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