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Health Library: E

E2 This test measures the amount of estradiol (E2), the form of estrogen made primarily by the ovaries.		Ear Cleaning Detailed information on ears and airplane travel, ear wax, and ear cleaning
Ear Disorders Detailed information on ear disorders in children		Ear Infections Detailed information on ear infections, including otitis externa (swimmer's ear) and otitis media
Ear Oximetry Oximetry is a procedure used to measure the oxygen level—or oxygen saturation—in the blood.		Ear Pinning Detailed information on ear pinning surgery, including who might be a candidate for the procedure and possible complications of the procedure
Ear Surgery Detailed information on ear pinning surgery, including who might be a candidate for the procedure and possible complications of the procedure		Ear, Nose, and Throat Disorders Detailed information on ear, nose, and throat disorders, including hearing disorders, balance disorders, smell disorders, taste disorders, chemosensory disorders, speech disorders, voice disorders, language disorders, vocal cord disorders, and laryngeal cancer.
Ear, Nose, and Throat Facts The ear consists of three areas—the outer, middle, and inner ear. The nose is the organ of smell and is part of the peripheral nervous system. The throat is a ring-like muscular tube that acts as the passageway for air, food, and liquid.		Ears and Air Travel Detailed information on ears and airplane travel, ear wax, and ear cleaning
Ears and Airplane Travel, Ear Wax, and Ear Cleaning Detailed information on ears and airplane travel, ear wax, and ear cleaning		Eating Disorders Detailed information on the most common types of eating disorders, including anorexia, bulimia, and binge eating disorder
Eating Disorders in Children Detailed information on adolescents and eating disorders, including anorexia, bulimia, and obesity		Eating Well for Digestive Health If you're like most people, you may have gas, constipation, or heartburn every now and then.
EBCT Ultrafast CT, or electron-beam computed tomography (EBCT) can take multiple images of the heart within the time of a single heartbeat, and can detect very small amounts of calcium within the heart and the coronary arteries.		EBV Antibody This test checks for antibodies to the Epstein-Barr virus. It often doesn't have any symptoms, but in teens and young adults, it can mononucleosis.
EBV-specific antibodies This test checks for antibodies to the Epstein-Barr virus. It often doesn't have any symptoms, but in teens and young adults, it can mononucleosis.		ECG An electrocardiogram (ECG or EKG) is a simple and fast procedure that is used to evaluate the electrical activity of the heart, which is measured in "waves." Variations in the waves may indicate problems with the heart.
ECG, Ambulatory When symptoms such as dizziness, fainting, low blood pressure, prolonged fatigue, and palpitations continue to occur without a definitive diagnosis obtained with a resting ECG, your physician may request an ECG tracing to be run over a long period of time, using a Holter monitor.		ECG, Exercise An exercise ECG is a simple and fast procedure that is used to evaluate the electrical activity of the heart's response to stress or exercise.
ECG, Signal-Averaged During this procedure, the electrical activity of the heart is monitored over a period of several minutes in order to capture abnormal heartbeats which may occur only intermittently.		ECG/EKG, Continuous When symptoms such as dizziness, fainting, low blood pressure, prolonged fatigue, and palpitations continue to occur without a definitive diagnosis obtained with a resting ECG, your physician may request an ECG tracing to be run over a long period of time, using a Holter monitor.
ECG/EKG, Exercise An exercise ECG is a simple and fast procedure that is used to evaluate the electrical activity of the heart's response to stress or exercise.		ECG/EKG, Signal-Averaged During this procedure, the electrical activity of the heart is monitored over a period of several minutes in order to capture abnormal heartbeats which may occur only intermittently.
ECG/EKG, Stress An exercise ECG is a simple and fast procedure that is used to evaluate the electrical activity of the heart's response to stress or exercise.		Echo, Cardiac An echocardiogram is a procedure in which ultrasonic sound waves are used to assess the heart's function and structures.
