In the study, doctors at the Belfast Health and Social Care Trust (UK) and the Royal College of Surgeons in Ireland (RCSI) analyzed data from more than 10,500 patients. All of them lived in Ireland, according to The Independent (UK).

Between 2013 and 2018, many people were hospitalized with ST-elevation myocardial infarction (STEMI). This is one of the most serious types of heart attacks. The person’s coronary artery becomes completely blocked. Without blood, part of the heart tissue begins to die.

The analysis found that STEMI heart attacks were more common on Mondays. Specifically, the risk of STEMI heart attacks on Mondays was 13% higher than normal. The study was presented at the British Cardiovascular Society (BCS) conference.

"We found a strong statistical correlation between the start of the work week and STEMI incidence," said study leader Dr. Jack Laffan.

Researchers still do not know the mechanism of this phenomenon. However, some hypotheses suggest that the cause is most likely related to   circadian rhythm   and the body's sleep-wake cycle.

Heart attacks are common, especially in older people. ST-elevation myocardial infarction (STEMI) is one of the most dangerous types of heart attack. In the UK, the British Heart Foundation (BHF) estimates that there are more than 30,000 hospital admissions due to STEMI each year.

Heart attacks require urgent assessment and treatment to minimise damage to the heart. Patients often need emergency angioplasty to reopen the blocked artery, according to The Independent .