ECG 2023 Exam Questions with Correct Answers

ECG 2023 Exam Questions with Correct Answers What is sinus rhythm? - Answer-Normal heart rhythm, with the electrical activation beginning in the SA node Which part of the ECG corresponds to the contraction of the atria? - Answer-P wave Which part of the ECG corresponds to the depolarisation of the ventricles? - Answer- The QRS complex On the ECG what does the T wave correspond to? - Answer-Re-polarisation of the ventricles On an ECG what is a U wave? - Answer-An extra wave seen on the end of a T wave On an ECG, what does the U wave represent? - Answer-Re-polarisation of the papillary muscles On an ECG what does a large square represent? - Answer-200ms or 0.2s On an ECG what does a small square represent? - Answer-0.04s or 40ms If each large square represents 200m/s how many large squares in 1s? - Answer-5 How many large squares are there per minute? - Answer-300 How do you calculate the heart rate from an ECG? - Answer-R-R interval e.g. RR Interval 4 squares 1 beat per 0.8 seconds 60/0.8 = 75 beats per min