People bear greater risks for stroke or myocardial infarction substantially if they have been elevated after suffering from a respiratory infection. This phenomenon is particularly prominent during the first 7 days of such elevation.

 Respiratory Infections

This was the major finding of a recent research study that was conducted to obtain possible results after monitoring specified case-controls. Tim Clayton and his colleague researchers at the ‘London School of Hygiene and Tropical Medicine, UK’, also published their research findings in the “European Heart Journal”.

“Even though the observed percentage of myocardial infarctions and stroke which resulted from respiratory infection is low, with less than 2% among cases, the absolute number of myocardial infarctions and stroke which could potentially be prevented is substantial, because these are common conditions,” says Tim Clayton in the research paper.

Tim Clayton and his team at “London School of Hygiene & Tropical Medicine, UK”, matched 11,155 myocardial infarction cases and 9208 stroke cases to an equal number of individuals representing different age, gender, primary care practice, and season.

It was observed during the study that the rate of respiratory tract infection was generally low, but was nevertheless higher among stroke cases in comparison to the individuals with a ratio of 0.7% to 0.4% in the period of 7 days preceding stroke, and with 1.1% to 0.7% for a period between 8 and 28 days before the event.

Results thus obtained indicated that this ratio was equal to a 1.92-fold increased risk for stroke within 7 days of a respiratory infection, after accounting for confounders, and a 1.76-fold increased risk for stroke at 8-28 days after infection.

Researchers also recorded a similar nature of relationship between respiratory infection and myocardial infarction.

Urinary tract infections occurred in 0.3% of stroke patients in the month preceding the event, compared with 0.1% of controls. This came out to be equal with an adjusted 2.67-fold increase in the risk for stroke within a period of 28 days of a urinary tract infection.

In contrast, urinary tract infections did not appear to increase the risk for myocardial infarction.

The researchers concluded with their observation and described these findings as “uncertain”. They argued that these results are based on only 30 stroke patients and 20 myocardial infarction patients with urinary tract infections.

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