ECG extra summary

Question 1

value of each small square

Answer 1

40ms

Question 2

sinus rhythm

Answer 2

p wave before each QRS

Question 3

pathological Q waves indicative of?

Answer 3

PREVIOUS MI

Question 4

how does the QRS normally appear in V1 and V2 (inv/or not?)

Answer 4

QRS downwards
inverted
> normal!!

Question 5

normal range for PR interval?

Answer 5

120-200ms

Question 6

which drugs cause prolonged PR interval?

Answer 6

Ca blockers

and possibly beta.

Question 7

what’s classed as tall R waves?

Answer 7

over 25mm

Question 8

tall R waves seen in?

Answer 8

skinny patients> heart closer to skin

those with left ventricular hypertrophy (also athletes with this)

Question 9

LVH can cause?

Answer 9

left axis deviation

Question 10

left axis deviation due to?

Answer 10

LVH

BUT significant left axis deviation more commonly due to conduction block

Question 11

what’s seen in a fib?

Answer 11

wavy baseline

no regular p waves

Question 12

ST depression indicative of?

Answer 12

ischaemia

Question 13

tall QRS indicative of?

Answer 13

background hypertension

LVH

Question 14

broad QRS indicative of?

Answer 14

impulse origin is from ventricle. e.g. ventricular tachycardia > lack of P waves also seen in V tachy

ventricles take over as pacemaker ‘escape rhythm’

Question 15

what’s the problem with ventricular tachycardia?

Answer 15

can decompensated into ventricular fibrillation