For Parents

This is poisoning from sucking nectar from the flowers or chewing leaves from the oleander or yellow oleander plant. Poisoning can also happen if you eat honey made by bees that used the oleander plant for nectar.

Olivopontocerebellar atrophy is a disease that causes certain brain areas to shrink.

An omphalocele is a birth defect in which the infant's intestine or other abdominal organs stick out of the belly button (navel). In babies with an omphalocele, the intestines are covered only by a thin layer of tissue and can be easily seen.An omphalocele is a type of hernia. Hernia means "rupture.”See also: Umbilical hernia

Omphalocele repair is surgery to repair a birth defect in which all or parts of the small intestine, liver, and large intestine stick outside of the abdomen.For information on the condition itself, see: Omphalocele

Open heart surgery is any surgery where the chest is opened and surgery is performed on the heart. The term "open" refers to the chest, not the heart itself. The heart may or may not be opened, depending on the type of surgery.Open heart surgery includes surgery on the heart muscle, valves, arteries, or other structures.A heart-lung machine (also called cardiopulmonary bypass) is usually during conventional open heart surgery to help provide oxygen-rich blood to the brain and other vital organs. The machine also pumps, supplies oxygen, removes carbon dioxide from the blood, and provides anesthesia to keep the patient asleep during surgery.The definition of open heart surgery becomes confusing in light of new procedures being performed on the heart through smaller incisions. There are some new surgical procedures being performed that are done with the heart still beating. Minimally invasive heart surgery (MIDCAB, OPCAB, RACAB), including robotic-assisted heart surgery, is still considered open heart surgery. However, these procedures are being used in some patients as an alternative to open heart surgery requiring the heart-lung machine.Related topics:Angioplasty of the heartAtrial septal defect repairCardiac transplantCoarctation of the aorta repairCongenital heart defect corrective surgeryHeart bypass surgery (coronary artery bypass graft - CABG)Heart transplantHeart valve prosthesisHeart valve surgeryHeart-and-lung transplantHypoplastic left heart repairMinimally invasive heart surgery (MIDCAB, OPCAB, RACAB)Patent ductus arteriosus ligationPDA ligationProsthetic heart valvesTetralogy of Fallot repairTotal anomalous pulmonary venous return correctionTransplant of the heartTransplant of the heart and lungsTransposition of great vessels repairTricuspid atresia repairTruncus arteriosus repairValve replacementVentricular septal defect repairVSD repair

An open lung biopsy is surgery to remove a small piece of tissue from the lung. The sample is then examined for cancer, infection, or lung disease.

An open pleural biopsy is a procedure to remove and examine the tissue that lines the inside of the chest. This tissue is called the pleura.

Ophthalmoscopy is an examination of the back part of the eyeball (fundus), which includes the retina, optic disc, choroid, and blood vessels.

Opiate withdrawal is caused by stopping, or dramatically reducing, opiate use after heavy and prolonged use (several weeks or more).Opiates include heroin, morphine, codeine, Oxycontin, Dilaudid, methadone, and others.

Opium and its forms (which include morphine, heroin, oxycodone, and the synthetic opioid narcotics) lead to an abnormal mental state, which generally involves excessive sleepiness or unconsciousness.Symptoms depending on how much is taken. Persons who have opium intoxication usually have respiratory (breathing) depression and small pupils.Severe opiod intoxication can cause you to stop breathing altogether. This is how people die from an overdose of opiods.