The Steps of The Cardiac Cycle

Slides:

Advertisements

Similar presentations

Cardiac Considerations

Advertisements

 a.Sinoatrial node (SA node)  b.Atrioventricular node (AV node)  c.Atrioventricular bundle (AV bundle)  d.Right and left atrioventricular bundle.

Associated Prof. of physiology

Structure and Function

Cvs module phase II MBBS CARDIAC CYCLE PHYSIOLOGY CARDIOVASCULAR MODULE PHASE II

Chapter 18 - The Cardiovascular System: The Heart

THE CARDIAC CYCLE.

The cardiac cycle Pressure and volume changes and associated valve movements during the cardiac cycle. Describing the sequence of events in one heart beat.

20.18 The Cardiac Cycle Slide number 1 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. AV valves opened Semilunar.

The Cardiac Cycle. Learning Outcomes During diastole blood returning to the atria flows into the ventricles. Atrial systole transfers the remainder of.

Electrical conduction in the Heart

Vital Signs Start.

HEART PHYSIOLOGY & CONDUCTION SYSTEM

Heart pt 2: Function. Cardiac Cycle The heart goes through the cardiac cycle to contract and pump blood through the body efficiently The cycle is deemed.

Circuits Chambers Valves (one-way-flow) Myocardiocytes The Heart.

Human Anatomy & Physiology FIFTH EDITION Elaine N. Marieb PowerPoint ® Lecture Slide Presentation by Vince Austin Copyright © 2003 Pearson Education, Inc.

C ARDIAC C YCLE. E ARLY DIASTOLE Pressure in ventricles is low. Pressure difference causes A-V valves to open and the ventricles to fill. 70% of returning.

EKG Ventricular Pressure Aortic Pressure Ventricular Volume P Mm Hg ml A The P wave denotes atrial depolarization.

Chapter 15.4: Electrocardiogram

Learning Objectives... To understand the stages of the cardiac cycle.

The Cardiac Cycle. The repeating pattern of contraction (systole) and relaxation (diastole) of the heart The repeating pattern of contraction (systole)

Cardiac Conduction System. (1) Conduction System of Heart Conduction System = Heart Beat & Pumping Cardiac Contractions = Unconscious –Autonomic Nervous.

The Steps of The Cardiac Cycle “The Rhythm is gonna get you”

Cardiac Cycle Dr. Wasif Haq. Introduction Cardiac events that occur from beginning of one heartbeat to the beginning of the next. Inversely proportional.

The cardiac cycle Describing the sequence of events in one heart beat.

The Cardiac Cycle.

Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings The Heart: Associated Great Vessels  Arteries  Aorta  Leaves left ventricle.

The cardiovascular system in action 1/Cardiac function and cardiac output 2/ Cardiac cycle.

Circuits Chambers Valves (one-way-flow) Myocardiocytes The Heart.

The Cardiac Cycle.  0.0 – 0.05 seconds: Atrial depolarisation: a wave of depolarisation spreads over the atria from the Sino Atrial Node initiating the.

The Cardiac Cycle. The repeating pattern of contraction (systole) and relaxation (diastole) of the heart The repeating pattern of contraction (systole)

The cardiac cycle Ventricular filling the diastole refers to the period of the cardiac cycle during which the ventricles are filling with blood the systole.

Circulatory System How does the heart work? Heart beat Motor nerve Skeletal muscle The heart is myogenic  Generates its own electricity.

Series of events that constitute a complete heartbeat

Cardiac Cycle  Refers to pattern of ;  Systole (contraction)  Diastole (relaxation)  Shown by the heart in one complete cycle  On average this 1.

DR. ZAHOOR ALI SHAIKH CARDIOVASCULAR SYSTEM LECTURE - VII.

Pressure changes during the cardiac cycle. P N L Atrial systole Ventricle systole Diastole.

PHYSIOLOGY OF THE HEART NOTES. Cardiac Conduction System SA node - (pacemaker) sinoatrial AV node – atrioventricular AV bundle Initiate and distribute.

Events of the Cardiac Cycle Why did the blood flow across the valve? Desire - it wanted to Ability - it could do it Movement = Desire X Ability Flow.

