ECG

avatar
Created by
sunny ʕ •ᴥ•ʔ

Cards (31)

  • Atrial depolarization represents P wave
  • T wave represents ventricular repolarization
  • Ventricular depolarization is QRS complex
  • Cardiac cells are Sodium, Potassium, Calcium and Chloride ions
  • Sinoatrial node (SA) initiates the heartbeat by generating an electrical impulse that spreads through the atria.
  • Purkinje fibers carry the signal throughout the ventricles, causing them to contract simultaneously.
  • The Atrioventricular Node (AVN) receives the signal from the SA node and slows it down to allow time for blood to flow into the ventricles.
  • Purkinje fibers conduct the electrical impulses rapidly throughout the ventricles, causing them to contract simultaneously.
  • Phase 0 - rapid depolarization by the influx of Na ions
  • Phase 1 - repolarization due to K+ channels opening
  • Phase 2 - plateau phase where there is no change in membrane potential
  • Phase 2 - plateau phase where Ca2+ enters the cell via L-type calcium channels
  • Phase 3 - slow repolarization as K+ channels open again
  • Phase 4 - resting state with negative charge inside the cell
  • Phase 4 - resting membrane potential is reached when all ion channels are closed
  • Phase 1 - early fast repolarization
  • Phase 2 - maintained by influx of Calcium and Potassium ion
  • Phase 4 - resting membrane potential ; diastolic
  • Neutral - Right leg
  • Lead I - Right arm to Left arm
  • Lead II - Right Arm to Left Leg
  • Lead III - Left arm to Left leg
  • Augmented Unipolar Lead (aVR, AVL, AVF) - A unipolar lead that is augmented with an additional electrode placed on the chest wall.
  • Unipolar leads include V1-V6 and Augmented Unipolar Leads (aVR, AVL, AVF).
  • V1 and V2 - mostly negative
  • V4 - V6 - mostly positive
  • Lead II, III, AVR, AVF are located in inferior wall of the heart that receives blood in Right Coronary Artery
  • Lead I, AVL, V5 and V6 are located in lateral part of the heart that receives blood from Left Circumflex Artery
  • V1 and V2 are located in septal that receives blood from Left Anterior Descending Artery
  • V3 and V4 are located in anterior part that receive blood from Left Anterior Descending Artery
  • There are 12- Lead ECG