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SVR Calculation — FRCA Primary MCQ

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ModeratePhysiology - CardiovascularSVR CalculationFRCA Primary

Which of the following correctly describes the relationship between systemic vascular resistance (SVR) and the variables in the equation?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: B — SVR = (MAP - CVP) / CO

SVR is calculated as: SVR = (MAP - CVP) / CO × 80 (for dynes.s.cm⁻⁵). The formula is analogous to Ohm's law (R = ΔV/I) where MAP - CVP represents the pressure gradient driving systemic flow and CO is the flow. Normal SVR is 900-1200 dynes.s.cm⁻⁵.

Reference: Power Kam 2018 Principles of Physiology for the Anaesthetist