Concepts
Anesthesia calculations & concepts, explained
The clinical reasoning behind the tools inside Master Anesthesia — referenced, and shown in the app.
13 concepts across 5 categories
Calculations
Burn Fluid Resuscitation
Burn fluid resuscitation starts from the burned surface area and a milliliters-per-kilogram formula — but the modern move is to start low, adjust for children and obesity, and titrate every estimate against urine output rather than chase a fixed Parkland volume.
Learn more →Maximum Allowable Blood Loss(MABL)
Maximum allowable blood loss is how far a patient can bleed before reaching a transfusion trigger — built from blood volume, the starting hemoglobin or hematocrit, and the lowest value you'll accept.
Learn more →Intraoperative Fluid Management
Intraoperative fluid management starts with the 4-2-1 maintenance rule and the NPO deficit, then becomes a strategy — fixed-volume, zero-balance, or goal-directed — once real blood loss and fluid shifts enter the picture.
Learn more →Defibrillation and Cardioversion
The energy dose for defibrillation and synchronized cardioversion depends on the rhythm, the device, and the patient's weight, and it is the last thing you want to be working out during a code.
Learn more →Vitals
Mean Arterial Pressure(MAP)
Mean arterial pressure is the best single proxy for organ perfusion. It is weighted toward diastole and its safe floor changes with age.
Learn more →Preoperative EKG
Preoperative EKG guidelines come down to one question — will the result change what you do? Here's what the 2024 ACC/AHA guideline actually says, and the reflexes it overturns.
Learn more →Pharmacology
Local Anesthetic Additives
Local anesthetic additives change a block's onset, duration, and quality — but with one exception (epinephrine), they don't change the maximum safe dose or LAST risk.
Learn more →Local Anesthetic Maximum Dose
Each local anesthetic has a weight-based ceiling that keeps a patient clear of systemic toxicity, and the dose should be figured on lean weight in milligrams, not eyeballed in milliliters.
Learn more →Perioperative Insulin Management
Perioperative glucose control comes down to one decision and one fear: whether to run an insulin infusion or correct subcutaneously, and never letting the patient go hypoglycemic.
Learn more →Weight
Ideal Body Weight(IBW)
Ideal body weight is a height-based estimate of lean weight used to dose tidal volume and many medications — and, in children, it is the median weight for age.
Learn more →Broselow Tape
The Broselow tape estimates a child's weight from length when a scale isn't available — why that works, where body habitus makes length and weight diverge, and when to size airway, access, and IO gear by weight.
Learn more →Weight-Based and Ideal Body Weight Dosing(IBW)
Why anesthesia doses run on weight, when ideal body weight beats actual weight, and how infusion rates fall out of the math.
Learn more →● Master Anesthesia — App & Web
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Every calculator, drug, and decision tool you just read about — in your pocket, working offline, when the case starts.
