You are learning to read electrocardiograms. You know that the patient you are examining has a pathology affecting the depolarization of his ventricles, therefore you're looking for a change in what portion of his EKG? A. The P wave B. The T wave C. The QRS complex D. The P wave or the T wave, but not the QRS complex E. None of these would be altered Which respiratory measurement is normally the greatest? A. Residual Volume B. Expiratory reserve volume C. Tidal volume D. Inspiratory reserve volume Which of the following would be most likely to be determined with a patient's ECG recording? A. Cardiac output. B. Stroke volume. C. A heart murmur. D. Blockage of conduction of electrical signals between the atria and the ventricles.
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Since the question states that the patient has a pathology affecting the depolarization of his ventricles, we should look for a change in the portion of the EKG that corresponds to ventricular depolarization. The P wave represents atrial depolarization, the QRS Show more…
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22) Which of the following represents the accurate sequence of the spread of cardiac excitation? (2 pts) a) Right atrium – right ventricle – left atrium – left ventricle b) Right ventricle – left atrium – left ventricle – right atrium c) SA node – AV node – bundle of His – Purkinje fibers d) SA node – bundle of His – AV node – Purkinje fibers 23) During the P-Q interval, which of the following mechanical events is/are occurring? Choose ALL that apply. (2.5 points) a) Atria contract. b) AV valves close creating the S1 heart sound. c) Blood volume in the ventricles increases. d) Pressure in the atria increases. e) Ventricles depolarize. 24) Match the ECG components to the appropriate description. (4 points) Matching options: • P wave • PQ interval • QRS complex • ST segment • T wave • TP interval a) Which ECG component corresponds to atrial depolarization? b) Which ECG component corresponds to ventricular depolarization? c) Which ECG component represents the time from the beginning of atrial excitation to the beginning of ventricular excitation? d) Which ECG component represents the time when the contractile muscle fibers of the ventricles are completely depolarized? e) What ECG wave comes immediately before ventricular systole? f) If heart rate increased, which ECG component would change the most? g) Which ECG wave comes immediately before atrial contraction? h) Which ECG wave comes immediately before ventricular relaxation?
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Question 3 In an ECG, the U wave: Question 3 options: Represent s electrical excitation of the atria represents the depolarization of the ventricles represents the return of the ventricles from excited to normal state (repolaization). represents the repolarization of a collection of specilazied muscle fibers that make up the pacemaker system Question 4 Which of the following techniques map the distribution of hydrogen nuclei: Question 4 options: Auscultation MRI ECG Echocardiography Question 5 When a doctor uses a stethoscope, what is being monitored? Question 5 options: The sound made by the electricity spreading through the heart. The sound made by the vibration of the heart and blood as pumping occurs. The sound made by the contractile molecules of the muscles of the heart as they contract. None of the above. Question 6 Which of the following conditions can cause irregularities in the sound of the heart? Question 6 options: Moderate bradycardia. Mild mitral valve regurgitation. Mild atherosclerosis of the coronary arteries. Both a and b.
Asma V.
5. The P wave corresponds to depolarization of the muscle fibers of the 6. The QRS complex corresponds to depolarization of the muscle fibers of the 7. The T wave corresponds to repolarization of the muscle fibers of the 8. Why is atrial repolarization not observed in the ECG? CRITICAL THINKING ASSESSMENT If a person has a heart murmur caused by the improper opening and closing of a heart valve, the ECG or heart sounds (choose one) will be unusual as the blood is forced through a more narrow opening (stenotic valve), or the blood backflows because the valve does not close properly (incompetent valve). Explain your reasoning for the answer choice. PART D: Assessments
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