Term
| DESCRIBE THE HYPOXIC CELLS DEPOLARIZATION. |
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Definition
| IN A NML CELL THE ST SEGMENT IS A PERIOD OF DEPOLARIZATION, ALL THE CELLS SHOULD BE DEPOLARIZED AND ALL THE CELLS SHOULD BE AT THIS SAME STATE. WHEN YOU HAVE HYPOXIC CELLS THE CELL GETS THE SIGNAL TO DEPOLARIZE AND WAITS. THERE SHOULD BE AN ISOELECTRIC LINE AND ALL OF A SUDDEN THEY CATCH UP AND DEPOLARIZE, MY ST SEGMENT IS NOW HAS ELECTRICAL ACTIVITY. |
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Term
| WHAT IS THE TRANSITION POINT BETWEEN PHASE 2 AND PHASE 3? |
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Definition
| WHEN THE CA CHANNELS CLOSE. IN PHASE 2 I HAVE CALCIUM AND POTASSIUM AND IN PHASE 3 I CLOSE THE CA AND JUST HAVE POTASSIUM |
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Term
| WHAT HAPPENS WHEN K EFFLUX OCCURS? |
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Definition
| THE CELL HAS A WAVE OF REPOLARIZATION. UNLIKE THE QRS COMPLEX THE REPOLARIZATION OF THE VENTRICLES OCCURS CELL TO CELL THAT IS VERY SLOW. |
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Term
| HOW DOES REPOLARIZATION OCCUR? WHICH LAYER GETS REPOLARIZED FIRST? |
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Definition
| FROM EPICARDIUM (OUTSIDE) TO ENDOCARDIUM (INSIDE). The cells on the surface of the heart near where we have our superficial coronary arteries, it begins on the surface and then moves into and through the wall of the ventricle so I end up with a wave of repolarization. |
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Term
| WHAT HAPPENS WHEN YOU PUT ICE COLD SALINE ON THE HEART? |
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Definition
| They will invert because when you make the outside cold, the inside still has warm blood and will repolarize before the outside. The endocardium repolarizes before the epicardium which means that my wave of repolarization is reversed which reverses my T waves. |
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Term
| WHY DOES THE P WAVE AND T WAVE LOOK SIMILAR? |
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Definition
| because just as the atrial myocytes depolarize from cell the cell the ventricular myocytes repolarize from cell to cell. |
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Term
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Definition
| It’s a ventricular myocyte that decides it is going to send a signal for everyone else to contract before the next signal comes down. A PVC is from cell to cell, which is slow, so that’s why a PVC is so wide. |
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Term
| WHAT ELECRICAL CONDUCTION PATHWAYS GENERATES A PVC? |
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Definition
| SA NODE. IF IT WAS GENERATED BY A AV NODE IT WOULD BE A JUNCTIONAL RHYTHM. |
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Term
| WHY DON'T YOU SEE REPOLARIZATION AFTER A PVC? |
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Definition
| PVC because I didn’t depolarize in a wave front phenomena therefore since they are all depolarizing at different times they will not repolarize in a wavefront phenomenon. . They will repolarize but we won’t see it because they will be doing it at different times. |
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Term
| PVCS THAT ARE GENERATED AT THE BASE OR APEX IS MORE CONCERNING? |
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Definition
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Term
| WHY IS GENERATION OF PVCS AT THE BASE MORE CONCERNING? |
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Definition
| If I contract from the bottom up, the base first, this means that near the outflow valves I am pushing the blood towards the apex however if I contract my apex first the blood will go up and out. |
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Term
| WHAT HAPPENS IF THE WAVE OF DEPOLARIZATION WOULD START AT THE VENTRICULAR BASE? |
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Definition
| THE SV WOULD BE DECREASED |
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Term
| HOW MANY SEC SHOULD TO P WAVE AND PRI BE? |
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Definition
| P WAVE <0.12 SEC. (3 SMALL BOXES) LONGER WITH CONDUCTION DELAY, HYPERTROPHY, OR BOTH. PRI 0.12-0.2 (3-5 BOXES) PROLONGED PRI = AV BLOCK |
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Term
| HOW LONG SHOULD THE QRS COMPLEX AND ST SEGMENT BE? |
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Definition
| QRS COMPLEX IS 0.04-0.12 1-3 BOXES. ST SEGMENT IS 0.12-0.16 (3-4 BOXES) |
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Term
| WHAT ALLOWS RAPID DEPOLARIZATION OF THE VENTRICLES? |
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Definition
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Term
| WHAT REPRESENTS THE TIME REQUIRED TO DEPOLARIZE THE ATRIA AND THE AV JUNCTION? |
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Definition
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Term
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Definition
| BEGINNING OF THE ST SEGMENT |
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Term
| WHAT SPEED DOES THE EKG PAPER RUN AT? |
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Definition
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Term
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Definition
| = 5 SMALL BOXES WHICH ARE 0.O4SEC WHICH EQUALS 0.2SEC |
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Term
| FOR A BOX VERTICALLY HOW MANY M/V IS IT? |
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Definition
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Term
| FOR A LARGE BOX (5 SMALL BOXES) HOW MANY MV IS THAT? |
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Definition
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Term
| DESRIBE THE PR SEGMENT AND PRI. |
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Definition
| THE AMOUNT OF TIME THE AV NODE HOLDS ON TO THE SIGNAL. In contrast to that, the PR interval is the amount of time required to travel from the SA node to the bundle of his. . P wave plus PR segment equals PR interval. |
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Term
| WHAT 2 STATES WILL THE J POINT CHANGE? |
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Definition
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Term
| WHICH WAY IS THE T WAVE PEAKED TOWARD? |
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Definition
| MORE TOWARD THE DISTAL PORTION. |
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Term
| WHAT IS THE QT INTERVAL MOSTLY? |
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Definition
| VENTRICULAR REPOLARIZATION |
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Term
| WHY CAN'T WE SAY THAT THE QT INTERVAL WILL BE X AMOUNT OF BOXES LONG? |
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Definition
| BECAUST IT CHANGES WITH HEART RATE |
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Term
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Definition
| THE QT INTERVAL THAT HAS BEEN CORRECTED FOR HR. |
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Term
| WHAT IS THE FORMULA FOR QTC? |
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Definition
| THE QTI / SQUARE ROOT OF THE R-R INTERVAL. |
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Term
| WHAT IS THE R-R INTERVAL AN INDEX OF? WHAT SHOULD IT BE LESS THAN? |
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Definition
| THE HEART BEAT. 0.44 SEC. |
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Term
| WHAT IS CONSIDERED A PROLONG QT INTERVAL? |
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Definition
| >0.44SEC. If the patient is bradycardic his QT interval will be prolonged. |
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