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An ejection fraction (EF) is the volumetric fraction (or portion of the total) of fluid (usually blood) ejected from a chamber (usually the heart) with each contraction (or heartbeat). It can refer to the cardiac atrium , [ 1 ] cardiac ventricle , [ 2 ] gall bladder, [ 3 ] or leg veins, [ 4 ] although if unspecified it usually refers to the ...
The gall bladder should respond and begin emptying into the duodenum, the amount of bile ejected can then be calculated as an ejection fraction (EF). An EF < 35% is considered to be diagnostic of biliary dyskinesia and suitable for cholecystectomy to be considered.
Time-activity curve showing concentration of tracer within a tissue regions of interest (region of interest) over time. In medical imaging, a time-activity curve is a curve of radioactivity (in terms of concentration) plotted on the y-axis against the time plotted on the x-axis.
Myocardial infarction or cardiomyopathy causes damage to the myocardium, which impairs the heart's ability to eject blood and, therefore, reduces ejection fraction. This reduction in the ejection fraction can manifest itself as heart failure. Low EF usually indicates systolic dysfunction, and severe heart failure can result in EF lower than 0.2 ...
The human gallbladder is a hollow grey-blue organ that sits in a shallow depression below the right lobe of the liver. [2] In adults, the gallbladder measures approximately 7 to 10 centimetres (2.8 to 3.9 inches) in length and 4 centimetres (1.6 in) in diameter when fully distended. [3]
Several parameters can be calculated for each loop (e.g. end-diastolic pressure, end-systolic pressure, ejection and filling intervals, contractility index, stroke volume, and ejection fraction). More importantly, other interesting parameters are derived from series of loops obtained under changing conditions.
Stroke volume is an important determinant of cardiac output, which is the product of stroke volume and heart rate, and is also used to calculate ejection fraction, which is stroke volume divided by end-diastolic volume. Because stroke volume decreases in certain conditions and disease states, stroke volume itself correlates with cardiac function.
Cholescintigraphy or hepatobiliary scintigraphy is scintigraphy of the hepatobiliary tract, including the gallbladder and bile ducts.The image produced by this type of medical imaging, called a cholescintigram, is also known by other names depending on which radiotracer is used, such as HIDA scan, PIPIDA scan, DISIDA scan, or BrIDA scan.