Echo, Dobutamine Stress A dobutamine stress echocardiogram is a diagnostic procedure in which an intravenous medication called dobutamine is used when an exercise stress test is not recommended. Dobutamine mimics the effects of exercise on the heart.		Echo, Exercise An exercise echocardiogram is a procedure in which ultrasound, or sound wave technology, is used to asses the heart's response to stress or exercise.
Echo, Stress An exercise echocardiogram is a procedure in which ultrasound, or sound wave technology, is used to asses the heart's response to stress or exercise.		Echo, Transesophageal A transesophageal echocardiogram uses sound wave (ultrasound) technology to examine heart function. By inserting a probe with a transducer down the esophagus rather than placing the transducer on the chest, physicians get a clearer image of the heart because the sound waves do not have to pass through skin, muscle, or bone tissue.
Echocardiogram An echocardiogram is a procedure in which ultrasonic sound waves are used to assess the heart's function and structures.		Echocardiogram, Dobutamine Stress A dobutamine stress echocardiogram is a diagnostic procedure in which an intravenous medication called dobutamine is used when an exercise stress test is not recommended. Dobutamine mimics the effects of exercise on the heart.
Echocardiogram, Exercise An exercise echocardiogram is a procedure in which ultrasound, or sound wave technology, is used to asses the heart's response to stress or exercise.		Echocardiogram, Stress An exercise echocardiogram is a procedure in which ultrasound, or sound wave technology, is used to asses the heart's response to stress or exercise.
Echocardiogram, Transesophageal A transesophageal echocardiogram uses sound wave (ultrasound) technology to examine heart function. By inserting a probe with a transducer down the esophagus rather than placing the transducer on the chest, physicians get a clearer image of the heart because the sound waves do not have to pass through skin, muscle, or bone tissue.		Echocardiography An echocardiogram is a procedure in which ultrasonic sound waves are used to assess the heart's function and structures.
ECRP of the Biliary and Pancreatic Ducts Endoscopic retrograde cholangiopancreatography (ERCP) is a procedure in which x-ray and an endoscope - a long, flexible, lighted tube - are used to assess and treat problems in the liver, gallbladder, bile ducts, and pancreas.		EEG The EEG is used to evaluate several types of brain disorders, including epilepsy, Alzheimer's disease, certain psychoses, and certain sleep disorders.
Effective Breastfeeding Think there’s only one way to breast-feed? Think again! Moms can position their babies in several positions during feeding time that can be comfortable for both.		Effective Sucking It’s important for your baby’s health to be able to effectively remove milk from your breast during nursing. To do this, your baby must learn the proper way to suck. But how do you know if your baby is actually getting the nutrition he/she needs? Here’s a guide to help you.
Effects of Ultraviolet (UV) Exposure Detailed information on the effects of ultraviolet light and the increased risk of skin cancer, premature aging, cataracts, and immune system damage		EGD Esophagogastroduodenoscopy (EGD) is a diagnostic procedure used to diagnose structural or functional abnormalities of the esophagus, stomach, and/or duodenum.
EGFR This test looks for changes in how well your kidneys are working. This is especially important if you have diabetes or high blood pressure.		Eisenmenger's Syndrome Eisenmenger’s syndrome primarily affects adolescents and adults with congenital heart defects that were repaired after their first birthday or that were never repaired.
EKG An electrocardiogram (ECG or EKG) is a simple and fast procedure that is used to evaluate the electrical activity of the heart, which is measured in "waves." Variations in the waves may indicate problems with the heart.		EKG, Ambulatory When symptoms such as dizziness, fainting, low blood pressure, prolonged fatigue, and palpitations continue to occur without a definitive diagnosis obtained with a resting ECG, your physician may request an ECG tracing to be run over a long period of time, using a Holter monitor.
EKG, Exercise An exercise ECG is a simple and fast procedure that is used to evaluate the electrical activity of the heart's response to stress or exercise.		EKG, Signal-Averaged During this procedure, the electrical activity of the heart is monitored over a period of several minutes in order to capture abnormal heartbeats which may occur only intermittently.
