8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 1/40
ANATOMY AND PHYSIOLOGY OFTHE CONDUCTION SYSTEM
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 2/40
Dream House
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 3/40
STAIRCASE
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 4/40
Hallway
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 5/40
Toilet
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 6/40
Bathtub
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 7/40
Dinning Room
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 8/40
Door
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 9/40
TOPIC OUTLINE
ANATOMY OF THE HEART
ELECTRICAL CONDUCTION SYSTEM
ACTION POTENTIAL
ECG COMPLEX
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 10/40
Your heart.
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 11/40
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 12/40
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 13/40
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 14/40
Heart Walls
ENDOCARDIUM
MYOCARDIUM
EPICARDIUM
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 15/40
PERICARDIUM
VISCERAL
PERICARDIAL
CAVITY
PARIETAL
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 16/40
CORONARY ARTERIES
Right Coronary Artery
Left Coronary Artery
Left AnteriorDescending Artery
Left Circumflex Artery
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 17/40
The Heart
It pumps blood Cardiac Output
±Amount of blood pumped by the heart per
minute
CO= SV x HR
± Stroke Volume- amount of blood pumped
by the heart per contraction
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 18/40
The Heart
Neural Control Autonomic Nervous
System
±
Excitability ±Rate of Pacemaker Discharge
±Speed of Conduction
±Sympathetic fibers
±Parasympathetic fibers
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 19/40
Electrical Conduction of the Heart
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 20/40
`SA Node
Dominant pacemaker
located in upper portion of right atrium
Intrinsic rate 60100 bpm.
`AV Node
Slows conduction, creating a slight delaybefore impulses reach ventricles.
Intrinsic rate 4060 bpm.
Conduction system
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 21/40
CONDUCTION SYSTEM
`Bundle of His
Transmits impulses to bundle branches.
Located below AV node.
`Purkinje fibers
Spreads impulses rapidly throughout
ventricular walls. Located at terminals of bundle branches.
Intrinsic rate 2040 bpm.
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 22/40
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 23/40
ELECTROLYTES IN CELLULAR
PHYSIOLOGY
ACTION POTENTIAL
±Electrical process that stimulates eachmuscle cell in the heart to contract
POTASSIUM
±Major cation inside the cell at rest
SODIUM AND CALCIUM
±Major cations outside the cell at rest
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 24/40
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 25/40
CARDIAC ACTION POTENTIAL
PHASE 4- movement of Ions while muscle
cells are at rest
PHASE 0 sodium and calcium enter the cell
± Stage of DEPOLARIZATION
±ATRIA- P WAVE ±VENTRICLES- QRS COMPLEX
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 26/40
CARDIAC ACTION POTENTIAL
PHASES 1, 2,3- repolarization phenomenon
± Restoration of polarity
± PHASES OF REPOLARIZATION
± PHASE 1- fast Na channels suddenly close»Slow Ca channel remains open
± PHASE 2-plateau phase; flow Ca is balance with K
»ST SEGMENT
± PHASE 3 Ca Channel close but K continues to leak
»T Wave
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 27/40
ACTION POTENTIAL
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 28/40
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 29/40
CARDIAC CYCLE
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 30/40
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 31/40
THE ECG COMPLEX
P WAVE
±Depolarization of atrial muscle cells
± First positive deflection
±Height- less than 3mm; Width 0.06-0.12
sec.
Q RS COMPLEX
±Depolarization of ventricular muscle cells
±Height- less than 25 mm; Width 0.06-0.10
sec.
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 32/40
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 33/40
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 34/40
ECG COMPLEX
PR INTERVAL
±Beginning of the P wave to the beginning of QRS complex
±Duration is 0.12-0.20 sec.
Q T INTERVAL
±Total time required for depolarization andrepolarization of the ventricles
±Duration is 0.35-0.45 sec.
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 35/40
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 36/40
ECG strip
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 37/40
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 38/40
Standard Limb leads
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 39/40
Augmented Limb Leads
8/7/2019 ANATOMY AND PHYSIOLOGY OF CONDUCTION SYSTEM
http://slidepdf.com/reader/full/anatomy-and-physiology-of-conduction-system 40/40
Chest lead placement
Top Related