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Oxygen therapy in acute coronary syndrome: current NICE recommendations

Pankaj Garg
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DOI: https://doi.org/10.7861/clinmedicine.11-6-628a
Clin Med December 2011
Pankaj Garg
Cardiology and Cardiothoracic Department, Northern General Hospital, Sheffield
Roles: Specialist registrar in cardiology
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Editor–I read with great interest the concise guidance by O'Driscoll and colleague (Clin Med August 2011, pp 372–5) on emergency oxygen use in adult patients. Oxygen therapy is widely used in both acute and chronic cardiac care. Traditionally for decades, any patient presenting with chest pain is instantaneously administered high flow oxygen. This concept originally started as we realised oxygen could ease angina pain.1 It was subsequently believed that this would ease myocardial ischaemia in patient's presenting with acute coronary syndrome (ACS). It quickly became norm to administer high-flow oxygen therapy to patients presenting with acute chest pain.

However, more recently, there have been many reports of harmful effects of high-flow oxygen in ACS patients where the patient might not be hypoxic. High flow oxygen has been shown previously to reduce cardiac output,2 attribute to arterial vasoconstriction3–5 and also to increase systemic vascular resistance.6 More recently, two systematic reviews suggest that the routine use of high-flow oxygen in uncomplicated myocardial infarction may result in a greater infarct size and possibly increase the risk of mortality.7,8

The Resuscitation Council UK, the National Institute for Health and Clinical Excellence and the British Thoracic Society have recently appreciated this concern of oxygen therapy in ACS patients and have changed their guidance accordingly. They all now suggest that oxygen therapy should be reserved for ACS patients with hypoxia (O2 saturation below 94%).

From my current clinical experience, oxygen is still widely administered to ACS patients without hypoxia. This practice needs to change across the NHS and it will only happen with constant multidisciplinary education and the introduction of local oxygen prescription guidance in ACS patients.

Footnotes

  • Please submit letters for the editor's consideration within three weeks of receipt of Clinical Medicine. Letters should ideally be limited to 350 words, and sent by email to: clinicalmedicine{at}rcplondon.ac.uk

  • © 2011 Royal College of Physicians

References

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    High oxygen pressure and the retinal blood vessels Lancet 1964 2 291–2
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    (2010) Oxygen therapy for acute myocardial infarction. Cochrane Database Syst Rev 6, p CD007160.
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    Routine use of oxygen in the treatment of myocardial infarction: systematic review Heart 2009 95 198–202doi:10.1136/hrt.2008.148742
    OpenUrlAbstract/FREE Full Text
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Oxygen therapy in acute coronary syndrome: current NICE recommendations
Pankaj Garg
Clinical Medicine Dec 2011, 11 (6) 628-629; DOI: 10.7861/clinmedicine.11-6-628a

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Oxygen therapy in acute coronary syndrome: current NICE recommendations
Pankaj Garg
Clinical Medicine Dec 2011, 11 (6) 628-629; DOI: 10.7861/clinmedicine.11-6-628a
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