Mark John Castellanet M.D.

A stent is an expandable metal tube that is used to treat weak arteries. These stents help in opening up arteries that are narrowed down by the accumulation of plaques. Implantation of the tube helps in reducing the constriction of blood flow in the affected region. The metal mesh is implanted...

The liver primarily produces cholesterol. Each day, it makes 1,000 mg of cholesterol. The cells lining the small intestine can also produce cholesterol. If the level of cholesterol in the body is low, it may mean that the body is producing low amounts of cholesterol and is going to shut down. In...

What is a bubble study?A bubble study is a type of echocardiogram, which is the ultrasound of the heart. An echocardiogram is done to visualize the heart and its surrounding areas. Better images of the heart can be produced when a “contrast” is used during the echocardiogram. In a bubble study,...

Atrial fibrillation is a condition that causes abnormal vibrations in the heart chambers. It leads to changes in the heartbeat ratesand the pulse. As a result, it may cause clotting of blood in the heart chambers. Such quivering sensations are mostly experienced in the atria and ventricle chambers...

Living with high blood pressure is never easy. You have to watch yourself constantly with the knowledge that your body is malfunctioning. Most of the people who are diagnosed with this condition become depressive and lose the will to live. You have to know that even if you are diagnosed with high...

High blood pressure or hypertension is a chronic condition that may lead to other complications, including organ damage, gradually over a period of time. The blood pressure may become very high and severe all of a sudden resulting in a condition referred to as hypertensive crisis. Hypertensive...