16 Questions
What is the normal duration of a PR interval in seconds?
0.12-0.2s
How many small boxes are equivalent to 1 second on the rhythm strip?
5
What is the normal heart rate in beats per minute?
60-100bpm
What is the purpose of the calibration signal on an ECG?
To measure the amplitude of the QRS complex
What is the significance of a negative S wave in a Precordial Lead?
It is a feature of RV leads
What is the normal duration of a QRS complex in seconds?
0.08-0.11s
What is the purpose of assessing the rhythm in an ECG?
To determine if the heart rhythm is normal or abnormal
What is the significance of a positive R wave in a Precordial Lead?
It is a feature of LV leads
The heart rate is considered normal if it is between _______ and _______ beats per minute.
60-100
A small square on the rhythm strip is equal to _______ seconds.
0.04
The PR interval should be between _______ and _______ seconds.
0.12-0.2
The QRS duration should be between _______ and _______ seconds.
0.08-0.11
A large square on the rhythm strip is equal to _______ seconds.
0.2
The calibration signal on an ECG is equal to _______ millivolts.
1
The average amplitude of QRS should be around the size of the _______ signal.
calibration
The paper speed of the ECG is _______ millimeters per second.
25
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
Assess the rhythm strip in Lead II by identifying the PR interval, QRS interval, and calculating the time using the provided scale.
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