This was the second appeal of the suspension by Kadri after it was also upheld by NHL commissioner Gary Bettman late last month.
Kadri received the eight-game ban for a hit to the head of Blues defenceman Justin Faulk in Game 2 of the first-round series between Colorado and St. Louis. Faulk was forced to leave the contest and was sidelined the rest of the series due to an upper-body injury. The Avalanche defeated the Blues in four games to advance to Round 2.
Kadri has served six of the eight games of his suspension so far, with the Avalanche tied at two games apiece in their second-round series vs. Vegas Golden Knights heading into Tuesday's Game 5 at 9 p.m. ET / 6 p.m. PT on Sportsnet and SN Now.
Including this current infraction, Kadri has been suspended six times for a total of 16 playoff games and 11 regular season games.
Kadri has one assist in two games these playoffs.