logging in or signing up Introduction To ECG aSGuest1029 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 8113 Category: Science & Tech.. License: All Rights Reserved Like it (6) Dislike it (0) Added: October 15, 2008 This Presentation is Public Favorites: 8 Presentation Description No description available. Comments Posting comment... By: rosemariegivero (14 month(s) ago) hi can I have your ppt presentation cause it can help me with my study about heart my email add is rosemariegivero@yahoo.com tnx. Saving..... Post Reply Close Saving..... Edit Comment Close By: smurni (18 month(s) ago) may I have your presentation??/thank you Saving..... Post Reply Close Saving..... Edit Comment Close By: drmanick (28 month(s) ago) hi friend, can i have your ppt, so that me and my friends benefit from it.. its very nice presentation easy to understand Saving..... Post Reply Close Saving..... Edit Comment Close By: azoz (33 month(s) ago) would you please sent me the ppt file it will help me a lot thanks Saving..... Post Reply Close Saving..... Edit Comment Close By: sravan09 (34 month(s) ago) hai can i have ur presentation. It will be very useful for me Saving..... Post Reply Close Saving..... Edit Comment Close loading.... See all Premium member Presentation Transcript Introduction to ECGs : 1 Introduction to ECGs EMS Professions Temple College Discussion Topics : 2 Discussion Topics ECG Monitoring Basics Standardized Methods & Devices Components & Measurements of the ECG Complex ECG Analysis ECG Monitoring : 3 ECG Monitoring ECG Monitoring : 4 ECG Monitoring Recording of Electrical Activity Uses Bipolar or Unipolar leads The ECG DOES NOT provide a recording or evaluation of Mechanical Activity!!! ECG Monitoring : 5 ECG Monitoring Bipolar Leads 1 positive and 1 negative electrode RA always negative LL always positive Traditional limb leads are examples of these Lead I Lead II Lead III Provide a view from a vertical plane ECG Monitoring : 6 ECG Monitoring Unipolar Leads 1 positive electrode 1 negative “reference point” calculated by using summation of 2 negative leads Augmented Limb Leads aVR, aVF, aVL vertical plane Precordial or Chest Leads V1-V6 horizontal plane ECG Monitoring : 7 ECG Monitoring Einthoven’s Triangle Each lead “looks” from a different perspective Can determine the direction of electrical impulses Upright electrical recording indicates electricity flowing towards the + electrode positive deflection Standardized Methods & Devices : 8 Standardized Methods & Devices Standardized Methods & Devices : 9 Standardized Methods & Devices ECG Paper Device Paper Speed Device Calibration Electrode Placement Variations Do Exist! Standardized Methods & Devices : 10 Standardized Methods & Devices ECG Graph Paper Vertical axis- voltage 1 small box = 1 mm = 0.1 mV Horizontal axis - time 1 small box = 1 mm = 0.04 sec. Every 5 lines (boxes) are bolded Horizontal axis - 1 and 3 sec marks Standardized Methods & Devices : 11 Standardized Methods & Devices ECG Paper Examples Vertical Axis No. of mm in 10 small boxes? No. of small boxes in 2 mm? Horizontal Axis No. of seconds in 5 small boxes? No. of small boxes in 0.2 second? No. of small boxes in 1 second? Standardized Methods & Devices : 12 Standardized Methods & Devices Paper Speed & Calibration Paper Speed - 25 mm/sec standard Calibration of Voltage is Automatic Both Speed and voltage calibration can be changed on most devices Standardized Methods & Devices : 13 Standardized Methods & Devices Electrode Placement Standardization improves accuracy of comparison ECGs 3 Lead and 12 Lead Placement are most common Assure good conduction gel Prep area with alcohol prep Avoid Bone Large muscles or hairy areas Limb vs. Chest placement Standardized Methods & Devices : 14 Standardized Methods & Devices Electrode Placement Poor placement or preparation Often results in artifact Stray energy from other sources can also lead to poor ECG tracings (noise) 60 cycle interference Components of the ECG : 15 Components