A
What is the approximate diameter of the coronary arteries?
1/8 inch
What is the normal standard setting for the EKG?
10 mm/mv
What is the difference between agonal and asystole on an EKG?
asystole is a flat line while agonal is less than 20 beats per minute
A characteristic of heart cells where they can start electrical impulses automatically
Automaticity
What is the third stage of the cardiac cycle, when the heart is preparing to work again? (2 names for the same thing)
baseline, polarization
Below which rib is the base of the heart located?
2nd
What is the normal speed for an EKG to run?
25mm/sec
What should you do if a patient becomes unconscious during an EKG?
STOP. Get help.
When the heart rate goes down to 40-60 beats per minute where is the impulse usually generated from?
AV node
Why is the left ventricle the largest chamber in the heart?
because it has the job of pumping out blood to all parts of the body
What does each small square on an EKG represent?
.04 seconds
The normal sinus rhythm has a rate of how many beats per minute?
60-100
Birth of a Heart Attack
1. Plaque builds up.
2. A piece breaks off.
3. The piece travels until it gets to somewhere it cannot get through.
4. Heart attack.
Where does the impulse go after the SA node?
AV node, also called Atrioventricular node
What is the valve between the left atrium and left ventricle?
bicuspid (mitral) valve
When measuring the height of peaks in an EKG what does each large square represent?
5mm x 5mm
When does the U wave appear, if it appears?
after the T wave
What is the specialized conduction tissue found in the right atrium, which is the electrical connection between atria and ventricles?
atrioventricular (AV) node
Tricuspid valve and Mitral/Bicuspid valve
AV Valves
Where does the impulse go after the AV node?
Bundle of His
How many electrodes are in a 12 lead EKG?
10 electrodes
What can ischemia in the heart cause?
angina and infarction
What is another name for leads aVR, aVF, and aVL?
Augmented leads
What is the upper border of the heart, which is broad in shape?
base of the heart
What is represented by the P wave, QRS complex, and T wave?
Cardiac Cycle