Driving Pressure and Survival in the Acute Respiratory Distress Syndrome Marcelo B.P. Amato, M.D., Maureen O. Meade, M.D., Arthur S. Slutsky, M.D., Laurent Brochard, M.D., Eduardo L.V. Costa, M.D., David A. Schoenfeld, Ph.D., Thomas E. Stewart, M.D., Matthias Briel, M.D., Daniel Talmor, M.D., M.P.H., Alain Mercat, M.D., Jean-Christophe M. Richard, M.D., Carlos R.R. Carvalho, M.D., and Roy G. Brower, M.D. N Engl J Med 2015; 372:747-755 February 19, 2015 DOI: 10.1056/NEJMsa1410639 BACKGROUND Mechanical-ventilation strategies that use lower end-inspiratory (plateau) airway pressures, lower tidal volumes (V T ), and higher positive end-expiratory pressures (PEEPs) can improve survival in patients with the acute respiratory distress syndrome (ARDS), but the relative importance of each of these components is uncertain. Because respiratory-system compliance (C RS ) is strongly related to the volume of aerated remaining functional lung during disease (termed functional lung size)...
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ReplyDeleteOXYGEN CYLINDER ENDURANCE CALCULATION FORMULA
ReplyDeleteduration of flow in minutes = (gauge pressure-safe residual pressure) x constant/ flow rate in liters per minute
safe residual pressure:200
constants:
D cylinder 0.16
E cylinder 0.28
M cylinder 1.56
H cylinder 3.14
For example, a "D" oxygen cylinder with an available cylinder pressure of 1800 p.s.i.(2000-200) has 288 litters of available oxygen (1800 x 0.16 = 288).
Remember that the available liters do not include the oxygen that is still left in the
cylinder when the safe residual level is reached.