We'd like to have an agent that we can inject at rest without having to put you on a treadmill that could actually [tell us] what happened five or eight hours or 30 hours ago.

Preferentially, as long as blood flows normal, the preferred fuel would be fatty acid. On the other hand, if you have decreased blood flow, the heart cleverly switches metabolism from fatty acid to sugar or glucose.

The beauty is that when blood flow returns back to [normal even though something is not quite right], the switch in metabolism persists. Therefore, we can image it much longer than what we could do [if we were just looking at blood flow].

It's a challenging differentiation whether the pain is really related to the heart or not.

We always had this window to try to get him fit with the maximum amount of rest we could afford before the tour. We were very happy with his progress, the little bit of soreness was predictable. It just got worse in the nets so we decided to inject his knee and hope it will make him all right for next week.

The rest of the impure blood was leaking through a hole in the heart to mix with purified blood making the entire circulatory system impure. The boy became bluish. It was one of the most challenging cases.