Bronchiolitis: Recognise and Assess
Published on the 29 May 2016
Published on the 29 May 2016
Starship Hospital’s Clinical Guidelines define bronchiolitis as ‘A viral lower respiratory infection which affects children, usually under 12 months of age, with younger infants often more severely affected’ The literal translation of bronchiolitis is ‘ inflammation of the bronchioles’.
Respiratory syncytial virus (RSV) is one of the most common causes of bronchiolitis, though other respiratory virus’s, such as parainfluenza and adenovirus, can also lead to the infection. It is the most common reason for children under twelve months to be admitted to hospital and is a leading cause of morbidity in this age group.
Children presenting with bronchiolitis may have a fever. They often have a cough and sometimes an audible wheeze or ‘crackles’ on auscultation of the chest. Signs of respiratory distress/work of breathing, such as tracheal tug, nasal flaring, recession and head bobbing in infants are usually present. Vital signs will show tachypnoea, tachycardia and on occasion, hypoxia. Due to the thick secretions associated with bronchiolitis babies may have difficulty feeding. Secretions block the nares making breast and bottle feeding difficult. Babies struggle to breath and feed at the same time and can tire quickly.
The natural course of the illness lasts for seven to ten days, with symptoms worsening on days three and four. The duration of illness is important when assessing severity of illness and the potential for children to become sicker. If you have a sick looking baby on day one or two, then it is likely that they will worsen over the course of the following days.
|Wheeze||None or end expiratory||Entire expiration||Inspiratory & expiratory|
|Feeding||Normal||Less than usual.
Frequently stops feeding.
More than 1/2 normal feeds.
Less than 1/2 normal feeds.
|Oxygen||No oxygen requirement||May require oxygen||Requires oxygen|
|Indrawing||No/ mild indrawing||Intercostal and/or tracheosternal||Severe with nasal flaring|
|Behaviour||Normal||Some/ intermittent irritability||Irritability and/or lethargy|
|Behaviour||Normal||Some/ intermittent irritability||Increasing irritability and/ or lethargy/ fatigue|
|Respiratory Rate||Normal||Increased respiratory rate
|Marked increase or decrease
|Accessory Muscle Use||None or minimal||Moderate chest wall retraction||Marked chest wall retraction|
|Feeding||Normal||May have difficulty with feeding or reduced feeding||Reluctant or unable to feed|
|Oxygen||No oxygen requirement
(Sa02 > 93%)
|Mild hypoxemia corrected by oxygen*
|Hypoxemia, may not be corrected by oxygen*
|Apnoeic Episodes||None||May have brief apnoeas||May have increasingly frequent or prolonged apnoeas|
Bronchiolitis is caused by a virus and therefore does not respond to antibiotics. Salbutamol has shown to be ineffective in alleviating wheezing. The mainstay of bronchiolitis treatment is the management of symptoms. Minimal handling and a calm, quiet environment has been a long recommended strategy. The more the child becomes distressed, the more they experience respiratory problems.
Normal saline drops to the nares helps loosen secretions to allow feeding. Occasional nasal suctioning may be required. Babies who have severe difficulty feeding may require nasogastric (NG) feeding, either by continuous feed or by bolus feeding. This is often preferable to intraventricular (IVT), as babies still feel hungry and may caused further distress. Of note, frequent small feeds are often preferred over large feeds (either oral or NG) as a distended abdomen can also put pressure on immature lungs and increase respiratory distress.
Nebulised three per cent hypertonic saline is occasionally used. The theory is that this delivery mode will loosen secretions and aid air entry. Although used fairly widely there has been limited evidence for this treatment’s effectiveness. A recent Cochrane review however, did note that hypertonic has been shown to reduce the length of a hospital stay in some infants. Specialised solution should be made up by a pharmacy department.
High flow nasal oxygen is also an emerging treatment in infants with bronchiolitis. This method is used to provide positive end-expiratory pressure (PEEP) and avoid nasal irritation often caused by ‘dry’ oxygen alone. Occasionally administered in the emergency department, it appears to provide relief to infants, and once the nasal cannulas are tolerated, babies seem to settle well. A large prospective randomised control trial is currently underway in Australasia looking at the use of high flow on infants with bronchiolitis.
Bronchiolitis is one of the leading causes of hospitalisation of children under twelve months of age. Knowing how to recognise the severity of infection and manage its symptoms will help nurses to provide the best patient care, particularly in the coming winter months, when the illness is most prevalent.
[show_more more=”Show References” less=”Hide References” align=”center” color=”#808080″]
Abbie is a Nurse Practitioner currently working in a Specialist Allergy Clinic in Brisbane. She has been a paediatric nurse for over 20 years originally working in the UK before moving to Australia with her young family 8 years ago. Abbie has a diverse career working with some of the most vulnerable patients. She has worked in paediatric oncology , emergency and general paediatrics. She has worked for NGO's in the fields of child protection and parental support as well as currently working with re- settled refugees. Abbie is a passionate nursing advocate and has just started the new challenge of blogging.