BASIC INTRODUCTION OF ANATOMY OF HEART

Cardiac Cycle By Dr. Khaled Ibrahim Khalil By Objectives: By the end of this lecture, you should : By the end of this lecture, you should :  Describe.

1. LECTURE – 3 DR. ZAHOOR ALI SHAIKH 2 CARDIAC CYCLE  Cardiac events occurring during one beat (systole & diastole) are repeated during the next beat.

Cardiac Cycle- 1 Mechanical events, Volume & Pressure changes in cardiac chambers & the great vessels during the cardiac cycle.

Conduction system of the Heart Where is the heart?

July 16 1 The cardiac cycle July 16 2 The cardiac cycle The cardiac events that occur from the beginning of one heartbeat to the beginning of the other.

1 Topics to be addressed: Blood Anatomy of Blood Vessels Anatomy of the Heart The Conduction System The Cardiac Cycle Cardiodynamics Blood Flow and its.

2. Systole: Period of ejection. Continued ventricular

So pressure chambers that are occurring in the ventricle chamber are now being transferred into the aortic chamber. So pressure in the aorta, will now.

Cardiac Cycle and Sounds

What are the events that occur during one heart beat?

Head of Medical Department Tuanku Fawziah Hospital

Jocelyn Sassano & Sarah Miller

The Electrocardiogram

Cardiovascular System Notes

Dr. Arun Goel Associate professor Department of Physiology

Contents The Anatomy of the Heart The Cardiac Cycle: Diagrams 1-14

Lecture 1A. Part 1 The HEART and Cardiac Cycle Holdorf RVT

UNIT 3 NOTES: Cardiac Conduction System

Cardiac Conduction System

EKG AUTORHYTHMICITY.

Cardiac cycle DR S.PARTHASARATHY MD., DA., DNB., DIP. DIAB. PhD, FICA, IDRA, Diploma in software based statistics.

The Heart Circuits Chambers Valves (one-way-flow) Myocardiocytes.

Cardiovascular system- L3

CARDIC CYCLE Dr. Haseeb Sattar.

The cardiac cycle.

UNIT 2 NOTES: Cardiac Conduction System

Cardiovascular system- L4

Dr. Amin Jan Assistant Professor (Physiology) NwSM, Peshawar Pakistan Cardiac cycle.

Presentation transcript:

The Steps of The Cardiac Cycle “The Rhythm is gonna get you”

Atrial Systole Lasts 0.1 sec Atria contract, and the ventricles relax SA node depolarizes This causes a P wave on an EKG Forces blood through the open AV valves into the ventricles Creates Systole Atrial Systole contributes to the final forced push of about 25 mL of blood into the ventricles from the atria

Ventricular Systole Ventricles depolarize and the atria relax Lasts 0.3-0.5 seconds At the beginning of this phase the pressure rises in the ventricle chambers and it pushes blood against the AV valves forcing them shut Myocardium begins to contract but does not exert force right away As the ventricles begin to contract, pressure rises since the valves are closed off

Ventricular Systole Cont Once left ventricular pressure rises above about 80 mmHg and right ventricular pressure rises above 20 mmHg, both semilunar valves open and blood is ejected Pressure continues to rise in the left ventricle to about 120 mmHg Rises to about 25-30 mmHg in the right ventricle At the end of this phase the T wave of the EKG marks the point of ventricular repolarization This is the point where they cannot contract

Relaxation Period Lasts about 0.2-0.4 seconds Marks the time when the atria and ventricles both relax SL valves close off since blood begins to flow back due to the lack of pressure from the ventricles As soon as the ventricular pressure falls below the atrial pressure the AV valves open up and the filling process begins over again At the end of the relaxation period the ventricles are about ¾ full and the next cycle begins One cycle lasts 0.8 sec in an average heart

Process Diagrams Step-by-Step Cardiac Cycle Process Diagrams Step-by-Step Copyright © 2007 by John Wiley & Sons, Inc.

