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Operating & troubleshooting a self inflating bag © Victorian Newborn Resuscitation Project Updated February 2012
Six key steps to success Step 1 Choose the correct size self inflating bag for newborn resuscitation: a 240 mL bag Step 2 Choose the correct sized mask according to the size of the newborn infant Step 3 Assemble the bag and mask, ensuring that all the valves are present and inserted correctly Updated February 2012 © Victorian Newborn Resuscitation Project
Six key steps to success Step 4 Test the functionality of the bag and mask Step 5 Create a good seal between the infant’s face and the mask using the “two point top hold” Step 6 Continually reassess your ventilation technique to ensure ventilation is effective Updated February 2012 © Victorian Newborn Resuscitation Project
Choose the correct size bag The 240 mL self inflating bag, is the most appropriate size for all newborn infants. Why? The tidal volume required by a newborn infant is approximately 5 – 10 mL/kg body weight, therefore a volume of 240 mL should be more than adequate to inflate any newborn’s lungs. (ARC & NZRC, 2010, Guideline 13.4) Step 1 Updated February 2012 © Victorian Newborn Resuscitation Project
Comparison of Laerdal™ adult, paediatric & ‘preterm’ bags Updated February 2012 © Victorian Newborn Resuscitation Project
Choose the correct size mask The rim of the mask should cover the tip of the chin, the mouth & the nose but not the eyes. It should not extend under the chin. If the mask is too big, a good seal cannot be achieved and effective ventilation will be impossible. Step 2 Updated February 2012 © Victorian Newborn Resuscitation Project
Assemble the Laerdal™ 240 mL ‘preterm’ ventilation bag Step 3
Test the bag before use Place the mask firmly against your hand. Squeeze the bag repeatedly. You should feel air pressure against your hand and see the lip valve open and close. If pressure is not felt, this device is not safe to use! Step 4 Updated February 2012 © Victorian Newborn Resuscitation Project
Check that the lip valve opens & closes with each squeeze of the bag Lip valve Updated February 2012 © Victorian Newborn Resuscitation Project
Disposable (single use) bags are tested the same way Updated February 2012 © Victorian Newborn Resuscitation Project
Test the pressure relief valve Remove the mask and occlude the patient port connector with your thumb. Compress the bag several times. Look & listen for opening of the pressure relief valve.
The pressure relief valve: (The “pop off” valve) The maximum pressure is limited to a factory setting which varies from 35 – 45 cmH 2 0 according to the manufacturer of the bag. A higher peak pressure (PIP) can be given by occluding the pressure relief valve whilst squeezing the bag. Be aware that pressure relief valves have been shown to activate at a wide range of pressures and well in excess of the factory setting of 35 – 45 cmH 2 0. (Ganga-Zandzou, et al.,1996) Unless you are using an in-line pressure manometer, you will not know how much peak pressure you are delivering with each inflation. Updated February 2012 © Victorian Newborn Resuscitation Project
Connect an oxygen source & check that the reservoir bag inflates At a flow rate of ≥ 5 L/min, 97 - 100% oxygen is delivered with or without the reservoir bag attached to the Laerdal bag. Removing the reservoir bag does not significantly reduce the oxygen concentration. (Thio, et al., 2009) Updated February 2012 © Victorian Newborn Resuscitation Project
Create a good seal between the infant’s face & the mask Position the infant’s head in a neutral position. Place a finger onto the chin tip (the “guide finger”). Line up the outer edge of the mask into the groove between the guide finger and the chin tip. Roll the mask onto the face from the chin upwards. Step 5 Updated February 2012 © Victorian Newborn Resuscitation Project
Holding the mask in place using the “two point top hold” Apply evenly balanced downward pressure onto the mask using the thumb and index finger positioned toward the outer edge of the flat area of the mask (“two point top hold”). Apply jaw lift with the remaining fingers so that the upward pressure works against the downward pressure from the two point top hold to create a good seal. Updated February 2012 © Victorian Newborn Resuscitation Project Wood, et al. (2008). Archives of Disease in Childhood, Fetal & Neonatal Edition, 93: p. F231
Incorrect ways to hold a mask A: Do not hold the stemB: Do not hold the outer edge Holding the mask by the stem (A) or by the outer edge of the rim (B) will result in a poor seal & significant mask leak × ×
