ANZCOR GUIDELINE 5 – BREATHING
Who does this guideline apply to?
This guideline applies to all persons in need of resuscitation.
Who is the audience for this guideline?
This guideline is for use by bystanders, first aiders or first aid providers, first responders and health professionals.
The Australian and New Zealand Committee on Resuscitation (ANZCOR) make the following recommendations:
- Persons who are gasping or breathing abnormally and are unresponsive require resuscitation.
- When assessing breathing, rescuers should look, listen and feel: LOOK for movement of the upper abdomen or lower chest; LISTEN for the escape of air from nose and mouth; and FEEL for movement of air at the mouth and nose.
- The ratio of compressions to rescue breaths is 30:2.
- Mouth to mouth, mouth to nose, and mouth to mask are all viable methods of rescue breathing. Mouth to stoma should be used where a person has had a laryngectomy.
- Risk of disease transmission is very low and rescuers need not be deterred from providing rescue breaths without a barrier device. However, rescuers should consider using a barrier device if this is available.
- Those who are trained and willing to give rescue breaths do so for all persons who are unresponsive and not breathing normally.
Normal breathing is essential to maintaining life. A person who is gasping or breathing abnormally and are unresponsive require resuscitation.(1)
1 Causes of Ineffective Breathing of Acute Onset
Breathing may be absent or ineffective as a result of:
- direct depression of, or damage to, the breathing control centre of the brain
- upper airway obstruction
- paralysis or impairment of the nerves and/or muscles of breathing
- problems affecting the lungs
2 Assessment of Breathing
There is a high incidence of abnormal gasping (agonal gasps) after cardiac arrest.1,4 [LOE IV] All rescuers should use a combination of unresponsiveness and absent or abnormal breathing to identify the need for resuscitation.1,4 [Class A; LOE: Expert consensus opinion]
The rescuer should maintain an airway and assess for normal breathing:
- LOOK for movement of the upper abdomen or lower chest
- LISTEN for the escape of air from nose and mouth
- FEEL for movement of air at the mouth and nose.
Movement of the lower chest and upper abdomen does not necessarily mean the person has a clear airway. Impairment or complete absence of breathing may develop before the person loses consciousness. [Class A; Expert Consensus Opinion]
3 Rescue Breathing
If the unconscious person is unresponsive and not breathing normally after the airway has been opened and cleared, the rescuer must immediately begin chest compressions and then rescue breathing. Give 30 compressions and then two breaths, allowing about one second for each ventilation following the ANZCOR Basic Life Support Flowchart (Guideline 8). 1,2,4 [Class A; LOE III-2]
ANZCOR suggests that those who are trained and willing to give breaths do so for all persons who are unresponsive and not breathing normally^4 [COSTR 2015 weak recommendation, very low quality of evidence].
3.1 Mouth to mouth
Kneel beside the victim’s head. Maintain an open airway (refer to ANZCOR Guideline 4 Airway).
Take a breath, open your mouth as widely as possible and place it over the person’s slightly open mouth. While maintaining an open airway, pinch the nostrils (or seal nostrils with rescuer’s cheek) and blow to inflate the person’s lungs. Because the hand supporting the head comes forward some head tilt may be lost and the airway may be obstructed. Pulling upwards with the hand on the chin helps to reduce this problem.
For mouth to mouth ventilation, it is reasonable to give each breath in a short time (one second) with a volume to achieve chest rise regardless of the cause of cardiac arrest.^1 [Class B; LOE IV, extrapolated evidence] Care should be taken not to over-inflate the chest. [LOE: Expert Consensus Opinion]
Look for rise of the chest during each inflation. If the chest does not rise, possible causes are:
- obstruction in the airway (tongue or foreign material, or inadequate head tilt, chin lift)
- insufficient air being blown into the lungs
- inadequate air seal around mouth and or nose.
If the chest does not rise, ensure correct head tilt, adequate air seal and ventilation. After inflating the lungs, lift your mouth from the person's mouth, turn your head towards their chest and listen and feel for air being exhaled from the mouth and nose.
3.2 Mouth to nose
The mouth to nose method may be used:
- where the rescuer chooses to do so
- where the person’s jaws are tightly clenched
- when resuscitating infants and small children.
The technique for mouth to nose is the same as for mouth to mouth except for sealing the airway. Close the mouth with the hand supporting the jaw and push the lips together with the thumb. Take a breath and place your widely opened mouth over the person's nose (or mouth and nose in infants) and blow to inflate the lungs. Lift your mouth from the person’s nose. Look for the fall of the chest, and listen and feel for the escape of air from the nose and mouth.
