ECG

Question 1

Normal rhythms for canines (2)

Answer 1

Sinus rhythm and sinus arrhythmia

Question 2

Canine sinus arrhythmia on inspiration

Answer 2

increased heart rate form decreased parasympathetic input

Question 3

Wandering pace maker

Answer 3

Pace making activity in other parts of the atria than the SA node

Question 4

Normal feline rhythms (2)

Answer 4

Sinus rhythm and sinus tachycardia

Question 5

Sinus definition

Answer 5

Originating from the SA node

Question 6

Dog and cat heartrates during sinus bradycardia

Answer 6

dog: <60bpm
cat: <150bpm

Question 7

Causes of sinus bradycardia

Answer 7

1. Heart disease
2. Endocrine disease
3. Hypothermia
4. Drugs
5. Increased vagal tone

Question 8

Vagal tone significance
(increased vagal tone= decreased hr)

Answer 8

Part of the autonomic nervous system, specifically the parasympathetic nervous system, that affects many of the body’s organs

Question 8

Atrial standstill

Answer 8

Reduced to no p waves

Question 9

Three causes of atrial standstill

Answer 9

1. Hyperkalemia >8.0 mEq/l
2. Urinary obstruction
3. Hypoadrenocorticism