A 100-gram serving of raw spinach contains 2.71 mg of iron, whereas cooked spinach contains 3.57 mg. Keep in mind that iron absorption is influenced by how much iron you already have in your body and by other nutrients that you eat with your meals.
Cardiac catheterization is an invasive test performed by a cardiologist, where a catheter is threaded into the coronary arteries (those arteries that supply the heart muscle with blood) through the femoral artery in the groin, the radial artery in the wrist, or the brachial artery in the elbow.
Doctors often use these types of tests to diagnose a heart attack and choose the best treatment. 1  Blood tests. During a heart attack, heart muscle cells die and burst open. 2  Coronary angiography (an-jee-OG-ra-fee), or angiogram. This test takes pictures of a dye flowing through your blood vessels.