Electrophysiology Overview

Electrophysiology

• Electrophysiology is the study of the electrical properties of biological cells and tissues.
• Related tools include ECG, EEG, and EMG.

Measurement of Voltage/Current

• Electrophysiology measures voltage or current changes, represented as oscillations.
• Measurements help with understanding the function of body parts.

What is an ECG?

• An ECG is a recording of the electrical activity generated by heart cells, which reaches the body's surface.

Depolarized/Repolarized Waves

• ECG intervals include PR/PQ (0.12-0.2 seconds), QRS (0.12 seconds), QT half of RR or >0.45, and RR about 0.8.

Specialized Excitatory and Conductive System

• The heart's electrical conduction system includes the sinus node, A-V node, A-V bundle, left and right bundle branches, and internodal pathways.

ECG Leads

• ECG leads include augmented limb leads (aVR, aVL, aVF).
• These are positioned on the limbs for recording.

Einthoven's Triangle

• Einthoven's triangle is a graphical representation of standard limb leads (I, II, III).
• Limb leads (RA, LA, LL) are positioned for standard ECG measurements.

Chest Leads (Pre-cordial Leads)

• Chest leads (V1-V6) are placed on the chest wall, following specific anatomical landmarks.

ECG Procedure

• ECG procedure is likely demonstrated in video 222.

Explore the fascinating field of electrophysiology, focusing on the electrical properties of biological cells and tissues. This quiz covers essential concepts such as ECG, voltage measurements, and the heart's specialized conduction system. Test your knowledge on ECG leads and heart wave patterns as well.