ECG

Question 1

Rate

Answer 1

Normal rate is 60-100. Less than 60 is called bradycardia and more than 100 is called tachycardia.

Question 2

PR interval

Answer 2

A normal PR interval is between 0.12 and 0.2 seconds. A PR interval consistently longer than 0.2s is referred to as first degree heart block

Question 3

ST segment

Answer 3

An upsloping ST segment (referred to as ST elevation) is indicative of a myocardial infarction. A depressed ST segment suggests myocardial ischaemia.

Question 4

QTc interval

Answer 4

The normal range for the QTc interval is 0.35-0.45 seconds.

Question 5

T waves

Answer 5

Are peaked in hyperkalemia, flat and prolonged in hypokalemia, and inverted in normal in some leads and also in ischemia and infarction.

Question 6

U waves

Answer 6

Can be normal but also can be found in hypokalaemia

Question 7

Tachycardia

Answer 7

Associated medicationClozapine
TCAs
MAOIs
Antiparkinsonian
Antipsychotics (generally the older ones)

Question 8

Bradycardia

Answer 8

Associated medicationSSRIs
Lithium
Cholinesterase inhibitors

Question 9

Heart blocks

Answer 9

Associated medicationTCAs

Question 10

ECG findingRepolarisation changes (ST segment & T wave changes)

Answer 10

Associated medicationThioridazine

Chlorpromazine

Question 11

ECG findingTorsades/VF

Answer 11

Associated medicationHaloperidol
Thioridazine
Mesoridazine
Chlorpromazine