Preoperative Assessment of Cardiac Risk Before Major Vascular Surgery (Clinical-Thallium Index)

The Clinical-Thallium Index Score is used to predict the likelihood of a post-operative cardiac ischemic event.

The Clinical-Thallium Index Score is based on the presence or absence of 7 predictors:

(1) age:

(2) history of angina:

(3) Q wave on ECG:

(4) history of ventricular ectopic activity:

(5) diabetes:

(6) ischemic ECG changes during dipyridamole infusion:

(7) redistribution of thallium:

Parameter	Finding	Value
age		(0.077* (age)) - 10
history of angina	present	+1.0
	absent	0
Q wave on ECG	present	+ 1.4
	absent	0
history of ventricular ectopic activity	present	+ 1.2
	absent	0
diabetes mellitus	present	+1.0
	absent	0
ischemic ECG changes during dipyridamole infusion	present	+1.3
	absent	0
redistribution of thallium	present	+2.3
	absent	0

clinical thallium index score =

= SUM(values for all 7 parameters)

probability of a cardiac ischemic event =

= (e^(score)) / (1 + (e^(score)))

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