Sinus Arrhythmias

Question 1

Describe the R-R, P-wave, QRS, and Rate of a Normal Sinus Rhythm?

Answer 1

R-R- regular
QRS- Narrow
P- wave - upright
Rate 60-100 bpm

Question 2

How does a normal sinus rhythm differ from a sinus tachycardia?

Answer 2

Sinus Tachy rate is is above 100 bpm but less than 160 bpm

Question 3

What would be a narrow QRS?

Answer 3

<0.12 secs or 3 boxes

Question 4

How does sinus bradycardia differ from a sinus tachy or NSR?

Answer 4

The rate is less than 60 but greater than 40 bpm

Question 5

What is a common cause of S. Brady.

Answer 5

Acute inferior wall MI the RV is often involved

Question 6

What do you do to tx S. Brady.?

Answer 6

Atropine or pacemaker

Question 7

Describe the R-R, P-wave, QRS, PR interval, and Rate of Sinus Arrhythmia?

Answer 7

R-R- irregular 
QRS- Narrow
P- wave - upright 
Rate <100 bpm 
PR Interval- fixed

Question 8

What happens on inspiration in a sinus arrhythmia?

Answer 8

SA fires faster on inspiration

Question 9

What is a sinus node dysfunction?

Answer 9

SA cant generate sufficient HR

Question 10

What age is sinus dysfunction common in ?

Answer 10

> 70 yrs old

Question 11

What types of meds are common in causing reversible sinus dysfunction?

Answer 11

Beta-blockers
Ca Channel Blockers
Digoxin

Question 12

What is sinus arrest?

Answer 12

Failure of the SA node to fire with a pause that lasts 2 sec to 2 mins

Question 13

How does a sinus arrest differ from a sinus block?

Answer 13

A Sinus block occurs at resumes at its regular interval a sinus arrest resumes at a random interval.

Question 14

What happens to the p-wave in a junctional escape rhythm?

Answer 14

The p-wave is displaced or absent