James Robert Calvin M.D.

Introduction An unpleasant sensation of rapid breathing or difficulty breathing is known as breathlessness. People sometimes complain of feeling winded, puffed, or out of breath. Medically, it is called as dyspnea. Breathing may hurt and the person may feel tightness in the chest. It is normal to...

What are The Signs and Symptoms of Atrial Fibrillation?Atrial fibrillation also called A-Fib is a condition of the heart which causes irregular heartbeats or arrhythmia. It causes abnormal vibrations in the atria chamber of the heart and also the ventricle chamber. In a healthy human heart, the...

The New England Journal of Medicine recently published research linking height and coronary artery disease through the study of genetics. Doctors have known since the 1950s about the link between short stature and coronary artery disease, “but the reason behind this really hasn’t been completely...

IntroductionNicotine is an alkaloid stimulant that comes from the nightshade family of plants, particularly from the leaves of tobacco. The type of nicotine found in tobacco plants is called Nicotiana tabacum. Nicotine can also be synthetically produced. Thousands of chemicals are contained in...

Lupus is an unpredictable, multi-organ disease, and in some it may have milder course characterized by skin rashes or muscular aches, while in others it may start abruptly with predominant symptoms of some serious illness. It is not uncommon for lupus patients to present with the symptoms of kidney...

Do you want to know what Cardiac Resynchronization Therapy (CRT) is? Do you know exactly how your heart functions? It works in a rhythm. It beats 60 to 100 times per minute, and when it beats, it pumps oxygenated blood to your whole body. When the heart relaxes immediately after each beat, impure...