Lecture 8 - Arrhythmias

Question 1

Sinus bradycardia is defined as a HR

Answer 1

Under 60 BPM

Question 2

Heart rate is increased by approximately 10 BPM for every _____ increase in *F of body temperature.

Answer 2

1

Question 3

Explain SNS mediated tachycardia.

Answer 3

Due to blood loss or other shock states, the SNS attempts to maintain perfusion/B.P. by releasing catecholamines, which produce tachycardia

Question 4

Explain the almost constant stroke volume in endogenously mediated sinus tachycardia.

Answer 4

Due to catecholamines, contractility is increased; skeletal muscle pump also increases venous return to the heart

Question 5

Explain the decreased cardiac output in pathologically induced tachycardia.

Answer 5

Decreased blood volume; lack of skeletal muscle pump decreases preload (often, ill people aren’t moving around)

Question 6

Explain physiology of respiratory induced sinus arrhythmia.

Answer 6

The respiratory control centers in the medulla lie next to the cardiac vasomotor centers. With deep inspiration, there is “spillover,” which changes heart rate.

Question 7

Sinus tachycardia is defined as a heart rate greater than _____

Answer 7

100 BPM

Question 8

Rhythm?

Answer 8

Sinus bradycardia

Question 9

Rhythm?

Answer 9

Sinus tachycardia

Question 10

Rhythm?

Answer 10

2*, Type I

Progressive PRI until dropped beat

Question 11

Rhythm?

Answer 11

2* Type II

Multiple dropped beats

Question 12

Rhythm?

Answer 12

3* block

Complete dissociation of SA/AV

Regular P-P interval

Regular R-R interval

No 1:1 P:QRS