R T (a) ECG P 1 Atrial depolarization 1 Q S 0.1 sec 0.3 sec 0.4 sec Atrial systole Ventricular systole Relaxation period 120 100 Dicrotic wave Aortic pressure 80 (b) Pressure (mmHg) Left ventricular pressure 60 40 Left atrial pressure 20 (c) Heart sounds S1 S2 S3 S4 130 (d) Volume in ventricle (mL) 60 (e) Phases of the cardiac cycle Atrial contraction Isovolumetric contraction Ventricular ejection Isovolumetric relaxation Ventricular filling Atrial contraction

R T (a) ECG P 1 Atrial depolarization 1 Q S 0.1 sec 0.3 sec 0.4 sec 2 Begin atrial systole Atrial systole Ventricular systole Relaxation period 120 100 Dicrotic wave Aortic pressure 80 (b) Pressure (mmHg) Left ventricular pressure 60 40 Left atrial pressure 20 2 (c) Heart sounds S1 S2 S3 S4 130 (d) Volume in ventricle (mL) 60 (e) Phases of the cardiac cycle Atrial contraction Isovolumetric contraction Ventricular ejection Isovolumetric relaxation Ventricular filling Atrial contraction

R T (a) ECG P 1 Atrial depolarization 1 Q S 0.1 sec Begin atrial systole 0.3 sec 0.4 sec 2 Atrial systole Ventricular systole Relaxation period 3 End (ventricular) diastolic volume 120 100 Dicrotic wave Aortic pressure 80 (b) Pressure (mmHg) Left ventricular pressure 60 40 Left atrial pressure 20 2 (c) Heart sounds S1 S2 S3 S4 3 End (ventricular) diastolic volume 130 (d) Volume in ventricle (mL) 60 (e) Phases of the cardiac cycle Atrial contraction Isovolumetric contraction Ventricular ejection Isovolumetric relaxation Ventricular filling Atrial contraction

R T (a) ECG P 1 Atrial depolarization Q 4 S 0.1 sec Begin atrial systole 0.3 sec 0.4 sec 2 Atrial systole Ventricular systole Relaxation period 3 End (ventricular) diastolic volume 120 Ventricular depolarization 100 Dicrotic wave 4 Aortic pressure 80 (b) Pressure (mmHg) Left ventricular pressure 60 40 Left atrial pressure 20 (c) Heart sounds S1 S2 S3 S4 End (ventricular) diastolic volume 130 (d) Volume in ventricle (mL) 60 (e) Phases of the cardiac cycle Atrial contraction Isovolumetric contraction Ventricular ejection Isovolumetric relaxation Ventricular filling Atrial contraction

R T (a) ECG P 1 Atrial depolarization Q 4 S 0.1 sec 2 Begin atrial systole 0.3 sec 0.4 sec Atrial systole Ventricular systole Relaxation period 3 End (ventricular) diastolic volume 120 Dicrotic wave 4 Ventricular depolarization 100 Aortic pressure 5 80 5 Isovolumetric contraction (b) Pressure (mmHg) Left ventricular pressure 60 40 Left atrial pressure 20 (c) Heart sounds S1 S2 S3 S4 End (ventricular) diastolic volume 130 (d) Volume in ventricle (mL) 60 (e) Phases of the cardiac cycle Atrial contraction Isovolumetric contraction Ventricular ejection Isovolumetric relaxation Ventricular filling Atrial contraction

R T (a) ECG P 1 Atrial depolarization Q 4 S 0.1 sec 0.3 sec 0.4 sec 2 Begin atrial systole Atrial systole Ventricular systole Relaxation period 3 End (ventricular) diastolic volume 120 Ventricular depolarization 100 Dicrotic wave 4 Aortic pressure 5 80 5 Isovolumetric contraction 6 (b) Pressure (mmHg) Left ventricular pressure 60 40 6 Begin ventricular ejection Left atrial pressure 20 (c) Heart sounds S1 S2 S3 S4 End (ventricular) diastolic volume 130 (d) Volume in ventricle (mL) 60 (e) Phases of the cardiac cycle Atrial contraction Isovolumetric contraction Ventricular ejection Isovolumetric relaxation Ventricular filling Atrial contraction

