Scientists have conducted long-term monitoring of elderly people hospitalized with myocardial infarction, and made analysis of indices of short - and long-term mortality in this disease. In total in research took part 57574 people with body weight above normal.

In patients hospitalized due to myocardial infarction and low body mass index (BMI), more often than people with normal BMI, mortality was observed after 30 days and a year, five, seven, and 17 years after diagnosis of myocardial infarction.

Amendment to other diseases (e.g., cancer and chronic liver disease), limited mobility, brittle bones and other factors have not changed: patients with poor BMI had a 13 percent higher chance of dying after 30 days and 26 percent — through 17 years of age than older people with normal BMI. In case of comorbidity the patient was found, his lack of BMI increased the risk of dying in 17 years by 21 percent.

Increased risk of mortality of elderly patients with a low BMI, scientists have been known earlier. In this study, the authors first showed that death can be triggered by factors associated with low BMI and not other indicators. Researchers recommend that people who have suffered a myocardial infarction and having insufficient BMI, gain weight.

BMI is defined as the ratio of body weight (in kilograms) by the square of body length (in metres). For example, with a body weight of 67 kg and height 1.7 m BMI is 23. The norm is a BMI of equal to 18,5—24,99. The index below 18.5 is talking about the underweight, above 25 is about its abundance.