This document summarizes key aspects of cardiac electrophysiology and electrocardiography. It discusses the electrical properties and functions of different cardiac tissues, the roles of the sinoatrial node, atrioventricular node, and Purkinje fibers as pacemakers. It also describes the components of an electrocardiogram and how it provides information about heart rate, rhythm, and tissue health. Common conduction abnormalities and arrhythmias are outlined as well.
1.Bioelectric signals and their characteristics
2.Structure of heart
3.ECG Lead System Configuration
4.ECG Waveform
5.ECG Recording system – Block diagram
6.Analysis of ECG waveform
1.Bioelectric signals and their characteristics
2.Structure of heart
3.ECG Lead System Configuration
4.ECG Waveform
5.ECG Recording system – Block diagram
6.Analysis of ECG waveform
Slideshow is from the University of Michigan Medical School's M1 Cardiovascular / Respiratory sequence
View additional course materials on Open.Michigan:
openmi.ch/med-M1Cardio
Electrocardiography: is the recording of the electrical impulses that are generated in the heart. These impulses initiate the contraction of cardiac muscles.
An ECG (electrocardiogram) records the electrical activity of your heart at rest. It provides information about your heart rate and rhythm and shows if there is an enlargement of the heart due to high blood pressure (hypertension) or evidence of a previous heart attack (myocardial infarction).
Questions and Answers related to ECG and illustration. Short assignment with diagram and images
Slideshow is from the University of Michigan Medical School's M1 Cardiovascular / Respiratory sequence
View additional course materials on Open.Michigan:
openmi.ch/med-M1Cardio
Electrocardiography: is the recording of the electrical impulses that are generated in the heart. These impulses initiate the contraction of cardiac muscles.
An ECG (electrocardiogram) records the electrical activity of your heart at rest. It provides information about your heart rate and rhythm and shows if there is an enlargement of the heart due to high blood pressure (hypertension) or evidence of a previous heart attack (myocardial infarction).
Questions and Answers related to ECG and illustration. Short assignment with diagram and images
Electrocardiograhy (A topic in National Book Foundation Text Book for the Federal Board's Pre-Medical Students, up to their level for their Concepts and Understandings as well as the proper NOTES to have marks in Board's Exams). In'sha'Allah, they as well as Professors will Appreciate this Hectic Task of mine. It took 10 days to arrange and synchronize the material up to their Level of Understanding.
M.sc part. 1 seme 2 . This is topic are biochemistry
ECG are electro cardio graph this full from of ECG
And this topic related a heart function in human body
The topic is about heart related diseases and how it can be cured.what are the diseases and what are the treatments and methods. You should view it.it may be helpful to you people.
2. Electrical Properties of Different Cardiac Tissues From Table 20-3 Little effect ↑ strength of contraction I ca , I k , I na Expel blood from Ventricles Ventricular Muscle Little effect ↑ strength of contraction I ca , I k , I na Expel blood from Atria Atrial Muscle ↓ pacemaker rate ↑ pacemaker rate I ca , I k , I f, I na Tertiary Pacemaker Rapid conduction of AP Purkinje fibers ↓ conduction velocity and pacemaker rate ↑ conduction velocity and pacemaker rate I ca , I k , I f Secondary Pacemaker AV node ↓ conduction velocity and pacemaker rate ↑ conduction velocity and pacemaker rate I ca , I k , I f Primary Pacemaker SA Node Cholinergic Effects B-adrenergic Effects Major Currents Function Tissue Name
3. Electrical system of the heart Purkinje fibers Bundle of His Sinoatrial node Atrioventricular node 3 possible Pacemakers – Primary – Sinoatrial node, Secondary – Atrioventricular node Tertiary – Purkinje fibers
5. P wave – depolarization of atria QRS complex – depolarization of ventricular muscle T wave – repolarization of ventricular muscle *repolarization of atria lies under QRS The Electrocardiogram What information does the EKG give you? Fig. 20-6 rate, rhythm, tissue health
6. Two cell model of EKG activity Positive deflection Negative deflection isoelectric When wave of depolarization moves towards a positive electrode, the deflection is positive. Fig. 20-9
7. 6 limb leads – define electrical activity in frontal plane 6 precordial leads – define electrical activity in transverse plane Each lead is a single axis in one of the planes 12 Lead EKG The 3 augmented leads compare one limb electrode to the average of the other two. (aVR, aVL, aVF) Leads are made of a combination of electrodes that form imaginary lines in the body along which the electrical signals are measured. Fig. 20-7
8. Electrical axis of the heart is normally between -30 and 90 degrees. Einthoven’s Triangle (6 limb leads) Fig. 20-8
9. Willem Einthoven Nobel prize in 1924 for electrocardiogram (discovered in 1903)
11. What does the axis tell us? Left axis deviation (between -90 and -30 degrees) -Short and/or obese persons -parallels amount of conductance over tissue Right axis deviation (between 180 and 90 degrees) -Tall and thin persons -parallels amount of conductance over tissue
14. First degree block Second degree block Third degree block Normal WPW Conduction Arrhythmias
15. Re-entry – defect is a unidirectional block -Can cause continuous excitation called “circus movement” -Wave of depolarization travels in an endless circle Requirements 1) Closed conduction loop 2) A region of unidirectional block 3) Slow conduction of action potentials around the loop (to allow for ERP to pass)
16. Wolff-Parkinson-White Syndrome -Common example of accessory conduction pathway (Bundle of Kent) -A common route for a re-entry pathway -Often results in supraventricular tachycardia -Occurs in ~ 0.3-1% of population (Bundle of Kent) Delta wave
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18. - decreases amplitude or inversion of the T wave - increases amplitude of the U wave - prolongation of the Q-T interval - Increased amplitude of the P wave, prolongation of the P-R interval - Widening of the QRS complex HYPOKALEMIA