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An external ventricular drain ( EVD ), also known as a ventriculostomy or extraventricular drain, is a device used in neurosurgery to treat hydrocephalus and relieve elevated intracranial pressure when the normal flow of cerebrospinal fluid (CSF) inside the brain is obstructed. An EVD is a flexible plastic catheter placed by a neurosurgeon or ...
End-diastolic volume. In cardiovascular physiology, end-diastolic volume ( EDV) is the volume of blood in the right or left ventricle at end of filling in diastole which is amount of blood present in ventricle at the end of diastole. [ 1] Because greater EDVs cause greater distention of the ventricle, EDV is often used synonymously with preload ...
Cardiology. Heart failure with preserved ejection fraction ( HFpEF) is a form of heart failure in which the ejection fraction – the percentage of the volume of blood ejected from the left ventricle with each heartbeat divided by the volume of blood when the left ventricle is maximally filled – is normal, defined as greater than 50%; [ 1 ...
Stroke volume (SV) is the volume of blood ejected by the right/left ventricle in a single contraction. It is the difference between the end-diastolic volume (EDV) and the end-systolic volume (ESV). In mathematical terms, The stroke volume is affected by changes in preload, afterload, and inotropy (contractility).
Stroke volume. In cardiovascular physiology, stroke volume ( SV) is the volume of blood pumped from the ventricle per beat. Stroke volume is calculated using measurements of ventricle volumes from an echocardiogram and subtracting the volume of the blood in the ventricle at the end of a beat (called end-systolic volume [note 1]) from the volume ...
The Diversity Immigrant Visa program, also known as the green card lottery, is a United States government lottery program for receiving an immigrant visa followed by a permanent resident card.
The Rivian EDV (Electric Delivery Van) and ECV (Electric Commercial Van), also known as the Delivery, are a line of battery-electric cargo vehicles built by Rivian.Initially they were exclusive to its investor Amazon, which uses the EDV for package delivery, but in November 2023, sales were opened to other companies as the ECV / Delivery, with minor cosmetic changes. [1]
Phototool. A phototool is a printed film used in the process of manufacturing a printed circuit board (PCB). The phototool is used as a mask to expose a photoresist material. The main alternative to using phototools is maskless lithography, more commonly referred to as direct imaging. Traditionally, phototools were made with silver halide film ...