01 Chos the h Mark) best answer: (15 Marks) 1. The P wave is the first positive
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01 Chos the h Mark) best answer: (15 Marks) 1. The P wave is the first positive deflection and represents A. Atrial repolarization. B. Atrial depolarization. C. Ventricular depolarization. D. Ventricular repolarization. Which of the following is used to identify the rate and regularity of ventricular 2. contractions? A. PR interval. B. T wave. C. QRS Complex. D. P wave. The nurse interprets this ECG strip as a: 3. A. Normal sinus rhythm. B. Sinus tachycardia. C. Sinus bradycardia. D. Asystole The nurse interprets this ECG strip as a: 4. A. Ventricular tachycardia. B. Ventricular fibrillation. C. Asystole D. Pulseless electrical activity 5. The physiologic pacemaker of the heart has natural power generator that tell the heart to pump is called: A. SA Node. B. AV Node. C. Bundle of HIS. D. Purkinje fibers.Explanation / Answer
1)ARTRIAL DEPOLARISATION-
its morphology is smooth contour and monophsic in lead2.
Artrial depolarisation proceeds from right to left,with right atrium activated before the left atrium.The right and left aatrium summate to form P wave.
The first 1/3 of wave-right atrial activation
final 1/3 of wave-left atrial activation
middle 1/3 rd of wave-combination of right and left.
2)QRS complex indicates ventricular contraction.
ventricular depolarization triggers the contraction of ventricles.because of larger tissue mass,QRS wave is larger than P wave.
ranges from 0.08-0.10 seconds.
3)NORMAL SINUS RHYTHM
Normal ECG shows normal sinus rhythm which indicates the individual is healthy.It has lot of little bumps ,each bump relays an important action in heart which comprises of P WAVE,QRS COMPLEX,T WAVE.
4)VENTRICULAR FIBRILLATION-
The ventricles contrract at very high speed approximating 500 beats per minute
the high speed contraction results in rapid and irregular activity in ventricles leads to failure of synchrony in ventricles and leads to collapse of circulatory system.it is a type of cridac arrhthymia.
5)SA NODE
It is a natural pacemaker of heart situated in upper part of right atrium.it is called as sinus node.
it fires at 60-100 beats per minute.its dysfunction leads to slow heart rhythm called bradycardia.
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