R T (a) ECG P 1 Atrial depolarization Q 4 S 0.1 sec 2 Begin atrial systole 0.3 sec 0.4 sec Atrial systole Ventricular systole Relaxation period 3 End (ventricular) diastolic volume 120 4 Ventricular depolarization 100 Dicrotic wave Aortic pressure 5 80 5 Isovolumetric contraction 6 (b) Pressure (mmHg) Left ventricular pressure 60 40 6 Begin ventricular ejection Left atrial pressure 20 7 End (ventricular) systolic volume (c) Heart sounds S1 S2 S3 S4 End (ventricular) diastolic volume 130 Stroke volume (d) Volume in ventricle (mL) 60 7 (e) Phases of the cardiac cycle Atrial contraction Isovolumetric contraction Ventricular ejection Isovolumetric relaxation Ventricular filling Atrial contraction

R T (a) ECG P Q 8 1 Atrial depolarization S 0.1 sec Begin atrial systole 0.3 sec 0.4 sec 2 Atrial systole Ventricular systole Relaxation period 3 End (ventricular) diastolic volume 120 Ventricular depolarization 100 Dicrotic wave 4 Aortic pressure 80 5 Isovolumetric contraction (b) Pressure (mmHg) Left ventricular pressure 60 40 6 Begin ventricular ejection Left atrial pressure 20 7 End (ventricular) systolic volume 8 Begin ventricular repolarization (c) Heart sounds S1 S2 S3 S4 End (ventricular) diastolic volume 130 Stroke volume (d) Volume in ventricle (mL) 60 (e) Phases of the cardiac cycle Atrial contraction Isovolumetric contraction Ventricular ejection Isovolumetric relaxation Ventricular filling Atrial contraction

R T (a) ECG P 1 Atrial depolarization Q 8 S 0.1 sec Begin atrial systole 0.3 sec 0.4 sec 2 Atrial systole Ventricular systole Relaxation period 3 End (ventricular) diastolic volume 120 9 Ventricular depolarization 100 Dicrotic wave 4 Aortic pressure 80 5 Isovolumetric contraction (b) Pressure (mmHg) Left ventricular pressure 60 6 Begin ventricular ejection 40 Left atrial pressure 20 7 End (ventricular) systolic volume 8 Begin ventricular repolarization (c) Heart sounds S1 S2 S3 S4 9 Isovolumetric relaxation End (ventricular) diastolic volume 130 Stroke volume (d) Volume in ventricle (mL) 60 (e) Phases of the cardiac cycle Atrial contraction Isovolumetric contraction Ventricular ejection Isovolumetric relaxation Ventricular filling Atrial contraction

R T (a) ECG P 8 1 Atrial depolarization Q S 0.1 sec 0.3 sec 0.4 sec 2 Begin atrial systole Atrial systole Ventricular systole Relaxation period 3 End (ventricular) diastolic volume 120 9 Ventricular depolarization 100 Dicrotic wave 4 Aortic pressure 80 5 Isovolumetric contraction (b) Pressure (mmHg) Left ventricular pressure 60 Begin ventricular ejection 40 6 Left atrial pressure 20 10 7 End (ventricular) systolic volume 8 Begin ventricular repolarization (c) Heart sounds S1 S2 S3 S4 9 Isovolumetric relaxation End (ventricular) diastolic volume 130 10 Ventricular filling Stroke volume (d) Volume in ventricle (mL) 60 (e) Phases of the cardiac cycle Atrial contraction Isovolumetric contraction Ventricular ejection Isovolumetric relaxation Ventricular filling Atrial contraction

R T (a) ECG P 1 Atrial depolarization 1 Q S 0.1 sec 0.3 sec 0.4 sec Atrial systole Ventricular systole Relaxation period 120 100 Dicrotic wave Aortic pressure 80 (b) Pressure (mmHg) Left ventricular pressure 60 40 Left atrial pressure 20 (c) Heart sounds S1 S2 S3 S4 130 (d) Volume in ventricle (mL) 60 (e) Phases of the cardiac cycle Atrial contraction Isovolumetric contraction Ventricular ejection Isovolumetric relaxation Ventricular filling Atrial contraction