Quinine: Stereoisomer of quinidine: antimalarial agent (Fun fact: also prevents shivering. Next time you're cold, drink a Gin & Tonic!)
Quinidine: Stereoisomer of quinine: class Ia antiarrhythmic.
How do you tell the difference? Easy: be an alcoholic. That way, you know that you always order your G&T with gen-u-ine quinine. Ooooh look! It rhymes!
Here's my personal favorite mnemonic, ever (and I am not, by any means, a mnemonic person). 100% of the credit goes to Peas:
The 5 Right to Left Shunts (The T's):
0: Total Anomalous Pulmonary Venous Return (0 connections back from the lung)
1: Truncus Arteriosus (1 big-ass trunk)
2: Transposition of the Great Vessels (2 switched vessels)
3: Tricuspid Atresia (3 fused leaflets in the tricuspid valve)
4: Tetralogy of Fallot (c'mon, you should know these 4 cold by this point)
Last one, then I'm done, I promise. It's HARD to have Cardiomyopathy:
Hypertrophic: Basketball players who drop dead during a game.
Arrythmogenic: Right Ventricular Dysplasia. Thin-walled right ventricle.
Restrictive: sarcoid, amyloid, radiation, endocardial fibrosis (high eosinophil count for >6 months), hemochromatosis.
Dilated: Most common. The ABCCDs - Alcohol, Beriberi, Cocaine (don't smoke crack, kids!), Chagas, Doxorubicin.
First Aid Mnemonic That Sucked The Hardest Today: REd = REperfusion. Guys... this is like, the most basic of all pathology concepts. I believe I can safely say that this is not mnemonic-able (braces for hate mail).
I should mention that I always write in pencil in my book, unless I'm crossing out stupid mnemonics. That's done in black pen... with a vengeance.