1. Vital Signs
Start

2. TABLE OF CONTENTS Spirometer Electrocardiogram Vital Signs
Click on a Topic
Vital Signs

3. Spirometer
Vital Signs

4. Electrocardiogram (EKG)
EKG Phases: Ventricular Phases
EKG Phases: Comparison of Atrial and Ventricular Phases
Lead 2 EKG Components
Vital Signs

5. Ventricular Phases Vital Signs Ventricular Ejection (0.25 sec)
Isovolumetric
Relaxation
(0.08 sec)
Isovolumetric
Contraction
(0.05 sec)
Ventricular
Filling
(0.42 sec)
Ventricular Systole
Ventricular Diastole
Vital Signs

6. Comparison of Atrial and Ventricular Phases
Atrial Systole
(0.1 sec)
Atrial Diastole
(0.7 sec)
Ventricular Systole
(0.3 sec)
Ventricular Diastole
(0.5 sec)
Vital Signs

7. Click on an area to identify it
Lead 2 EKG Components
Click on an area to identify it
Vital Signs

8. The P Wave: Caused by atrial depolarization; as a result, the myocardium surrounding the two atria contracts. This is the beginning of ATRIAL SYSTOLE.
Vital Signs

9. The QRS Complex ( sec.): Caused by ventricular depolarization; as a result, the myocardium surrounding the two ventricles contracts. This is the beginnining of VENTRICULAR SYSTOLE. The QRS complex also masks atrial repolarization, since it occurs at the same time. As a result, the myocardium surrounding the two atria relaxes. Therefore, this is also the beginning of ATRIAL DIASTOLE.
Vital Signs

10. The T Wave (0.12 sec.): Caused by ventricular repolarization; as a result, the myocardium surrounding the two ventricles relaxes. This is the beginning of VENTRICULAR DIASTOLE.
Vital Signs

11. The P-Q (or P- R) Interval (0. 12-0. 2 sec
The P-Q (or P- R) Interval ( sec.): The period of time from the beginning of ATRIAL DEPOLARIZATION to the beginning of VENTRICULAR DEPOLARIZATION. This represents the time it takes for the electrical signals to pass from the SA node to the Purkinje fibers.
Vital Signs

12. The Q-T Interval (0.3 sec.) The period of time from the beginning of VENTRICULAR DEPOLARIZATION to the end of VENTRICULAR REPOLARIZATION. This represents the time it takes for the electrical signals to pass through the myocardium surrounding the two ventricles, followed by a wave of repolarization.
Vital Signs

13. The Isoelectric Line or Baseline: The period of time when either no electrical signals are passing through the myocardium (during ATRIAL DIASTOLE and VENTRICULAR DIASTOLE) or the net electrical signal is perpendicular to the LEAD (direction between 2 electrodes on the surface of the skin).
Vital Signs

14. The Isoelectric Line or Baseline: The period of time when either no electrical signals are passing through the myocardium (during ATRIAL DIASTOLE and VENTRICULAR DIASTOLE) or the net electrical signal is perpendicular to the LEAD (direction between 2 electrodes on the surface of the skin).
Vital Signs

15. The ST segment: The period of time from the end of VENTRICULAR DEPOLARIZATION to the beginning of VENTRICULAR REPOLARIZATION.
Vital Signs