EKG/ECG An arrhythmia is an abnormal rhythm of the heart that can cause the heart to pump less effectively.		Elbow Pain and Problems Detailed information on elbow pain and problems
Elder Care Elder care encompasses a wide variety of issues, including choosing an appropriate doctor to care for an aging patient, and making decisions about moving an elderly adult from the home environment to a residential care setting.		Elective Surgery Detailed information on the different types of surgery, including surgical diagnosis, optional surgery, elective surgery, required surgery, urgent surgery, or emergency surgery
Electric and Magnetic Fields Detailed information on electric and magnetic fields		Electrocardiogram An arrhythmia is an abnormal rhythm of the heart that can cause the heart to pump less effectively.
Electrocardiogram During this procedure, the electrical activity of the heart is monitored over a period of several minutes in order to capture abnormal heartbeats which may occur only intermittently.		Electrocardiogram An electrocardiogram (ECG or EKG) is a simple and fast procedure that is used to evaluate the electrical activity of the heart, which is measured in "waves." Variations in the waves may indicate problems with the heart.
Electrocardiogram (EKG) / Stress Test / Holter Monitor Detailed information on an electrocardiogram (EKG) procedure, including how the procedure is performed, reasons for the procedure, and pre- and post-evaluation instructions		Electrocardiogram (EKG)/Stress Test/Holter Monitor An arrhythmia is an abnormal rhythm of the heart that can cause the heart to pump less effectively.
Electrocardiogram, Exercise An exercise ECG is a simple and fast procedure that is used to evaluate the electrical activity of the heart's response to stress or exercise.		Electrocardiogram, Signal-Averaged During this procedure, the electrical activity of the heart is monitored over a period of several minutes in order to capture abnormal heartbeats which may occur only intermittently.
Electrocardiography An electrocardiogram (ECG or EKG) is a simple and fast procedure that is used to evaluate the electrical activity of the heart, which is measured in "waves." Variations in the waves may indicate problems with the heart.		Electroencephalogram (EEG) The EEG is used to evaluate several types of brain disorders, including epilepsy, Alzheimer's disease, certain psychoses, and certain sleep disorders.
Electroencephalography The EEG is used to evaluate several types of brain disorders, including epilepsy, Alzheimer's disease, certain psychoses, and certain sleep disorders.		Electrolyte panel This test measures the main electrolytes in your body: sodium, chloride, potassium, and carbon dioxide.
Electrolyte panel This blood test gives information about your body’s metabolism. It gives a snapshot of the health of your kidneys, your blood sugar levels, and the levels of key electrolytes, such as potassium and sodium.		Electrolytes This test measures the main electrolytes in your body: sodium, chloride, potassium, and carbon dioxide.
Electromagnetic Fields Detailed information on electric and magnetic fields		Electromagnetic Therapy Detailed information on electromagnetic therapy, also called bioelectricity, magnetobiology, magnetic field therapy, and magnetic healing, as a form of alternative therapy
Electromyography (EMG) Electromyography (EMG) measures muscle response or electrical activity in response to a nerve’s stimulation of the muscle. The test is used to help detect neuromuscular abnormalities.		Electron Beam CT Scan (EBCT) Ultrafast CT, or electron-beam computed tomography (EBCT) can take multiple images of the heart within the time of a single heartbeat, and can detect very small amounts of calcium within the heart and the coronary arteries.
Electroneurography Nerve conduction velocity (NCV) test - also called a nerve conduction study (NCS) - is a measurement of the speed of conduction of an electrical impulse through a nerve. NCV can determine nerve damage and destruction.		Electroneurography (EneG) Nerve conduction velocity (NCV) test - also called a nerve conduction study (NCS) - is a measurement of the speed of conduction of an electrical impulse through a nerve. NCV can determine nerve damage and destruction.
