Dear Mrs, If he has a possitive stress test for ischemia, it means that one of the vessels with supply blood to heart is narrowed. It is not very common in his age, but possible. The risk of this disease is that such patients can develop a heart attack. The next step should be coronary angiography, it is an examination, when heart arteries are imaged, it will show the exact vessel and the percentage of narrowing. And if there is a need doctors may intervene and open the vessel with stent. His doctor will prescribe him medications to prevent further blockages and he should follow healthy lifestyle: avoid food containing animal food, not to smoke and drink much alcohol and exercise much. Hope this was helpful for you Wishing a good health to your husband Come back if you have any further questions