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The so-called 'male disadvantage' in severity of Covid-19 cannot solely be explained by pre-existing cardiovascular disease as other factors also contribute to heart disease severity, researchers now say.

Covid-19 is a deadly respiratory illness, but cardiovascular complications such as irregular heart beat (arrhythmia), lack of blood flow to the brain (stroke) and heart failure are also reported in some patients.

Men typically have worse outcomes from Covid-19 than women.

As pre-existing cardiovascular disease is a known risk factor for severe Covid-19, and has a higher incidence in men, it has been proposed as a possible explanation for these sex differences.

"Our research aimed to understand whether sex differences in Covid-19 severity --including risk of death -- and in cardiovascular complications, were explained by the higher prevalence of pre-existing cardiovascular disease in men compared to women," said Dr Carinna Hockham at The George Institute for Global Health, UK in partnership with Imperial College London.

The study, published in BMJ Medicine, analysed 11,167 patients who were hospitalised with Covid-19 between May 2020 and May 2021 across 13 countries.

The team found that 13 of every 100 women and 17 of every 100 men developed some form of cardiovascular complication during their hospital admission, representing a 30 per cent lower risk in women.

Arrhythmia was the most common cardiovascular complication, seen in 5 in every 100 women and 8 in every 100 men.

Other complications, such as cardiac ischaemia and pulmonary embolism, were less common.

Researchers found that differences between the sexes in rates of cardiovascular complications were evident regardless of whether they had pre-existing cardiovascular disease.

They argued that the results not only have implications for the overall understanding of sex differences in health and disease, but also demonstrate the critical importance of considering sex and gender differences across all aspects of human health.

"Further research is needed to better understand why men are at higher risk of severe Covid-19, including looking at whether the viral mechanisms differentially impact women and men," said Hockham.