Electronystagmography (ENG) Detailed information on electronystagmography (ENG), including the reasons and preparation for the procedure, how the procedure is performed, after care, and an anatomical illustration of the ear		Electrooculography Detailed information on electronystagmography (ENG), including the reasons and preparation for the procedure, how the procedure is performed, after care, and an anatomical illustration of the ear
Electrophysiological Studies An arrhythmia is an abnormal rhythm of the heart that can cause the heart to pump less effectively.		Electrophysiological Studies When a problem develops with the heart’s rhythm, there may or may not be any symptoms. An electrophysiological study (EP study) is an invasive procedure that tests the heart's electrical system to determine the cause of the dysrhythmia.
Electrophysiology Studies When a problem develops with the heart’s rhythm, there may or may not be any symptoms. An electrophysiological study (EP study) is an invasive procedure that tests the heart's electrical system to determine the cause of the dysrhythmia.		ELISA This test looks for antibodies against Toxoplasma gondii (T. gondii) infection in your blood.
EMA test This test looks for certain antibodies in your blood that may mean you have celiac disease, an autoimmune disease that affects your intestines.		Emergency Information Form In an emergency, it is easy to "forget" even the most well-known information. That's why it is crucial for you to complete the information in this form for each member of your household.
Emergency Surgery Detailed information on the different types of surgery, including surgical diagnosis, optional surgery, elective surgery, required surgery, urgent surgery, or emergency surgery		Emerging Infectious Diseases Detailed information on emerging infectious diseases and how travelers can minimize their risk of infectious diseases
EMG Electromyography (EMG) measures muscle response or electrical activity in response to a nerve’s stimulation of the muscle. The test is used to help detect neuromuscular abnormalities.		Emotions and Heart Health Since ancient times, the heart has been a symbol of our emotions. But in recent years, scientists have uncovered a clear physical link between emotions and heart health.
Empty Sella Syndrome Detailed information on empty sella syndrome, including symptoms, diagnosis, and treatment		Encephalitis Encephalitis is a term used to describe inflammation of the brain. The inflammation causes the brain to swell, which leads to changes in a person's neurologic condition, including mental confusion and seizures.
Encephalitis in Children Encephalitis refers to inflammation of the brain. The inflammation causes the brain to swell, which leads to changes in the child's neurological condition, including mental confusion and seizures.		Enchondroma Enchondromas are the most common type of hand tumor. Although they may affect people of any age, they are most common between ages 10 and 20.
Encopresis Detailed information on encopresis, including causes, symptoms, diagnosis, and treatment		End Stage Renal Disease (ESRD) Detailed information on end-stage renal disease, including renal failure symptoms, diagnosis, and treatment
Endarterectomy Angioplasty Stenting, Carotid Carotid endarterectomy (CEA) may be performed to treat a blockage or narrowing of the carotid arteries, thus improving blood supply to the brain. Carotid artery angioplasty with stenting (CAS) is a procedure currently being used on selected patients who are at high risk for surgery.		Endarterectomy, Carotid Carotid endarterectomy (CEA) may be performed to treat a blockage or narrowing of the carotid arteries, thus improving blood supply to the brain. Carotid artery angioplasty with stenting (CAS) is a procedure currently being used on selected patients who are at high risk for surgery.
Endocrinology Statistics Statistics relating to endocrine disorders		Endometrial Ablation Endometrial ablation is a procedure to permanently remove a thin tissue layer of the lining of the uterus to stop or reduce excessive or abnormal bleeding in women for whom childbearing is complete.
Endometrial Biopsy An endometrial biopsy is a procedure performed to obtain a small tissue sample from the lining of the uterus.		Endometrial Cancer Cancer of the endometrium is a disease in which cancerous cells are found in the lining of the uterus. It is highly curable when found early.
Endometriosis Women with endometriosis develop tissue that looks and acts like endometrial tissue outside the uterus, usually on other reproductive organs inside the pelvis or in the abdominal cavity.		Endomysial Antibody This test looks for certain antibodies in your blood that may mean you have celiac disease, an autoimmune disease that affects your intestines.