of the ECG Components of the ECG Complex : 16 Components of the ECG Complex Components & Their Representation P, Q , R, S, T Waves PR Interval QRS Interval ST Segment Components of the ECG Complex : 17 Components of the ECG Complex P Wave first upward deflection represents atrial depolarization usually 0.10 seconds or less usually followed by QRS complex Components of the ECG Complex : 18 Components of the ECG Complex QRS Complex Composition of 3 Waves Q, R & S represents ventricular depolarization much variability usually < 0.12 sec Components of the ECG Complex : 19 Components of the ECG Complex Q Wave first negative deflection after P wave depolarization of septum not always seen Components of the ECG Complex : 20 Components of the ECG Complex R Wave first positive deflection following P or Q waves subsequent positive deflections are R’, R”, etc Components of the ECG Complex : 21 Components of the ECG Complex S Wave Negative deflection following R wave subsequent negative deflections are S’, S”, etc may be part of QS complex absent R wave in aberrant conduction Components of the ECG Complex : 22 Components of the ECG Complex PR Interval time impulse takes to move through atria and AV node from beginning of P wave to next deflection on baseline (beginning of QRS complex) normally 0.12 - 0.2 sec may be shorter with faster rates Components of the ECG Complex : 23 Components of the ECG Complex QRS Interval time impulse takes to depolarize ventricles from beginning of Q wave to beginning of ST segment usually < 0.12 sec Components of the ECG Complex : 24 Components of the ECG Complex J Point point where QRS complex returns to isoelectric line beginning of ST segment critical in measuring ST segment elevation Components of the ECG Complex : 25 Components of the ECG Complex ST Segment early repolarization of ventricles measured from J point to onset of T wave elevation or depression may indicate abnormality Components of the ECG Complex : 26 Components of the ECG Complex T Wave repolarization of ventricles concurrent with end of ventricular systole ECG Analysis : 27 ECG Analysis ECG Analysis : 28 ECG Analysis Rate Rhythm/Regularity QRS Complex P Waves Relationships & Measurements ECG Analysis : 29 ECG Analysis Ventricular Rate Triplicate method 300-150-100-75-60-50 R-R method divide 300 by # of large squares between consecutive R waves 6 Second method multiply # of R waves in a 6 second strip by 10 Rate meter unreliable!!! ECG Analysis : 30 ECG Analysis Rhythm Measure R-R intervals across strip Should find regular distance between R waves Classification Regular Irregular Regularly irregular Irregularly irregular ECG Analysis : 31 ECG Analysis QRS Complex Narrow < 0.12 seconds (3 small boxes) is normal indicates supraventricular origin (AV node or above) of pacemaker Wide > 0.12 seconds is wide indicates ventricular or supraventricular w/aberrant conduction ECG Analysis : 32 ECG Analysis P Waves Present? Do they all look alike? Regular interval Upright or inverted in Lead II? Upright = atria depolarized from top to bottom Inverted = atria depolarized from bottom to top ECG Analysis : 33 ECG Analysis Relationships/Measurements PR Interval Constant? Less than 0.20 seconds (1 large bx) P to QRS Relationship P wave before, during or after QRS? 1 P wave for each 1 QRS? Regular relationship? ECG Analysis : 34 ECG Analysis A monitoring lead can tell you: How often the myocardium is depolarizing How regular the depolarization is How long conduction takes in various areas of the heart The origin of the impulses that are depolarizing the myocardium ECG Analysis : 35 ECG Analysis A monitoring lead can not tell you: Presence or absence of a myocardial infarction Axis deviation Chamber enlargement Right vs. Left bundle branch blocks Quality of pumping action Whether the heart is beating!!! ECG Analysis : 36 ECG Analysis An ECG is a diagnostic tool, NOT a treatment No one was ever cured by an ECG!! Treat the PATIENT not the Monitor!!! You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
