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TTR measures how consistently a patient’s INR remains within goal, reflecting effectiveness and safety. Simply counting INR tests (A) or prescriptions (D) doesn’t reflect outcomes. Duration of therapy (C) depends on indication, not quality. TTR is the most clinically meaningful metric.

Amiodarone is incompatible with PVC containers and tubing due to adsorption and DEHP leaching, which reduces drug delivery and increases toxicity risk. It should be prepared in glass or polyolefin containers. Vancomycin, ceftriaxone, and piperacillin-tazobactam do not share this requirement. Recognizing special preparation requirements prevents treatment failure and patient harm.

Heart failure management requires evidence-based GDMT (ACEi/ARB/ARNI, beta-blocker, MRA, SGLT2i when appropriate). Measuring percentage of eligible patients on GDMT reflects adherence to guidelines. Prescription counts (B), clinic visits (C), or diuretic fills (D) do not confirm evidence-based therapy use.

Phenytoin commonly causes gingival hyperplasia through fibroblast stimulation. Risk increases with poor dental hygiene and higher doses. Valproic acid, levetiracetam, and carbamazepine are not associated with this effect. Patient counseling on oral hygiene reduces severity.

Clozapine carries a black box warning for agranulocytosis. Patients require ANC monitoring (weekly to monthly depending on duration). Risperidone, olanzapine, and quetiapine have lower hematologic risk. Agranulocytosis monitoring is critical to clozapine safety.