Respiratory Therapy Blog

Calculate total lung capacity (TLC) to assess maximum lung volume and support pulmonary function test interpretation.

Calculate the respiratory time constant (t) using resistance and compliance to assess lung filling, emptying, and ventilator mechanics.

Calculate tidal volume (VT) using patient data or ventilator settings to assess breath size, ventilation, and respiratory care needs.

Calculate systemic vascular resistance (SVR) using MAP, CVP, and cardiac output to assess afterload, perfusion, and hemodynamic status.

Estimate suction catheter size using ETT internal diameter to support safe airway suctioning and respiratory care practice.

Calculate stroke volume (SV) using cardiac output and heart rate to assess blood pumped per beat and overall cardiac function.

Calculate static lung compliance (Cstat) using tidal volume, plateau pressure, and PEEP to assess lung stiffness and ventilator mechanics.

Calculate smoking pack-years using packs per day and years smoked to assess tobacco exposure and respiratory disease risk.

Calculate QS/QT with the shunt equation to assess right-to-left shunting, oxygenation problems, and gas exchange efficiency.

Calculate respiratory quotient (RQ) using CO2 production and oxygen consumption to assess metabolism, ventilation, and energy substrate use.

Calculate rapid shallow breathing index (RSBI) using respiratory rate and tidal volume to assess readiness for ventilator weaning.

Calculate pulmonary vascular resistance (PVR) using pressure and cardiac output values to assess pulmonary circulation and hemodynamics.

Calculate the oxygen-to-air entrainment ratio to estimate air mixing, total flow, and FiO2 delivery during oxygen therapy.

Calculate oxygen tank duration using cylinder pressure, tank factor, and flow rate to estimate how long oxygen supply will last.

Calculate oxygen extraction ratio (O2ER) to assess how much delivered oxygen is used by tissues and evaluate oxygen delivery balance.