The 34-year-old is now fundraising for the Heart Foundation's appeal, which is running this month.
He said he'd taken a first aid course recently where he learned CPR, how to use a defibrillator and how to stop people from choking.
"I'm really stoked that I've done it and now if something happened I'd still crap my pants but I'd have some knowledge," he joked.
Life is good. MacDonald is now working in marketing and rugby development for the union, and is back to playing touch and doing some exercises.
But, because of the implant, he will never play contact sport again.
MacDonald recently married teenage sweetheart, Michelle, mother of his young sons Iwi and Kade.
At the weekend, he met up with the paramedic who worked on him while spectators held their breath.
"It's one of those things. How do you thank someone who saved your life?"
In the MacDonald whanau the current joke among some of his bigger cousins is that it was his fitness that got him into trouble, he said.
But he wants more Kiwis to go and get their tickers checked because 5000 people die of heart disease each year.