Surgical risk for patients with Chagasic achalasia and its correlation with the degree of esophageal dilation

Table 7 Risk index for Chagasic achalasia

(a) Points
Achalasia	Points
Grade II	9
Grade III	13
Grade IV	17
Primary changes in ventricular repolarization	Points
Yes	15
No	0
Arrhythmias	Points
Yes	12
No	0
Functional class	Points
1	6
2	12
3	24
(b) Final index
Points	Risk level
Up to 21	Mild
From 22 to 34	Moderate
Above 34	High
(c) Probability of accuracy of the risk level
Risk levels	Probability (%)
Mild	82.4
High	94.6