ECG
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| P WAVE | show 🗑
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| QRS COMPLEX | show 🗑
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| T WAVE | show 🗑
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| show | caused by the greater muscle mass of the ventricles and hence greater number of cellular depolarizations
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| show | occurs during the activation of the septal fascicle and the depolarization of the interventricular sseptum
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| R WAVE SPIKE | show 🗑
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| show | useful for the clinician in diagnosing heart attacks (MI), conduction abnormalities, arrhythmias, toxicity and electrolyte imbalances
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| show | NODAL CELLS, SPECIALIZED CONDUCTING FIBERS, CONTRACTILE OR MYOCARDIAL CELLS
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| show | involved in generating the internal action potentials of the heart. They are localized in 2 areas of the heart, the SA and AV node.
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| 2. SPECIALIZED CONDUCTING FIBERS | show 🗑
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| show | INTRINSIC CONDUCTION SYSTEM OF THE HEART
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| show | makes up over 90 percet of the heart and is responsible for muscle contraction and the pumping of blood
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| ELECTRICAL AXIS OF THE HEART | show 🗑
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| ELECTRICAL AXIS RANGE | show 🗑
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| LEFT AXIS DEVIATION | show 🗑
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| show | when electrical axis is greater than +90 degrees and can be caused by right ventricular hypertrophy, an anterior-lateral myocardial infarction, pulmonary emboli, or normally occurs in tall thin adults
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| show | represents the time it takes electrical impulse to spread from the beginning of atria depolarization to the beginning of ventricular depolarization and is normally 0.12 to 0.20 seconds
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| show | calculated from the beginning of the P wave to the first Q wave deflection in the QRS complex.
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| show | may be caused by longer delay at the AV node, hypothyroidism, or various drugs.
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| show | suggests that the impulse has originated in areas other than the SA node.
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| PR SEGMENT | show 🗑
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| show | if longer, AV node block
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| QRS DURATION | show 🗑
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| QRS DURATION | show 🗑
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| QRS - prolonged | show 🗑
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| show | is a measurement of the duration of the action potential and thus the refractory period in the ventricles and is calculated from the beginning fo the Q wave to the end of the T wave
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| QT INTERVAL | show 🗑
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| ST SEGMENT | show 🗑
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