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diurnal variation

   Also found in: Dictionary/thesaurus, Medical 0.01 sec.
diurnal variation [dī′ərn·əl ‚ver·ē′ā·shən]
(geophysics)
Daily variations of the earth's magnetic field at a given point on the surface, with both solar and lunar periods having their source in the horizontal movements of air in the ionosphere.


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History and examination If a patient presents with a cough, the following features should be clarified on history: * duration--days, weeks, months or years * course--constant, worsening, intermittent, diurnal variation * triggers--allergens, irritants, swallowing, position * dry or productive (nature and volume of sputum)--clear/ white/grey (mucoid), yellow/green (purulent) or bloody (haemoptysis) * other--shortness of breath, chest pain, wheeze/tightness, loss of weight, fever, sweating.
SHIMMER has now measured the PMC diurnal variation for the two northern seasons of 2007 and 2008, and surprisingly, the variation is quite different.
Diurnal variation of blood pressure; reproducibility and association with left ventricular hypertrophy in hemodialysis patients.
 
 
 
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