ECG basics Flashcards
septal leads face
V1 and V 2
septal leads reciprocal changes seen in
V7, V8, V9
anterior leads
V3, V4
anterior leads reciprocal changes seen in
Nil (may see some in big MI
lateral leads
I, AVL, V5, V6
lateral leads reciprocal Chages in
II, III, AVF
inferior leads
II, III< AVF
inferior reciprocal changes in…
I, AVL
poster leads
v 7-9
posterior recepricol changes
V1, V2
function of the pacemaker cells
These cells have automaticity and create the electrical conduction system of the heart
large box on the ECG represents
200 ms
small box on ECGs represents
40 ms
When the depolarization is moving toward a positive electrode on the ecg, the complexes will be
upright
outline PAILS
Posterior – anterior reciprocal changes
Anterior – inferior reciprocal changes
Inferior – lateral reciprocal changes
Lateral <-> inferior or septal reciprocal changes
Septal – posterior reciprocal changes
normal QRS length
80-100ms
wide QRS is
over 120ms
normal PR length
120-200
elevation considered ST elevation in our guidelines
More than or equal to 2 mm (200 μV) of ST elevation in two or more leads V1-3, or
More than or equal to 1 mm (100 μV) of ST elevation in two or more contiguous leads in any other area.
normal T wave direction on ECG
upright in all leads expect avR and V1
differentials for tall t waves
LBBB, WPW, Hyperkalaemia, MI, pericarditis
normal presentation of T waves in Hyperkalaemia
narrow base and peaked
presentation of T waves in suspected MI
broad base T waves, peaked and reciprocal changes
isolated t wave inversion can be normal in….
AVL, AVR and V1
