Answered: Should Jhon expect any variation to the…

Biomedical Instrumentation Systems

1st Edition

ISBN:9781133478294

Author:Chatterjee

Publisher:Chatterjee

Chapter8: Defibrillators And Pacemakers

Section: Chapter Questions

Problem 1P

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A variety of ways to calculate heart rate from an ECG may be used. The quickest way to calculate heart rate on a rhythm strip is: Count the number of large squares between one R-R interval, and divide this number into 1500. Calculate the number of QRS complexes in 1 minute Count the number of R-R intervals in 6 seconds, and multiply by 10 Count the number of small squares between one R-R interval, and multiply this number by 300.
Define the term 'distributive shock' and briefly explain why two of the three types of distributive shock result in increased heart rate, whilst the third type results in decreased heart rate.
In an EKG reading: | the P wave corresponds to the AV node firing. the QRS complex corresponds to a time when ventricular pressure is greater than atrial pressure. When in sympathetic mode, the AV Bundle will be receiving impulses at a faster rate then when in parasympathetic mode. | The T wave represents the time when the SA node first fires. The P-R interval represents the delay that occurs when the AV Bundle transmits signals to the Purkinje fibers.
Define the terms P wave, PR interval, QRS complex QRS rate, and QRS rhythm?
I need to calculate the approximate heart rate based on the given ECG results, but I can't get how to determine the length of time between two consecutive R waves. What I see, it's one second between the two highest waves (I suppose they are R waves). But it means the heart rate should be 60 beats per minute, but there is no option for this answer. Teach me how to determine correctly the length of time between two consecutive R waves.
Autorhythmic cells in the SA node intrinsically fire at a rate of - 90 action potentials per minute. At rest, the heart rate is lowered primarily through modulation by: O Decreased delivery of acetylcholine and increased delivery of norepinephrine Increased delivery of acetylcholine and decreased delivery of norepinephrine Cardiac contractile cells Decreased delivery of acetylcholine and decreased delivery of norepinephrine Increased delivery of acetylcholine and increased delivery of norepinephrine O O O
what are the components of Echocardiogram? Please explain at your own words.
How does COPD correlate with left ventricular pressure and primary heart failure?briefly answer
If SA node (=natural pacemaker) firing rate is 100 potentials per minute, but resting heart rate of a person is 75bpm, what accounts for the difference? I
Will the P wave be visible if it occurs during the QRS wave? Explain your answer.
Which of these lists the parts of the heart's electrical circuit in the correct order?
Predict the potential effects of right-sided heart failure (failure of the right ventricle to pump adequately?

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Should Jhon expect any variation to the normal values of the heart rate knowing that the patient in scared?