Questions tagged [electrocardiogram]

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PR depressions on ECG when a patient has pericarditis

Can someone please explain why PR depressions are seen on an ECG when a patient has pericarditis? That is, from an electrophysiological perspective: What are the exact changes on the cell membrane ...
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0answers
34 views

Is the voltage at the heart the same as in limbs for ECGs?

When doing an ECG we measure the electrical voltage between two points on a person's skin (for example for Lead II it's right arm and left leg). I am confused as to how the heart's potential ...
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52 views

Should people with tachycardia avoid choline supplements?

After doing some brief research online it appears choline can have an effect on the electrical system of the heart, there are several medical papers online that discuss this topic, however I'm not ...
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0answers
16 views

What would the graph look like if the electrodes were non-equidistant from the depolarization wave?

Hypothetically speaking using the diagram above. If the negative electrode was very far away from this cardiomyocyte and the positive electrode was right next to it. What would the voltage graph look ...
2
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1answer
43 views

Positive deflection of an ECG

I understand that the voltage will be positive as measured by the ECG but I was wondering why the voltage reaches a maximum exactly at the midpoint. Is there a physiological reason (like sodium ...
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1answer
39 views

4 Electrode vs 5 Electrode ECG [closed]

I see that in a 4 electrode ECG (LA, RA, LL, RL) we can measure upto 6 Leads (LeadI, LeadII, LeadIII, AvR, AvL, AvF). What increase in value does adding an additional chest electrode like V2 provide? ...
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0answers
28 views

Looking for an ECG anomaly detection tool

In a few months I will be conducting a study where we take participents ECGs and try to measure stress levels from that using machine learning. I am also involved in pre-processing the data, meaning ...
2
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0answers
74 views

Does a wave of depolarization towards a positive electrode always result in positive deflection on ECG? [closed]

Pretty much what the text says. For the sake of simplicity let's imagine we have this scenario here: https://www.google.com/search?q=ecg+guyton+and+hall&tbm=isch&ved=...
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0answers
15 views

Standards for Electrocardiography and Photoplethysmography

Electrocardiography and Photoplethysmography are two techniques/devices that are commonly used to measure heart rate. My question is, clinically speaking, what are the standards these devices must ...
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0answers
45 views

How wrist wearables count breaths?

I am doing a research about wrist wearables in order to understand how they work. They can be used to measure stress levels, just like pupillometry, skin conductance and other related measures can be. ...
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1answer
183 views

Please say what my ecg means [closed]

Please say is there any serious issue .really worried.My report says 95bpm and otherwise normal ecg.
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0answers
96 views

What benefits for more EKG leads?

It seems that the 12-lead EKG is the gold standard for diagnosing many heart problems, but they're limited to fairly short samples (e.g. 30 minutes). Its possible to send a patient home for several ...
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0answers
20 views

What is the significance of the right lower node in a 12-lead electrocardiogram placement?

Given this EKG limb leads image, I noticed that the function of the right leg node in a 12-lead ecg/ekg is missing. In an actual placement I know this is present. So I need to ask, what is the ...
2
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1answer
159 views

What heart condition(s) cause tingling and lightheadedness that are NOT caught by an ECG?

Please note: A lot of things cause tingling in the face + extremities ("neuropathy") as well as lightheadedness, but in this question, I'm only interested in potential heart conditions, or anything ...