Hypoxaemia: Reversible Causes of Cardiac Arrest

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Hypoxaemia is the reduction in oxygen partial pressure values dissolved in arterial blood (PaO2) and arterial oxygen saturation (SaO2) (Pruitt, 2004). Pa02 is best measured by arterial blood gas (ABG) analysis, while SaO2 can be routinely assessed using a non-invasive test called pulse oximetry.

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<p>Reversible Causes of Cardiac Arrest - 4Hs and 4Ts: Hypoxaemia This is the first explainer in a series of eight, outlining reversible causes of cardiac arrest. What is Hypoxaemia? Hypoxaemia is the reduction in the values for partial pressure of oxygen dissolved in arterial blood (PaO2) and arterial oxygen saturation (SaO2) (Pruitt, 2004). Pa02 is best measured by arterial blood gas (ABG) analysis, while SaO2 can be routinely assessed using a non-invasive test called pulse oximetry. During nursing assessment, hypoxaemia should be considered if a patient has a respiratory rate greater than 24 per minute, and arterial oxygen saturations (SaO2) </p>


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Meet the educators

Cheryl Prescott
Cheryl is a Nurse Educator, living in Brisbane, Australia, with an extensive background in clinical nursing across multiple specialties, including coronary care, cardiology and acute medicine. She is a passionate advocate for accessible, meaningful education, quality and research that supports nursing practice and improves patient care. She is a major proponent of the #FOANed movement, which advocates creation, curation and sharing of free, open-access nursing education resources via social media. She is also involved in an international campaign, #WhyWeDoResearch, as she strongly believes that involvement in research, at whatever level possible, is a key responsibility of all healthcare professionals. Only by investing time, energy and resources in sharing and developing our knowledge can we move forward and meet our future challenges.
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Ausmed’s editorial team is committed to providing high-quality, well-researched and reputable education to our users, free of any commercial bias or conflict of interest. All education produced by Ausmed is developed in consultation with healthcare professionals and undergoes a rigorous review process to ensure the relevancy of all healthcare information and updates to changes in practice. If you have identified an issue with the education offered by Ausmed or wish to submit feedback to Ausmed's editorial team, please email with your concerns.
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733 reviews by Ausmed Learners
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Anne Domingo
02 May 2020
great resource!
Susan Turay
07 May 2020
The algorithm notes that the reversible causes of arrest typically result in a non- shockable rhythm, Performing CPR takes precedence over treating the reversible causes within the first two minutes. The reversible causes of cardiac arrest can classified into two categories which are the H's and T's. They are : Hypoxia- is life threatening when the lungs do not function or provide enough oxygen to maintain perfusion to the tissues. That will lead to stress, lactic acid build up all over the body thus causing tissue death and the loss of electrical activity.To treat HYPOXIA,establish an advanced airway,rescue breaths, CPR and oxygen therapy. Hypovolemia- loss of bodily fluid typically blood,traumatic blood loss,gastrointestinal bleeding,severe diarrhoea,vomiting,ongoing dehydration and extreme sweating in the form of decrease blood flow. To treat ,administer plasma,IV fluids,blood and clotting factors( Accessed 7/04/2020
Irma Millan
10 May 2022
Registered Nurse
great information
18 Sep 2020
Informative and quick
Haiyan Wu
04 May 2020
Very informative.
Kathryn Newbon
08 Apr 2021
This was a good reinforcement of knowledge of text and clinical lab learning this semester.
Bree ashman
02 May 2020
Dominic Wade
16 May 2020
A good short article
Leanne Sullivan
18 Apr 2023
Great information
Pamela Boyd
04 Oct 2022
Registered Nurse
Excellent, very worthwhile for 6 minutes. Thank you!
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