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29 Cards in this Set
- Front
- Back
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2 FUNCTIONS OF THE HEART
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1) RECEIVE BLOOD AT LOW PRESSURES DURING DIASTOLE
2) EXPEL BLOOD TO ALL AREAS OF THE BODY |
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MYOCARDIUM RECIEVES OXYGENATED BLOOD FROM THE
_________ AND _________ CORONARY ARTERIES. |
RT AND LEFT
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THE CORONARY SINUS EMPTIES INTO...
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THE RT ATRIUM
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DEOXYGENATED BLOOD RETURNS TO THE RIGHT ATRIUM VIA THE...
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SVC AND IVC
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AUTOMATICITY
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THE ABILITY TO GENERATE AN ELECTIRCAL IMPULSE
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EXCITABILITY
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THE ABILITY TO RESPOND TO AN IMPULSE
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CONDUCTIVITY
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THE ABILITY TO TRANSMIT IMPULSE FROM CELL TO CELL
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CONTRACITLITY
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ABILITY OF MYOCARIAL CELSS TO CONTRACT IN RESPONSE TO AN IMPULSE
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EXTENSIBILITY
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THE ABILITY OF MUSCLE CELLS TO STRETCH AS THE CHAMBERS OF THE HEART FILL WITH BLOOD
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SA NODE
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PM OF THE HEART
WALL OF THE RT ATRIUM AT THE JUNCTION OF THE SVC INITIATES IMPULSES AT RATE OF 60-100/MIN |
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SA NODE TRANSMITS IMPULSE THRU THE ATRIA VIA
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INTERNODAL PATHS OR TRACTS
(CONNECT SA TO AV NODE) |
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SA NODE BLOOD SUPPLY
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RCA - 60%
LEFT CIRCUMFLEX - 40% |
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AV NODE
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RCA - 90%
LEFT CIRCUMFLEX - 10% |
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BUNDLE OF HIS
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LAD
POSTERIOR DESCENDING BRANCH OF RCA |
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LEFT BUNDLE BRANCH
POSTEROIR FASCICLE ANTERIOR/MIDDLE FASCICLES |
LAD, POST DESC BRANCH OF RCA
SEPRAL PERFORATING BRANCES OF LAD |
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RIGHT BUNDLE BRANCH
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RCA AND LAD
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AV JUNCTION
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MADE OF ATRIAL APPROACHES TO THE AV NODE, AV NODE, NON-BRANCHING PORTIONS OF BUNDLE OF HIS.
INHERENT RATE 40-60/MIN |
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PACEMAKER CELLS IN THE PURKINJE FIBERS WILL GENERATE
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AN IMPULSE UP 40 TIMES PER MINUTE SHOULD BOTH THE SA AND JUNCTION FAIL TO GENERATE IMPULSES.
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POLARIZED
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CELL RESTING
MORE (-) CHARGES INTRACELLULARY MORE (+) CHARGES ON THE OUTSIDE |
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DEPOLARIZED
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WHEN ACTIVATED, MORE (+) INSIDE, OUTSIDE IS MORE (-)
DUE TO THE MVMT OF NA IONS INTO THE CELL |
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REPOLARIZED
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WHEN NA+ MOVES OUT OF THE CELL, THE INSIDE OF THE CELL BECOMES MORE (-)
PHASE 1 CALCIUM MOVES INTO THE CELL WHILE POTASSIUM MOVES OUT PHASE 2 SODIUM AND CALCIUM MOVE INTO THE CELL, K MOVES OUT PHASE 3 K MOVES RAPIDLY FROM THE CELL PHASE 4 SODIUM AND CALCIUM RETURN TO THE OUTSIDE, K MOVES BACK IN. AT THE END, THE CELL IS POLARIZED. |
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PRI interval
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beginning of the p wave to the beginning of the QRS complex
0.12 to 0.20 seconds |
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PR segment
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the end of the p wave to the beginning of the QRS
the amount of time is take the impulse to be delayed in the AV node |
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QRS
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width represents the amt of time it take to depolarize the ventricles
normal: 0.10 sec |
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ST SEGMENT
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the start of ventricular repolarization
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J point
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the point at which the ST segemnt leaves the complex
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QT interval
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the length of time it takes the ventricles to de/repolarize
time varies with age, gender, HR |
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U wave
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seen best in V1-V4
usually prominent in HYPOKALEMIA |
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0
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.
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