From a The Telegraph online article:

A new study (in The Lancet, Aug 16, 2019) reveals that pensioners who have an operation have a one in 14 chance of suffering a silent or “covert” stroke – an event that shows no obvious symptoms but can damage the brain.

More than 1,100 patients across the world were given MRI scans nine days after some form of major non-cardiac surgery.

They were then followed up a year later to assess their cognitive abilities.

The researchers found that not only did having a silent stroke double the chances of cognitive decline a year on, it also increased the chances of a full life-threatening stroke.

Suffering a mini-stroke increased the risk of experiencing postoperative delirium as well.

The Lancet Study: https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(19)31795-7/fulltext?utm_campaign=clinical19&utm_content=98869259&utm_medium=social&utm_source=twitter&hss_channel=tw-27013292

To read more click on the following link: https://www.telegraph.co.uk/science/2019/08/15/silent-stroke-risk-major-surgery-revealed-new-study/