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Paramedic cardiac study guide

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Emergency Care in the Streets 8th Edition FISDAP 3 CARDIAC 1. Blood vessels and blood pressure regulation • • (1068) Baroreceptors in the internal carotid arteries and aortic arch generate compensatory responses that facilitate blood pressure regulation by the sympathetic division of the autonomic nervous system (1993) Baroreceptors in the carotid sinus sense decrease in blood flow and activate the vasomotor center in the medulla oblongata, which oversees changes in the diameter of blood vessels 2. Beta 1 stimulation • (315) Increased rate and force of contraction on the heart, increases blood pressure. Chronotropic, Inotropic, dromotropic effects 3. intrinsic pacemaker rates • • • (972) SA Node 60-100 AV Junction 40-60 Purkinje network 20-40 4.ECG P-QRS-T waves • • • • • • • • (982) P wave is the first wave of an ECG complex, represents atrial depolarization and is normally less than 0.11 seconds and its amplitude is less than 2.5 mm tall. (983) PR interval distance from beginning of P wave to the beginning of the QRS complex. The distance represents the time required for an impulse to traverse the atria and the AV junction normally a period of 0.12 to 0.20 seconds. 3-5 small boxes QRS complex, represents ventricle depolarization. Measured from beginning of Q wave to the end of the S wave and should follow each P wave consistently. Normal QRS is 0.11 seconds Q wave represents conduction through the interventricular septum. Normal Q wave s ...
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