ECG LITFL Flashcards
stemi criteria
) More than or equal to 2 mm of ST elevation in two or more leads V1-3, or
b) More than or equal to 1 mm of ST elevation in two or more contiguous
leads in any other area (V4-6, l, ll, lll, aVL or aVF), or
c) More than or equal to 1 mm of ST elevation in two or more contiguous
posterior leads (V7-9), or
d) Left bundle branch block that is known to be new
leads in inferior STEMI
II, III, AVF
Artery in inferior stemi
right contrary artery
septal leads
V1, V2
sepal Artery
left anterior decending
anterior leads
V3-4
anterior arteries
LAD
lateral leads
I, AVL
lateral artery
circumflex
anteriorlateral leads
V5 V6
anterior lateral arteries
circumflex
name the H’s
hypoxia
hypovolemia
hyperglucemia
hyperkalemia
name the T’s
thrombin
toxin
temponade
tension pnumo
LBBB charecgeristis
wide QRS, dominate S wave in V1, notched R looks like bunny ears in V6
RBBB characteristics
wide QRS, Bunny ears in V 1 and soured S wave in V6
big box time
0.2, 5mm
small box time
0.04
1 big from R to R means
rate 300
2 bosses between R to R means
150bpm
how to caculate rate
bosses between R waves dived by 300 there number of boxes there are.
QRS time
1-3 bosses (0.04-0.12)
PR interval is
PR interval is three to five small squares (0.12-0.20 s)
name the 8 steps of ECG int
rate, rhythm, P wave, PR, QRS, ST, T, Q, QT
leads, reciprocal changes and artery of septal
FACING: V1, V2,
Reciprocal: nil
Artery: LAD
leads, reciprocal changes and artery of anterior
FACING: V 3 and V4
Reciprocal: nil
Artery: LAD
leads, reciprocal changes and artery of lateral
FACING: I, AVL, V5, V6
Reciprocal: II, III, AVF
Artery: LAD/CX
leads, reciprocal changes and artery of antmeriorseptal
FACING: V1-V4,
Reciprocal: nil
Artery: LAD
leads, reciprocal changes of anteriorlateral
FACING: I, AVL, V3-V6
Reciprocal: II, III, AVF
Inferior reciprocal changes in
I, AVL
Posterior where are reciprocal changes
V1-V4
1st degree heart block rule
R far from P 1st degree
2nd degree type 2 characteristics
longer, longer, drop
2nd degree type 2 characteristics
some P’s don’t Get through
3rd degree heart block characteristics
P’s and Q’s don’t agree
one large square time
0.2s
one small square Tim,e
0.04
rule of 300 to calculate HR
300/ R-R int (in large squares)
name the rates of rule of 300
1=300
2=150
3=100
4=75
5=60
how to calculate rate using rhythm strip
HR= no. of QRS x 6
define an ecg’s rhythm,
it is where the action potential started
define a sinus rhythm
- P wave upright in II
- P waver inverted in AVR
- each P looks the same (within the same lead)
what is cardiac axis
average direction of electrical potential during dfepolirasation of the ventricles
what do you look at to determine axis
if the QRS is mostly up (positive) our down (neg) in lead I and AVL
cherectertics of normal axis
I: positive
AVL: postive
LAD cherecteritisics
I: positive
AVL: neg
rad charectereisitics
I: neg
AVL: pos
Extreme axis cherecterisitics
I: neg
AVL: neg
what is the PR interval
atrial depolarisation and contraction
normal duration of PR
0.12-0.2 (3-5 box)
trick to finding PR
if you find one that begins close to the beginning of a big box, and QRS begins before the end of that box, you know it is not prolonged
what is the QRS representing
ventricular depolarisation
QRS should be…
less than 3 small boxes
a wide QRS represents
abnormal ventricular condition, which will affect the shape of the ST segment and T waves
what is the Q wave
the first deflection of the QRS if it is downwards
what dose the Q wave represent
normal L to R depolirsation of the septum
where is the Q wave normally seen
in L sided leads: I, AVL, V5-V6
how long should Q wave be
small box
big Q most often due to
pervious MI
R wave progression in V1 should be
negative
R wave progression in V6 should be
positive
in V what is the relationship between QRS and ST segment
QRS should be larger than ST
what dose the ST segment represent
nop eléctricas activity, thus should be flat
T wave usually inverted in…
V1, AVR
Qt is measured from
Start of the QRS to end of the T
general rule for QT int
QT should be less than half the preceding R-R int
normal QT form men
less than 440ms
normal QT for women
less than 460mms
