Lecture 2 Flashcards
(12 cards)
Electrodes measure changes in ________.
The reference electrode is always ________.
Polarity
Positive
Depolarizations are ________ when they move towards an electrode.
Depolarizations are ________ when they move away from an electrode.
Repolarization s are _________ when they move towards an electrode.
Depolarizations are _________ when they move away from an electrode.
Positive
Negative
Negative
Positive
Most EKGs you see will be __-lead EKGs
12
A 12-lead EKG has 6 ____ leads and 6 __________ leads arranged along the chest wall.
Limb
Precordial
R-wave progression means that as you move from V1 to V5, the R-wave moves from ________ to more _________. This could indicate the patient is suffering from an _______.
Negative
Positive
Infarct
The vector where most depolarization occurs is known as the ____ __________ ____. Basically, it is the sum of all the QRS vectors.
Mean Electrical Axis
If the Mean Electrical Axis has changed, this indicates that ____________________________?
The heart has changed shape.
To calculate the MEA, you only need to look at two leads, the ________ and ___________.
Lead 1 and aVF
Covers all the ventricles
Lead 1:______. Lead 1:_____
aVF:_________. aVF:________
Indicates: Indicates:
_________________________________________________________________
Lead 1:______. Lead 1:_____
aVF:_________. aVF:________
Indicates: Indicates:
(-). (+)
(-). (-)
Indeterminate. Left Deviation
_________________________________
(-). (+)
(+). (+)
Right Deviation. Normal Axis
Hypertrophy indicates that: ?
Dilation indicates that: ?
Cells get bigger, heart walls get thicker
Chamber gets bigger, Response to volume overload
Atrial problems can be hidden by the ___________
Ventricles (because they’re bigger!)
To determine an Arrythmia, count the number of ______ __________ and divide by ______ to determine the rate.
To determine the rhythm, make sure there is a __:___ ratio of P-waves to QRS waves and that it ‘looks’ regular.
Big squares
300
1:1
