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Questions and Answers
What is the mean QRS vector?
What is the mean QRS vector?
- The sum of all smaller vectors of depolarization (correct)
- The general direction and magnitude of the movement of depolarization
- The general direction and magnitude of the movement of repolarization
- The sum of all smaller vectors of repolarization
In which direction does the mean QRS vector normally point in the frontal plane?
In which direction does the mean QRS vector normally point in the frontal plane?
- Downward and to the patient's left (correct)
- Downward and to the patient's right
- Upward and to the patient's left
- Upward and to the patient's right
Why does the mean QRS vector point more left?
Why does the mean QRS vector point more left?
- Due to the thicker RV having larger small vectors of repolarization
- Due to the thicker LV having larger small vectors of depolarization (correct)
- Due to the thicker RV having larger small vectors of depolarization
- Due to the thicker LV having larger small vectors of repolarization
What is the axis direction if the QRS is upright in lead I, negative in lead aVF, and Lead II is downward (negative)?
What is the axis direction if the QRS is upright in lead I, negative in lead aVF, and Lead II is downward (negative)?
What can cause a right axis deviation (RAD) according to the text?
What can cause a right axis deviation (RAD) according to the text?
Which condition does NOT lead to left axis deviation?
Which condition does NOT lead to left axis deviation?
What happens to the mean QRS vector if the heart is displaced?
What happens to the mean QRS vector if the heart is displaced?
In ventricular hypertrophy, how does the mean QRS vector get displaced?
In ventricular hypertrophy, how does the mean QRS vector get displaced?
How is left axis deviation (LAD) defined in terms of degrees?
How is left axis deviation (LAD) defined in terms of degrees?
What method is suggested for determining the QRS axis?
What method is suggested for determining the QRS axis?
Causes of RAD include normal variant and conditions such as right ventricular ________
Causes of RAD include normal variant and conditions such as right ventricular ________
RAD can also be caused by preexcitation syndromes like Wolff-Parkinson-White syndrome and ventricular ________
RAD can also be caused by preexcitation syndromes like Wolff-Parkinson-White syndrome and ventricular ________
Dextrocardia is characterized by the apex of the heart being on the right side of the body, which can lead to ______.
Dextrocardia is characterized by the apex of the heart being on the right side of the body, which can lead to ______.
Limb-lead reversal, right ventricular overload syndromes, and ventricular tachycardia are also potential causes of ______
Limb-lead reversal, right ventricular overload syndromes, and ventricular tachycardia are also potential causes of ______
Another cause of RAD is right ______ enlargement
Another cause of RAD is right ______ enlargement
The P wave on an ECG represents ventricular depolarization.
The P wave on an ECG represents ventricular depolarization.
The QT Interval measures the contraction of the ventricle from the beginning of the Q wave to the end of the T wave.
The QT Interval measures the contraction of the ventricle from the beginning of the Q wave to the end of the T wave.
A mean QRS vector pointing more left indicates right axis deviation (RAD).
A mean QRS vector pointing more left indicates right axis deviation (RAD).
LAD can indicate the presence of Left Anterior Fascicular Block (LAFB).
LAD can indicate the presence of Left Anterior Fascicular Block (LAFB).
Mechanical shift of the heart in the chest due to conditions like lung disease can lead to Right Axis Deviation (RAD).
Mechanical shift of the heart in the chest due to conditions like lung disease can lead to Right Axis Deviation (RAD).
Right Axis Deviation (RAD) can be caused by Ventricular Arrhythmias like atrial fibrillation.
Right Axis Deviation (RAD) can be caused by Ventricular Arrhythmias like atrial fibrillation.
The QT interval should be less than the preceding R-R interval.
The QT interval should be less than the preceding R-R interval.
The J point is the junction at which the S wave meets the ST segment.
The J point is the junction at which the S wave meets the ST segment.
A 12-Lead EKG consists of 6 limb leads and 6 precordial leads.
A 12-Lead EKG consists of 6 limb leads and 6 precordial leads.
The mean QRS axis provides information about the overall electrical activity of the heart.
The mean QRS axis provides information about the overall electrical activity of the heart.
Which condition can cause left anterior fascicular block or LBBB, leading to left axis deviation (LAD)?
Which condition can cause left anterior fascicular block or LBBB, leading to left axis deviation (LAD)?
Which of the following is a potential cause of mechanical shift of the heart in the chest, leading to right axis deviation (RAD)?
Which of the following is a potential cause of mechanical shift of the heart in the chest, leading to right axis deviation (RAD)?
What is the normal duration of a Q wave on an ECG?
What is the normal duration of a Q wave on an ECG?
In which phase of the cardiac cycle does the ST segment occur?
In which phase of the cardiac cycle does the ST segment occur?
How is the QTc interval calculated?
How is the QTc interval calculated?
Which leads are associated with Lateral Wall MI?
Which leads are associated with Lateral Wall MI?
What is a potential EKG finding in Posterior Wall MI?
What is a potential EKG finding in Posterior Wall MI?
During which stage does part of the myocardium become electrically inert?
During which stage does part of the myocardium become electrically inert?
What is the potential consequence of right axis deviation?
What is the potential consequence of right axis deviation?
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