QT Flashcards by Sarah Louise Duffy

what is the QT interval?

depolarisation and repolarisation of the ventricles

How well did you know this?

Not at all

Perfectly

how to measure qt interval

start of QRS to end of t wave

How well did you know this?

Not at all

Perfectly

how to calculate correct QT interval? QTc

QTc = QT / square root of RR

How well did you know this?

Not at all

Perfectly

what causes a prolonged QT interval?

acure myocardial ischaemia
myocarditis
bradycardia
head injury
hypothermia
U&amp;E imbalance (low K+, Ca2+ or Mg)
congenital
drugs (Quninidine, antihistamines, macrolides, amiodarone, pehnothizines)

How well did you know this?

Not at all

Perfectly

normal QT and QTc

normal QT is less than half the preceeding RR interval

prolonged >440 men > 460 women

<350ms is short

How well did you know this?

Not at all

Perfectly

what does a long QT mean

heart takes longer to recharge between beats (repolarise)

How well did you know this?

Not at all

Perfectly

QT Flashcards

(6 cards)