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Flashcards in Electrophysiology Deck (131)
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121

What are the causes of undersensing of a pacemaker?

1. Insensitive lead
2. Lead displacement
3. Insulation failure
4. Lead fracture

122

What are the general sensing cut offs for the p and r waves?

2mV
5mV

123

What proportion of patients with unpaced sick sinus syndrome will develop systemic thromboembolism?

15%

124

What is the benefit of atrial based pacing (AAI or DDD) compared to VVI alone?

Reduction in stroke and AF

125

What are the causes of compromising bradycardia?

Drugs
Ischaemia
Intoxication
Electrolyte disturbance

126

What is a normal HV interval?

40-60

127

What are the long RP interval SVT?

Atrial tachy
AVRT
Atypical AVNRT

128

What are the short RP interval SVT?

Typical AVNRT
AVRT delta pathway
Atrial tachycardia

129

What is a normal SNRT?

<1500msec

130

What is the formula for CSNRT?

SNRT-BCL

131

What is a normal CSNRT?

<525msec