Term
| Graphic recording of electrical potentials produced by heart and muscle during different ohases of the cardiac cycle |
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Definition
ECG/EKG
(Electrocardiogram/Electrocardiograph) |
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Term
| Sequence of events that occur during one complete heartbeat |
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Definition
Cardiac Cycle
Note: P,Q,R,S,T |
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Term
| Relaxation of the heart, just prior to and during the filling of the chamber |
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Definition
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| Contraction of the heart, process of partially emptying chambers |
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Definition
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Definition
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Term
| Length of a wave or length of a wave within a segment,beginning of one wave to beginning of anohter |
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Definition
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| Portion of the ECG between two waves |
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Definition
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Definition
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Term
| Stage when heart is at rest |
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Definition
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Term
| Heart muscle contraction in reponse to electrical stimulus and occurs when electrolyte move across the cell membrane |
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Definition
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Term
| Heart muscle relaxation occurs when electrolytes move back across the cell membrane making the cell ready for the next electrical impulse |
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Definition
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Term
| What part of the heart is the natural pace maker of the |
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Definition
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Term
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Definition
- Basis for records and consultation
- Serial ECG's can act as an aid in prognosis and diagnosis of cardiac disease
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Term
| Electrical impulses that are transmitted through the heart by specialized cells this is called the: |
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Definition
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Term
| What are five physiologic properties of the cardiac muscle? |
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Definition
- Automaticity
- Excitability
- Refractoriness
- Conductivity
- Contractility
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Term
| Property that allows a cell to reach its threshold potential spontaneously |
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Definition
Automaticity
Remember: The further down the conduction system the slower the rate of automaticity |
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Term
| Property that describes the ease with which a cell can become depolarized |
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Definition
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Term
| The heart muscle will not respond to external stimuli during its period of contraction(depolarization) |
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Definition
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Term
| Property that allows electrical current to trael from one part of the heat to another |
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Definition
Conductivity
Remember: This is best measured with a echocardiograph |
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Term
True or False
The ECG measures the contraction itself |
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Definition
False
The ECG machine only measures the stimulus for contraction |
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Term
| Corresponds to atrial depolarization or contraction and can be positive, negative or biphasic |
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Definition
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Term
| This is a flat baseline beginning at the end of the P wave |
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Definition
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Term
| This represents ventricular depolarization or contraction |
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Definition
QRS Waves
Remember: Q (-), R(+), S(-) |
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Term
| Represents ventricular repolarization or relaxation and can be positive negative or biphasic |
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Definition
T Wave
Remember: Every QRS complex has a T wave following it |
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Term
| What can the electrode clips be moistened with to assure good contact? |
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Definition
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Term
| Where do red,black,green,white and brown electrode clips get placed? |
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Definition
- Red- Left Rear Leg
- Black- Left Front Leg
- Green- Right Rear Leg
- White- Right Front Leg
- Brown- Chest (Tip of Sternum)
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Term
| What lead is the most common used? |
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Definition
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Term
| If an upward deflection is produced when electrical impulses travel towards a positive electrode respectively a downward deflection would do what? |
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Definition
| Produce electrical impulses traveling toward a negative electrode |
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Term
| What do you always want your sensitivity and speed at? |
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Definition
Speed: 50 mm/sec
Sensitivity: 1 cm |
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Term
| What are the normal heart rates for dogs and cats? |
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Definition
- Dogs: 70-220 beats/min
- Cats: 120-240 beats/min
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Term
| Appears on the ECG as even peaked, regular voltages superimposed throughout the tracing |
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Definition
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Term
| Appears on the ECG as random, irregular voltages superimposed on the tracing |
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Definition
| Muscle Tremor Interference |
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Term
| Appears on the ECG as fluctuation of the tracing up and downward on the grid |
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Definition
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