Endoscopic Endonasal Surgery Endoscopic endonasal surgery is a minimally invasive technique that allows a surgeon to go through the nose to correct problems or remove a tumor in various areas of the brain and the top of the spine.		Endoscopic Examination of the Mediastinum A mediastinoscopy is a surgical procedure performed to examine the mediastinum - the space behind the sternum (breastbone) in the middle of the chest that separates the two lungs.
Endoscopic Pituitary Surgery The pituitary gland is located at the bottom of your brain and above the inside of your nose. Endoscopic pituitary surgery is the most common surgery used to remove pituitary tumors.		Endoscopic Retrograde Cholangiopancreatography Endoscopic retrograde cholangiopancreatography (ERCP) is a procedure in which x-ray and an endoscope - a long, flexible, lighted tube - are used to assess and treat problems in the liver, gallbladder, bile ducts, and pancreas.
Endoscopic Skull Base Surgery Skull base surgery may be done to remove both benign and cancerous growths, and abnormalities on the underside of the brain, the skull base, or the top few vertebrae of the spinal column.		Endoscopic thoracic sympathectomy During a sympathectomy, a surgeon cuts or clamps the sympathetic nerve chain runs up and down along your spine. This procedure is used to treat heavy sweating in the palms of the hands, the face, the underarms, and feet, as well as to treat facial blushing and Raynaud phenomenon.
Endoscopic Transsphenoidal Surgery The pituitary gland is located at the bottom of your brain and above the inside of your nose. Endoscopic pituitary surgery is the most common surgery used to remove pituitary tumors.		Endoscopy, Lower A colonoscopy uses a small camera to examine the inside of the colon. It is typically used to screen for colon cancer, and to asses other injuries, abnormalities, or disease.
Endovaginal Ultrasound Ultrasound, or sound wave technology, is used to examine the organs and structures in the female pelvis.		Endovascular Aneurysm Repair Abdominal aortic aneurysm (AAA) repair is a procedure used to treat an aneurysm (abnormal enlargement) of the abdominal aorta, which may be performed surgically through an open incision or in a minimally-invasive procedure called endovascular aneurysm repair (EVAR).
Endovascular Aneurysm Repair (EVAR) Abdominal aortic aneurysm (AAA) repair is a procedure used to treat an aneurysm (abnormal enlargement) of the abdominal aorta, which may be performed surgically through an open incision or in a minimally-invasive procedure called endovascular aneurysm repair (EVAR).		Endovascular Coiling During endovascular coiling, a catheter is used to insert a small coil into an artery in the brain. The coil constricts the artery, blocking blood flow to an aneurysm.
Endovascular Embolization During endovascular coiling, a catheter is used to insert a small coil into an artery in the brain. The coil constricts the artery, blocking blood flow to an aneurysm.		Endovascular Neurosurgery and Interventional Neuroradiology Endovascular neurosurgery is a subspecialty within neurosurgery that uses catheters and radiology to diagnose and treat various conditions and diseases of the central nervous system.
EneG Nerve conduction velocity (NCV) test - also called a nerve conduction study (NCS) - is a measurement of the speed of conduction of an electrical impulse through a nerve. NCV can determine nerve damage and destruction.		ENG Detailed information on electronystagmography (ENG), including the reasons and preparation for the procedure, how the procedure is performed, after care, and an anatomical illustration of the ear
Entamoeba histolytica Antibody This test looks for antibodies to a parasite that causes the disease amebiasis. This disease is more common in tropical countries with poor sanitation.		Environmental Disease Factors Detailed information on environmental disease factors, including mold, air pollution, asthma triggers, carbon monoxide poisoning, lead poisoning, radon, multiple chemical sensitivity, electric and magnetic fields, and Gulf war syndrome
Eosinophilic Esophagitis When you think of allergic reactions, you probably envision itchy eyes and a runny nose. But an allergic reaction can occur in the esophagus – your food pipe – as well.		EP Studies When a problem develops with the heart’s rhythm, there may or may not be any symptoms. An electrophysiological study (EP study) is an invasive procedure that tests the heart's electrical system to determine the cause of the dysrhythmia.
