Before revision: Heart-Lung Machine with rotating disc oxygenator Early operating theaters in an educational setting had raised tables or chairs at the center for performing operations surrounded by steep tiers of standing stalls for students and other spectators to observe the case in progress.
After revision: ModernHeart-Lung Machine with rotating disc oxygenator Early operating theaters in an educational setting had raised tables or chairs at the center for performing operations surrounded by steep tiers of standing stalls for students and other spectators to observe the case in progress.