > 100 ms |
|
Sensitivity |
42.8% |
44% |
Specificity |
84% |
74% |
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