EkG - EKG Delay between the P wave and the QRS complex is...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Ventricular Pressure Changes During Cardiac  Cycle 1.Isovolumetric Contraction  and 1st heart sound (AV  valves close)  2.Ejection Phase  3.Ventricular pressure falls  and 2nd heart sound  (semilunar valves close)  4.Isovolumetric relaxation  lasts until pressure in  ventricles falls below the  pressure in the atria  5.Rapid filling phase of  ventricles 6.Atrial systole  ejects final volume of blood  into ventricles Fig. 13.14 
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Electrocardiogram (EKG, ECG) EKG records potential  differences across the  surface of the heart P, QRS and T waves S-T segment and the AP
Background image of page 2
Muscle Fiber Action Potential Systole-Contraction Diastole-Relaxation Atrial Systole during last  0.1 sec of ventricular  diastole
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
EKG The potential difference  across the atria creates  the P wave. When about half of the  atrial muscle fibers are  depolarized, the P wave  reaches its peak  amplitude.
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
Background image of page 7
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: EKG Delay between the P wave and the QRS complex is the time required to stimulate the AV node and eventually the Bundle of His and Purkinje fibers Depolarization of the ventricles occurs from the inside toward the outside and produces the QRS complex Repolarization occurs from the outside toward the inside and produces the T wave EKG help find cardiac problems Ventricular Tachycardia: SA node no longer controls the contractile rate of the centricles because of an ectopic pacemaker Fibrillation: Rapid and uncoordinated contractions that, in ventricles, will lead to death because the brain and heart have severe O 2 deficit. Flutter: rapid but coordinated contractions (> 200 bpm) EKG help find cardiac problems-Heart rate-Bradycardia: <60 bpm-Tachycardia: > 100 bpm...
View Full Document

Page1 / 7

EkG - EKG Delay between the P wave and the QRS complex is...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online