ECG Rhythm Strip Interpretation

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Questions and Answers

What is the normal duration of a PR interval in seconds?

  • 0.4-0.5s
  • 0.12-0.2s (correct)
  • 0.08-0.11s
  • 0.2-0.3s

How many small boxes are equivalent to 1 second on the rhythm strip?

  • 25
  • 40
  • 20
  • 5 (correct)

What is the normal heart rate in beats per minute?

  • 60-100bpm (correct)
  • 80-120bpm
  • 50-80bpm
  • 70-90bpm

What is the purpose of the calibration signal on an ECG?

<p>To measure the amplitude of the QRS complex (C)</p> Signup and view all the answers

What is the significance of a negative S wave in a Precordial Lead?

<p>It is a feature of RV leads (B)</p> Signup and view all the answers

What is the normal duration of a QRS complex in seconds?

<p>0.08-0.11s (B)</p> Signup and view all the answers

What is the purpose of assessing the rhythm in an ECG?

<p>To determine if the heart rhythm is normal or abnormal (A)</p> Signup and view all the answers

What is the significance of a positive R wave in a Precordial Lead?

<p>It is a feature of LV leads (B)</p> Signup and view all the answers

The heart rate is considered normal if it is between _______ and _______ beats per minute.

<p>60-100</p> Signup and view all the answers

A small square on the rhythm strip is equal to _______ seconds.

<p>0.04</p> Signup and view all the answers

The PR interval should be between _______ and _______ seconds.

<p>0.12-0.2</p> Signup and view all the answers

The QRS duration should be between _______ and _______ seconds.

<p>0.08-0.11</p> Signup and view all the answers

A large square on the rhythm strip is equal to _______ seconds.

<p>0.2</p> Signup and view all the answers

The calibration signal on an ECG is equal to _______ millivolts.

<p>1</p> Signup and view all the answers

The average amplitude of QRS should be around the size of the _______ signal.

<p>calibration</p> Signup and view all the answers

The paper speed of the ECG is _______ millimeters per second.

<p>25</p> Signup and view all the answers

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Study Notes

Assessing the Rhythm Strip

  • 1 small square on the ECG paper represents 0.04 seconds, and 1 large square represents 0.2 seconds, which means 5 large squares equal 1 second

Assessing the Heart Rate

  • A normal heart rate is between 60-100 beats per minute (bpm)
  • Determine if the heart rate is regular or irregular

Assessing the Rhythm

  • Label P, QRS, and T waves and evaluate their shape and polarity
  • Ensure each P wave is associated with a QRS complex
  • Evaluate the timing of the rhythm

Intervals and Durations

  • A normal PR interval is between 0.12-0.20 seconds (3-5 small boxes)
  • A normal QRS duration is between 0.08-0.11 seconds (2-3 small boxes)

12-Lead ECG Evaluation

  • Evaluate the amplitude of the QRS complex, which should be around 1 mV (similar to the calibration signal)
  • Abnormal amplitude is considered >2mV

Orientation and Leads

  • In limb leads, identify the lead with the most positive QRS complex
  • In precordial leads:
    • Negative S waves are typically seen in right ventricular leads (V1-2)
    • Positive R waves are typically seen in left ventricular leads (V4+)

Additional Notes

  • Paper speed is 25 mm/s, which means a small box represents 0.04 seconds
  • Normal PR interval is between 0.12-0.20 seconds, and normal QRS duration is between 0.08-0.11 seconds

Assessing the Rhythm Strip

  • 1 small square on the ECG paper represents 0.04 seconds, and 1 large square represents 0.2 seconds, which means 5 large squares equal 1 second

Assessing the Heart Rate

  • A normal heart rate is between 60-100 beats per minute (bpm)
  • Determine if the heart rate is regular or irregular

Assessing the Rhythm

  • Label P, QRS, and T waves and evaluate their shape and polarity
  • Ensure each P wave is associated with a QRS complex
  • Evaluate the timing of the rhythm

Intervals and Durations

  • A normal PR interval is between 0.12-0.20 seconds (3-5 small boxes)
  • A normal QRS duration is between 0.08-0.11 seconds (2-3 small boxes)

12-Lead ECG Evaluation

  • Evaluate the amplitude of the QRS complex, which should be around 1 mV (similar to the calibration signal)
  • Abnormal amplitude is considered >2mV

Orientation and Leads

  • In limb leads, identify the lead with the most positive QRS complex
  • In precordial leads:
    • Negative S waves are typically seen in right ventricular leads (V1-2)
    • Positive R waves are typically seen in left ventricular leads (V4+)

Additional Notes

  • Paper speed is 25 mm/s, which means a small box represents 0.04 seconds
  • Normal PR interval is between 0.12-0.20 seconds, and normal QRS duration is between 0.08-0.11 seconds

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