"Alert Music confirms that Kim Mitchell had a heart attack in the early morning of January 12th," read the official statement on Mitchell's Facebook page.

"After successful emergency surgery, Kim is resting in hospital for another day or two. Doctors tell him it will be 6-8 weeks before he is back to full strength. Kim would like to thank the nurses and doctors at St. Joseph's and St. Michael's hospitals."

Max Webster delivered five studio albums and countless Canadian rock radio classics - including "Battlescar" with Rush - before disbanding in 1981, with the guitarist moving on to a solo career.