cadiovascular system-1 - ju...
TRANSCRIPT
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Cadiovascular System-1
Faisal I. Mohammed, MD, PhD
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University of Jordan
School of Medicine. Cardiovascular Physiology
Medical Students
Fall 2017-2018
Textbook: Textbook of Medical Physiology
By: Arthur C. Guyton & John E. Hall 12th 2011 or 13th Edition 2016
_______________________________________________________________________________
Lecture Topics Guyton 12th Guyton 13th
1. Introduction 57-69, 101-104 61-70,109-112
2. Cardiac mm. Physiology 101-104 109-112
3. Conduction System of the heart 115-120 123-129
4. Electrocardiography 121-127 131-137
5. Electrocardiography 129-136 139-148
6. Electrocardiography 143-153 155-161
7. Electrocardiography
8. Heart as a pump and cardiac cycle 104-113 113-122
9. Heart as a pump and cardiac cycle
10. Heart as a pump and cardiac cycle
11. Cardiac output and venous return 229-241 245-258
12. Cardiac output and venous return
13. Cardiac output and venous return
14. Circulation / systemic 157-175 169-188
15. Circulation / Haemodynamics
16. Arterial System/Regulation of
arterial blood pressure 201-211 215-225
17. Arterial System/ Regulationof ABP. 213-228 227-243
18. Blood flow / Tissues and is control 191-200 203-213
19. Special circulation(coronary 243-253 259-269
Pulmonary, skeletal muscle)
Optional Readings:
1. Physiology , latest edition , by : Berne and Levy last edition
2. Physiological Basis of Medical Practice, twelfth edition , by : John B. West 1990.
3. Human physiology from cells to systems, latest edition, by: Lauralee Sherwood. Last edition
FAISAL I. MOHAMMED. MD, PhD
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University of Jordan
School of Medicine, Cardiovascular Physiology
Medical Students
FALL 2017-2018
Textbook: Textbook of Medical Physiology
By: Arthur C. Guyton & John E. Hall 12th Edition 2011
___________________________________________________________________________
Lecture Topics Guyton11th Guyton 12th
1. Introduction 57-71,103-106 57-69, 101-104
2. Cardiac mm. Physiology 103-106 101-104
3. Conduction System of the heart 116-121 115-120
4. Electrocardiography 123-130 121-127
5. Electrocardiography 131-138 129-136
6. Electrocardiography 147-157 143-153
7. Electrocardiography
8. Heart as a pump and cardiac cycle 106-115 104-113
9. Heart as a pump and cardiac cycle
10.. Heart as a pump and cardiac cycle
11. Cardiac output and venous return 232-245 229-241
12. Cardiac output and venous return
13. Cardiac output and venous return
14. Circulation / systemic 161-163 157-158, 168-175
15. Circulation / Haemodynamics 164-180 159-166, 167-168
16. Arterial System/Regulation of
arterial blood pressure 204-215 201-211
17. Arterial System/ Regulation of ABP. 216-231 213-228
18. Blood flow / Tissues and is control 195-203 191-200
19. Special circulations (coronary 246-253 243-253
Muscle blood flow and exercise
Optional Readings:
1. Physiology , latest edition , by : Berne and Levy last edition
2. Physiological Basis of Medical Practice, twelfth edition , by : John B. West
1990.
3. Human physiology from cells to systems, latest edition, by: Lauralee
Sherwood. Last edition
FAISAL I. MOHAMMED. MD, PhD
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Clinical Problem
A 54 years old man seen in the cardiology clinic complaining of severe weakness, fatigue, dry cough, weight gain and difficulty in breathing. He feels severe shortness of breath while walking up stairs of his second floor apartment. He still complains of lesser severity of symptoms at rest. He states he often awakens at night feeling like he was suffocating. He is now sleeping with three pillows under his head. Lately he has taken to fall asleep while he is sitting watching T.V. He also complains of having to urinate 3-4 times per night. He was hospitalized with heart problem two months ago and was told that the efficiency of his heart is less than 30% and he needs ?? and has to wait until??. On examination his weight is 95Kg, height is 165 cm, blood pressure was 140/85 mmHg, his heart rate 90 beats/min and regular, his resp. rate is 28/min and labored.
Auscultation of the heart reveals abnormal heart sounds
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Objectives:
Introduction to the CVS physiology
Review the anatomy of the CVS.
List the functions of the CVS
Comprehend the pump nature of the heart
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Cardiovascular
System Anatomy
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History of cardiac Transplant
In 1967, Christiaan Barnard in Cape Town, South Africa transplanted the first Human Heart removed from a 25-year-old woman who had died following an auto accident and placed it in the chest of Louis Washkansky, a 55-year-old man dying of heart damage. The patient survived for 18 days. The problem was Rejection- Cyclosporine –immunosuppressant -decreased that.
