Anatomy of the heart and EKG interpretation Flashcards
(33 cards)
Bundle branches
Split electrical impulse down the right and left side
Purkinje fibers
Electrical pathway for each cardiac cell
Impulse activates ventricles simultaneously
Produce an electrical wave
P wave
First positive deflection Occurs when atria depolarize
atrial contraction
Q wave
- Represent conduction of impulse down the inter ventricular septum
- First negative deflection before R wave
- Not always visualized on the ECG
R wave
- First positive wave of the QRS complex
- Rep. Conduction of electrical impulse to the left ventricle
S wave
First negative deflection after R wave
QRS complex
Complete ventricle depolarization
atrial repolarization occurs (not seen)
0.06 - 0.1 seconds
ST segment
End of the S wave to the beginning of T wave
Myocardial damage
Elevated ST segment
Isoelectric line
Baseline
Ischemia
Reduced oxygen to the heart
T wave
Ventricular repolarization Positive
U wave
Not on all EKGs
PR interval
measured beginning of P wave (atrial depol) to beginning of QRS (ventr. depol)
.12-.20 seconds
how long it takes the ventricles to contract
QT interval
Time required for ventricular depolarization and repolarization
starts at the beginning of QRS complex and ends at the end of T
J point
Indicator of where the ST-Segment begins
End of QRS complex
1 square on the paper is equilvelent to ______ seconds
.04mm or (40 ms)
Calculating heart rate
- 6-second method
- 300 method
- 1500 method
6-second method
best for irregular
not as accurate
300 method
300, 150, 100, 75, 60, 50, 43. 37, 33
Describe the 1500 method.
- Count the number of small boxes between two R
- divide 1500 by that number
What is Sinus Bradycardia?
Where does it originate from?
Originating from the SA node with a heart rate of less than 60 BPM.
This rate may or not affect cardiac output.
What is sinus tachycardia?
Where does it originate from?
Sinus tachycardia originates from the SA node with a heart rate above 100 BPM.
Define
Informed consent
A process for getting permission before conducting a healthcare intervention on a person, or for disclosing personal information.
