Category: H

  • Holistic treatment

    The aim is to treat the whole person, body, mind and spirit, not just the presenting symptoms. It takes into account inherited tendencies, personal history, past medical treatment, individual attitude to the life experience and environmental factors. Treatment is geared to strengthening natural immunity and enhancing a general level of wellbeing.  

  • Hypnogenic zone

    Any area of the body that, when pressed on, induces hypnosis.  

  • Hot zone

    In a hazardous materials incident or biohazard laboratory, the area where the hazardous materials are located. This area cannot be entered without protective equipment, special permission, and specialized training.  

  • Hereditary xerocytosis

    A disorder of erythrocytes usually inherited as an autosomal dominant trait. A membrane defect in the red blood cells permits the loss of excess potassium ions and water, causing dehydration of the cells. Hemolysis and anemia range from mild to severe.  

  • Heavy water

    An isotopic variety of water, especially deuterium oxide, in which hydrogen has been displaced by its isotope, deuterium. Its properties differ from ordinary water in that heavy water has a higher freezing and boiling point and is incapable of supporting life.  

  • Hospital volume

    The number of cases of specific conditions (e.g., stroke, acute myocardial infarction, or organ transplantation) treated at an inpatient facility. Morbidity and mortality are typically lowest in treatment centers where professional staff has the greatest clinical experience.  

  • Helper virus

    A virus that permits a defective virus present in the same cell to replicate. This pertains to a specific entity that is crucial for the transmission of another virus by its vector. It is also referred to as an “assistor virus” or “carrier virus.”  

  • Horizontal vertigo

    Vertigo that occurs while the patient is supine.  

  • High-frequency percussive ventilation

    Mechanical ventilation that decreases peak and end-expiratory pressure by delivering hundreds of shallow (low tidal volume) breaths per minute. It is a time cycled, pressure-limited mode of ventilation.  

  • High-frequency oscillatory ventilation

    Pulmonary ventilation with multiple rapid breaths given at small tidal volumes. It limits the stretching and collapse of the alveoli that occur in conventional mechanical ventilation.