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Cardiac pathology – Pathoma . QUESTIONS WITH VERIFIED ANSWERS. A+ GRADED. How much of the vessel must be occluded before stable angina occurs? 70% How does a stable angina patient present? Chest pain <20 minutes, radiates to jaw, diaphoretic, SOB What is seen on EKG when there is subendocardial ischemia? ST-segment depression Why does nitroglycerin relieve chest pain associated with ischemia? Dilates veins which decreases preload which reduces cardiac output which reduce...