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EKG Midterm
EKG Midterm Review
Question | Answer |
---|---|
RMP | -80 to - 90 |
TMP | -60 to -70 |
AMP | +30 to +40 |
SA Node | 60-100 |
AV Node | 40-60 |
BB<HIS<PURK | 20-40 |
Depolarization | Inside of cell goes from neg. to positive (muscle contraction follows) |
Repolarization | Inside of cell goes from positive to neg. (muscle relaxation follows) |
Automaticity | Ability to initiate impulse (Pacemaker cells) |
Excitability | The ability to respond to the impulse (pacemaker or muscle cells) |
Conductivity | The ability to propagate impulse. (pacemaker or muscle cells) |
Contractility | To shorten and contract. Can only be done by muscle cells. |
All or Nothing Principle | Any electrical activity less than positive 30 Mv will not cause a mechanical contraction. |
Number One law | Electrical precedes Mechanical. |
Number Two Law | Whenever a charge is in motion, a current is produced.; |
V1 | Fourth Intercostal space at the right margin of the sternal border. |
V2 | Fourth Intercostal space at the Left margin of the sternal border. |
V3 | Midway between position V2 and V4on bone. |
V4 | Fifth intercostal space at the left midclavical line (middle of collarbone) |
V5 | At level of position of V4 but on the anterior axillary line (Fifth intercostal space) |
V6 | At level of position of V4 but on the midaxillary line. (Middle of armpit). |
What is the name of the sac around the heart? | Pericardium |
What is the point at which the heart is most tilted to the left? | Apex |
What is connected to the AV valves? | Chordae tendinae |
What describes the ability of the heart to initiate its own electrical impulse? | Automaticity |
What has the thickest wall and is described as the main pump of the heart? | Left Ventricle |
What is seen leaving the cell during Repolarization? | NA+ |
Whenever a charge is in motion what is produced? | a current |
What structure is made of myocardial tissue and separates the right and left sides of the heart? | Septum |
What structure controls the movement and position of the AV valves of the heart? | Papillary Muscles |
What causes Ventricular Contraction? | Ventricular Depolarization |
What causes Atrial Contractions? | Atrial Depolarization |
The inner lining of the heart is termed? | Endocardium |
What activities causes Excitability? | Cardiac Muscle cells and Pacemaker Cells |
What is another term for Contraction? | Systole |
What structures carries Oxygenated Blood to the body? | Aorta |
What structure carries Deoxygenated Blood to the Heart? | Vena Cava |
depolarization of the atria | P wave |
AV delay | PR segment |
combined atrial depolarization and AV delay | PR Interval |
depolarization of Ventricles | QRS Complex |
ventricular Contraction | ST Wave |
Repolarization of Ventricles | T Wave |
When doing a standardization ECG should measure what? | 10 mm or 1 mV |
Waveform of PR Interval | begining of P wave to start of R wave |
Waveform of QRS Complex | Start of Q to end of S wave |
Waveform of ST segment | End of S to beginning of T wave |
Waveform of QT Interval | Start of Q wave to end of T wave |
when 2 or more limbs are use to form a neutral negative point this is called what? | Unipolar |
Unipolar Limb leads | aVR, aVL, aVF |
Bipolar Limb leads | I, II, III |
Which lead is usually used for continuous monitoring of the heart? | Lead II |
Lead I measures current flow between? | RA and LA |
Lead II measures current flow between | RA and LL |
Lead III measures current flow between | LA and LL |
current moving toward a positive electrode records what | an Upward deflection |
Current moving away from a positive or toward a negative records what kind of deflection? | downward |
Two principles stylus works on | Temperature and pressure |
ECG machine operates on ? | 110 volt , 60 cycle outlet |
What do we set the standard setting know at unless otherwise specified? | 10mm/1mV |
If you receive a wandering baseline during chest leads how may you correct this? | Check electrode placement, or ask patient to hold their breath |
What causes a indistinct baseline? | Problem with stylus or printer |
AC interference occurs on which end? | Machine |
If muscle tremor is recorded on Leads I and II, what lead would be the probable cause? | LA |
Abbreviation of electrocardiogram? | ECG/EKG |
The Electrocardiograph records what? | Electrical potential |
A grounded plug is recognized by how many prongs? | 3 |
In AVR, if the RA lead was placed on LA, or RA lead on LL, what would result? | An upward spike on EKG in AVR.. AVR should always have a negative deflection |
What supplies the cardiac musculature with oxygenated blood? | Coronary Arteries |
Where do these structures originate from? | Aorta |
Systole means? | contraction |
Diastole means | Relaxation |
The 3 layers of the heart? | Endocardium, Myocardium, Epicardium. |
Structure is sometimes referred to as the dividing wall, It separates the right and left sides of the heart | Septum |
This chamber of the heart has the thickest myocardial wall and is described as the major pump of the heart | Left Ventricle |
The heart is divided into chambers, the upper are called? | Atria |
The lower chambers of the heart are called what? | Ventricles |
The function of the heart is mainly? | To pump blood to and from body |
These structures control movement of the AV valves | Papillary muscles/ Chordae Tendinae |
Mechanical contraction of the ventricles is a direct effect of what? | Ventricular Depolarization |
QRS Complex | .06-.12 seconds |
QT Interval | .32-.44 seconds |
PR Interval | .12-.20 seconds |
How to determine heart Rate? | Number of small boxes from R to R (3) divided into 1500 |
Time measurement, One small square is equivilant to what? | .04 seconds |
Voltage measurement, 1 small square is equal to? | 1mm |
Apex | Tilt |
Blood Flow | VC-RA-TV-RV-PV-PA-LUNGS-PV-LA-MV-LV-AV-AO-BODY |
Areas of Automaticity | SA Node, AV Node, Bundle of His, R bundle Branch, L Bundle Branch, Perkinji Fibers |
Areas that do NOT use Automaticity? | AV Node, Bundle of His, R Bundle Branch, L Bundle Branch, Perkinji Fibers |
What structures have Excitability? | Pacemaker and muscle cells |
If SA Node has permeability change of 60-100 times a minute, what will the heart rate be? | Normal 60-100 bpm |
Function of Patient Cable? | carries current from patient to machine |
Function of Electrodes? | from patient to pt. cable. |
Right side function of Heart | Receives from body/vena cava sends to Lungs |
Left side function of heart? | Receives from Lungs sends to Body |