On twitter, Gaga said
“I’ve been crying for hours, I feel like I let my fans down tonight. An hour before the show, I was feeling dizzy and having trouble breathing. Paramedics came to take care of me, and told me my heart-rate was irregular — a result of exhaustion and dehydration.
Can’t apologize enough for how sorry I am. I could hear my fans cheering from my dressing room, I begged everyone to let me go onstage. My stage has complicated mechanical elements, everyone was concerned I’d be in danger during the 2-hour show, since I had passed out earlier.
I am so devastated. I have performed with the flu, a cold, strep throat: I would never cancel a show just based on discomfort. I hope you can forgive me. I love my little monsters more than anything, you are everything to me. I will make-up the performance on Jan 26.”