* not completed

. Which of the following statements about the ECG are true?

The P wave of the ECG reflects atrial contraction correct incorrect

The P-Q interval is normally about 0.1 s. correct incorrect

The QRS complex reflects the start of ventricular depolarization. correct incorrect

The peak amplitude of the R wave recorded by the limb leads is about 10 mV. correct incorrect

The T-wave reflects the repolarization of the ventricular fibres. correct incorrect

* not completed

. Which of the following statements regarding arrhythmias are correct?

First degree heart block gives rise to an abnormally long PR interval. correct incorrect

Third degree heart block is indicated by an abnormally long QRS complex following the P wave correct incorrect

An ECG with a sawtooth pattern on the baseline indicates atrial fibrillation. correct incorrect

In second degree heart block some P waves are not followed by a QRS complex. correct incorrect

* not completed

. Which of the following statements about the ECG are true?

The Q-T interval varies with heart rate correct incorrect

In hyperkalaemia the T wave is flattened. correct incorrect

The U wave is more often seen when the heart rate is low. correct incorrect

A long QT interval is characteristic of hypocalcaemia. correct incorrect

* not completed

. Left axis deviation occurs in left ventricular hypertrophy

True correct incorrect

False correct incorrect

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. Left ventricular hypertrophy is present when the R wave seen in one of the left chest leads (V4-V6) is abnormally large (>2.7 mV) and the S wave seen in one of the right chest leads exceeds 3 mV.

True correct incorrect

False correct incorrect