Epidemiology Epidemiology is the study of the occurrence of disease in people, and applying that information from the study to the control of health problems.		Epididymitis in Children In the male reproductive system, the epididymis is a tiny coiled tube that stores, matures, and carries sperm. When the epididymis gets infected for one reason or another, it leads to inflammation, known as epididymitis.
Epidural Anesthetic During surgery, you will be given some form of anesthesia—medication administered for the relief of pain and sensation during surgery. The type and dosage of anesthesia is determined by the anesthesiologist.		Epidural Corticosteroid Injections If you are experiencing intense, intractable pain in your legs or arms from inflamed spinal nerves, then an epidural steroid injection might be the preferred treatment to quickly give you relief.
Epiglottitis Detailed information on epiglottitis, including causes, symptoms, diagnosis, and treatment		Epilepsy and Pregnancy Epilepsy and the medications to treat it can have affect the mother, the pregnancy, and the fetus and newborn. Fortunately, most women are able to have a healthy pregnancy and baby.
Episiotomy During childbirth, the vagina may not stretch enough. If this occurs, your health care provider may perform an episiotomy to help enlarge the opening and deliver the baby.		EPO This test measures how much of the hormone erythropoietin you have in your blood. You may need this test to help find out what kind of anemia you have.
EPS When a problem develops with the heart’s rhythm, there may or may not be any symptoms. An electrophysiological study (EP study) is an invasive procedure that tests the heart's electrical system to determine the cause of the dysrhythmia.		Epstein-Barr test This test looks for signs in your blood that you have the Epstein-Barr virus, the virus that causes mono.
ERCP Endoscopic retrograde cholangiopancreatography (ERCP) is a procedure in which x-ray and an endoscope - a long, flexible, lighted tube - are used to assess and treat problems in the liver, gallbladder, bile ducts, and pancreas.		Erythema Multiforme Detailed information on erythema multiforme, including symptoms and treatment
Erythema Nodosum Detailed information on erythema nodosum, including causes, symptoms, diagnosis, and treatment		Erythrocyte Ab This test looks for antibodies to red blood cells (RBCs) in your blood. These antibodies can cause problems during blood transfusions or, if you're pregnant, with your unborn baby.
Erythrocyte Protoporphyrin Test The protoporphyrin test is used to diagnose blood abnormalities caused by lead. The test can indicate lead exposure or lead poisoning.		Erythrocyte Sedimentation Rate This test measures how quickly your red blood cells settle to the bottom of a test tube. The faster they settle, the more likely you have inflammation.
Erythropoietin (Blood) This test measures how much of the hormone erythropoietin you have in your blood. You may need this test to help find out what kind of anemia you have.		Escherichia coli 0157:H7 This particular strain of E. coli causes a severe intestinal infection. You can get this infection by eating contaminated meat or by drinking unpasteurized juice or milk that has been contaminated.
Esophageal Cancer Detailed information on esophageal cancer, including symptoms, stages, types, risk factors, diagnosis, and treatment		Esophagitis Esophagitis is the irritation and inflammation of the lining of your esophagus, or food pipe. Because the lining of the esophagus is sensitive, many things can cause swelling and irritation.
Esophagogastroduodenoscopy Esophagogastroduodenoscopy (EGD) is a diagnostic procedure used to diagnose structural or functional abnormalities of the esophagus, stomach, and/or duodenum.		Esophagogram During this procedure, a mixture of barium and water is swallowed just before an x-ray. The barium is used to highlight damage or abnormalities in the upper gastrointestinal tract, including the pharnyx, esophagus, stomach, and duodenum.
Esophagography During this procedure, a mixture of barium and water is swallowed just before an x-ray. The barium is used to highlight damage or abnormalities in the upper gastrointestinal tract, including the pharnyx, esophagus, stomach, and duodenum.		Esophagoscopy Esophagogastroduodenoscopy (EGD) is a diagnostic procedure used to diagnose structural or functional abnormalities of the esophagus, stomach, and/or duodenum.
