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Pacemakers are used to treat certain types of arrhythmias, as well as heart failure, a condition that occurs when the heart cannot pump enough blood to the body. Not everyone with an arrhythmia needs a pacemaker.

Pacemakers use low-energy electrical pulses to control the rate and rhythm of your heartbeat. Traditional pacemakers send the electrical pulses through wires, also known as leads. Wireless pacemakers are a newer kind of pacemaker without wires.

The Division of Human Subjects Research (DHSR) provides expertise, leadership, coordination, and guidance in the areas of policy implementation and development for human subjects research.

Osteopetrosis is a rare disorder that causes bones to grow abnormally and become too dense. When this happens, bones can break easily.

Fibrous dysplasia happens when a bone is replaced with other tissues. Bones may become weak, oddly shaped, or broken. Learn more about this rare disease.

Learn about a kidney biopsy, a procedure in which a health care professional takes small pieces of tissue from your kidney to look for signs of damage or disease.

Overview of viral hepatitis, which causes liver inflammation and damage. Several different viruses cause hepatitis, including hepatitis A, B, C, D, and E.

Learn about urinary retention—a condition in which you are unable to empty all the urine from your bladder—including both acute and chronic urinary retention.

Descripción general de úlceras pépticas (estomacales o duodenales), incluidos síntomas, diagnóstico y tratamiento. Abarca las causas e incluye la infección por H. pylori y el consumo de AINE.

Infórmese sobre las cuatro fases del síndrome de vómitos cíclicos. Describe los síntomas, causas, diagnóstico y tratamientos. Ofrece recomendaciones para prevenir el síndrome de vómitos cíclicos.