PTSD usually develops in people who have experienced a traumatic or life-threatening event, including a health scare like a heart attack or catheterization. Symptoms of PTSD typically include anxiety, anger, and flashbacks or nightmares. PTSD symptoms are also associated with poor medical outcomes and nonadherence to medication after a heart attack. Fortunately, PTSD can sometimes be treated by antidepressants, anti-anxiety medication, and talk therapy. This study will compare the efficacy of cognitive-behavioral therapy (CBT) versus education and treatment as usual for treating people who are experiencing PTSD that is related to their cardiovascular illness (a heart attack or an invasive procedure such as catheterization).