In Third Degree Heart Block:

[abarnes]

All of the rhythms characterized as heart blocks are caused by conduction disturbances at the:
◦ SA node.
◦ AV node.
◦ Purkinje fibers.
◦ atrial pathways.

[s.meritte]

AV node.

[go.lag]

In Third Degree Heart Block with a rate of 40-60 bpm, with a QRS of less than 0.12 sec, you should suspect that the pacemaker controlling the heart is located in the:
◦ ventricles.
◦ SA node.
◦ AV junction.
◦ atria.

[verrinzo]

AV junction.

[go.lag]

TY

[verrinzo]

You're welcome

[mckennatimberlake]

In First Degree Heart Block, what additional feature must you identify?
◦ QT ratio
◦ Bundle branch block
◦ Pulse deficit
◦ Underlying rhythm

[Joy Chen]

Underlying rhythm

[jayhills49]

The most diagnostic feature of Wenckebach is:
◦ the PRI is consistently regular.
◦ there are always 2 P waves for every QRS complex.
◦ both atrial and ventricular rates are regular.
◦ the PRIs get progressively longer until one is dropped.

[okolip]

the PRIs get progressively longer until one is dropped.