8. Even though it is trivial that Beta Blockers might have negative inotropic effect on theheart, but they improve the overall heart function in heart failure at the end and used forthis condition, because:a. They decrease reflex overload of the heartb. They inhibit RAAS systemc. They decrease after loadd. They slow electrical conduction of SA and AV nodes which increases the filling timeof the ventricles which improves extraction fraction in HFFEFe. All of the above

Beta-blockers act on the Beta 1 receptors which are located in the heart and it slows down the…

Answered: Even though it is trivial that Beta…

Phlebotomy Essentials

6th Edition

ISBN:9781451194524

Author:Ruth McCall, Cathee M. Tankersley MT(ASCP)

Publisher:Ruth McCall, Cathee M. Tankersley MT(ASCP)

Chapter1: Phlebotomy: Past And Present And The Healthcare Setting

Section: Chapter Questions

Problem 1SRQ

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Similar questions

An ectopic pacemaker refers to the condition in which _____. A the rate at which the SA node cells undergo spontaneous depolarization is abnormal B "all of the heart cells function independently of one another such that the heart vibrates, but fails to pump blood" C action potentials in the heart are initiated by a region other than the sinoatrial node D the endothelial cells
6T Sinuatrial node (SA) is the pacemaker of the heart because: O a. It has the largest rate of activity out of O b. It has the largest resting membrane potential O c. Is has autonomic innervations o d. It is affected by hormones O e. It is protected by surrounding tissues Next page us page
A 28-year-old athlete is noted to have a baseline heart rate of 55bpm, which his trainer attributes to excellent parasympathetic (vagal) tone. This parasympathetic effect normally increases Ach release at the SA and AV nodes. Ach release into AV node leads to which of the following effects of its fibers? a. increased action potential amplitudeb. increased conduction velocityc. increased K+ equilibrium potentiald. Hyperpolarizatione. increased rate of depolarization of the pacemaker potential
1. Age-related changes in the heart’s electrical conduction system such as fibrosis and loss of specialized cells and fibers in the SA node and fibrosis of AV node and left anterior fascicle contribute to the development of (choose all that apply): a. Normal heart rate at rest b. Increase in atrial ectopy (irregular, rapid heartbeats) c. Increase in episodes of bradycardia (slow heart rate) d. Increased incidence of heart block. 2. Describe 3 age-related changes in the lungs that have a negative impact on preventing lung infections.
1) When warfarin is prescribed with antibiotic sulfadiazine, what be the most possible interaction? a. Sulfadiazine and warfarin would have potentiation effect b. Sulfadiazine and warfarin would have antagonistic effect c. Warfarin's effect would decrease because more free drugs are available in plasma d. Warfarin's effect would increase because more free drugs are available in plasma e. There is no interaction between them
The Frank-Starling Law says that stroke volume a. is constant b. increases with deceased blood pressure c. increases with increased venous return d. increases with afterload e. increases with heart rate
occur until they are fully com * Which of the following statements about elasses of drugs used for arrhythmia is INCORRECT? Sodium channel blockers prolong phase 0 and depresses phase 4. b. Calcium channel blockers prolong phase 2. Potassium channel blockers prolong phase 2. d. d. None of the above is correct. a. C. Adenosine blocks K* channels in atria. 30. Which of the following statement about aneurysm is INCORRECT? * dissecting aneurysm is a type of false angurvem and it is a life threatening condition. D. One of the factors responsible for development of aneurysm is high blood pressure. c. True aneurysm involves a tear in innermost layer of blood vessel. d. It can lead to formation of thrombus and emboli.
(please type answer).
Decreasing blood pressure to the Aortic Arch & Carotid Sinuses should reflexly: decrease heart rate & increase stroke volume increase vascular resistance & decrease heart rate decrease stroke volume & decrease vascular resistance A. B. C. D. increase cardiac output & increase vascular resistance Using the Baro-receptor feedback mechanism, the parasysmpathetic nervous system can affect which of the following variables to adjust blood pressure? A. heart rate stroke volume vascular resistance B. C. D. contractility An individual possessing only the A & B antigens is said to be of which blo fype? A. A+ В. AB+ С. AB- D.
Nursing When comparing Ist, 2nd and 3rd degree heart block: a. Which has the same contraction rate in the ventricles as in the atria? b. Which has (have) a slower ventricular rate than atrial rate? C. Which has a very slow but regular ventricular beat? d. In 3rd degree heart block, where is the atrial rate set? Where is the ventriclar rate set ?
1. In ventricular fibrillation, there is no pattern visible in the EKG. What does this mean in terms of contraction? A. contraction will have no visible pattern either and the ventricles will be unable to eject much blood B. the pattern doesn't matter; contraction of the ventricles will not be affected as long as ventricular myocytes continue to depolarize and depolarize C. the ventricular myocytes will be unable to contract C. contraction will become constant and ventricles will be unable to fill with blood 2. Which structure follows depolarization of the SA Node and atria in the cardiac conduction system? A.ventricular myocytes B.AV Node C.left and right bundle branches D.AV bundle E Purkinje fibers 3. Hypertension increases afterload for the heart which in turn A. increases Stroke Volume B. decreases Stroke Volume C.increases Cardiac Output D.increases Venous Return
I need to calculate the approximate heart rate based on the given ECG results, but I can't get how to determine the length of time between two consecutive R waves. What I see, it's one second between the two highest waves (I suppose they are R waves). But it means the heart rate should be 60 beats per minute, but there is no option for this answer. Teach me how to determine correctly the length of time between two consecutive R waves.

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