ECG

Question 1

Describe the waves of electrocardiogram

Answer 1

-Atrial repolarization happens during QRS complex but electrical signals from larger ventricles are dominant

Question 2

Describe the PR interval and segment

Answer 2

Question 3

Describe QRS duration

Answer 3

Question 4

Describe ST segment

Answer 4

Question 5

Describe QT interval

Answer 5

Question 6

Explain the effects of Hyperkalemia on the QRS complex

Answer 6

-Opening of the inactivation gates will normally follow by the closing of the activation gates when the membrane potential is returning to its resting state
-Hyperkalemia can cause partial depolarization (increase in equilibrium potential -less negative), some of the activation gates fail to reset themselves and are still in their opening position, allowing some Na+ influx and giving rise to wide QRS complex

Question 7

Describe the indication of acute myocardial ischemia in the isoelectric (ST) segment

Answer 7

Question 8

Describe the T wave

Answer 8