What is the life expectancy of an 87-YO woman with severe aortic stenosis of many years duration who elects not to have surgery and how quickly does the condition progress Her aortic valve is at .5 cm?

You can consult Death Tables for a general look at the life expectancy of a woman of 87- based on the "cohort" she was born in. A woman of that age probably has about a 5 year expectancy- however, many patients with grave coronary disease may not be likely to make that period. In many cases, the day before a patient like this dies they would be said to have a 50/50 chance of living 6 months- meaning that prediction is very difficult. Because medications can greatly improve heart function and patient comfort, and because surgery on elderly patients is a questionable practice- it is not unreasonable for this person to decline surgery.