David Crosby underwent a cardiac catheterization on Friday following a routine cardiac stress test.

His left anterior coronary artery was found to be 90 percent blocked, and two stents were placed to improve blood flow to his heart. It is a routine procedure, and he is expected to make a full recovery. Crosby’s spokesman says he did not have a heart attack, though it is certain that he was at risk for one had he not followed his doctor’s advice.

Crosby, who was on tour in support of his new album, Croz, says, “I am very glad that I listened to my doctors and my family. It seems I am once again a very lucky man. I’m sorry to have to move the dates, but I promise the music will be good when we do play them.”

He was scheduled to play this Thursday and Friday at the Great American Music Hall in San Francisco. Those dates have now been rescheduled for April 20th and 21st. The five sold-out shows at the Troubadour in West Hollywood, California scheduled for February 23rd through the 28th will also be rescheduled in April. The Crosby, Stills and Nash tour in March will go on as planned.

So far the closest the tour will be to Detroit is Battle Creek Michigan at the Firekeepers Casino and Event Center on March 15th.