In 1984, the world's first successful pediatric heart transplant was performed at Columbia on a four-year-old boy. He received a second transplant in 1989 and continues to live a productive life today.
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History of cardiac Transplant…cont
In 1984, in Linda Loma, California, Leonard Bailey, implanted a baboon heart into a 12-day-old girl, she survived for twenty days.
In 1982 in University of Utah, the first Total Artificial Heart was implanted in the chest a dentist Barney Clark by William DeVries. Clark survived for 112 days-The problem was blood clotting.
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Anatomy of the heart
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Anatomy of the heart
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Cardiac valves
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Cardiac
valves
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Cardiac Valves
Open and Close
Passively
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Importance of
Chordae Tendineae
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Importance of
Chordae Tendineae
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Functional Anatomy of the Heart
Valves
Function is to prevent backflow
Atrioventricular Valves
Prevent backflow to the atria
Prolapse is prevented by the chordae
tendinae
Tensioned by the papillary
muscles
Semilunar Valves
Prevent backflow into ventricles
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Movement of blood in the heart
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Cardiac Muscle
Physiology
Faisal Mohammed, MD, PhD
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Objectives:
By The end of this lecture students should be able to:
Distinguish the cardiac muscle cell microstructure
Describe cardiac muscle action potential
Point out the functional importance of the action
potential
Follow the cardiac muscle mechanism of contraction
Delineate cardiac muscle energy sources
Outline the intracellular calcium homeostasis
Explain the relationship between muscle length and
tension of cardiac muscle (Frank-Starling law of the
heart)
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Cardiac Muscle Vs Skeletal Muscle
Syncytium structure
Gap Junction (electrical coupling) low resistance
area
Poorly developed Sarcoplasmic reticulum (SR)
Transverse (T)Tubule on Z-line (i.e.One T-tubule
per sarcomere)
Rich in mitochondria
Low in nuclei
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Permeability Changes and Ionic Fluxes During
an Action Potential (skeletal Muscle)
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0
1 2
3
4
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The Action Potential in Skeletal and Cardiac
Muscle
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(activation gate) m Gate
(inactivation gate) h Gate
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PHASE 0 OF THE FAST FIBER ACTION
POTENTIAL
h
m
Na+
-90mv
A
Na+
m m h
-65mv
B
m h
Na+
0mv
C m h
Na+
D +20mv
Na+
m h
+30mv E
Chemical
Gradient
Electrical
Gradient
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Mechanism of Cardiac Muscle Excitation, Contraction & Relaxation
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Intracellular Calcium Homeostasis…1
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Intracellular Calcium Homeostasis…1
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Intracellular Calcium Homeostasis…2
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EFFECTS OF Ca++ CHANNEL BLOCKERS AND
THE CARDIAC CELL ACTION POTENTIAL
DILTIAZEM
10 uMol/L
30 uMol/L 10
30
10
FO
RC
E
TIME
CONTROL
CONTROL
30 40
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Cardiac Muscle action potential Vs.
Skeletal Muscle
Phase 0 –Depolarization phase (Na+ influx)
Phase 1 partial repolarization (Not in
skeletal)
Phase 2 Plateau (depolarization not in
skeletal) slow calcium channels
Phase 3 fast repolarization phase (K+ efflux
Phase 4 resting membrane potential
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2
3
4
1
0
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The Action Potential in Skeletal and
Cardiac Muscle
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Cardiac Muscle contraction Vs. Skeletal
Muscle
Sliding filament hypothesis
No tetany (Long refractory period because
of plateau)
Fatty acids main source of energy unlike
skeletal muscle (Anaerobic and Aerobic)
Attachment and detachment cycle and ATP
dependence is the same
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Length-Tension Relation for Skeletal Muscle
Active tension cannot be
measured directly
What can be measured?
(1) passive tension - tension
required to extend a resting
muscle
(2) total tension - active
tension and passive combined
Active is calculated from 1 & 2
(AT = TT – PT)
Note that active tension falls away
linearly with increasing length Length (proportion of resting length)
1.0 2.0 0
50
100
active tension
passive tension
total tension
Normal operating
range
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Isometric Contraction
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SERIES ELASTIC
ELEMENTS
CONTRACTILE
COMPONENT
(ACTIVE TENSION)
PARALLEL ELASTIC
ELEMENTS
(PASSIVE TENSION)
TOTAL
TENSION
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Cardiac Muscle length-tension
relationship
Cardiac muscle works at much less than its
maximum length in contrast to skeletal
Total, Active and Passive length-tension
relationship differ
Frank-Starling law of the heart
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Thank You
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