ESR This test measures how quickly your red blood cells settle to the bottom of a test tube. The faster they settle, the more likely you have inflammation.		Estimated glomerular filtration rate This test looks for changes in how well your kidneys are working. This is especially important if you have diabetes or high blood pressure.
Estradiol (Blood) This test measures the amount of estradiol (E2), the form of estrogen made primarily by the ovaries.		Estrogen's Effects on the Female Body In addition to regulating the menstrual cycle, estrogen affects the reproductive tract, the urinary tract, the heart and blood vessels, bones, breasts, skin, hair, mucous membranes, pelvic muscles, and the brain.
ESWL Lithotripsy treats certain kidney stones with ultrasonic energy, or shock waves, once they are located with fluoroscopy or ultrasound.		Ethanol (Blood) This test measures the amount of alcohol, or ethanol, in your blood. This test is used by law enforcement agencies and hospitals to find out the concentration of alcohol in a person’s blood.
ETS During a sympathectomy, a surgeon cuts or clamps the sympathetic nerve chain runs up and down along your spine. This procedure is used to treat heavy sweating in the palms of the hands, the face, the underarms, and feet, as well as to treat facial blushing and Raynaud phenomenon.		Evaluation Procedures To help the orthopedist determine your treatment, you'll need a physical exam, a medical history profile, and a description of symptoms.
Evaluation Procedures for Stroke Tests that may be used to help diagnose a stroke include a CT scan or MRI, and an electroencephalogram.		Evaluation Procedures, Orthopaedic To help the orthopedist determine your treatment, you'll need a physical exam, a medical history profile, and a description of symptoms.
Evaluation Procedures, Stroke Tests that may be used to help diagnose a stroke include a CT scan or MRI, and an electroencephalogram.		Evaluation, Psychiatric A psychiatric evaluation will look at symptoms and when they occur, as well as what impact they have on family and work relationships.
Event Monitor When symptoms such as dizziness, fainting, low blood pressure, prolonged fatigue, and palpitations continue to occur without a definitive diagnosis obtained with a resting ECG, your physician may request an ECG tracing to be run over a long period of time, using a Holter monitor.		Evoked Brain Potentials Evoked potential studies may be used to assess hearing or sight, especially in infants and children, to diagnose disorders of the optic nerve, and to detect tumors or other problems affecting the brain and spinal cord.
Evoked Potentials Studies Evoked potential studies may be used to assess hearing or sight, especially in infants and children, to diagnose disorders of the optic nerve, and to detect tumors or other problems affecting the brain and spinal cord.		Evoked Responses Evoked potential studies may be used to assess hearing or sight, especially in infants and children, to diagnose disorders of the optic nerve, and to detect tumors or other problems affecting the brain and spinal cord.
Ewing Sarcoma Detailed information on Ewing sarcoma, including causes, symptoms, diagnosis, and treatment		Ewing Sarcoma in Adults Ewing sarcoma can occur in any bone, but is most often found in the extremities and can involve muscle and the soft tissues around the tumor site.
Excessive Sweating Detailed information on excessive sweating, including symptoms and treatment		Excretory Urography An intravenous pyelogram is a procedure that uses a combination of contrast dyes and X-rays to look for obstructions in the blood flow of the kidneys or poor kidney function.
Exercise Exercise doesn't have to be vigorous to offer health benefits. Aim for at least 30 minutes of moderate physical activity daily, or on most days of the week.		Exercise and the Aging Person Exercise is good for people of all ages. It helps lower blood pressure, reduces the risks for falls and serious injuries, and slows the body's loss of muscle and bone mass.
Exercise ECG An exercise ECG is a simple and fast procedure that is used to evaluate the electrical activity of the heart's response to stress or exercise.		Exercise ECG/EKG An exercise ECG is a simple and fast procedure that is used to evaluate the electrical activity of the heart's response to stress or exercise.
Exercise Echocardiogram An exercise echocardiogram is a procedure in which ultrasound, or sound wave technology, is used to asses the heart's response to stress or exercise.		Exercise Echocardiography An exercise echocardiogram is a procedure in which ultrasound, or sound wave technology, is used to asses the heart's response to stress or exercise.
