Summary - healthcare science

Fundamentals of ECG

What is the sensitivity value?
AHA spec- 10mm/mv

What is the T wave?
The t wave represents ventricular repolarisation.

What does the Q wave show?
1st negative deflection

What should the T wave look like?
 Less than 10mm
 No bigger than 1/3 of R wave

How long should the p wave last
0.08-0.10s

Intervals in ECG









What is the bundle branches escape rate?
 40-60bpm

What is speed?
25-50mm/s

What should the ST look like?
Bigger than or the same as 1mm above or below the isoelectric line

What is the bipolar lead?
 Record voltage and left ankle

How long should the PRQ interval last?
0.12-0.2

What is the normal axis range?
Anything from -30-+90 degrees

, What does the R wave show?
1st positive deflection


What is the AV node for?
 Responsible for slowing down conduction from atrium to ventricle, allows ventricles to fill
and then contract
 Connects bundle of his to purkinjie

Where is lead II and what does it record?
right arm =(-) terminal, left leg=(+)-> records right upper portion of heart -> tip of ventricles

What does the P wave represent?
 Atrial depolarisation

How long should the QT interval last
 0.42-0.43

What is a baseline drift artefact?