transient ischemic attack: brief episode in which the brain gets insufficient blood supply; symptoms depend on the site of the blockage
ischemia: local anemia in a given body part sometimes resulting from vasoconstriction or thrombosis or embolism
titration: a measured amount of a solution of unknown concentration is added to a known volume of a second solution until the reaction between them is just complete; the concentration of the unknown solution (the titer) can then be calculated