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.

Part 7: from Loyola Medical School, Chicago showing clinical examination of the neurological system.

Cushing Pattern Suture

Resection of a glioblastoma multiforme, a very malignant, aggressive brain tumor.

DMC Neurosurgeon Sandeep Mittal maps the brain and performs delicate surgery to remove epileptic tissue, and stop a patient's seizures. ~ Detroit Medical Center

Anterior Release Test

Kathleen Carr, MD performs a full shoulder exam for the musculoskeletal program at the University of Wisconsin Department of Family Medicine.

Spigelian Hernia on Ultrasound

Walk through your mouth with Intra Oral Technology and see the unseen! Most of us can't really see what is going on in our mouths because it is a very small, and shadowed area. What we don't know is that many situations and conditions in the mouth and painless and not always visible to the naked eye.

The Intra Oral Camera is a fascinating innovation in dentistry that allows the client and our clinicians to look deep into the mouth and observe the teeth at a very close angle. This wand like camera which transfers images to a television, can see so close to a tooth that it can see mini fractures, chips, secondary decay, wear down of the teeth, damaged and broken fillings and crowns and even gum disease. At Yaletown we believe that people can decide what is best for their own health. The Intra Oral Camera is a wonderful educational tool for clients so they can learn about their mouths to help them on their journey to overall dental wellness.

Clean hands can help prevent the spread of infectious diseases, such as flu. This podcast explains the proper way to wash your hands.

An Echocardiography showing an Acute Pulmonary Embolism

CDC's Dr. Joe Bresee describes how to prevent giving and getting novel H1N1 flu.

USMLE Step 2 CS - Pain Seeking This is just preview video. To get full access please visit our website : www.usmletutoring.com

Vaginal Hysterectomy using Thermal Hemostasis

Gleevecs mechanism of Action

Narcissistic Personality Disorder Information

Surgical Glove Flip How To

Congestive Heart Failure 3D Animation

How ESC therapy treats diseases?

How revolutionizing advancements helps patients with metastatic melanoma kick start the body’s immune system to increase survival.