Podcast
Questions and Answers
What is the normal duration of a PR interval in seconds?
What is the normal duration of a PR interval in seconds?
How many small boxes are equivalent to 1 second on the rhythm strip?
How many small boxes are equivalent to 1 second on the rhythm strip?
What is the normal heart rate in beats per minute?
What is the normal heart rate in beats per minute?
What is the purpose of the calibration signal on an ECG?
What is the purpose of the calibration signal on an ECG?
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What is the significance of a negative S wave in a Precordial Lead?
What is the significance of a negative S wave in a Precordial Lead?
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What is the normal duration of a QRS complex in seconds?
What is the normal duration of a QRS complex in seconds?
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What is the purpose of assessing the rhythm in an ECG?
What is the purpose of assessing the rhythm in an ECG?
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What is the significance of a positive R wave in a Precordial Lead?
What is the significance of a positive R wave in a Precordial Lead?
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The heart rate is considered normal if it is between _______ and _______ beats per minute.
The heart rate is considered normal if it is between _______ and _______ beats per minute.
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A small square on the rhythm strip is equal to _______ seconds.
A small square on the rhythm strip is equal to _______ seconds.
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The PR interval should be between _______ and _______ seconds.
The PR interval should be between _______ and _______ seconds.
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The QRS duration should be between _______ and _______ seconds.
The QRS duration should be between _______ and _______ seconds.
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A large square on the rhythm strip is equal to _______ seconds.
A large square on the rhythm strip is equal to _______ seconds.
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The calibration signal on an ECG is equal to _______ millivolts.
The calibration signal on an ECG is equal to _______ millivolts.
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The average amplitude of QRS should be around the size of the _______ signal.
The average amplitude of QRS should be around the size of the _______ signal.
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The paper speed of the ECG is _______ millimeters per second.
The paper speed of the ECG is _______ millimeters per second.
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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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Description
Assess the rhythm strip in Lead II by identifying the PR interval, QRS interval, and calculating the time using the provided scale.
