Karteikarten
ECG
Karten in diesem Stapel (24)
- 1What is an ECG?Electrocardiogram - a graphical representation of the electrical activity of the heart
- 2What is sinus rhythm?Rhythm arising from the SA node
- 3What causes upward and downward deflections on an ECG?The direction of the current in relation to that electrode. Upwards = current flowing TOWARDS electrode
- 4In which general direction do electrical waves in the heart travel?
- 5How many electrodes does a 12 lead ECG have?10
- 6Where are the limb leads placed?Right arm, Left arm, Right ankle, Left ankle
- 7Which leads derive from the limb leads?Leads I,II,III and aVR, aVL, aVF
- 8What is lead I?Current from RA to LA
- 9What is lead II?Current from RA to LL
- 10What is lead III?Current from LA to LL
- 11What does the 4th limb lead (RL) do then?Acts as the 'ground' to give machine an idea of 0
- 12How is aVR derived?Compares RA to lead III
- 13How is aVL derived?compares LA with lead II
- 14How is aVF derived?compares LL to lead I
- 15How many chest leads are there?6
- 16How are these different to the limb leads?They are unipolar, so they measure current moving towards and away from themselves, not between 2 electrodes.
- 17Where is V1 placed?Right sternal edge, 4th ICS
- 18Where is V2 placed?Left sternal edge, 4th ICS
- 19Where is V3 placed?between V2 and V4
- 20Where is V4 placedAround apex beat, midclavicular line, 5th ICS
- 21Where is V5 placed?horizontal with V4, left anterior axillary line
- 22Where is V6 placed?Mid-axillary line, horizontal with V4+5
- 23How do you calculate the HR from an ECG?Count the number of squares between 2 QRS complexes.
- 24What does each small square (horizontally) represent?40msecs. 1500/no. of small squares = HR