Tachycardia

Question 1

Causes of regular, narrow QRS tachycardia

Answer 1

Sinus tachycardia
Atrial flutter with 2:1 block
AV nodal re-entrant tachycardia
Atrioventricular re-entrant tachycardia
Atrial tachycardia

Question 2

Causes or irregualr narrow QRS tachycardia

Answer 2

A fib
A flutter
Multifocal atrial tachycardia

Question 3

Causes of regular, broad QRS tachycardia

Answer 3

VT
SVT with aberrant conduction
Antidromic AV re-entrant tachycardias

Question 4

Causes of irregular broad QRS tachycardia

Answer 4

Torsades

Pre-excited AF

Question 5

Sinus Tachycardia

Answer 5

From SAN
P wave before QRS, + in II and - in aVR
Consistent PR

Question 6

Atrial tachycardia

Answer 6

abnormal P wave shape

isoelectric baseline between P waves

Question 7

Multifocal atrial tachycardia

Answer 7

at least 3 different P waves

irregular

Question 8

Atrioventricular re-entrant tacycardia

Answer 8

Accessory pathway outside the AVN e.g. WPW
orthodromic and antidromic
orthodromic- P waves after QRS
antidromic- broad QRS
subtle P waves- seen as a distortion of ST or T

Question 9

Atrioventricular nodal re-entrant tachycardia

Answer 9

Re-entry confined to tissue proximal to AVN

P waves may not be visible or occur shortly after QRS

Question 10

VT

Answer 10

AV dissociation
no P waves
capture beats- independant narrow QRS
Precordial concordance in V1-V6 (all directed in same direction)
LAD
Usually underlying heart disease
> 30s is sustained

Question 11

SVT with aberrant conduction

Answer 11

No P waves

Broad QRS + LBBB or RBBB