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.
Your doctor will conduct further tests to confirm a cardiac tamponade diagnosis. One such test is an echocardiogram, which is an ultrasound of your heart. It can detect whether the pericardium is distended and if the ventricles have collapsed due to low blood volume.