Basic electrocardiograph and rheography.

Basic Principles of EKG Basic Principles of Electrophysiology Read a EKG tracing Normal EKG Pathology if any

Cellular Action Potential

Fig 1-10 Page 13

Cellular Basis of the EKG

Fig 4-8 Page 61 Cardiac Conduction System

Genesis of the EKG Tracing

Fig Pg 56

Fig Pg 64

Fig 4-6 Page 60

What are those “squigles”

EKG Nomenclature

You do need a patient

Leads for the EKG

Anatomical Correlation

Fig A Pg 58

Chest Electrode Placement

Bipolar Limb Leads

Unipolar (Augmented) Limb Leads

Augmented Limb Leads

Einthoven’s Triangle

Einthoven Axis

Cardiac Frontal Axis

Ringside Seats Do Matter

ECG Paper ECG paper is designed to move through the ECG machine at 25 mm per second. Each of the smallest boxes are l mm square making the darker lined boxes 5 mm square. Thus, at the usual rate of 25 mm/second flow of the paper through the machine, 5 large boxes pass through the machine per second or (5 x 60 seconds) 300 boxes per minute.ECG paper

Time Scale each l mm represents 0.04 seconds. The distance between the darker lined boxes in a horizontal direction represents 5 x 0.04 seconds or 0.2 seconds. Therefore, 25 small boxes (5 large boxes) pass through the machine every second. One large box (made up of 5 small boxes) equals 1/5 (0.20) second.

Voltage on the EKG Grid 0.5 mV 0.1 mV

“The Final Product”