Introduction To ECG aSGuest1029 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 8113 Category: Science & Tech.. License: All Rights Reserved Like it (6) Dislike it (0) Added: October 15, 2008 This Presentation is Public Favorites: 8 Presentation Description No description available. Comments Posting comment... By: rosemariegivero (14 month(s) ago) hi can I have your ppt presentation cause it can help me with my study about heart my email add is rosemariegivero@yahoo.com tnx. Saving..... Post Reply Close Saving..... Edit Comment Close By: smurni (18 month(s) ago) may I have your presentation??/thank you Saving..... Post Reply Close Saving..... Edit Comment Close By: drmanick (28 month(s) ago) hi friend, can i have your ppt, so that me and my friends benefit from it.. its very nice presentation easy to understand Saving..... Post Reply Close Saving..... Edit Comment Close By: azoz (33 month(s) ago) would you please sent me the ppt file it will help me a lot thanks Saving..... Post Reply Close Saving..... Edit Comment Close By: sravan09 (34 month(s) ago) hai can i have ur presentation. It will be very useful for me Saving..... Post Reply Close Saving..... Edit Comment Close loading.... See all Premium member Presentation Transcript Introduction to ECGs : 1 Introduction to ECGs EMS Professions Temple College Discussion Topics : 2 Discussion Topics ECG Monitoring Basics Standardized Methods & Devices Components & Measurements of the ECG Complex ECG Analysis ECG Monitoring : 3 ECG Monitoring ECG Monitoring : 4 ECG Monitoring Recording of Electrical Activity Uses Bipolar or Unipolar leads The ECG DOES NOT provide a recording or evaluation of Mechanical Activity!!! ECG Monitoring : 5 ECG Monitoring Bipolar Leads 1 positive and 1 negative electrode RA always negative LL always positive Traditional limb leads are examples of these Lead I Lead II Lead III Provide a view from a vertical plane ECG Monitoring : 6 ECG Monitoring Unipolar Leads 1 positive electrode 1 negative “reference point” calculated by using summation of 2 negative leads Augmented Limb Leads aVR, aVF, aVL vertical plane Precordial or Chest Leads V1-V6 horizontal plane ECG Monitoring : 7 ECG Monitoring Einthoven’s Triangle Each lead “looks” from a different perspective Can determine the direction of electrical impulses Upright electrical recording indicates electricity flowing towards the + electrode positive deflection Standardized Methods & Devices : 8 Standardized Methods & Devices Standardized Methods & Devices : 9 Standardized Methods & Devices ECG Paper Device Paper Speed Device Calibration Electrode Placement Variations Do Exist! Standardized Methods & Devices : 10 Standardized Methods & Devices ECG Graph Paper Vertical axis- voltage 1 small box = 1 mm = 0.1 mV Horizontal axis - time 1 small box = 1 mm = 0.04 sec. Every 5 lines (boxes) are bolded Horizontal axis - 1 and 3 sec marks Standardized Methods & Devices : 11 Standardized Methods & Devices ECG Paper Examples Vertical Axis No. of mm in 10 small boxes? No. of small boxes in 2 mm? Horizontal Axis No. of seconds in 5 small boxes? No. of small boxes in 0.2 second? No. of small boxes in 1 second? Standardized Methods & Devices : 12 Standardized Methods & Devices Paper Speed & Calibration Paper Speed - 25 mm/sec standard Calibration of Voltage is Automatic Both Speed and voltage calibration can be changed on most devices Standardized Methods & Devices : 13 Standardized Methods & Devices Electrode Placement Standardization improves accuracy of comparison ECGs 3 Lead and 12 Lead Placement are most common Assure good conduction gel Prep area with alcohol prep Avoid Bone Large muscles or hairy areas Limb vs. Chest placement Standardized Methods & Devices : 14 Standardized Methods & Devices Electrode Placement Poor placement or preparation Often results in artifact Stray energy from other sources can also lead to poor ECG tracings (noise) 60 cycle interference Components of the