ALS algorithm

- Interpreting the ECG

A rhythm strip has been recorded to help determine the next course of action. Use the 6-stage approach to interpret the rhythm strip. Examine each image and select your responses. When you are ready, select confirm to receive your feedback.

Case 1

An ECG rhythm strip
  • 1. Is there any electrical activity?

Case 2

  • 2. Is the ventricular (QRS) rate normal?
  • 3. Is the QRS rhythm regular?
  • 4. Is the QRS complex width normal?

Case 3

An ECG from the patient.
  • 5. Is atrial activity present?

References

See chapter 11 of the ALS manual for further reading about the tachycardia algorithm.

Essentials: Components of a normal ECG rhythm strip

  • Depolarisation begins in the SA node and then spreads through the atrial myocardium.
  • This depolarisation is recorded on the rhythm strip as the P wave. The heart responds to this electrical stimulus byatrial contraction.
  • The small isoelectric segment between the P wave and QRS complex represents the delay in transmission through the AV node.
  • Depolarisation of the bundle of His, bundle branches and ventricular myocardium is shown on the rhythm strip as the QRS complex.
  • The T wave represents recovery of the resting potential (repolarisation) in the cells of the conducting system and ventricular myocardium.

<p>Components of a normal ECG complex.</p><p></p>

Algorithm: The tachycardia algorithm

The tachycardia algorithm is available in chapter 11 of the ALS manual.

The tachycardia algorithm is available in chapter 11 of the ALS manual.

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