One of Pennsylvania's two artificial-heart recipients said he was "rooting" for the other as they waited for human transplants, hospital officials said yesterday.

Thomas J. Gaidosh, 47, who received a Jarvik-7 heart Thursday, remained in critical condition in Presbyterian-University Hospital of Pittsburgh following an "uneventful night," officials reported.

"We understand that the Gaidosh family is visiting him every two hours and that he is awake more and more," said hospital spokeswoman Isabelle Davis. "He can't speak because he still has mechanical assistance to breathe."

At the Milton S. Hershey Medical Center in Hershey, Anthony Mandia, who became the first person to receive the Penn State heart Oct. 18, wished Gaidosh good luck.

"When I told him Mandia of Mr. Gaidosh in Pittsburgh, he asked, 'How's his heart doing? Tell him I'm rooting for him,' " hospital spokesman Dr. John Burnside said.

Burnside said the Philadelphia recreation worker was eager for a change of scenery, asking for "a room with a view" and mentioning that he would like to go home to wait for a human heart.

Meanwhile in San Francisco, an artificial Thoratec heart has been attached to a northern California auto mechanic to support his failing heart while he awaits a donor organ, doctors said yesterday.

Richard E. Dallara, 33, of Sonoma, Calif., was considered hours away from death when he underwent a five-hour operation Friday at Pacific Presbyterian Medical Center.

Dallara's degenerated cardiac muscle remained inside his chest, but blood was being pumped through the otherwise nonfunctioning organ by the Thoratec heart, which has been used primarily in clinical research over the last decade.