ECG quiz Flashcards
Draw what an ECG looks like for two heart beats (label one of them)
What electrical event causes the P wave?
depolarization of the atria
what electrical event causes the QRS complex?
ventricular depolarization
(hidden is the atrial repolarization)
what electrical event causes the T wave?
ventricular repolarization
what part of the cardiac cycle does the P wave occur in?
in late diastole
what part of the cardiac cycle does the QRS complex occur in?
during systole
what part of the cardiac cycle does the T wave occur in?
early diastole
what is the bundle of pacemaker cells that initiates P wave?
SA node
what is the bundle of pacemaker cells that initiates QRS complex?
AV node
what is the PR segment?
flat line between P and QRS complex;
time delay between atrial and ventricular contraction
what is the PR interval?
P wave + PR segment
total time of atrial contraction
what is the ST segment?
flatline between QRS complex and T wave
ventricles are contracting
what is the QT interval?
ST segment + QRS complex
total time of systole
what is the TP segment?
end of T wave -> beginning of next P wave
what does an elevated ST segment indicative of?
myocardial infarction
which segment/interval shortens the most with exercise?
TP segment
what were the three varied conditions we tested?
1.) lay down for 20 seconds
2.) sit up for 20 seconds
3.) exercise for 60 seconds
what is the equation for BPM?
If a person’s SA node is deformed/malfunctioning, what might happen?
P wave may be nonexistent
If QRS complex is missing, what might this indicate?
second degree heart block
If QRS complex is delayed, what might this indicate?
first degree heart block
what is an inverted T wave indicative of?
ischemia
what does ECG stand for?
electrocardiogram
describe the relationship between delta T and BPM
delt T is indirectly proportional to the value of BPM.
BPM goes up as delta T goes down
what does the ECG measure?
the electrical activity of the heart
