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1

Electrocardiograms

Measuring heart voltage

Picture credit: Shutterstock

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2

Electrocardiograms

Blood flow

ECG

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3

Electrocardiograms

Atria

P

ECG

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4

Electrocardiograms

Ventricles

R

P Q S

ECG

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Electrocardiograms

ECG trace

P Q

T

S

Another beat

R

ECG

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6

Electrocardiograms

frequency = 1 ÷ period

Heart rate

time

v

o

lt

a

g

e

period