This TIMI score calculator indexes the myocardial infarction mortality risk in acute coronary syndromes by patient heart rate, age and systolic blood pressure. Read more about the formula used and its interpretation below the form.
How does this TIMI score calculator work?
This is a cardiovascular health tool assessing the risk of myocardial infarction (MI), more specifically the 30 day mortality in ST-elevation myocardial infarction patients. It is based on a simple determination that takes account of the patient’s age, heart rate in beats per minute and systolic blood pressure in mmHg.
The Thrombolysis in Myocardial Infarction (TIMI) is part of an academic research group conducting clinical trials in patients with or at risk of developing cardiovascular disease. This particular study aims to determine the risk of death and ischemic events in patients with or without unstable angina and/or ST elevation MI or nonST elevation MI.
The formula used by this TIMI score calculator is explained below:
TIMI risk index = heart rate (bpm) x (age/10)2 /systolic BP (mmHg)
For example, taking in consideration the case of a patient aged 70, with a heart pulse of 75 bpm and systolic blood pressure 167 mmHg. The TIMI score becomes:
= 75 x (70/10)2 / 167
= 75 x 49 / 167
= 22
This score belongs to risk group III, mortality risk 1% in 24h, 3.1% in hospital and 3.3% in 30 days.
Acute coronary syndromes (ACS) and Myocardial infarction (MI)
The first is the term used for all conditions characterized by a sudden reduction in blood flow to the heart while the second is one the main conditions in which the heart function is impaired by this reduced flow in the coronary arteries.
ACS general symptoms that are also met during an MI include chest pressure, at rest or during light activities (unstable angina) and even the sudden stop of the heart (cardiac arrest).
Important to mention that if the symptoms belonging to the acute coronary syndrome are not recognized and treated, a heart attack can be imminent and life threatening. Other accompanying symptoms are left upper arm radiating pain, shortness of breath, heartburn, dizziness, nausea, vomiting or feeling restless.
Amongst the most common causes, the plaque buildup in the arteries to the heart, coronary atherosclerosis leads to the narrowing of the arteries and impairs normal blood flow.
The most common cardiovascular risk factors are similar to those in other heart diseases:
■ Age higher than 45 for men and 55 for women
■ High systolic blood pressure
■ High cholesterol
■ Lack of physical activity
■ Type 2 diabetes
■ Smoking
■ Family history
TIMI result interpretation
The result given after the above formula is employed will stratify the cardiovascular risk of the patient in one of the 5 risk groups and will award risk percentages in 24 hours, during hospitalization and in the following 30 days.
| Risk index | Risk group | Mortality risk | ||
| 24 hr | In-hospital | 30 days | ||
| <12.5 | I | 0.2 | 0.6 | 0.8 |
| 12.5 - 17.5 | II | 0.4 | 1.5 | 1.9 |
| 17.5 - 22.5 | III | 1 | 3.1 | 3.3 |
| 22.5 - 30 | IV | 2.4 | 6.5 | 7.3 |
| >30 | V | 6.9 | 15.8 | 17.4 |
References
1) Wiviott SD, Morrow DA, Frederick PD, Antman EM, Braunwald E, National Registry of Myocardial Infarction. (2006) Application of the Thrombolysis in Myocardial Infarction risk index in non-ST-segment elevation myocardial infarction: evaluation of patients in the National Registry of Myocardial Infarction. J Am Coll Cardiol; 47(8):1553-8
2) Morrow DA, Antman EM, Charlesworth A, Cairns R, Murphy SA, de Lemos JA, Giugliano RP, McCabe CH, Braunwald E. (2000) TIMI risk score for ST-elevation myocardial infarction: A convenient, bedside, clinical score for risk assessment at presentation: An intravenous nPA for treatment of infarcting myocardium early II trial substudy. Circulation; 102(17):2031-7.
01 Aug, 2015