lecture 11 rhythm of the heart Flashcards by Anna Stevens

Q

where does the electrical system start

A

SAN

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Q

what is the SAN influenced by

A

sympathetic and parasympathetic

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Q

after SAN

A

AVN

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Q

what happens at the AVN

A

electrical impulses paused

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Q

after AVN

A

purkinje

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Q

where do you see slow AVN conduction on ECG

A

P-R

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Q

bradycardia

A

less than 60bpm

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Q

tachycardia

A

more than 100 bpm

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Q

parasympathetic affact

A

slows

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Q

sympathetic effect

A

speeds up

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Q

very fit people heart rate

A

high vagal tone
active parasympathetic
low heart rate

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Q

brady cardia, normal QRS distance and P wave

A

sinus bradycardia

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Q

no P wave normal QRS distance bradycardia

A

heart block

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Q

bradycardia, normal QRS, normal P wave, long PR

A

first degree heart blcok

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Q

why might you have first degree heart block

A

old

beta blockers

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Q

non regular QRS, bradycardia, P waves

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A

second degree heart block

Q

more P waves than QRS bradycardia

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A

2:1 heart block

Q

no relationship between QRS and P wave

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A

complete heart block

Q

what happens in complete heart block to the ventricles

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A

contract at their own intrinsic rhythm

Q

why might someone have bradycardia

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A

hypothyroid
young
drugs

Q

someone who is unwell with bradycardia treatment

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A

atropine

Q

what does atropine do

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A

speeds the AVN

Q

BBB usually benign

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A

right BBB

Q

LBBB is a problem with

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A

left vetricle

regular narrow QRS tachycardia

SVT

regular QRS tachycardia

VT

how do you distiguish between SVT and VT

inject ademnosine (blocks AVN)

ventricular fibrillation patient

unconscious | no pulse

why does AVN not always conduct SAN

usually in refractory

Torsades de pointes caused by

class 1 antiarrhythmics

treatment of Torsades de pointes

inject magnesium

what could you try and treat SVT

vagotonic manouvres

vagotonic manouvres

cold water blowing through small tube pressing on the carotid to stimulate the AVN

treatment for VT

amioderone IV | cardioversion

atrial fibrilation and stroke

bad flow in the atria | leeds to clots

treatment for AF

beta blockers | warfarin

atrial flutter treatment

beta blockers | warfarin