CALC Mech Power – Critical Care Info

Gattinoni Mechanical Power — VCV (Long-form, I:E single slider)

Gattinoni Mechanical Power — VCV (Square Flow, Long-form)

Respiratory rate (RR): 15 breaths·min⁻¹

Tidal volume (V_T): 500 mL

Peak pressure (P_peak): 35.0 cmH₂O

Plateau pressure (P_plat): 25.0 cmH₂O

Total PEEP (PEEP_total): 10.0 cmH₂O

Inspiratory flow (Flow): 60 L·min⁻¹ (set 0 to derive from I:E)

I:E ratio: 1.0:2.0

10:11:11:10

Centre = 1:1, Left = 10:1 (inverse), Right = 1:10 (prolonged E). Step = 0.1

Uses PEEP_total (set + intrinsic) Square/constant inspiratory flow assumed Passive patient

Mechanical Power: — J·min⁻¹ flow: device

Work per breath: — J·breath⁻¹

Elastic power

— J·min⁻¹

= 0.098 × RR × ½ × (P_plat − PEEP_total) × V_T

Resistive power (long-form)

— J·min⁻¹

= 0.098 × RR × V_T² × (1/T_I) × (P_peak − P_plat)/Flow

PEEP power

— J·min⁻¹

= 0.098 × RR × PEEP_total × V_T

E_rs

— cmH₂O·L⁻¹

=(P_plat−PEEP_total)/V_T

R_aw

— cmH₂O·s·L⁻¹

=(P_peak−P_plat)/Flow

Flow

— L·s⁻¹

from device

T_I

— s

= (60/RR) × (I/(I+E))

Implemented long-form (VCV, square flow):

MP = 0.098 × RR × { V_T² [ ½ × (P_plat − PEEP_total)/V_T + (1/T_I) × (P_peak − P_plat)/Flow ] + V_T × PEEP_total }

with T_I = (60/RR) × I/(I+E). If Flow = V_T/T_I (true square flow), the resistive part reduces to (P_peak−P_plat)·V_T.

Pressures: cmH₂O; V_T: litres (slider shows mL); Flow slider is L·min⁻¹ (set to 0 to derive from I:E). 0.098 converts cmH₂O·L·min⁻¹ → J·min⁻¹.

26/09/2025

| Category: Calculators