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6. What is the difference between the PR interval and the QT interval in electrocardiography?
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- The electrocardiograph records the tracing at standard speed of 25 mm/second. This allows a person to deter- mine the heart rate and the duration of the intervals. Each small box on the ECG tracing measures 0.04s, and each large box measures 0.20s. Five large boxes together measure 1 second. Determining the duration of most intervals is simple by counting the small or large boxes and add the seconds together. To calculate the heart rate, count the number of large boxes, and divide 300 by this number. For example, if you count 4.2 boxes, 300/4.2=71 beats per minute. The normal values or the periods are given in Table 6-3 provided below. Period Normal Value Table 6-3 Normal Values for ECG Periods Heart rate 60-100 beats per minute R-R interval 0.60-1.0s P-R interval 0.12-0.20s Q-T interval 0.42-0.44s QRS complex duration Less than or equal to 0.12s6. How is the patient prepared for cardiac catheterization?6. Patients with what underlying condition cannot undergo Fick’s method of Cardiac output measurement?
- пл ate I aVR rrr Прируу ил II aVL Mappe byyppig aVF VI Пари my при пруиру Isrpriprprprifrifrifrifrifrifu 25mm/s 10mm/mV 40Hz 005C 12SL 254 CID: 26 EI سه شهیدا Vil V4 V5 V610. An EKG with a higher QRS complex than normal... A)None of these are true B)Must mean that the end diastolic volume is higher C)Must mean that the ventricular contraction is stronger than normal D)Must mean that the person is exercising and innervating more cardiomyocytes E)Must mean that atrial repolarization is smaller than usual so we see more ventricular repolarization1. The source of the electrical currents that you measured on the skin throughout a normal electrocardiogram is: a. regional differences in depolarization state between parts of the myocardium b. The SA node cells c. the opening and closing of the tricuspid and bicuspid valves d. depolarizations of the muscle and nerve cells close to the electrode site e. The AV node cells 2. Release or discharge from which of the following is likely to produce a slowing in the rate at which the AV node transmits a depolarization? a. Your coffee cup (caffeine) b. the posterior lobe of the pituitary gland (Oxytocin) c. the sympathetic nervous system d. the parasympathetic nervous system (vagus nerve) e. the medulla of the adrenal gland (epinephrine) 3.Which of the following is unlikely to affect the force of contraction of an individual ventricular myocyte (muscle cell)? a. the amount of…
- 10. If given a diagram of the heart, such as the one below, be able to identify each of the following parts of the conduction system: • sinoatrial (SA) node • • . spread of SA through the 2 atria atrioventricular (AV) node ● • • • 11. Trace the flow of impulses through the conduction system (step by step) and include at what points the following happen: 2 atria contract together AV node delay occurs AV bundle (=bundle of His) bundle branches Purkinje fibers Focus F9. Patients with diastolic heart failure have abnormalities in LV relaxation and distensibility that can be characterized in PV loops, and by echocardiography. Which phase in the PV loop represents the time of isovolumetric relaxation of the LV that can be affected during diastolic failure? 120 LV Pressure 80 (mm Hg) 40 в 20 60 100 140 180 220 LV Volume (ml) A. A B. C. D. D1. is the rhythm regular or irregular 2. determine the heart rate 3. do you have p waves before every QRS 4. Measure the PR interval 5. Measure the QRS duration 6. Are there any early or extra beats 7. is there normal r wave progression in V1-V6? 8. Are the ST segments elevated or depressed? 9. Are there any abnormal Q waves? 10.. Are the T waves of normal size? 11. Are there any U waves? 12. Is there evidence of myocardial ischemia, injury, or infarction? 13. Name this EKG.
