Based on gender and data collected during exercise testing, it is possible to predict the risk (low, intermediate, or high probability) of left main or triple-vessel coronary artery disease in a patient.
Variables:
(1) gender (male or female)
(2) distance of exercise-induced ST-segment depression ( < 1 mm, 1 mm, 2 mm)
(3) exercise ejection fraction (from 0.30 to 0.80)
(4) exercise ((heart rate) • (systolic blood pressure)) product (from 10,000 to 30,000)
Lines separate probability zones for left main or triple-vessel coronary artery disease:
(1) low probability
(2) intermediate probability
(3) high probability
Women with exercise-induced ST depression of < 1 mm
|
|
X in 1000s |
Y |
|---|---|---|
|
lower line, y or left intercept |
10 |
0.43 |
|
lower line, x or right intercept |
13.2 |
0.3 |
|
upper line, y or left intercept |
10.8 |
0.8 |
|
upper line, x or right intercept |
22.4 |
0.3 |
|
|
slope |
intercept |
|---|---|---|
|
lower line (high vs intermediate probability) |
-0.042 |
0.848 |
|
upper line (intermediate vs low probability) |
-0.043 |
1.268 |
Women with exercise-induced ST depression of 1 mm
|
|
X in 1000s |
Y |
|---|---|---|
|
lower line, y or left intercept |
10 |
0.71 |
|
lower line, x or right intercept |
19.9 |
0.30 |
|
upper line, y or left intercept |
17.0 |
0.80 |
|
upper line, x or right intercept |
28.6 |
0.30 |
|
|
slope |
intercept |
|---|---|---|
|
lower line (high vs intermediate probability) |
-0.041 |
1.116 |
|
upper line (intermediate vs low probability) |
-0.043 |
1.529 |
Women with exercise-induced ST depression of 2 mm
|
|
X in 1000s |
Y |
|---|---|---|
|
lower line, y or left intercept |
14 |
0.80 |
|
lower line, x or right intercept |
25.4 |
0.30 |
|
upper line, y or left intercept |
23.2 |
0.80 |
|
upper line, x or right intercept |
30 |
0.518 |
|
|
slope |
intercept |
|---|---|---|
|
lower line (high vs intermediate probability) |
-0.044 |
1.414 |
|
upper line (intermediate vs low probability) |
-0.041 |
1.761 |
Men with exercise-induced ST depression of < 1 mm
|
|
X in 1000s |
Y |
|---|---|---|
|
lower line, y or left intercept |
10 |
0.62 |
|
lower line, x or right intercept |
17.6 |
0.30 |
|
upper line, y or left intercept |
15 |
0.80 |
|
upper line, x or right intercept |
26.7 |
0.30 |
|
|
slope |
intercept |
|---|---|---|
|
lower line (high vs intermediate probability) |
-0.042 |
1.048 |
|
upper line (intermediate vs low probability) |
-0.043 |
1.442 |
Men with exercise-induced ST depression of 1 mm
|
|
X in 1000s |
Y |
|---|---|---|
|
lower line, y or left intercept |
12.07 |
0.80 |
|
lower line, x or right intercept |
23.9 |
0.30 |
|
upper line, y or left intercept |
21.2 |
0.80 |
|
upper line, x or right intercept |
30 |
0.453 |
|
|
slope |
intercept |
|---|---|---|
|
lower line (high vs intermediate probability) |
-0.042 |
1.309 |
|
upper line (intermediate vs low probability) |
-0.039 |
1.634 |
Men with exercise-induced ST depression of 2 mm
|
|
X in 1000s |
Y |
|---|---|---|
|
lower line, y or left intercept |
18.22 |
0.80 |
|
lower line, x or right intercept |
30 |
0.324 |
|
upper line, y or left intercept |
27.3 |
0.80 |
|
upper line, x or right intercept |
30 |
0.70 |
|
|
slope |
intercept |
|---|---|---|
|
lower line (high vs intermediate probability) |
-0.040 |
1.537 |
|
upper line (intermediate vs low probability) |
-0.036 |
1.795 |
Specialty: Cardiology
ICD-10: ,
