The changes in delivered oxygen fractions using laerdal resuscitator bag with different types of reservoir

One of the disadvantages of the Laerdal resuscitator bag is that it does not deliver a high concentration of oxygen without a reservoir and an appropriate technique of ventilation. With a specific device that is able to compress a resuscitator bag mechanically at a regular volume, ventilator rate, and speed, we evaluated the effects of various factors (the tidal volume, the ventilator rate, the oxygen flow rate, the type of reservoir) of the Laerdal resuscitator bag during positive pressure ventilation that affect the delivered oxygen fraction (FDO2) and also whether 250 mL and 500 mL corrugated tubes could be used as substitutes for the reservoir bag. The 250 mL corrugated tube increased the FDO2 to over 96% with an oxygen flow rate of 15 L/min. The 500 mL corrugated tube increased the FDO2 to over 96% with an oxygen flow rate of 10 L/min regardless of the ventilator rate at a fixed tidal volume of 500 mL. At the identical fixed tidal volume of 500 mL, the 1,600 mL reservoir bag increased the FDO2 to over 92% with an oxygen flow rate of 5 L/min and to over 96% at 7.5 L/min regardless of the ventilator rate. We concluded that the FDO2 of the Laerdal resuscitator bag depends on various factors such as tidal volume, ventilator rate, oxygen flow rate, and type of reservoir and both the 250 mL and 500 mL corrugated tubes can be used as substitutes.

The Changes in Delivered Oxygen Fractions Using Laerdal Resuscitator Bag with Corrugated Tubes / 대한마취과학회지

BACKGROUND: In emergency rooms or intensive care units, we have shown delivery of higher fractions of oxygen promptly for respiratory or cardiac arrest patients by using resuscitating instruments, especially the resuscitator bag. Previously we studied the variables affecting the fraction of delivered oxygen (FDO2) under varying ventilating techniques and conditions. In this paper, using corrugated tubes as substitute for reservoir bag, we measured FDO2 and compared two. METHODS: We designed a special wooden box, which held the Laerdal resuscitator bag. We measured the FDO2 with or without reservoir bags and corrugated tubes at various tidal volumes, respiration rates and oxygen flows. RESULTS: With a 500 ml corrugated tube, FDO2 were higher than with a 250 ml corrugted tube but lower than with a reservoir bag. CONCLUSIONS: Corrugated tube is less effective to deliver high fractions of oxygen than the reservior bag, but it is acceptable to use corrugated tube as a substitute for a reservior bag than not to use it at all.

The Study of Fraction of Delivered Oxygen in Laerdal Resuscitator Bag / 대한마취과학회지

BACKGROUND: Bag and mask devices are used frequently to provide patients with positive-pressure-assisted ventilation. One of the disadvantages is the fact that they do not deliver high concentrations of oxygen without special adaptors or attention to technique. In order to investigate the variables affecting oxygen delivery, we designed a study to determine the fractions of delivered oxygen (FDO2) under varying ventilating techniques and conditions. METHODS: We designed special wooden box, in which the Laerdal resuscitator bag had been. We measured the fractions of delivered oxygen with or without reservoir bag in various tidal volumes, respiration rates and oxygen flows. RESULTS: Without reservoir bag, the fractions of delivered oxygen were increased up to only 73% in spite of 15 l/min oxygen flow. With reservoir bag, the fractions of delivered oxygen were increased up to nearly 96% in 5-7.5 l/min oxygen flow. CONCLUSIONS: While using the Laerdal resuscitator bag, it is desirable to adapt reservoir bag and supply 5 l/min oxygen in conventional ventilation and 7.5 l/min in hyperventilation minimally for higher fraction of delivered oxygen.