PHSL_ Cardiovascular Lab 6

pdf

School

University of Minnesota-Twin Cities *

*We aren’t endorsed by this school

Course

3701

Subject

Mechanical Engineering

Date

Dec 6, 2023

Type

pdf

Pages

3

Uploaded by sarah088888

Report
Cardiovascular Lab 6 Worksheet: 1. In your own words, what does the electrocardiogram represent It detects heart rate activity. Specifically electrical activity within the heart. 2. In your own words: define what a lead is and what does a lead provide on an ECG A lead is a sensor that detects potential differences in electrical activity. Two surface electrodes of opposite polarity that pick up electrical differences. 3. Why is AV nodal delay important and where is it represented on the ECG waveform? It creates a delay between the atrial depolarization and the ventricles to depolarize. This allows time for the atria to finish contracting before the ventricles contract. It is represented after the P wave and before the QRS segment. 4. Fill in the mechanical event to its corresponding electrical event: a. P wave: Atrial Depolarization b. Courses c. QRS Complex: Electrical impulse and Ventricular Depolarization d. T Wave: Ventricular Repolarization e. Between the T wave and next P wave: Ventricular Filling 5. Explain why you can or cannot see atrial RE_polarization on an ECG? It is a small change compared to the ventricular repolarization 6. Consider the following ECG taken from Lead II a. Estimate the heart rate from this ECG tracing. Include your calculation and units. 8 beats per 6 seconds. 8*10= 80 bpm.
7. Consider consecutive ECG waveforms (ECGs shown one after another): a. If the R-R intervals decrease what is happening to the heart rate? Heart rate increases b. If the R-R intervals increase what is happening to the heart rate? Heart rate decreases 8. Which lead is the most parallel to the mean ventricular axis (MVA)? And what would cause the MVA to move? Lead 2: Changes in body shape 9. What would be indicated if the P wave was missing? Be sure to include the electrical and mechanical events affected. A flat line. QRS Complexes would appear at random intervals. Atrial depolarization would not be consistent. 10. What would be indicated by a QRS complex that was large, wide and slow? Be sure to indicate what is happening at the molecular level as well as the level of the heart. Ventricular depolarization would be slow but large. Heart abnormality. Analysis: ● Note the differences in Lead II, Lead I, and Lead III – which one has the largest QRS complex? Lead II ● In which lead are you best able to identify P waves, QRS complexes and T waves? Lead II ● Are any of the leads producing downward deflections? If so, which one? Lead III ● Using the magnifying glass tool on the right side of your screen, enlarge a portion of the ECG trace. Use the highlighting tool to shade the area from one R wave to the next R wave.
○ What is the heart rate? 70 bpm ○ How long is the duration of one cardiac cycle? 0.817 seconds ○ What is the duration of the P-R interval? 0.075 seconds ● Did the size of the QRS complex change when the subject was in the standing position? If there was a change, discuss in your group why this might be? At the standing position the heart rate went up and the QRS complex also got larger. ● What is the effect of a few seconds of jogging on the ECG? Makes the lead easier to identify as the QRS complex got larger ● Did the size of the QRS complex change or did the heart rate change as the person breathed deeply or as the person held his/her breath? Again, if you observed changes, discuss in your group the explanation for these changes. The ECG showed that heart rate sped up slightly but the P waves were slightly farther away from the QRS complex. ● What happened when the subject squeezed each hand into a fist and squeezed the leg muscles? This is equivalent to doing an EMG on top of the ECG. Explain the results. The ECG displayed very close lines and it was near unable to read. Neurons are firing. In the contraction the action potential voltage electricity. The muscles are contracting, giving off voltage electricity.
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
  • Access to all documents
  • Unlimited textbook solutions
  • 24/7 expert homework help

Related Documents

MEC751 Project Milestone 2.pdf
Mec 721 Hardware Lab 1 (1).pdf
Composites Report.docx
DAD 220 Module Four Major Activity Database Documentation.docx
Chapter 2 Review Quiz.docx
02.10 _ Pitot-Static System – Test.pdf
Screenshot 2023-11-18 at 9.51.58 PM.png
Screenshot 2023-11-18 at 9.46.06 PM.png
Summer 2023 Saadatian Final Exam.pdf
ME2453 EX1.pdf
ME2543 Exam3.pdf
Summer 2023 Saadatian Exam #1.pdf
Recommended textbooks for you
Text book image
Automotive Technology: A Systems Approach (MindTa...
Mechanical Engineering
ISBN:9781133612315
Author:Jack Erjavec, Rob Thompson
Publisher:Cengage Learning
Text book image
Refrigeration and Air Conditioning Technology (Mi...
Mechanical Engineering
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:Cengage Learning
Text book image
Electrical Transformers and Rotating Machines
Mechanical Engineering
ISBN:9781305494817
Author:Stephen L. Herman
Publisher:Cengage Learning
Text book image
Precision Machining Technology (MindTap Course Li...
Mechanical Engineering
ISBN:9781285444543
Author:Peter J. Hoffman, Eric S. Hopewell, Brian Janes
Publisher:Cengage Learning
Text book image
Understanding Motor Controls
Mechanical Engineering
ISBN:9781337798686
Author:Stephen L. Herman
Publisher:Delmar Cengage Learning
SEE MORE TEXTBOOKS
Recommended textbooks for you
Text book image
Automotive Technology: A Systems Approach (MindTa...
Mechanical Engineering
ISBN:9781133612315
Author:Jack Erjavec, Rob Thompson
Publisher:Cengage Learning
Text book image
Refrigeration and Air Conditioning Technology (Mi...
Mechanical Engineering
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:Cengage Learning
Text book image
Electrical Transformers and Rotating Machines
Mechanical Engineering
ISBN:9781305494817
Author:Stephen L. Herman
Publisher:Cengage Learning
Text book image
Precision Machining Technology (MindTap Course Li...
Mechanical Engineering
ISBN:9781285444543
Author:Peter J. Hoffman, Eric S. Hopewell, Brian Janes
Publisher:Cengage Learning
Text book image
Understanding Motor Controls
Mechanical Engineering
ISBN:9781337798686
Author:Stephen L. Herman
Publisher:Delmar Cengage Learning
SEE MORE TEXTBOOKS