Kiss lead singer Paul Stanley suddenly bowed out of a concert in California because of heart problems.
"During sound check yesterday, my heart spontaneously jumped to 190 plus beats per minute where it stayed for over an hour, necessitating paramedics to start an IV and give me a shot to momentarily stop my heart and get it into a normal pattern," Stanley said in a Saturday website posting.
"Not knowing if this episode was life-threatening made it even more exhausting."
The 55-year-old Stanley said he was advised performing would be risky.He finished his message by promising to make it up to Kiss fans.
Band members Gene Simmons, Tommy Thayer and Eric Singer went on to play the Friday night gig at a casino in San Jacinto, Calif., about 145 kilometres east of Los Angeles.
The band turned the performance into a tribute to their missing bandmate.
Fans were told Stanley was sick but were unable to find out what happened until Stanley's posting late Saturday.
Friday's performance marked Kiss's first ever appearance as a trio, according to the band's website.
The band, with its outlandish black leather costumes and makeup,was aglobal sensation during the 1970s with hits Rock and Roll All Nite, I Was Made For Lovin' You and Detroit Rock City.
Stanley, born Stanley Eisen, and Simmons co-founded Kiss in New York City in 1973. Original members Ace Frehley and Peter Criss have since left the band.