Sinus Rhythms

Sinus Rhythms

Originating in the Sinus Node

Multiple Choice

If the sinus node losses control, what node will pick up?

• AV node

• Bundle of His

• Purkinje Fibers

Open Ended

List a few signs of low cardiac output.

Multiple Choice

Normal Sinus Rhythm (NSR) is the standard in which all other rhythms are compared.

• True

• False

Open Ended

How do we treat asymptomatic Sinus Bradycardia?

Multiple Choice

Tachycardia is when the heart rate is

• less than 100

• greater than 100

• is equal to 100

Open Ended

How do we treat tachycardia?

Multiple Choice

Sinus Arrhythmia rate changes with what?

• respiration pattern

• activity

• rest

Multiple Choice

Treatment is usually note required.

• True

• False

Sinus Arrest

One or more P-QRS-T sequences will be missing. An escape beat from a lower pacemaker may then take over for one or more beats. The sinus node may resume functioning after missing one or more beats, or the lower pacemaker may continue as the pacemaker, creating a new escape rhythm. 

Sinus Block

In other words the beat that the sinus node propagated is not conducted anywhere. This results in one or more P-QRS-T sequences being missing, creating a pause, the length of which will depend on how many sinus beats are blocked. When the conduction of the regularly firing sinus impulses resumes, the sinus beats return on time at the end of the pause. The pause will be a multiple of the previous R-R intervals ( exactly 2 or more R-R cycles will fit into the pause.