Esteban is sitting around wishing he was Milo Ventimiglia when his wife comes rushing out on a stretcher with a team of people doing CPR on her. Nobody will tell him anything more than that her heart stopped.
So Esteban shows up at House's office (no doubt having gotten directions from Foreman), and House mistakes him for a janitor and says he can vacuum the floor later. And this is how House gets Sirhaned by yet another angry husband in yet another season finale. Not really. Esteban just asks what happened to his wife. House doesn't know and doesn't want to talk to people who don't speak perfect English, because he's an asshole. I hope next time his leg has a blood clot in it, he's stuck in a non-English speaking country where the doctors laugh at him for not knowing their language instead of treating him. Esteban desperately says that he risked his life to see House after looking him up and seeing that after every other doctor gave up, House fixed people. He's the only person who can save Marina, but he's just ignoring her and making fun of Esteban. "How do you fix something if you don't look at it?" Esteban asks. This gives House an idea. He leaves Esteban standing in his office. Maybe Esteban will do some vacuuming while he's there.
House walks into the OR while they've got Marina's chest open to hook her up to the bypass machine. House asks to see her heart, being uncharacteristically careful to observe sterile procedures while doing so. But, like the surgeon, he can't see anything physically wrong with it. He tells the surgeon to "give her a jump start" and someone hands the guy some electric salad tongs. He zaps the heart a bunch of times, but nothing happens. The surgeon pronounces the heart unstartable, saying it doesn't matter why it can't start. It does to House. The surgeon says they'll keep Marina on bypass so her husband can say goodbye. They won't, apparently, bother to close her up, as everyone just walks away from the table while Marina's chest is still open.