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EKG Final 9/6
Question | Answer |
---|---|
What are the structures that control movement of the AV valves? | papillary muscles |
What is the structure that is sometimes referred to as the dividing wall and separates the right and left side of the heart? | septum |
What chamber of the hear has the thickest myocardial wall and is described as the major pump of the heart? | left ventricle |
What are the upper chambers of the heart called? | Atria |
What are the lower chambers of the heart called? | Ventricles |
What is the function of the heart? | to pump blood to the body |
The right side of the heart receives blood from? and sends blood to? | From body, to lungs |
The left side of the heart receives blood from? and sends blood to? | from lungs to body |
What is the blood flow through the heart? | SVC/IVC-RA-TV-RV-PV-PA-LUNGS-PV-LA-MV-LV-AV-AO-BODY |
What is the direct effect of ventricular depolarization? | Mechanical contraction of the ventricles |
What is the resting membrane potential? | -80/-90 mv |
What is the action potential? | +30/+40 mv |
What are the areas of automaticity? | SA node, Internodal fibers, AV node, Bundle of His, Bundle branches and Purkinje fibers |
What areas do not normally use automaticity? | Everything but the SA node |
What structures have excitability? | Pacemaker and muscle cells |
What is the All or None principle? | The heart muscle will not respond to an action potential less than 30 |
The ability of the myocardium to initiate its own electrical impulse is? | automaticity |
The ability of the myocardium to respond to electrical impulses is? | Excitability |
What is conductivity? | the ability to propagate an impulse |
What waveform represents depolarization of the atria? | P WAVE |
What waveform represents AV delay? | PR segment |
What waveform represents combined atrial depolarization and AV delay? | PR interval |
What waveform represents depolarization of ventricles? | QRS Complex |
What waveform represents ventricular contraction? | ST segment |
What waveform represents re-polarization of ventricles? | ST segment |
When doing a standardization it should measure? | 10mm or 1 mv |
Whenever a change is in motion... | a current is produced |
If the SA node has a permeability change of 60-100 bpm the heart will be | 60-100 bpm |
When 2 or more limbs are used to form a neutral negative point this is called? | unipolar |
What are the unipolar limb leads? | AVR, AVL, AVF, chest leads |
What are the bipolar limb leads? | I, II, III |
Which lead is usually used for continuous monitoring of the heart? | 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? | LL+ and LA- |
Current moving toward a positive electrode records a what deflection? | positive |
A current moving away from a positive or toward a negative records a what deflection? | negative |
The galvanometer fluctuates due to what? | A current flowing through a magnectic field |
When doing the chest leads the limb leads act as a positive or negative electrode? | negative |
What are the two principles stylus works on? | Heat and pressure |
What is the rate of automaticity fro the SA Node? | 60-100 bpm |
What is the rate of automaticity fro the AV Node? | 40-60 bpm |
What is the rate of automaticity fro the bundle of His, bundle branches and purkinje fibers? | 20-40 bpm |
What is the function of the patient cable? | carry the electrical current from the patient to the machine |
What is the function of electrodes? | Carry electrical current from patient to patient cable |
The ECG machine operates on how many volts and what cycle output? | 110-120 volts and 60 cycle outlet |
What is the usual paper speed? | 25mm/sec |
When measuring vertically each small square is equivalent to? | .1 mv |
When measuring horizontally each small square is equivalent to? | .04 sec |
What is the usual standard knob setting? | gain x1 |
If your receive a wandering baseline during chest leads, how would you correct it? | ask the patient to hold their breath, make sure cable isnt hanging |
To decrease the amount of muscle tremors where should you place electrodes? | On trunk of body |
What are the causes of indistinct baseline? | too much or too little heat and pressure |
AC interference is on the patient or machine end? | machine end |
If muscle tremor is recorder on leads I and II what would be the probable cause? | RA |
What is the abbreviation for electrocardiogram? | ECG |
Why does AVR normally have a negative deflection? | Current in the heart is going toward a negative electrode |
What supplies the cardiac musculature with oxygenated blood? | coronary arteries |
Where do the coronary arteries originate from? | Aorta |
What does systole mean? | contraction |
What does diastole mean? | Relaxation |
Cardiac venous blood enters the right atrium via the? | coronary sinus |
What is the outer layer of the heart? | Epicardium |
What is the middle layer of the heart? | Myocardium |
What is the inner layer of the heart? | endocardium |
The amount of blood pumped out to the body by the LV each minute is?? | cardiac output |