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Description

Based on clinical data it is possible to predict the mortality rate for patients with acute myocardial ischemia. This is also referred to as the Acute Cardiac Ischemia Time-Insensitive Predictive Instrument (ACI-TIPI).


 

Parameters:

(1) age in years

(2) presenting systolic blood pressure

(3) "squared" presenting systolic blood pressure

(4) T waves

(5) Q waves

(6) initial heart rate and presenting systolic blood pressure

 

age

value

<=50

50

> 50 and < 80

age

>= 80

80

 

 

presenting systolic blood pressure

value

>= 175 mm Hg

175

< 175 mm Hg

systolic blood pressure

 

 

squared presenting systolic blood pressure

value

systolic blood pressure <= 80 mm Hg

36

systolic blood pressure > 80 and < 140 mm Hg

((140 - (SBP))^2) /100

systolic blood pressure >= 140 mm Hg

0

 

 

T-waves at least 2 contiguous leads

value

peaked T waves present

2

inverted T waves present

1

neither

0

 

 

Q-waves in at least 2 contiguous leads

value

Q waves anterior-lateral

2

Q waves anterior-septal

1

Q waves anterior

1

poor R wave progression

1

neither

0

 

 

initial heart rate and presenting systolic blood pressure

value

SVT present

0

heart rate < 110 mm Hg

0

systolic blood pressure <= 90 mm Hg

1

systolic blood pressure > 90 and <= 110 mm Hg

((SBP) - 70) / 20

systolic blood pressure > 110 and <= 140mm Hg

2

systolic blood pressure > 140 and <= 155 mm Hg

((155) - 70) / 7.5

systolic blood pressure > 155 mm Hg

0

 

 

variable

coefficient

intercept

-5.6769

age

0.0733

systolic blood pressure

- 0.0145

squared systolic blood pressure

0.0347

T-waves

0.6008

Q-waves

0.6453

initial heart rate

0.7683

 

beta value =

= (intercept coefficient) + ((age value) * (age coefficient)) + ((systolic blood pressure value) * (systolic blood pressure coefficient)) + ((systolic blood pressure squared value) * (systolic blood pressure squared coefficient)) + ((T wave value) * (T wave coefficient)) + ((Q wave value) * (Q wave coefficient)) + ((heart rate value) * (heart rate coefficient))

 

probability of death =

= 1 / (1 + EXP ((-1) * (beta value)))

 


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