Exam (elaborations)
Unit 3_ CV part 2 cardiac dysrhythmias (1)
- Course
- College Algebra
- Institution
- College Algebra
Unit 3_ CV part 2 cardiac dysrhythmias (1)
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Unit 3: CV part 2 cardiac dysrhythmias1. Heart muscle cells responsible for the mechanical response to electrical impulses.
2. Able to generate electrical impulses. - ANS-myocardial cells
1. Specialized cells which can initiate an electrical impulse.
2. Automaticity: generates an electrical impulse, regular rate and rhythm. - ANS-pacemaker
cells
a. Pacemaker of the heart; located in top area of right atrium.
b. Conduction to: left atrium and atrioventricular (AV) node. - ANS-conduction sys: SA node
AKA: junction, nodal
a. Located between the lower atria and upper ventricle.
b. Conduction to: Bundle of His. - ANS-conduction sys: AV node
AV node to top area of ventricular septum; splits to form the bundle branches - ANS-conduction
sys: Bundle of His
a. right and left bundle branches run down through the ventricular septum
b. in ventricles, the branches bifurcate further - ANS-conduction sys: bundle branches
innervate the ventricular walls - ANS-conduction sys: purkinje fibers
a. Hypoxemia.
b. Electrolyte imbalances: primarily K+ and Mg + +.
c. Acid - base disturbances. - ANS-influences on electr. condu.: myocardial irritability
sympathetic and parasympathetic systems - ANS-influ. on electr. condu: nervous system
epinephrine, norepinephrine - ANS-influ. on electr. condu: catecholamines
lightening, electrical outlets, power tools - ANS-influ on electr condu: electrical stimulus
manipulation of conduction system - ANS-influ on electr condu: cardiac surgery
a. lethal v. nonlethal
b. changes in HR, BP, chest pain, SOB - ANS-influ on electr condu: result of dysrhythmias
affects various sites of action potential in cardiac cycle - ANS-antidysrhythmic agents mech of
action
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