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Preload is an engineering term with several meanings. In the general sense, it refers to the internal application of stress to certain mechanical systems.
Preload (cardiology), maximum stretch of the heart at the end of diastole preload (software) , code-prefetching software for Linux Preload (engineering) , the internal application of stress to certain mechanical systems
Preload can still be approximated by the inexpensive echocardiographic measurement end-diastolic volume or EDV. Preload increases with exercise (slightly), increasing blood volume (as in edema, excessive blood transfusion (overtransfusion), polycythemia) and neuroendocrine activity (sympathetic tone). An arteriovenous fistula can increase ...
The three curves illustrate that shifts along the same line indicate a change in preload, while shifts from one line to another indicate a change in afterload or contractility. A blood volume increase would cause a shift along the line to the right, which increases left ventricular end diastolic volume (x axis), and therefore also increases ...
The Impella device is an alternative for percutaneous mechanical circulatory support that has been utilized as a bridge to recovery. Used alone or in tandem sets, it utilizes the concept of magnetic levitation [clarification needed] to reduce moving parts to an absolute minimum, thus reducing anticoagulation requirements.
Multiple techniques exist for preload control to ensure that the tension in the bolt is close to the one specified in the design (some bolt-to-bolt statistical variations are inevitable): [1] torque-controlled tightening is a simple and most popular approach: the fastener is tightened until the torque limit is reached.
The pressure-volume area (PVA) is the total mechanical energy generated by ventricular contraction. Pressure-volume (PV) loop analysis provides a framework for understanding how acute cardiac unloading reduces MVO2 in the heart.
A complementary maneuver for differentiating disorders is the Valsalva maneuver, which decreases preload. [7] Handgripping maneuver Cardiac Finding