Exercise EKG An exercise ECG is a simple and fast procedure that is used to evaluate the electrical activity of the heart's response to stress or exercise.		Exercise Electrocardiogram An arrhythmia is an abnormal rhythm of the heart that can cause the heart to pump less effectively.
Exercise Electrocardiogram An exercise ECG is a simple and fast procedure that is used to evaluate the electrical activity of the heart's response to stress or exercise.		Exercise Thallium A stress myocardial perfusion scan is used to assess the blood flow to the heart muscle when it is stressed by exercise or medication and to determine what areas have decreased blood flow.
Exercise: Before Starting an Exercise Program It is always important to talk with your doctor before starting an exercise program, particularly if you have certain health conditions.		Exercise: The Right Program and the Right Preparation You don't have to exercise for long periods of time—or even vigorously—to become fit. You do need to aim for at least 30 minutes of moderate activity most days of the week.
Expectant Therapy Expectant therapy is to "watch and wait" while carefully observing and monitoring the prostate cancer.		Exploratory Laparoscopy Laparoscopy is a procedure that utilizes a laparoscope, a thin flexible tube containing a video camera to examine the organs of the abdominal cavity.
Exstrophy of the Bladder and Epispadias Detailed information on exstrophy of the bladder, including diagnosis and treatment		External and Internal Heart Rate Monitoring of the Fetus The fetal heart rate may change as the fetus responds to conditions in the uterus. An abnormal fetal heart rate or pattern may indicate that the fetus is not getting enough oxygen or that there are other problems.
External Beam Therapy External beam therapy is a type of therapeutic radiology that is delivered externally from a machine directed to the cancer inside the patient. Examples of external beam therapy machines include linear accelerators, cobalt machines, or orthovoltage X-ray machines.		Extracorporeal Shockwave Lipotripsy Lithotripsy treats certain kidney stones with ultrasonic energy, or shock waves, once they are located with fluoroscopy or ultrasound.
Extracorporeal Shockwave Lithotripsy (ESWL) Lithotripsy treats certain kidney stones with ultrasonic energy, or shock waves, once they are located with fluoroscopy or ultrasound.		Eye Care Specialists An ophthalmologist is either a medical doctor (M.D.) or an osteopathic physician (D.O.). An optometrist is a doctor of optometry (O.D.) but is not a medical doctor. An optician is a technician who fits eyeglasses.
Eye Conditions Detailed information on eye conditions in children		Eye Disorders Detailed information on the most common eye disorders, including age-related macular degeneration, cataracts, diabetic retinopathy, glaucoma, refractive errors, and retinitis pigmentosa
Eye Examinations During an eye exam, an eye doctor reviews your medical history and completes a series of tests to determine the health of your eyes.		Eye Safety Detailed information on eye safety and tips to avoid eye injury
Eye Safety at the Computer Detailed information on eye safety at the computer and ways to avoid eye strain		Eye Strain, Computer Detailed information on eye safety at the computer and ways to avoid eye strain
Eye Trauma Detailed information on eye trauma in children		Eye, Contact Lenses Eyeglasses are the most common form of eyewear used to correct or improve many types of vision problems. Contact lenses are worn directly on the cornea of the eye.
Eye, Examination During an eye exam, an eye doctor reviews your medical history and completes a series of tests to determine the health of your eyes.		Eye, Glasses Eyeglasses are the most common form of eyewear used to correct or improve many types of vision problems. Contact lenses are worn directly on the cornea of the eye.
Eyeglasses and Contact Lenses Eyeglasses are the most common form of eyewear used to correct or improve many types of vision problems. Contact lenses are worn directly on the cornea of the eye.		Eyelid Lacerations Eyelid lacerations are cuts to the eyelid caused by trauma. Your child's doctor will examine the eye closely to make sure no damage has occurred to the eye itself.
Eyelid Lift This procedure can remove puffiness or bags under the eyes, and can also correct droopy eyelids.

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Health Library: E