ECG 3 - Heart Rate and Conduction Intervals

Question 1

PR interval

• from ? or P wave to ? of QRS
• is the time taken for excitation to spread from the ? to the ? muscle - mostly made up of ? delay
• if over ? ss it may be heart ?

Answer 1

start
start
SAN
vent
AVN
3
block

Question 2

ST segment

• from ? of S wave to ? of T wave
• changes may show myocardial ?
• St elevation - must be > ? mm in a chest lead, >1 mm in a ? lead, and on ? leads to be significant

Answer 2

end 
beginning
ischaemia
2
limb
two

Question 3

QT interval
- from ? of q to the ? of t wave
varies with ? ? but can be prolonged by ?/? abnorms
-a ? qt can lead to ventricular ?

Answer 3

start
end
heart rate
drugs
electrolyte
prolonged
tachy