ECG Recording Techniques Summer Progress-Computer Sciences and Applications-Project Presentation, Slides of Applications of Computer Sciences

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Summer Progress

Presentation

 Presentation Outline

 Introduction

 ECG recording techniques

 Features of the normal ECG

 Normal sinus rhythm

 Normal ECG in different leads

 Presentation Outline

 Myocardial Infarction

 Localization of MI

 PTB database

 Reading data into matlab

 ECG filtering

Summer Progress

Presentation

Introduction

 The amount of

positive deflection seen

on the ECG is directly

proportional to the

effective component

(projection) of the

current in the direction

of the positive

electrode

 An electrical current in the

direction away from the positive

end of a bipolar electrode causes a

negative deflection

 Current increase as the number of

MC cells increase

 The greater the current the greater

the negative deflection

Introduction

ECG Recording Techniques

 Standard 12 lead ECG

 Bipolar I,II,III

 Unipolar

aVR,aVL,aVF

 Precordial V1-V

 Orthogonal Leads

[Frank Leads]

X,Y,Z docsity.com

ECG Recording Techniques

 PR interval

 Duration 120-200ms

 QRS complex

 Duration 60-100ms  Axis: -30&deg to +90&deg  Normal Q waves: small (<40ms in duration and <2mm in height, in most leads)

Features of the normal ECG

 ST segment

 Usually isoelectric (flat) but may vary by approximately 1mm above or below

 T wave  Morphology: Upright in I, II, V3-V6. Inverted in aVR and V1. Maybe be upright, flat, or biphasic in other leads  Amplitude: Usually <6mm (limb leads) or <10mm (precordial leads)

Features of the normal ECG

Normal Sinus Rhythm

 SA Node

 Initiates electrical impulse  SA rhythm is the normal pacemaker [60- beats/min]

 A heart controlled by the SA node is said to be in normal sinus rhythm

 Atrial contraction

 AV node

 SA to AV [0.03 seconds]

 Every P-wave is followed by a QRS complex

 P-R interval is less than 0.2 seconds

Normal Sinus Rhythm

 SA node impulse origination and

Atrial depolarization (contd;)

 Onset of depolarization (SA node)  Impulse propagation to each cell  Forms P wave in the ECG  Positive in aVF, aVL, I,II,III  Negative in aVR

Normal Sinus Rhythm

 AV node depolarization and

activation of the bundle of His

Normal Sinus Rhythm

 Septal Depolarization

Normal Sinus Rhythm

 Septal Depolarization (cont)

 depolarize the ventricular septum  wave of depolarization splits into LBB and RBB  septal depolarization proceeds from left to right  small negative deflection in the ECG the septal Q  seen in the lead I, II, aVL, and V4-V

Normal Sinus Rhythm