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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 ...
Tom Teman's user avatar
2 votes
1 answer
73 views

ECG: vector perpendicular to lead axis and its pattern

I have come across a contradiction while learning about ECG. Some sources say that a biphasic deflection (two waves of same size but of opposite directions) is drawn on ECG tracing if the electrical ...
Mario Bedon's user avatar
2 votes
0 answers
40 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 ...
John Hon's user avatar
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2 votes
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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 ...
bobwiley's user avatar
2 votes
0 answers
31 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 ...
jaaq's user avatar
  • 121
1 vote
0 answers
15 views

On an ECG, do we take the J point to be the baseline or the TP segment?

I'm studying current of injuries and the diastolic current theory is explained as such: The ECG machine is programmed to keep the T-P segment at baseline with everything else on the strip moved up or ...
Filthyscrub's user avatar
1 vote
0 answers
63 views

ECG-Lead 1 vs Lead 2

I am new to this and I am trying to do some filtering on ECG signals. I am working on Lead I signals but they appear too noisy. However, Lead II singals appear significantly less noisy whilst having ...
makala's user avatar
  • 11
1 vote
0 answers
76 views

Estimation of QT interval when T and P waves overlap

On an ECG (EKG) machine, in a normal Sinus rhythum (with well distinguished T waves), the interval between the start of the QRS complex and the end of the T wave, (i.e. QT interval), can be estimated ...
user23811's user avatar
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1 vote
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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 ...
ayazasker's user avatar
1 vote
0 answers
46 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. ...
alexisicte's user avatar
1 vote
0 answers
24 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 ...
Van's user avatar
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Should we invert other ECG leads if aVR was positive?

I would like to seek your kind guidance in understanding the right way of solving this question. (for the context, so far we only covered normal ECG and axis deviation) The question displays all 12 ...
helplessstudent147's user avatar
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0 answers
45 views

Is this a P-wave on single-lead ECG

I am an engineer working on a project using ECGs. I am trying a few techniques and I was wondering whether the P-wave is still visible in the ECG after filtering it. The issue is that I believe the ...
makala's user avatar
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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 ...
Ηλεκτρολόγος Μηχανικός's user avatar