3. Match each of the accompanying ECG tracings with its correct description. b AV heart block a tachycardia c atrial fibrillation d ventricular fibrillation a b c d 4. Pilocarpine is a parasympathomimetic drug that stimulates the release of ACh from nerve fibers of the vagus nerve. What effect does this drug have on heart rate? 5. In addition to the intrinsic cardiac conduction system, which initiates and distributes the electrical impulses that control cardiac activity, many other factors affect the rate at which the heart contracts. The most important of these effects are exerted by the autonomic nervous system (ANS). a. What are the two divisions of the ANS, and how does each division affect heart rate? b. Name two other factors that influence heart rate. 6. Beta-adrenergic blockers are used to treat high blood pressure. Explain how these drugs affect heart rate.
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Match each of the accompanying ECG tracings with the correct description: - First-degree AV heart block - Sinus tachycardia (171 bpm) - Atrial fibrillation - Ventricular fibrillation Show more…
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Lab Activities The following is a copy of the pages found in the LtLabStation activities to be performed during lab A. Heart, ECG, and Pulse Lesson (60 min) 1/8 – Lesson Learning Objectives In this lab, you will record and analyze your own ECG and finger pulse, and observe how these provide different representations of the cardiac cycle. Learning objectives By the end of this lab you will be able to do the following: • Record an ECG and identify the major components. • Explain the temporal relationship between the ECG and the finger pulse. • Interpret events in the cardiac cycle, and relate these to features in the ECG and the finger pulse. 2/8 - What is an ECG? The electrical currents along the heart walls travel through the body and generate changes in the electrical potential of the skin. These changes of potential can be detected by applying electrodes (leads) to the skin (typically wrists, ankles and six location in the heart) and recorded in an Electrocardiogram (ECG or EKG) Figure 1. Electrocardiogram (ECG) Question 1. Describe the events happening during: 1. P wave, 2.QRS complex, 3. T wave, 4. P-R interval, 5. Q-T interval, 6. End of T to following R
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Predict the effects of a drug that blocks the parasympathetic nervous system on blood pressure and heart rate. How would this drug affect the three factors that determine blood pressure? You are presented with a stack of ECGs on your first day of your cardiology rotation and are given a single instruction: "Read them." As you progress through the pile, you note the following abnormalities. Explain from where in the heart or cardiac conduction system each abnormality might have come: a Absent P waves b Abnormally long QRS complex c Abnormally long P-R interval d Extra QRS complexes
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Academic Company will test our drug that is supposed to lower patient cholesterol levels. Patients with high cholesterol will be given the drug and their cholesterol levels will be measured before and after taking the drug. The data is as follows: Patient Before After The two populations are being compared. Explain your answer. Why did you choose graphs? What do the graphs tell you? Choose appropriate graphs to justify your choice. Then perform the computing p-value. And make a decision based on the p-value. Finally, state your conclusion. The context of the problem is to determine the effectiveness of the drug in lowering cholesterol levels.
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