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Venous Thromboembolism
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D054556 |
[Obstruction of a vein or VEINS (embolism) by a blood clot (THROMBUS) in the blood stream.
] |
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Venous Thrombosis
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D020246 |
[The formation or presence of a blood clot (THROMBUS) within a vein.
] |
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Venous Valves
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D055422 |
[Flaps within the VEINS that allow the blood to flow only in one direction. They are usually in the medium size veins that carry blood to the heart against gravity.
] |
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Ventilation
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D014691 |
[Supplying a building or house, their rooms and corridors, with fresh air. The controlling of the environment thus may be in public or domestic sites and in medical or non-medical locales. (From Dorland, 28th ed)
] |
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Ventilation-Perfusion Ratio
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D014692 |
[The ratio of alveolar ventilation to simultaneous alveolar capillary blood flow in any part of the lung. (Stedman, 25th ed)
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Ventilation-Perfusion Scan
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D000076665 |
[A two-part radionuclide imaging that measures VENTILATION-PERFUSION RATIO of the lungs often used to investigate PULMONARY EMBOLISM. Image acquisitions may be performed using various combinations of gamma camera, PET and SPECT scanning techniques.
] |
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Ventilator Weaning
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D015300 |
[Techniques for effecting the transition of the respiratory-failure patient from mechanical ventilation to spontaneous ventilation, while meeting the criteria that tidal volume be above a given threshold (greater than 5 ml/kg), respiratory frequency be below a given count (less than 30 breaths/min), and oxygen partial pressure be above a given threshold (PaO2 greater than 50mm Hg). Weaning studies focus on finding methods to monitor and predict the outcome of mechanical ventilator weaning as well as finding ventilatory support techniques which will facilitate successful weaning. Present methods include intermittent mandatory ventilation, intermittent positive pressure ventilation, and mandatory minute volume ventilation.
] |
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Ventilator-Induced Lung Injury
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D055397 |
[Lung damage that is caused by the adverse effects of PULMONARY VENTILATOR usage. The high frequency and tidal volumes produced by a mechanical ventilator can cause alveolar disruption and PULMONARY EDEMA.
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Ventilators, Mechanical
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D012122 |
[Mechanical devices used to produce or assist pulmonary ventilation.
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Ventilators, Negative-Pressure
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D015919 |
[Body ventilators that assist ventilation by applying intermittent subatmospheric pressure around the thorax, abdomen, or airway and periodically expand the chest wall and inflate the lungs. They are relatively simple to operate and do not require tracheostomy. These devices include the tank ventilators ("iron lung"), Portalung, Pneumowrap, and chest cuirass ("tortoise shell").
] |
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Ventral Striatum
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D066328 |
[A composite structure of the TELENCEPHALON that is defined by connectivity. It includes the NUCLEUS ACCUMBENS; the ISLANDS OF CALLEJA; and parts of the CAUDATE NUCLEUS; the PUTAMEN; and the SUBSTANTIA INNOMINATA.
] |
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Ventral Tegmental Area
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D017557 |
[A region in the MESENCEPHALON which is dorsomedial to the SUBSTANTIA NIGRA and ventral to the RED NUCLEUS. The mesocortical and mesolimbic dopaminergic systems originate here, including an important projection to the NUCLEUS ACCUMBENS. Overactivity of the cells in this area has been suspected to contribute to the positive symptoms of SCHIZOPHRENIA.
] |
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Ventral Thalamic Nuclei
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D020651 |
[A large group of nuclei lying between the internal medullary lamina and the INTERNAL CAPSULE. It includes the ventral anterior, ventral lateral, and ventral posterior nuclei.
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Ventricular Dysfunction
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D018754 |
[A condition in which HEART VENTRICLES exhibit impaired function.
] |
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Ventricular Dysfunction, Left
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D018487 |
[A condition in which the LEFT VENTRICLE of the heart was functionally impaired. This condition usually leads to HEART FAILURE; MYOCARDIAL INFARCTION; and other cardiovascular complications. Diagnosis is made by measuring the diminished ejection fraction and a depressed level of motility of the left ventricular wall.
] |
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Ventricular Dysfunction, Right
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D018497 |
[A condition in which the RIGHT VENTRICLE of the heart was functionally impaired. This condition usually leads to HEART FAILURE or MYOCARDIAL INFARCTION, and other cardiovascular complications. Diagnosis is made by measuring the diminished ejection fraction and a depressed level of motility of the right ventricular wall.
] |
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Ventricular Fibrillation
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D014693 |
[A potentially lethal cardiac arrhythmia that is characterized by uncoordinated extremely rapid firing of electrical impulses (400-600/min) in HEART VENTRICLES. Such asynchronous ventricular quivering or fibrillation prevents any effective cardiac output and results in unconsciousness (SYNCOPE). It is one of the major electrocardiographic patterns seen with CARDIAC ARREST.
] |
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Ventricular Flutter
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D054141 |
[A potentially lethal cardiac arrhythmia characterized by an extremely rapid, hemodynamically unstable ventricular tachycardia (150-300 beats/min) with a large oscillating sine-wave appearance. If untreated, ventricular flutter typically progresses to VENTRICULAR FIBRILLATION.
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Ventricular Function
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D016276 |
[The hemodynamic and electrophysiological action of the HEART VENTRICLES.
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Ventricular Function, Left
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D016277 |
[The hemodynamic and electrophysiological action of the left HEART VENTRICLE. Its measurement is an important aspect of the clinical evaluation of patients with heart disease to determine the effects of the disease on cardiac performance.
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