With keratoconus, the clear, dome-shaped tissue that covers the eye (cornea) thins and bulges outward into a cone shape. Its cause is unknown. Symptoms first appear during puberty or the late teens and include blurred vision and sensitivity to light and glare. Vision can be corrected with glasses or contact lenses early on. Advanced cases may require a cornea transplant.

Cardiac catheterization (kath-uh-tur-ih-ZAY-shun) is a procedure used to diagnose and treat cardiovascular conditions. During cardiac catheterization, a long thin tube called a catheter is inserted in an artery or vein in your groin, neck or arm and threaded through your blood vessels to your heart. Using this catheter, doctors can then do diagnostic tests as part of a cardiac catheterization. Some heart disease treatments, such as coronary angioplasty, also are done using cardiac catheterization. Usually, you'll be awake during cardiac catheterization, but given medications to help you relax. Recovery time for a cardiac catheterization is quick, and there's a low risk of complications.

6 months old development

Surprising Facts About High Blood Pressure

Both lower extremities must be evaluated to determine the presence or extent of any disease and to ascertain the pulse status of the patient. The feet are examined for signs of peripheral vascular disease and the anterior and posterior tibial pulses are palpated. Because an intact arch can supply retrograde flow to the major vessels of the foot, it can be helpful to put pressure on the anterior tibial artery when detecting the presence of a posterior tibial pulse and visa-versa. This "modified Allen's test" may detect proximal vessel obstruction masked by an intact foot arch. The need for preoperative angiography in young, healthy patients with a normal physical examination has been hotly debated. Our tendency has been to obtain preoperative angiograms as a guide. Although rare, we have seen lower extremities with a dominant peroneal artery nourishing the foot and distal anterior and posterior vessels, contraindicating sacrifice of the peroneal artery. MRI or CT angiography can also be used in many circumstances.

This video may contain images of a medical doctor providing emergency care for a patient.

Using 3D animations we have come up with a new way of demonstrating how to perform portable ultrasound examinations

What is an Aneurysm? A cerebral or intracranial aneurysm is an abnormal focal dilation of an artery in the brain that results from a weakening of the inner muscular layer (the intima) of a blood vessel wall. The vessel develops a "blister-like" dilation that can become thin and rupture without warning. The resultant bleeding into the space around the brain is called a subarachnoid hemorrhage (SAH). This kind of hemorrhage can lead to a stroke, coma, and/or death. Aneurysms are usually found at the base of the brain just inside the skull, in an area called the subarachnoid space. In fact, 90 percent of SAHs are attributed to ruptured cerebral aneurysms and the two terms are often used synonymously.

Encephalitis (en-sef-uh-LIE-tis) is inflammation of the brain. Viral infections are the most common cause of the condition. Encephalitis can cause flu-like symptoms, such as a fever or severe headache. It can also cause confused thinking, seizures, or problems with senses or movement. However, many cases of encephalitis result in only mild flu-like symptoms or even no symptoms. Severe cases of encephalitis, while relatively rare, can be life-threatening. Because the course of any single case of encephalitis can be unpredictable, it's important to get a timely diagnosis and treatment.

A video from the New England Journal of Medicine performed by Harvard medical school showing Thoracocentesis

Muscle Contraction Part 3 The Cross Bridge Cycle

Deep Vein Thrombosis Treatment With Trellis Procedure

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For most cancers, researchers are still trying to understand how they are caused. The same is true for lymphoma - doctors do not know what causes it, although it is more likely to occur in certain people.5,7,8 Medical researchers have identified certain risk factors that make lymphoma more likely, although they often do not understand why:5,8 Non-Hodgkin's lymphoma Age - most non-Hodgkin lymphomas are in people 60 years of age and over Sex - there are different rates of different types of non-Hodgkin's lymphoma across the sexes Ethnicity and location - in the US, African-Americans and Asian-Americans are less prone than white Americans, and the disease is more common in developed nations of the world Chemicals and radiation - some chemicals used in agriculture have been linked, as has nuclear radiation exposure Immune deficiency - for example, caused by HIV infection or in organ transplantation Autoimmune disease, in which the immune system attacks the body's own cells Infection - certain viral and bacterial infections increase the risk. The Helicobacter Infection has been implicated, as has the Epstein Barr Virus (the virus that causes glandular fever)13 See the American Cancer Society's page for more detail on risk factors for non-Hodgkin's lymphoma. Hodgkin's lymphoma Infectious mononucleosis - infection with Epstein-Barr virus Age - two specific groups are most affected: typically people in their 20s, and people over the age of 55 years Sex - slightly more common in men Location - most common in the US, Canada and northern Europe; least common in Asia Family - if a sibling has the condition, the risk is slightly higher, and very high if there is an identical twin Affluence - people from higher socioeconomic status are at greater risk HIV infection

This animation demonstrates how a unilateral complete cleft lip repair is performed. This video is meant for educational purposes for patients and families. There are many ways to fix a complete cleft lip, but the technique shown here is the most common known as the Millard Rotation Advancement Repair.

Tinnitus (TIN-ih-tus) is the perception of noise or ringing in the ears. A common problem, tinnitus affects about 1 in 5 people. Tinnitus isn't a condition itself — it's a symptom of an underlying condition, such as age-related hearing loss, ear injury or a circulatory system disorder