junctional rhythms

Question 1

junctional rhythm

Answer 1

rate: 40-60bpm
rythm- regular
P wave: none, antegrade, retrograde
P:QRS ratio: 1:1 or retrograde
PR internal- non, short or retrograde
QRS width- 120ms (0.12 sec)

Question 2

normal rhythms of different areas

Answer 2

SA node (60-100 bpm)
Atria (< 60 bpm)
AV node (40-60 bpm)
Ventricles (20-40 bpm)

Question 3

different junctional rhythms:

Answer 3

Junctional bradycardia = junctional rhythm at a rate of < 40 bpm.
Junctional escape rhythm = junctional rhythm at a rate of 40-60 bpm.
Accelerated junctional rhythm = junctional rhythm at 60-100 bpm.
Junctional tachycardia = junctional rhythm at > 100 bpm.

Question 4

accelerated junctional rhtyhm

Answer 4

rate: 60-100
rythm- regular
P wave: none, antegrade, retrograde
P:QRS ratio: 1:1 or retrograde
PR internal- non, short or retrograde
QRS width- 120ms (0.12 sec)

Question 5

junctional tachcardia

Answer 5

rate: >100bpm
rythm- regular
P wave: none, antegrade, retrograde
P:QRS ratio: 1:1 or retrograde
PR internal- non, short or retrograde
QRS width- 120ms (0.12 sec)

Question 6

supraventricular tachycardia- AVNRT

Answer 6

Regular tachycardia ~140-280 bpm.
QRS complexes usually narrow (< 120 ms) unless pre-existing bundle branch block, accessory pathway, or rate related aberrant conduction.
ST-segment depression may be seen with or without underlying coronary artery disease.
QRS alternans – phasic variation in QRS amplitude associated with AVNRT and AVRT, distinguished from electrical alternans by a normal QRS amplitude.
P waves if visible exhibit retrograde conduction with P-wave inversion in leads II, III, aVF.
P waves may be buried in the QRS complex, visible after the QRS complex, or very rarely visible before the QRS complex.