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9 Cards in this Set
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- Back
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P wave on ECG
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atrial depolarization resulting from an action potential in the SA node
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ST segment- What changes are abnormal?
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More than 1 mm elevation in the standard leads or 2 mm in the precordial leads is abnormal in this segment. No more than 0.5 mm depression should be seen in any lead
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Describe the J point
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the junction between the QRS complex and the ST segment
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T wave represents...
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ventricular repolarization
should not exceed 5 mm in height in the standard leads or 10 mm in the precordial leads |
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With intense vagal stimulation, what occurs in terms of neural regulation?
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intense vagal stimulation depression both atrial and ventricular contractility by stimulation of the muscarinic receptors that alter the myocyte cAMP levelm by inhibitrion of norepinephrine relase from nearby sympathetic nerve terminals by acetylcholine and inhibition of adrenergic receptor activation- in other words there is decrease contractility due to stimulation of the muscarinic receptors.
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What occurs when the stellate ganglion is stimulated?
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increase sympathetic cardiac fibers- increase HR, increase contractility and ejection fraction-
right affect more HR left- affect more contractility |
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What percent of cardiac output perfuse the coronaries
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4% about 250cc/mim
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what determines coronary blood flow?
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the duration of diastole and the difference between diastolic pressure and left ventricular end-diastolic pressure
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Formula for ejection fraction
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EF= EDV- ESV/EDV
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