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Normal Heart Sounds With the aid of a stethoscope you can hear the characteristic sounds of the normal heartbeat, typically described as a "lub-dub." These sounds are produced by the closure of the heart valves. The first heart sound or "lub" results from closure of the tricuspid and mitral valves. It is a rather low-pitched and a relatively long sound which, as indicated in, represents the beginning of ventricular systole. The second heart sound, or "dub," marks the beginning of ventricular diastole. It is produced by closure of the aortic and pulmonary (pulmonic) semilunar vanes when the intraventricular pressure begins to fall. This "dub" sound is typically heard as a sharp snap because the semilunar valves tend to close much more rapidly than the AV valves. Because diastole occupies more time than systole, a brief pause occurs after the second heart sound when the heart is beating at a normal rate. Therefore, the pattern that one hears is one of: "lub-dub" pause, "lub-dub" pause, and so on. Sometimes, especially in young normal individuals, a third heart sound can be heard. This sound is produced by the very rapid influx of blood into the partially filled ventricle. It is typically very faint and as such difficult to hear.
A video-animation presentation about sentinel lymph node biopsies for breast cancer diagnosis. 3D graphics are used to explain the process. Topics include the lymphatic system and the methods used. This video is part of the breast cancer education series produced by CancerQuest at Emory University
Another video of Dr.Vijay C. Bose from Apollo Speciality Hospital chennai perform Birmingham Hip Resurfacing Surgery procedure for a case of Avascular necrosis.The NCP ( Neck Capsule Preserving) approach is being used. Total hip replacement, hip resurfacing simply shaves and caps a few centimeters of bone within the joint. The bone-conserving approach of the Birmingham Hip Resurfacing System.
Vaccines are extremely safe. Adverse reactions are uncommon. The most common reaction is pain and swelling at the vaccine site, which is easily treated, and has no longterm problems. An allergic reaction to vaccines are rare. Dr. Michael Davis dispells this and other vaccine myths, including myths about autism and vaccines.