Clinic : ` ` Rivers , 81 , died last Thursday in New York 's Mount Sinai Hospital , where she was rushed a week earlier after she stopped breathing and her heart stopped beating during treatment at Yorkville Endoscopy . A biopsy of the vocal folds has never been performed at ' Endoscopy '' Federal privacy laws limit what medical professionals can make public about patients . The clinic has state - of - the - art equipment and well - trained doctors , " , clinic says . Joan Rivers died a week after suffering cardiac arrest at the Manhattan clinic .
Clinic : ` ` A biopsy of the vocal folds has never been performed at ' Endoscopy '' Federal privacy laws limit what medical professionals can make public about patients . The clinic has state - of - the - art equipment and well - trained doctors , " , clinic says . Joan Rivers died a week after suffering cardiac arrest at the Manhattan clinic .