ANCC Cardiac & Vascular RN Certification with verified answers

AV Node CORRECT ANSWER Back-up Pacemaker to SA node Junctional rhythms rate: 40-60 bpm Slows impulses coming from SA to the ventricle Screens rapid atrial impulses to protect ventricles Strong PNS/ Weak SNS Bainbridge (atrial) reflex CORRECT ANSWER Increases heart rate in response to increased venous return. works when patient is fluid overloaded Baroreceptor reflex CORRECT ANSWER Activated by abnormal (High) BP Decreases BP decreases sympathetic cardiac activity works when patient is dehydrated Diastole CORRECT ANSWER Isovolumetric ventricular relaxation Ventricular filling Isovolumetric ventricular contraction CORRECT ANSWER Atria relaxed All Valves are closed Isovolumetric ventricular relaxation CORRECT ANSWER Atria relaxed Ventricles relaxed All Valves: Closed location of apex of heart CORRECT ANSWER Tip of term-7the heart at the 5th intercostal space, medial to left mid-clavicular line Location of Base of heart CORRECT ANSWER It's the widest part Runs across 2nd intercostal space Location of point of maximal impulse CORRECT ANSWER Apex of Heart Location of the Heart CORRECT ANSWER Approx. 2/3 to the left of the mid-sternal line P wave CORRECT ANSWER depolarization of SA node and atria Atrial contraction Parasympathetic Nervous System CORRECT ANSWER Rest and Digest Release of acetylcholine onto cholinergic receptors Decreases HR Decreases Cardiac Output Constriction of coronary arteries Dilation of peripheral arteries Bronchoconstriction Bladder relaxation Pupil constriction Purkinje Fibers CORRECT ANSWER Individual cells that directly stimulate ventricular muscle contraction Back-up pacemaker if SA and AV node fail to fire Idioventricular rhythms: 20-40 bpm Strong SNS/Weak PNS QRS complex CORRECT ANSWER Q wave: depolarization of interventricular septum R and S waves: depolarization of right and left ventricles QT interval based on patient's HR formula CORRECT ANSWER 1. Assume QT interval at HR of 60 is 0.42 2. For ever 10 bpm that patient's HR exceeds 60 bpm, subtract 0.02 sec from 0.42 sec QT interval will be longer when.. CORRECT ANSWER the HR is slower