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-1
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0answers
19 views

What's the effect of hyperkalemia and hypokalemia on the cardiac excitability? [closed]

I was wondering what the effects of both hyperkalemia and hypokalemia are on the cardiac excitability. Does it affect the pacemaker cells too or just the normal cardiomyocytes?
5
votes
1answer
73 views

What does the 'V' stand for in ECG electrode names?

In electrocardiography, electrodes have the typical names of: RA (Right Arm) LA (Left Arm) RL (Right Leg) LL (Left Leg) V1, V2, V3, V4, V5 and V6 What does the V stand for? Is it perhaps from ...
1
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0answers
14 views

Electrocardiogram: Difference between Atrial Fibrillation and Atrial Flutter

I have been working on analyzing Electrocardiogram data. I have read several documents related to conditions of the Atria during fibrillation and flutter, the most lucid being that atria quiver with ...
0
votes
1answer
24 views

Electrocardiogram: Missed beats in presence of Ectopic beats or Premature Atrial/Ventricular Contraction beats

I have been working on analyzing Electrocardiogram data. So far, i have identified Ectopic beats and Premature Atrial/Ventricular Contraction beats. I am working on identifying Missed Beat in the ...
2
votes
1answer
79 views

What are the highest and lowest amplitude values in ECG for humans?

I'm currently trying to parse the records captured from an ECG device and display them on a mobile application. I am wondering what the highest and lowest possible amplitude values for ECGs are in ...
1
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0answers
17 views

Can I simply take the trend of heart rate amplitude to get breathing rate in an ECG?

I processed an ECG signal using findpeaks in Octave. Then, I plotted the amplitude of the "peaks" found by that function and got the followinge result (original ...
0
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0answers
16 views

EMG recording and muscular contraction

In many form of peripheral neuropathies the excitability of some neurons is changed and their conduction velocities are consequently altered.What are the effects that this might have on an EMG ...
0
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0answers
10 views

ECG cardiac monitoring

How is the signal observed from electrode and electrode impedance is affected if we clean one of the pair of Ag/AgCl cardiac electrode by scraping it with steel wool until it was shiny and bright
0
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0answers
5 views

How much potential from heart reaches the chest

I learn about the ECG waveform of heart potential.How much voltage will actually reach our skin which is developed in the heart(from Sinoatrial node).What will be the approximate voltage range when it ...
3
votes
1answer
106 views

Can an electrocardiogram be recorded with a single electrode?

Is it possible to do an electrocardiogram with one electrode? Or is it neccesary to have multiple electrodes? I do not understand much about EKG, so I am sorry if this question sounds naive.
1
vote
1answer
368 views

Why is Electrical Cardioversion contraindicated in AF and Digitalis Poisoning?

I am thinking why electrical cardioversion is contraindicated in atrial fibrillation with digitalis toxicity/poisoning. Cardiac digitalis is also called digoxin and cardiac glycoside. It is ...
4
votes
0answers
23 views

Non-cumbersome respiration sensor for sleep study?

I'm working on a project where I collect ECG signal from multiple volunteers, derive ECG derived respiration(EDR) from the timestamped ECG signal and calculate the cross correlation between EDR and ...
3
votes
1answer
157 views

Explanation of ECG in MI using an electrostatic model

I found a paper presenting an electrostatic model to explain the ECG recorded in various leads. This model essentially calls for considering the depolarization wavefront to be the major contributing ...
6
votes
2answers
257 views

How to analyse an ECG?

I have a project about extracting features from a homemade ECG. I need the PQRST points from the signal of the heart beat. The ECG I'm using has 3 electrodes that attach to the chest. The problem is ...
2
votes
1answer
1k views

How long do the periods of systole and diastole last?

The background to this is i'm doing some work using ECGs for an animation of the heart and i'm having trouble defining the end points of these periods, particularly diastole. Currently, the only ...
5
votes
1answer
130 views

Normal ECG/EKG Measurement?

I'm getting started using ECG using a 3 lead system by iWorx. I have place the leads on my two wrists and the ground on my ankle and have recorded some data into the provided LabScribe 3 software ...
2
votes
0answers
36 views

Neural correlates of the function of the cardiovascular system?

Are there any known neural correlates of the function of the cardiovascular system? I'm looking for research results that use standard brain imaging techniques (e.g. electroencephalography, ...
1
vote
1answer
29 views

Any databases with AAMI ECG and ECHO?

There is no AAMI 12-lead ECG databases available online. All of them have problems. I and my friends finally finalised our tests with St Petersburg. It is not AAMI. So the next step is to search ...
0
votes
2answers
179 views

What is the name of the condition where no pacemaker cells are active in the heart for a short-time?

Assume that the heart is beating, but no pacemaker cells are working for at least 15 seconds. This would be a very long compensatory pause if extrasystole started it. There may be some low frequent ...
2
votes
3answers
212 views

To get Standard ECG from PhysioNet?

I am trying to get standard ECG by using PhysioNet's ATM with parameters but I get It should be something like How can you get complete standard 12-lead ECG out of Physionet database?
5
votes
3answers
782 views

How does strength of a pulse related to EKG(ECG)?

There are variabilities in the heart rate as well as strength of heartbeats. I want to know if one can predict which heartbeat will be strong or weak based on the corresponding EKG/ECG signal. I am ...
3
votes
2answers
263 views

What is atrial fibrillation? [closed]

I am wondering exactly what a-fib is (causes and symptoms). I would really appreciate having a sample of an EKG with it (because in my limited research, I have found it nearly impossible to find just ...
1
vote
0answers
50 views

What are the mechanisms of disabling extrinsic control of heart?

I started this thread by thinking this question but I developed it further below What is the mechanism maintaining refractory period of pacemakers? My conjecture is that the mechanism is the ...
1
vote
0answers
41 views

Which reflex arcs work in Heart with extrasystoles?

I am researching what is triggering the extrasystoles - initial idea from this thread about Which ionic channels of Pacemakers can work in very low frequencies in extrasystole? I am interested in the ...
1
vote
1answer
36 views

Which ionic channels of Pacemakers can work in very low frequencies in extrasystole?

At frequency 0-3 Hz. Like computer processors which can work at low frequencies and controlling under- and overvoltage. Normal most significant channels are Ca2+ and K+ that are changing. However, I ...
1
vote
2answers
166 views

Is Sinus node conduction necessary for heart beating?

Assume a patient with previous cardial infaction which SA node not possible to activate action potential anymore. However, SA trying to beat unsuccessfully repeatedly waisting energy. Therefore, I ...
3
votes
1answer
160 views

How does sepsis affect heart function?

I have intuition that sepsis with infection can cause: spastic functioning of heart during systole heart working spontaneously in snatches during systole atrial fibrillation first contraction of ...
0
votes
1answer
76 views

Normal position of Electrical axis only in the III lead?

I found this sentence in my notes which is not exact enough: Electrical axes Excitatory processes have definite direction and magnitude and could therefore be represented as vectors. At ...
6
votes
1answer
224 views

Is a raised baseline between T and QRS normal in any ECG lead?

Here are excerpts from an unknown ECG lead. I find it weird that the "baseline" changes after the T wave and doesn't return until after the following QRS complex. Is that normal/expected for any lead? ...