Leak around face masks Leaks averaging 40% to 70% around face masks are common due to poor mask placement technique. It cannot be assumed that just because the mask is on the face that there is a good seal. Reference: Wood, et al. (2008). Archives of Disease in Childhood: Fetal & Neonatal Edition, 93: p. F231. Updated February 2012 © Victorian Newborn Resuscitation Project
Positive pressure ventilation rate Ventilate at a rate of 40 – 60 inflations per minute. Be aware: Hyperventilation can lead to dangerously low CO 2 levels (< 30 mmHg) in newborns with normal lungs. This can further depress their breathing centre and reduce cerebral blood flow. Avoid hyperventilation in newborns who are unlikely to have lung disease (e.g. a term infant with peripartum hypoxic ischaemia). Updated February 2012 © Victorian Newborn Resuscitation Project
Air or oxygen for resuscitation? Term newborns: Use air (21%) initially. Preterm newborns < 32 weeks: Use air or blended air and oxygen (21% to 30% oxygen to start). Use air if a blender is not available. Supplemental oxygen should be used judiciously, ideally guided by pulse oximetry. “The first priority is to ensure adequate inflation of the lungs, followed by increasing the concentration of inspired oxygen only if needed” (ARC & NZRC, 2010, Guideline 13.4) Updated February 2012 © Victorian Newborn Resuscitation Project
Is your technique effective? If your ventilation technique is effective, three signs are observed: An increase in the heart rate above 100/min. A slight rise and fall of the chest and upper abdomen with each inflation. An improvement in oxygenation. If the heart rate is not improving: The technique of ventilation needs to be improved. Consider increasing the PIP. Endotracheal intubation should also be considered. Step 6 Updated February 2012 © Victorian Newborn Resuscitation Project
References Australian Resuscitation Council & the New Zealand Resuscitation Council. (2010). Section 13: Neonatal Guidelines. Retrieved February 2, 2012 from: http://www.resus.org.au http://www.resus.org.au Ganga-Zoudou, P.S., Diependaele, J.F., Storme, L., Riou, Y., Klosowski, S., & Rakza, T, et al. (1996). Is Ambu bag ventilation a simple question of finger touch? Archives of Pediatrics, 3 (12), 1270 – 1272. Johnston, K.L., & Aziz, K. (2009). The self-inflating resuscitation bag delivers high oxygen concentrations when used without a reservoir: implications for neonatal resuscitation. Respiratory Care, 54 (12): 1665 – 1670. Laerdal Medical (2006) Laerdal silicone resuscitators: Interactive presentation. Accessed April 27, 2009 from http://www.laerdaltraining.com/lsr/http://www.laerdaltraining.com/lsr/ Updated February 2012 © Victorian Newborn Resuscitation Project
References Reise, K., Monkman, S., & Kirpalani, H. (2008). The use of the Laerdal infant resuscitator results in the delivery of high oxygen fractions in the absence of a blender. Journal of Resuscitation,2008.08.021. Thio, M., Bhatia, R., Dawson, J.A., & Davis, P.G. (2009). Oxygen delivery using neonatal self-inflating resuscitation bags without a reservoir. Archives of Disease in Childhood: Fetal & Neonatal Edition (online). Accessed June 7, 2010 from http://fn.bmj.com/content/early/2009/10/19/adc.2009.166462.abstract http://fn.bmj.com/content/early/2009/10/19/adc.2009.166462.abstract Wood, F.E., Morley, C.J., Dawson, J.A., Kamlin, C.O., Owen, L.S., Donath, S., & Davis, P.G. (2008). Improved techniques reduce face mask leak during simulated neonatal resuscitation. Study 2. Archives of Disease in Childhood: Fetal & Neonatal Edition, 93: F 230- F234. Updated February 2012 © Victorian Newborn Resuscitation Project
Disclaimer This teaching program has been developed by the Newborn Emergency Transport Service (NETS) Victoria as an educational program around neonatal care with the assistance of a grant from the Department of Health Victoria. Whilst appreciable care has been taken in the preparation of this material NETS shall not be held responsible for any act or omission which may result in injury or death to any baby as a result of reliance on this material. Updated February 2012 © Victorian Newborn Resuscitation Project
Copyright This presentation was developed by Rosemarie Boland on behalf of the Victorian Newborn Resuscitation Project (2012). The material is copyright NeoResus. This presentation may be downloaded for personal use but remains the intellectual property of NeoResus and as such, may not be reproduced or used for another training program without the written permission of the Victorian Newborn Resuscitation Project Executive. Please contact us at firstname.lastname@example.org@neoresus.org.au Updated February 2012 © Victorian Newborn Resuscitation Project
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