Valves ;)

[Challiefan]

A mechanic was working on a top of the range Range Rover. He had the cylinder head off and was replacing a wonky valve when he spotted a famous cardiac surgeon on the other side of the workshop, whom he beckoned over. "Look," said the mechanic, "I open it up, replace a wonky valve, put it back together and it runs like new. Just the same as you do. So how come you get paid about a hundred times more that I do?".

The surgeon replied "Try doing it with the engine running."

Suddenly, I have a new found respect for heart surgeons - LOL.

[Cee-Cee1]

Thank you, Challiefan😂😅🤣

[beardy_chris]

Yes, I went to a lecture by an EP and he explained clearly how they go from the groin into the heart, across the atrium and do their stuff around the pulmonary artery. It all looked fairly straightforward until I realised the heart would be beating at the same time!