ECG 5 - Heart Block

Question 1

First degree
-PR interval over ? ss
-each wave of ? depol is spread to ventricles, but there is a delay somewhere
-not in itself pathological - can indicate.....
=? ? disease
=acute ? ?
=? disturbances
=? toxicity

Answer 1

5
SAN
cor aa
rheum fever
E-
digoxin

Question 2

Second degree

• excitation ? fails to pass through AVN or bundle of his
• often indicates ? heart disease
• mobitz and wenckebach - what trt?
• what may be an indication for pacing?
• 3 types?

Answer 2

intermittently
underlying
no spec trt
2:1/3:1/4:1 block 
mobitz 1 - wenk
mobitz 2
2:1/3:1 etc conduction

Question 3

Second degree
mobitz 1 = ? phenomenon - ? PR lengthening until an ? beat is not ? - this cycle repeats
Mobitz 2 = ? PR interval, sometimes an atrial contraction without ? contraction
2:1/3:1 etc conduction = twice/three times etc as many ? waves as there are QRS complexes

Answer 3

wenk
progressive
atrial
conducted

constant
ventricular
p

Question 4

Complete/3rd degree
? contraction normal but no beats are conducted to ventricles
? waves are ? from the QRS complexes
ventricles are excited by a ‘? ? mechanism’ - from a depolarising focus ? the ventricles giving a ? QRS
can occur acutely following ?, or be ? state
–chronic state indicates ? tissue disease
–? often needed

Answer 4

atrial
p
disassociated
slow escape
within
wide
mi
chronic
conducting
pacing