ECG : 15 Components of the ECG Components of the ECG Complex : 16 Components of the ECG Complex Components & Their Representation P, Q , R, S, T Waves PR Interval QRS Interval ST Segment Components of the ECG Complex : 17 Components of the ECG Complex P Wave first upward deflection represents atrial depolarization usually 0.10 seconds or less usually followed by QRS complex Components of the ECG Complex : 18 Components of the ECG Complex QRS Complex Composition of 3 Waves Q, R & S represents ventricular depolarization much variability usually < 0.12 sec Components of the ECG Complex : 19 Components of the ECG Complex Q Wave first negative deflection after P wave depolarization of septum not always seen Components of the ECG Complex : 20 Components of the ECG Complex R Wave first positive deflection following P or Q waves subsequent positive deflections are R’, R”, etc Components of the ECG Complex : 21 Components of the ECG Complex S Wave Negative deflection following R wave subsequent negative deflections are S’, S”, etc may be part of QS complex absent R wave in aberrant conduction Components of the ECG Complex : 22 Components of the ECG Complex PR Interval time impulse takes to move through atria and AV node from beginning of P wave to next deflection on baseline (beginning of QRS complex) normally 0.12 - 0.2 sec may be shorter with faster rates Components of the ECG Complex : 23 Components of the ECG Complex QRS Interval time impulse takes to depolarize ventricles from beginning of Q wave to beginning of ST segment usually < 0.12 sec Components of the ECG Complex : 24 Components of the ECG Complex J Point point where QRS complex returns to isoelectric line beginning of ST segment critical in measuring ST segment elevation Components of the ECG Complex : 25 Components of the ECG Complex ST Segment early repolarization of ventricles measured from J point to onset of T wave elevation or depression may indicate abnormality Components of the ECG Complex : 26 Components of the ECG Complex T Wave repolarization of ventricles concurrent with end of ventricular systole ECG Analysis : 27 ECG Analysis ECG Analysis : 28 ECG Analysis Rate Rhythm/Regularity QRS Complex P Waves Relationships & Measurements ECG Analysis : 29 ECG Analysis Ventricular Rate Triplicate method 300-150-100-75-60-50 R-R method divide 300 by # of large squares between consecutive R waves 6 Second method multiply # of R waves in a 6 second strip by 10 Rate meter unreliable!!! ECG Analysis : 30 ECG Analysis Rhythm Measure R-R intervals across strip Should find regular distance between R waves Classification Regular Irregular Regularly irregular Irregularly irregular ECG Analysis : 31 ECG Analysis QRS Complex Narrow < 0.12 seconds (3 small boxes) is normal indicates supraventricular origin (AV node or above) of pacemaker Wide > 0.12 seconds is wide indicates ventricular or supraventricular w/aberrant conduction ECG Analysis : 32 ECG Analysis P Waves Present? Do they all look alike? Regular interval Upright or inverted in Lead II? Upright = atria depolarized from top to bottom Inverted = atria depolarized from bottom to top ECG Analysis : 33 ECG Analysis Relationships/Measurements PR Interval Constant? Less than 0.20 seconds (1 large bx) P to QRS Relationship P wave before, during or after QRS? 1 P wave for each 1 QRS? Regular relationship? ECG Analysis : 34 ECG Analysis A monitoring lead can tell you: How often the myocardium is depolarizing How regular the depolarization is How long conduction takes in various areas of the heart The origin of the impulses that are depolarizing the myocardium ECG Analysis : 35 ECG Analysis A monitoring lead can not tell you: Presence or absence of a myocardial infarction Axis deviation Chamber enlargement Right vs. Left bundle branch blocks Quality of pumping action Whether the heart is beating!!! ECG Analysis : 36 ECG Analysis An ECG is a diagnostic tool, NOT a treatment No one was ever cured by an ECG!! Treat the PATIENT not the Monitor!!!