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Summary - Critical Care Nursing: ECG/EKG R569,96
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Summary - Critical Care Nursing: ECG/EKG
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  • Course
  • Critical Care Nursing- ECG
  • Institution
  • The University Of Hong Kong
  • Book
  • The ECG Made Easy

- Critical Care Nursing: ECG/EKG - Prepared by experienced RN Ms. Chan (BNurs (First Hon, CGPA 3.8/4.0), MPH) - Provide a thorough introduction to ECG/EKG interpretation for nursing students and other healthcare professionals with no or little experience. Start with an introduction to anatomy and...

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Document information

  • Yes
  • February 19, 2021
  • 67
  • 2020/2021
  • Summary

Subjects

  • ecg
  • critical care
  • nursing
  • ekg
  • advance nursing

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  • The University Of Hong Kong
  • Critical Care Nursing- ECG
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CRITICAL CARE NURSING NOTES
<TOPICS: ECG>




By Rachel Chan (RN)

Graduated from top university in HK with BNurs(First Hon, CGPA:

3.8/4.0) and MPH degree




By Rachel Chan (RN, BNurs(First Hon), MPH)

, ECG

Cardiac action potential(ventricular myocardial cell)
 Absolute Refractory period during repolarization

 Two type of cell

 Pacemaker cell: automaticity, regularity, excitability, conductivity i.e. SA, AV, purkinje, bundle of his – can

only initiate pace, but not contraction

 Myocardial cell: contractility – can only contract




By Rachel Chan (RN, BNurs(First Hon), MPH)

,  5 Phases of myocyte (blue line):

 0: depolarization, activation of NA+ channel -> NA+

 1: inactivation of the Na+ by the inner gate

 2: plateau- K+ out, recovery of cell to original stat

 3: rapid repolarization- K+ channel, ca++ pump out by three means

 4: flat isoelectric line.

 Phase 0,1,2 involve Na, K gate, responsible for the QRS(i.e. ventricular depolarization)

 ca responsible for repolarization, ST &T

 polarization ≠ contraction, QRS only mean the ventricular depolarization


Contraction and relaxation of heart(cardiomyocytes)




By Rachel Chan (RN, BNurs(First Hon), MPH)

, Refractory period




 resist to cell membrane stimulus  prevent cardiac spasm/tetany

 absolute RP( QRS + upslope T): absolute no response

 Relative RP(downslope T): vulnerable period as some cells are repolarized already  respond to strong

than normal stimulus

  R on T phenomenon: QRS can land on the downslope T  VF




 Supernormal period(after T): a weaker than normal stimulus can result in depolarization dysrhythmia


ECG background:
 SA node -> atrium -> AV node -> bundle of his -> left  right bundle branches -> Purkinje fibers ->

ventricles syncytium

 Lead: electrical pic of heart from diff direction; ≠electrode

 Sinus rhythm: electrical activation begin in the SA node

 Cardiac rhythm is identified from whichever lead with the P wave most clearly: Lead II commonly , but lead

I is preferred if severe respiratory s/s(which may affect ECG)

By Rachel Chan (RN, BNurs(First Hon), MPH)

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