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How many leads are there in an ECG?
12
What does a large Q wave signal?
Dead tissue (old MI)
What is the order of conduction of the electrical impulse through the heart?
SAN->AVN->Bundle of His->Purkinje fibres
How does an ECG work?
-It measures the electrical activity of the heart on the skin
-Currents are detected from the wrist and the ankle
-Works as the heart is a functional syncytium where all the cells effectively function as one and so experience the same electrical changes
What does a misshapen QRS signify?
Abnormal ventricular conduction
What does a wide QRS signal?
An issue with conducting fibres
Iron deficiency causes _______ _______ _______
hypochromic microcytic anaemia
What are the three types of cardiac myocyte cells?
Pacemaker cells (set hearts rhythm)
Conducting cells (send rhythm to whole heart)
Contractile cells (contracts to heart's rhythm)
Why is there a 0.1-0.2s delay in the wave of excitation from the SA node to the AV node?
It means the ventricles contract after the atria allowing them more time to effectively fill
How slowly is electrical potential conducted in the AVN?
0.05 m/s
Where are the 12 standard leads located?
3 bipolar
3 augmented
6 precordial
What is sinus tachycardia?
It is a tachycardia driven by the SAN beating too quickly
Normal PR intervals and each P followed by QRS
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