Haemodynamics & Circulatory Assessment
Every haemodynamics & circulatory assessment calculator on CalcEngines — unit converters, derived indices and interpretive tools, each with its formula, a worked example and the reference intervals it is judged against.
8 calculators in this section
- Cardiac Index and Stroke Volume CalculatorIndex a cardiac output to body surface area and split it into its two factors — rate and stroke volume. The same 5 L/min is generous in one body and inadequate in another.
- Fick Cardiac Output CalculatorCardiac output from oxygen consumption and the arteriovenous oxygen content difference — the reference method, and the one whose weak link is the oxygen consumption rather than the equation.
- Gorlin Valve Area CalculatorValve area by the Gorlin hydraulic formula — the catheter method, with the flow period that most calculators quietly get wrong and the low-flow failure that makes a normal valve look stenotic.
- Mean Arterial Pressure (MAP) CalculatorMAP by the one-third rule and by the two published heart-rate-corrected forms, which disagree by several mmHg at a fast rate — because the one-third rule assumes a cardiac cycle that a tachycardic patient does not have.
- Noradrenaline Equivalent Dose CalculatorConvert a multi-agent vasopressor infusion to a single noradrenaline-equivalent figure by four published formulas at once — because the published conversion ratios disagree, and this is a research comparability measure and not a prescribing tool.
- Pulmonary Vascular Resistance (PVR) CalculatorPVR in Wood units and in dyn·s·cm⁻⁵, with the transpulmonary gradient, the diastolic gradient the 2022 guideline dropped, and the 2 Wood unit threshold the definition of pulmonary hypertension now turns on.
- Stroke Volume Variation (SVV) and PPV CalculatorThe respiratory swing in pulse pressure or stroke volume, as a percentage — and the list of conditions that invalidate it, which is longer than the formula and is the real content of the measurement.
- Systemic Vascular Resistance (SVR) CalculatorSVR and SVRI in both unit systems at once, because the two differ by exactly 80 and quoting the wrong one is the commonest eighty-fold error in haemodynamics.