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14 Cards in this Set

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  • Back
Define Peaked P waves
tall, symmetrically peaked waves seen with increased right atrial pressure and right atrial dilation. Abnormally tall P waves also seen in sinus tach
Define Notched P waves
P waves with a notched appearance may be seen in increased left atrial pressure and left atrial dilation (P mitrale) May also be wide, or wide and notched.
Define Biphasic P waves:
characterized by an initial positive deflection followed by a negative deflection (reflecting right, then left, atrial depolarization). Occur with both right and left atrial dilation.
Define Saw-toothed wave forms:
“F waves” that represent atrial contraction in atrial flutter (rate 250-350) appear as a saw-toothed pattern (normal P waves are absent).
Define Aberrant conduction:
brief failure of the right or left bundle branch to normally conduct an electrical impulse.
Define Flutter waves:
fluttery-looking P waves resulting from very fast atrial rate. In A-fib, results in chaotic-looking baseline.
Define Ventricular preexcitation:
premature depolarization of the ventricles that occurs when an impulse arises from a site above the ventricles but travels through abnormal accessory conduction pathways to ventricles. Bypasses AV junction/bundles His, allowing ventricles to depolarize early
Define Delta wave:
The slurring/notching seen at the onset of QRS
Define Torsades de pointes:
Ventricular tachycardia arises from one+ focus of irritability. polymorphic tach in which shape of ventricular waveforms change
Review and be able to implement the Five-Step Process of EKG analysis:
Determine rate. Determine regularity. Assess P waves. Assess QRS complexes. Assess PR intervals
Be able to recognize the characteristics of normal and abnormal P waves in terms of:
1. Location:
2. Amplitude:
3. Duration:
4. Morphology:
1. precedes each QRS
2. 0.5-2.5 mm
3. 0.06 to 0.10 seconds
4. usually rounded and upright (or inverted or biphasic in certain leads)
Be able to recognize the characteristics of normal and abnormal QRS complexes in terms of:
1. Location:
2. Amplitude:
3. Duration:
4. Morphology:
1. follows the PR interval
2. 5 to 30 mm (differs according to lead)
3. 0.06 to 0.12 seconds from beginning of the Q wave to end of S wave
4. includes Q, R and S wave
Be able to recognize the characteristics of normal and abnormal PR intervals in terms of:
1. Location:
2. Duration:
3. Morphology:
1. Starts at the beginning of the P wave and ends at the beginning of the Q wave (or R wave is Q is absent)
2. 0.12 to 0.20 seconds
3. P wave and a flat line
EKG II
EKG II