Mindblown: a blog about philosophy.
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Hill sign
A physical finding formerly used to determine aortic regurgitation. When the blood pressure in the leg is 20 to 40 mm Hg higher than in the arm, this sign is considered positive and indicative of aortic regurgitation.
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Hill-sachs lesion
An indentation fracture of the posterolateral humeral head that occurs following an anterior dislocation of the glenohumeral joint. The lesion involves the cartilage of the humeral head, causing instability that may predispose the individual to subsequent anterior glenohumeral dislocations.
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Axon hillock
A small conical elevation on the cell body of a neuron from which the axon arises.
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Hillock
A small eminence or projection.
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Hilitis
An inflammation of any hilum, especially the hilum of the lung.
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High-pressure relief valve
A safety device built into a ventilator circuit that protects the patient from excessively high airway pressures by venting excess pressure into the atmosphere.
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Highly reliable organization
An institution that consistently makes fewer mistakes than others working in the same field despite conditions that are stressful, fast-paced, or full of risk. Health care institutions strive to be HROs, i.e., to copy the performance achieved by other industries such as airlines, power plants, and utilities. Becoming an HRO requires a commitment to quality…
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Highly active antiretroviral therapy
The combined use of antiviral agents from three or more classes of drugs to treat patients with human immunodeficiency virus (HIV) infection. HAART reduces the number of viruses circulating in the blood (viral load), and prolongs life and disease-free survival. Reverse transcriptase inhibitors, nonnucleoside reverse transcriptase inhibitors, and protease inhibitors are used in HAART. HIV/AIDS…
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High-intensity focused ultrasound
A noninvasive treatment in which ultrasonic energy is used to generate heat for therapeutic purposes within the body. HIFU has been used, for example, to cauterize internal blood vessels that are bleeding or to cavitate or coagulate growths or solid malignancies (such as breast, liver, pancreatic, or prostate cancers). The ultrasound transducer is placed on…
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High-grade squamous intraepithelial lesion
A premalignant squamous lesion, found on Papanicolaou test, which may be moderate dysplasia, severe dysplasia, or carcinoma in situ.
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