Measures the electrical activity in the heart by using sensors attached to the skin
This produces a trace
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(P interval) P wave
Shows when atrial depolarisation is happening
Shows the start of atrial contraction in Atrial systole
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QRS Complex
Shows when ventricular depolarisation is happening
Shows the start of ventricular systole
At the same time, atrial depolarisation is happening but is hidden by the QRS complex
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T wave
Shows when ventricular repolarisation is happening
Shows when the heart is relaxing in cardiac diastole
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PR interval
Is the time between the first deflection of the P wave
The first deflection of the QRS complex
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ST interval
The first time between ventricular depolarisation and repolarisation
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Tachycardia
Increased heart rate
Peaks of QRS complex are regular but close together
Typically over 100 bpm
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Bradycardia
Decreased heart rate
Peaks of QRS complex are regular but further apart
Slower than 60 bpm
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Ventricular Fibrillation
No PQRST visible
Ventricles ‘quiver’ - contraction is not controlled/coordinated
Very little blood pumped out of the heart - can lead to cardiac arrest
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Sinus Arrythmia
Irregular heart rate
Peaks of QRS complex not regularly spaced
Linked with breathing - faster when breathing in, slower when breathing out
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Flat line
No PQRST visible as no electrical activity in the heart
Heart not beating
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Other cards in this set
Card 2
Front
Shows when atrial depolarisation is happening
Shows the start of atrial contraction in Atrial systole
Back
(P interval) P wave
Card 3
Front
Shows when ventricular depolarisation is happening
Shows the start of ventricular systole
At the same time, atrial depolarisation is happening but is hidden by the QRS complex
Back
Card 4
Front
Shows when ventricular repolarisation is happening
Shows when the heart is relaxing in cardiac diastole
Back
Card 5
Front
Is the time between the first deflection of the P wave
The first deflection of the QRS complex
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