This is not the way to diagnose an aortic aneurysm.

Season 7, Episode 16: вЂOut of the ChuteвЂ™ A bull rider at a rodeo gets trampled, and House figures out he has an aortic aneurysm, and then proves it by cracking the patient's chest and increasing his blood pressure until blood spurts out.

Over the course of the series, Morrison awarded six F grades, including вЂKnown UnknownsвЂ™ Here are the others: House's writers had to combine them, and sometimes the medicine suffered badly. Runners Down: Writing about medicine is hard so is writing soap opera. There are no drugs that act as truth serums nor can an MRI really tell if a patient is lying, as occurs in the episode. The problem, Morrison writes, is that the symptoms donвЂ™t match oyster poisoning at all. In the end, she was poisoned by bacteria in oysters. One of his doctors gives the girl a drug to serve as a вЂњtruth serumвЂќ and insists sheвЂ™s been poisoned by a date-rape drug. He initially insists she has rhabdomyolysis, a disorder that results when muscle is damaged, leading to problems elsewhere in the body. The next day, one of them begins to have extreme swelling in her extremities, resulting in her being admitted to the hospital and seen by House.

Great high concept: two teenage girls manage to sneak into a rock band's after party.

The Worst: Season 6, Episode 6: вЂKnown UnknownsвЂ™ Season 1, Episode 17 A rising African-American politician appears to have AIDS, but doesnвЂ™t.Season 2, Episode 1: вЂAcceptanceвЂ™ An inmate on death row collapses while exercising House figures out that he has a rare tumor.

House figures out that both of them have a rare genetic condition called hereditary angioedema вЂ“ for reasons that involve a considerable ick factor.

Season 3, Episode 5: вЂFools For LoveвЂ™ A young wife goes into anaphylactic shock, a severe allergic reaction, while her husband is subduing a gunman.

Runners up: In digging through MorrisonвЂ™s blog archives, I could only find four cases where he gave an episode either an A or an A. But House figures out the real reason: BobвЂ™s wife has been slowly poisoning him with a gold-containing arthritis drug. The team diagnoses him with everything from ALS to a post-viral autoimmune reaction, in which his immune system, over-responding to infection, is attacking his body. A man, Bob, nearly suffocates when his tongue swells up during rough sex. This, Morrison says now, was absolutely the top House episode when it came to getting the medicine right. The Best: Season 2, Episode 15 'Clueless' Advice: click through to Polite Dissent, and read the reviews. Here, then, is a look at the most- and least-accurate House episodes, as rated by Morrison, with links to his reviews over at Polite Dissent. вЂњAn average House episode may rate a C,вЂќ he says, вЂњbut that is still miles above any other show out there.вЂќ He is as tough on House as House is on other doctors. Since sometime during season one he has rated each episode using academic-style A-F letter grades not only on its plot, but on the quality of its medicine. But how realistic was the medicine behind those adrenaline- and vitriol-drenched storylines? ThereвЂ™s really only one authority on that: Scott Morrison, a physician in OвЂ™Fallon, Illinois, (and, previously, in the Air Force) who has reviewed every single episode of House, M.D., on his blog, Polite Dissent.

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