IBHRE STUDY GUIDE EQUATIONS

IBHRE STUDY GUIDE EQUATIONS

Cardiac output (CO) - ANSWER = Heart rate (HR) * stroke volume (SV)

Ejection Fraction (EF) - ANSWER = (EDV - ESV)/EDV


Ejection fraction (EF) - ANSWER = SV/EDV

Voltage (V) - Answer = Current (I) * Resistance (R).

Capacitance (C) [Farads]. - ANSWER = Charge (Q)/Voltage (V)

Battery Longevity (T) [In years] - Answer = Charge (Q) / Current (I) * 114.

Battery Longevity (T) [In years] - ANSWER = Battery Capacity [Amp*hours] /
Current Drain (I) [Amps] / Hours per Year

Energy (E) [joules] - ANSWER: V * I * time (t) [ms]

Energy (E) [joules] - Answer = (V^2 / R) * t.

Lower Rate Limit (or Base Rate) - ANSWER = Paced AV Delay + VA Interval.

Total Atrial Refractory Period (TARP) - Answer = Sensed AV Delay +
PVARP.

Wenckebach interval - ANSWER = UTR (aka MTR) - TARP [in milliseconds]

Total Atrial Refractory Period (TARP) - Answer = Point at which you receive a
2:1 block.

Resistance in Parallel (R) - ANSWER = (R1 * R2)/(R1 + R2)

Minute ventilation = tidal volume x respiratory rate.

Stored Capacitor Energy = 0.5 * C * V^2.