Category: Respiratory

COVID-19 (40 Step Desaturation Test)

NHS England has introduced the use of a “40 step desaturation test” into discharge planning from the ED. You will have heard Covid -19 patients complaining of increasing SOB on exercise, and it’s important that we test this prior to discharge.

Method:

  • Is this appropriate? – Could the patient walk 40 steps before they were ill?
  • Patient remains in cubical – with mask on
  • Attach Sats probe – ensure good trace
  • Walk on spot 40 steps 
  • Monitor SaO2

 

 

COVID-19 (Awake Self-Proning)

There is increasing evidence that Awake Self-Proning of our Covid-19 patients can improve oxygenation. Proning the patient can has several effects which can dramatically improve their SaO2

  • Improves Ventilation to back of the lung (the back of the lung contains more alveoli than the anterior lung)
  • Improves Perfusion – as blood supply to the back of the lung is always better than the front
  • Improves Clearance of secretions
  • Be patient can take 15-20min

Contraindications (all seem obvious)

Absolute contraindications:

  • Respiratory distress (RR ≥ 35, PaCO2 ≥ 6.5, accessory muscle use) 
  • Immediate need for intubation 
  • Haemodynamic instability (SBP < 90mmHg) or arrhythmia 
  • Agitation or altered mental status 
  • Unstable spine/thoracic injury/recent abdominal surgery 

Relative Contraindications: 

  • Facial injury 
  • Neurological issues (e.g. frequent seizures) 
  • Morbid obesity 
  • Pregnancy (2/3rd trimesters) 
  • Pressure sores / ulcers 

 

Acidosis & VBG’s

We are frequently asked to check the lactate on Venous Blood Gases (VBG’s), by the nursing staff. However, remember to look at the first result (pH) it is the most important.

Acidosis: Unless you have a good reason (e.g. you know its due to DKA) you should be investigating and performing an Arterial Blood Gas (ABG)

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Pulmonary Embolism in Pregnancy

Unfortunately the the normal pathway for investigation of PE performs poorly in pregnancy RCOG have the following pathway

1. Investigation – of suspected PE

  • Clinical assessment – its all on the history and exam scoring doesn’t work
  • Perform the following tests:
    • CXR – sheilding can protect the baby and may avoid further radiation
    • ECG
    • Bloods: FBC, U&E, LFTs, Clotting
  • Commence Tinzaparin (unless treatment is contraindicated – use booking weight to calculate dose) –[BNF]