QuestionSBA
QuestionChoice
The QRS complex on an ECG represents ventricular depolarization. Broad QRS complexes are usually caused by bundle branch blocks or a complication at the atrioventricular (AV) node.
10004806
a
QRS complex indicates ventricular depolarization
QuestionChoice
A saw-tooth baseline on an ECG with a repetition at 300bpm indicates Atrial Flutter. This is a type of atrial tachycardia, localised to the right atrium.
10004809
d
A saw-tooth baseline on an ECG is indicative of Atrial fibrillation
QuestionChoice
P-waves indicate atrial depolarisation after the action potential generated by the sinoatrial node. If the Bundle of His fibres are blocked, you can observe a heart block.
10004807
b
The P wave indicates the depolarisation of the Bundle of His
QuestionChoice
Vagal nerve stimulation is responsible for the parasympathetic system and thus would decrease heart rate. This results in an increase in PR intervals.
10004810
e
PR interval duration is decreased on vagal stimulation
QuestionChoice
Tall 'tented' T waves occur in hyperkalaemia and may be an early sign of ST elevation in myocardial infarction.

Remember: Hypokalaemia causes ST depression, whereas Hyperkalaemia causes 'tall-tented' T waves! Imagine arrows going down for hypokalaemia and up for hyperkalaemia - this represents which way the T waves will effectively 'stretch'.
10004808
c
Tall T waves on an ECG occur in hypokalaemia
Concept
Chapter
2693
4078
ECG set up
Topic
134
Cardiology
13508
Which of the following options accurately describes findings on an ECG?
a