If the chest does not move, there is an obstruction, an ineffective seal, or insufficient air being blown into the lungs. In mouth-to-nose resuscitation a leak may occur if the rescuer’s mouth is not open sufficiently, or if the person’s mouth is not sealed adequately. If this problem persists, use mouth-to-mouth resuscitation. If blockage of the nose prevents adequate inflation, the rescuer should use mouth-to-mouth resuscitation. 1,2. [Class A; LOE IV]
3.3 Mouth to mask
Mouth to mask resuscitation is a method of rescue breathing which avoids mouth-to-mouth contact by using a resuscitation mask. Rescuers should take appropriate safety precautions when feasible and when resources are available to do so, especially if a person is known to have a serious infection (e.g. HIV, tuberculosis, Hepatitis B virus or SARS)^3. [Class A; LOE IV]
Position yourself at the person's head and use both hands to maintain an open airway and to hold the mask in place to maximise the seal. Maintain head tilt and chin lift. Place the narrow end of the mask on the bridge of the nose and apply the mask firmly to the face (Figure 1).
Inflate the lungs by blowing through the mouthpiece of the mask with sufficient volume and force to achieve chest movement. Remove your mouth from the mask to allow exhalation.
Turn your head to listen and feel for the escape of air. If the chest does not rise, recheck head tilt, chin lift and mask seal.
Failure to maintain head tilt and chin lift is the most common cause of obstruction during resuscitation.
Figure 1: Mouth to Mask method
(Reproduced Courtesy of European Resuscitation Council)
3.4 Mouth to neck stoma
A person with a laryngectomy has had the larynx (voice box) removed and breathes through a hole in the front of their neck (stoma). A stoma will be more obvious when the person is on their back for Rescue Breathing and the head is put into backward tilt. If a tube is seen in the stoma, always leave it in place to keep the hole open for breathing and resuscitation.
The rescuer should place their mouth over the stoma and perform rescue breathing as described above. If the chest fails to rise, this may be due to a poor seal over the stoma, or the person having a tracheostomy rather than laryngectomy thus allowing air to escape from the mouth and nose or a blocked stoma or tube. If stoma or tube is blocked use back blows and chest thrusts in an attempt to dislodge the obstruction (Refer to Guideline 4). [Class A; LOE Expert Consensus Opinion]
No human studies have addressed the safety, effectiveness, or feasibility of using barrier devices to prevent person-to-rescuer contact during rescuer breathing.^3 Nine clinical reports advocate the use of barrier devices to protect the rescuer from transmitted disease: three studies showed that barrier devices can decrease transmission of bacteria in controlled laboratory settings.^3 [Class A;LOE extrapolated evidence]
The risk of disease transmission is very low and need not deter rescue breathing without a barrier device. If available, rescuers should consider using a barrier device.^3 [Class A; LOE IV, extrapolated evidence]
- Koster RW, Sayre MR, Botha M, Cave DM, Cudnik MT, Handley AJ, Hatanaka T, Hazinski MF, Jacobs I, Monsieurs K, Morley PT, Nola JP, Travers AH. Part 5: Adult basic life support: 2010 International consensus on cardiopulmonary resuscitation and emergency cardiovascular care science with treatment recommendations. Resuscitation 2010;81:e48–e70.
- de Caen AR, Kleinman ME, Chameides L, Atkins DL, Berg RA, Berg MD, Bhanji F, Biarent D, Bingham R, Coovadia AH, Hazinski MF, Hickey RW, Nadkarni VM, Reis AG, Rodriguez-Nunez A, Tibballs J, Zaritsky AL, Zideman D, On behalf of the Paediatric Basic and Advanced Life Support Chapter Collaborators. Part 10: Paediatric basic and advanced life support: 2010 International Consensus on Cardiopulmonary Resuscitation and Emergency Cardiovascular Care Science with Treatment Recommendations. Resuscitation 2010;81:e213–e259.
- Soar J, Mancini ME, Bhanji F, Billi JE, Dennett J, Finn J, Ma MHM, Perkins GD, Rodgers DL, Hazinski MF, Jacobs I, Morley PT, on behalf of the Education, Implementation, and Teams Chapter Collaborators. Part 12: Education, implementation, and teams: 2010 International Consensus on Cardiopulmonary Resuscitation and Emergency Cardiovascular Care Science with Treatment Recommendations. Resuscitation 2010;81:e288–e330. http://www.resuscitationjournal.com
- Perkins GD, Travers AH, Berg RA, Castren M, Considine J, Escalante R et al. Part 3: Adult basic life support and automated external defibrillation. 2015 International Consensus on Cardiopulmonary Resuscitation and Emergency Cardiovascular Care Science With Treatment Recommendations. Resuscitation. 2015; 95: e43-e
ANZCOR Guideline 10.1 Basic Life Support Training