McAmmond left the game with a concussion after he was sent to the ice by a flying body check from Philadelphia prospect Steve Downie.
The 13-year veteran did not move his hands or his feet while he was fully strapped onto the stretcher and taken off the ice. A team spokesman confirmed he had suffered a concussion, and subsequently moved his extremities, and was taken to a hospital for further evaluation.
McAmmond, who missed the final two games of last spring's Stanley Cup final against Anaheim after he suffered a concussion when he was elbowed in the head by Ducks defenseman Chris Pronger and knocked out of Game 3.
Eaves set up Joe Corvo's goal at 7:30, which tied it at 2, and then assisted on Jason Spezza's tally with 43 seconds left in the second period.
Ray Emery stopped seven of nine shots in his first appearance since Game 5 of the Stanley Cup final last spring. Emery, who started each of Ottawa's 20 playoff games, played the first two periods in his return from offseason surgery on his left wrist.