![]() 2009 Jan 22(1):1-23 Flow patternsĮxamples of normal and deviant flow patterns. For patients with prosthetic aortic valves, patient-prosthesis mismatch (PPM) is suspected when effective orifice area (EOA) indexed to body surface area 0.50 Aortic valve area indexed to body surface area should be considered for the large and small extremes of body surface area. 2009 Jan 22(1):1-23 Continuity equationĪortic valve area (AVA) can be calculated by using the principle of conservation of mass: “What comes in, must go out”. In addition, the simplified Bernoulli equation assumes that the proximal velocity can be ignored, a reasonable assumption when velocity is 1.5 m/s or the aortic velocity (V2) is >3.0 m/s, the proximal velocity should be included in the Bernoulli equation. This clinical equation has been derived from the more complex Bernoulli equation by assuming that viscous losses and acceleration effects are negligible and by using an approximation for the constant that relates to the mass density of blood, a conversion factor for measurement units. Simplified formula for converting velocity difference obtained by spectral Doppler to instantaneous pressure gradient. The result is the ICH volume in either ml, mm 3, or cm 3.Īn intracerebral hemorrhage volume of >50-60 mL is a poor prognostic marker.Systemic and pulmonary blood flow (Qp/Qs) ![]() In the case of a separated, multinodular, or irregular shape, use 3 instead. ![]() ICH volume = A * B * C * slices / hemorrhage shapeįor ellipsoid and round shapes, hemorrhage shape is substituted by 2. The formula to calculate ABC CT - based is simple: Cardiac Index Calculator The cardiac index (CI) is an assessment of the cardiac output value based on the patient’s size.
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