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Acute Management of Asthma

Discussion in 'Emergency Medicine' started by Egyptian Doctor, Dec 25, 2014.

  1. Egyptian Doctor

    Egyptian Doctor Moderator Verified Doctor

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    Airway
    Is the patient able to talk? - if so the airway is patent

    Noisy breathing suggests airway compromise
    • Perform Head tilt, Chin lift
    • If noisy breathing persists try a Jaw Thrust
    • If airway still appears compromised use an airway adjunct
    • Use a Oropharyngeal Airway (Guedel) if unconscious, otherwise they may gag & aspirate vomit
    • Or alternatively use a Nasopharyngeal airway (well tolerated if patient is somewhat conscious)
    Breathing
    Sit up in bed

    Give High Flow Oxygen via a Non-rebreathe mask – 15 Litres – 100%

    Give nebulised bronchodilators:

    • Salbutamol 5mg Nebulised – repeat every 15 mins if life threatening features present¹
    • Ipratropium Bromide 500mcg Nebulised – every 4-6 hours¹

    Assess

    • Respiratory rate
    • Oxygen saturation – aim to keep as high as possible (94-98%) – if <92% this is life threatening
    • Air entry (auscultation) - pleural rub may be present in PE, absent breath sounds in pneumothorax
    • Percussion – hyper-resonance may suggest pneumothorax
    • Expansion – may be unilaterally reduced in pneumonia with consolidation
    • Peak flow – useful to assess severity/ response to treatment -repeat every 15-30 mins


    Chest X-ray - rule out pneumothorax – portable CXR machine – don’t delay treatment whilst waiting

    [Broken External Image]:http://geekymedics.com/wp-content/u...-Screenie-at-2012-06-27-00-02-251-600x377.png
    Grading of severity of asthma in adults – SIGN guidelines²

    Circulation
    Assess

    • BP
    • Capillary Refill Time - central (as may be peripherally shut down) – should be <2 seconds
    • Pulse
    • ECG – patient may have rhythm problem contributing to shortness of breath – e.g. Fast AF

    Gain IV access – large bore cannula – e.g. 14 Gauge

    Take blood samples - FBC, U&E, LFT, Clotting, CRP, Cultures

    Perform regular ABG’s:

    • PaO2 – is there type 1 respiratory failure? (<8.0kPa)
    • pH – may be alkylotic initially due to hyperventilation, acidosis is a poor prognostic sign
    • PaCO2 – often low due to hyperventilation – if rising patient likely needs ITU support (CPAP)

    Give

    • Hydrocortisone- 100mg IV (can alternatively give oral prednisolone 40-50mg)¹

    If patient still not stable then ITU/Anaesthetist/Seniors need calling to attend immediately

    You can institute the following treatment after discussion with your senior (i.e. whilst they’re on their way)

    • Magnesium Sulphate – 1.2-2.0g IV over 20 minutes¹

    Once Seniors/ITU involved then the following may be tried:

    • Aminophylline – not a drug you would start as a junior doctor – need cardiac monitoring for arrhythmias
    If no improvement or life threatening features are present consider intubation & ITU transfer

    Disability
    Assess AVPU - reduced consciousness may indicate severe hypoxia / hypercapnia

    Assess Pupils - constricted in opiate overdose, dilated in TCA overdose, blown in brain pathology

    Exposure
    Expose patients entire body looking for

    • Rash – seen in anaphylaxis, meningococcal septicaemia
    • Hidden sources of bleeding
    • Hidden sources of sepsis / infection - i.e.infected leg ulcer
    • Other secondary injuries
    • Hot swollen calf may suggest DVT – important if PE suspected
    Reassess ABCDE
    Important to keep reassessing ABCDE

    Allows you to recognise if the treatment you have initiated is working

    Also allows fast recognition that the patient is not responding to treatment & is deteriorating

    If patient continues to deteriorate, seniors/ITU need to be involved sooner rather than later

    Further management
    Once the patient is stabilised they will need admitting to a ward

    If infective source is found then appropriate antibiotics should be initiated

    They will require regular observations – PEFR/Oxygen saturations/RR

    Record PEFR before & after salbutamol at least 4 times whilst in hospital¹

    Wean down & stop aminophylline over 12-24hrs (if initially started on it)¹

    Reduce nebulised bronchodilators (Salbutamol & Ipratropium) – switch to inhaled Salbutamol

    Wean off oral steroids gradually & initiate inhaled corticosteroid (Beclamethasome)

    Continue to monitor PEFR, looking out for early signs of deterioration on reduced treatment

    Investigate underlying cause of acute exacerbation of asthma – allergic? infective?

    [​IMG]

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