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# TIMI (Thrombolysis in Myocardial Infarction) Risk Index Score Calculation

## TIMI Risk Index Score Calculation - Example, Formula

##### Definition:

TIMI (Thrombolysis in Myocardial Infarction) Risk Index is an easy bedside score that calculates 30-day mortality in ST-elevation myocardial infarction (MI) patients.

##### Formula:
TIMI Risk Index = heart beat x (age / 10)2 / systolic BP
##### Example :

A 65 year old lady wants to find her TIMI risk index. Her heart beat is 72 beats per minute and her systolic blood pressure is 160 mm Hg. Calculate TIMI risk index for her.

##### Given
,

Age = 65 Heart beat = 72 Systolic BP = 160 mm Hg

##### To Find,

TIMI risk index (Thrombolysis in Myocardial Infarction)

##### Solution

Substitute the given values in the formula,

 TIMI Risk Index = heart beat x (age / 10)2 / systolic BP = 72 x (65 / 10)2 / 160 = 72 x 6.52 / 160 = 72 x 42.25 / 160 = 3042 / 160 = 19.0125 = 19

If TRI < 30, then Low TRI i.e, In-hospital mortality ~ 10% or less If TRI > 30, then Intermediate / High TRI i.e, In-hospital mortality > 10% The risk index value is 19 i.e. < 30.Therefore, the patient is in In-hospital mortality ~ 10% or less

##### TIMI (Thrombolysis in Myocardial Infarction) Risk Index Table
Risk indexRisk groupRisk of death
24 hrIn-hospital30 days
≤12.510.20.60.8
>12.5 - 17.520.41.51.9
>17.5 - 22.531.03.13.3
>22.5 - 3042.46.57.3
>3056.915.817.4