Category: H

  • Herniated intervertebral disk

    Rupture of the soft tissue that separates two vertebral bones into the spinal canal or adjacent spinal nerve roots. Herniation of intervertebral disks can cause back pain and, occasionally, loss of neurological function in the distribution of affected nerves.  

  • Hereditary diseases

    A disease due to genetic factors transmitted from parent to offspring. Also known as an inherited disease. A disease caused by abnormal chromosomes or by defective genes inherited by a child from one or both parents.  

  • Hygroscopic dilator

    A gynecological dilator made of materials that swell after absorbing fluids from body tissues. It is used to facilitate dilation of the cervix uteri (uterine cervix), e.g., in induction of labor or in dilation and curettage.  

  • Hegar’s dilator

    Graduated metal sounds that are inserted into the cervical canal and cause a graded dilation.  

  • High-residue diet

    A diet that contains considerable amounts of substances such as fiber or cellulose, which the human body is unable to metabolize and absorb. This diet is particularly useful in treating constipation and may be beneficial also in preventing certain diseases of the gastrointestinal tract. Lay persons may refer to a high-residue diet as one containing…

  • Hernia of diaphragm

    A congenital or traumatic protrusion of abdominal contents through the diaphragm.  

  • Head immobilization device

    A device that attaches to a long back board and holds the patient’s head in neutral alignment. Also called cervical immobilization device.  

  • Heterodont dentition

    A set of teeth of various shapes that may serve different functions (e.g., incisors, canines, and molars).  

  • Hospital dentistry

    The practice of dentistry in a hospital where the dentist is an integral part of the comprehensive health care team.  

  • Hydropic degeneration

    Pathological change in cells marked by the appearance of water droplets in the cytoplasm.