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P-R interval 0.16 sec

R. P. T. Q. S. Normal EKG. Q-T interval 0.35 sec. P-R interval 0.16 sec. R. P. T. Q. Ventricular repolarization. Atrial depolarization. S. Ventricular depolarization. Standardized EKGs. Time and voltage calibrations are standardized as shown on figure 11-1.

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P-R interval 0.16 sec

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  1. R P T Q S Normal EKG Q-T interval 0.35 sec P-R interval 0.16 sec R P T Q Ventricular repolarization Atrial depolarization S Ventricular depolarization

  2. Standardized EKGs • Time and voltage calibrations are standardized as shown on figure 11-1. Figure 11-1; Guyton & Hall

  3. Heart Rate Calculation • R-R interval = 0.83 sec • Heart rate = (60 sec)/(0.83 sec) = 72 beats/min min beat

  4. Bipolar Limb Leads • Bipolar means that the EKG is recorded from two electrodes on the body. Figure 11-6; Guyton & Hall

  5. Bipolar Limb Leads (cont’d) 0.5 mV 1.2 mV 0.7 mV Figure 11-7; Guyton & Hall

  6. Other EKG Leads • Chest Leads (Precordial Leads) known as V1- V6 are very sensitive to electrical potential changes underneath the electrode. Figure 11-9; Guyton & Hall

  7. Cardiac Cycle Figure 9-5; Guyton & Hall

  8. Phases of the Cardiac Cycle

  9. Pressure and Volume Relationships in the Cardiac Cycle

  10. A Simple Model of Stroke Volume

  11. Factors Affecting Cardiac Output Figure 20.20

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