of a segment indicates whether an impulse is following its normal pathway. An ov
ID: 3513593 • Letter: O
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of a segment indicates whether an impulse is following its normal pathway. An overly long aent reveals that an impulse has been slowed or has taken a longer route. A short segment reflects an impulse that has followed a shorter route If a complex is absent, the electrical impulse did not rise normally, or was blocked at that part of the heart Lack of normal depolarization of the atria leads to an absent P wave. An absent QRS complex afler a normal P wave indicates the electrical impulse was blocked (third degree heart block) before it reached the ventricles. Abnormally shaped complexes result from abnormal spread of the impulse through the muscle tissue, such as in myocardial infarction where the impulse cannot follow its normal pathway because of tissue death or injury. Electrical patterns may also be changed by metabolic abnormalitics and by various medicines. Interpretation of ECGs takes a lot of practice. If you want to review normal and abnormal ECGs, look at the various websites available. One in particular is: 7. Evaluate the following ECGs, then answer the questions. L. Atrial fibrillation II. Complete (or 3"d degree) heart block a) In the atrial fibrillation ECG, which wave is missing? b) Fibrillation indicates a condition where the electrical signals flow randomly in all directions throughout a cardiac tissue (usually either the atria or ventricle). In atrial fibrillation, the this reduces the efficiency of the heart. Which of the following statements best explains the atrial fibrillation ECG? atria do not contract normally and a. b. c. AV node is not relaying electrical signals Purkinje fibers are damaged. SA node is not generating timely electrical impulses. c) What is the abnormality in the 3"d degree heart block ECG? a. AV node is not picking up electrical signal from atria; A V node becomes pacemaker for ventricles b. AV node is not relaying electrical signals. c. SA node is not generating timely electrical impulses d) Based on this ECG, what is third degree heart block?Explanation / Answer
Ans a.....P wave
In atrial fibrillation there is asynchroniseda atrial depolarisation at the rate of more than 350 per minute
Ecg shows....f waves,iregular heart rate with no P wave
Ans b....the best among these three options.SA node is not generating timely electrical impulses.
Ans c..In third degree block ECG ....these is wide QRS wave and QRS is independent of P
In complete. Heart block there is complete failure of conduction from atria to ventricles.ventrickes depolarise from pacemaker which is below bundle of HIS.this generteg a idioventricular rhythm.
Ans d...AV node is not relaying electrical signals so pacemaker now becomes tht ventricle below bundle of HIS.
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