Ask the doctor: Why do I get chest pain when I don’t warm up before exercising?

I work out regularly, but suffer from exercise-induced angina. If I start exercising without warming up, my chest starts to feel “tight” quickly. If I warm up properly, I can walk for several miles at a pretty fast pace without any pain. Can you explain?

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Ask the doctor: Do I need to take precautions if I stop taking warfarin before a colonoscopy?

I am due to have a colonoscopy. My cardiologist told me that I will need to stop taking Coumadin, which I take for atrial fibrillation, a few days before the procedure and get some injections. Is that really necessary?

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Ask the doctor: Can I take PreserVision for my eyes even though I take warfarin?

I recently began treatment for macular degeneration in one eye. My retinologist said that PreserVision might protect the other eye. But she cautioned that it contains vitamin E, which could cause a bleeding problem with Coumadin. What would you suggest?

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