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Questions tagged [heart]

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Heart Rate Variability and Morbidity/Mortality [closed]

My Apple watch measures my Heart Rate Variability every 4 hours automatically and each time reports the HRV in milliseconds. They define HRV as 1 standard deviation of the all the R-R intervals during ...
BobE's user avatar
  • 720
5 votes
2 answers
77 views

How common is tachycardia as a symptom of COVID-19?

How common is tachycardia as a symptom of current COVID-19 infection? I have found quite a bit of information about tachycardia after COVID, such as this paper and this Cleveland Clinic article, but ...
Someone's user avatar
  • 153
1 vote
2 answers
211 views

How does blood flow change between systolic and diastolic phases?

Summary What is the change in flow between systolic and diastolic phases specifically in the muscular arteries? There is a lot of information on how pressure changes between these phases (see graph) ...
Luke Hamilton's user avatar
0 votes
0 answers
26 views

Pressure volume curve; Is it wrong Ea?

This is a continuation of the following question; Pressure volume curve; Is it wrong ESPVR? In the pressure volume curve, if my understanding is correct, Ea is obtained by the following diagram (Refer ...
Blue Various's user avatar
0 votes
1 answer
45 views

Pressure volume curve; Is it wrong ESPVR?

ESPVR is a straight line passing through the upper left corner point of the pressure volume curve and such that the x-intercept is the dead volume of the ventricle; as far as this definition is ...
Blue Various's user avatar
0 votes
1 answer
36 views

How to determine the "argument" of the electrical axis of the ECG from aVF & VI

This question is a continuation of the following question; Is the definition of aVF consistent with Novosel’s formula? Unfortunately, the article at the following URL is written in Japanese, but its ...
Blue Various's user avatar
0 votes
1 answer
79 views

Is the definition of aVF consistent with Novosel’s formula?

"In regards to the electrocardiogram, there is often a Statement made that, 'The a' in aVF means 'augmented' by a factor of 1.5 for sensitivity adjustment. If the above statement is true, ...
Blue Various's user avatar
3 votes
1 answer
39 views

Why does carcinoid syndrome affect the right heart valves more than the left ones?

Carcinoid syndrome results from the release of various peptides and amines (especially serotonin) from neuroendocrine tumours (NET). These factors can elicit immune responses on various tissues, ...
Chris's user avatar
  • 3,414
8 votes
2 answers
121 views

How is adding up action potentials equivalent to measuring the direction of depolarization vectors?

An ECG of the heart measured from lead II looks like this: I have seen two ways of arriving at this image, the first is by considering the depolarization and the repolarization vectors and their ...
Cosmic Dust's user avatar
-2 votes
1 answer
59 views

Difference between strength and hypertrophy?

Doctors tell us to do lots of cardio exercise to "strengthen" the heart. Then some people get hypertrophy (another form of heart muscle growth) and it's considered "abnormal" (even ...
personal_cloud's user avatar
5 votes
1 answer
86 views

Why do calcium channel blockers have an adverse effect of edema but Beta Blockers do not cause edema as a side effect?

My pharmacology professor glossed over the mechanism that causes edema besides briefly discussing after/preload. If Calcium channel blockers and beta blockers both are negative ionotropes then why isn'...
Justin Edward's user avatar
1 vote
0 answers
128 views

EKG reading question [closed]

Can someone tell me what "ETRSR1-RSR' in V1 or V2, right VCD or RVH-QRS area positive & R' V1/V2 " means? In other comments it also said "otherwise normal EKG"
Ashely Cox's user avatar
2 votes
0 answers
25 views

What other function does PCSK9 have, other than LDL cholesterol control? [closed]

I am trying to understand if PCSK9 has other functions in the body, other than the one mentioned in the question title. I know it can be found in different tissues, but I can't find anything about ...
user141154's user avatar
0 votes
0 answers
34 views

What if our hearts didn’t pulse?

Let’s say we used an electric pump that’s smart enough to adjust the blood flow according to the needs of the body. What would be the effects on our organs? Would we survive without the beats? I just ...
DeepBlue's user avatar
4 votes
0 answers
43 views

How does your heart heal

My understanding is that muscles heal primarily while resting. When you lift heavy things you cause small tears in the muscle then while resting and heal back stronger (I'm assuming that's how it ...
Diesel's user avatar
  • 141
1 vote
0 answers
21 views

Cardiac events/Myocardial infarction from 1 clinic or 1 large city daily data

Requesting help in finding a DAILY data about cardiac events/myocardial infarction from 1 clinic or 1 large city, i.e. day by day number of events for at least a month. It is very easy to find this ...
Kostya's user avatar
  • 11
3 votes
1 answer
280 views

How does a prosthetic heart valve "burst"?

I have a friend who's father died suddenly, and the coroner described the cause as his prosthetic heart valve "bursting." Can someone illustrate in words what that means, and would heart ...
Chris Fedele's user avatar
1 vote
1 answer
53 views

How do I measure my resting heart rate?

I measured my sitting down, relaxed, not moving heart rate, which is around 65-80BPM. If I do the same measurement laying down, it's anywhere from 50-65BPM. While asleep, it dips into the 40s. The ...
eddiewastaken's user avatar
2 votes
0 answers
106 views

Bulbus aortae is a part of aortic root, then where are the two measurements taken?

I would like to clarify my understanding because anatomy atlases do not provide me an explanation. As far as I know, the aortic bulbus is a part (the widest, the sinuses of Valsalva) of the aortic ...
John V's user avatar
  • 71
-1 votes
1 answer
53 views

Could an increase in heart strength result in an increase in systolic blood pressure? [closed]

If someone begins intense cardio training and develops their heart muscle, it seems to me that the increase in volume of blood that the heart can pump with every beat might manifest as a higher ...
Nathan Wailes's user avatar
0 votes
1 answer
81 views

Is chronic fatigue syndrome a symptom of myocarditis?

In the past few weeks I've seen news that Covid-19 infection is often followed by myocarditis or effects similar to chronic fatigue syndrome (though it is simply too soon to call it CFS). Because both ...
Mike Serfas's user avatar
1 vote
0 answers
21 views

How to differentiate Split S2 from Mitral valve prolapse murmur?

If history is not available or doesn't gives a clue about the pathology, is it still possible to tell whether it is MVP or Split S2 due to pulmonary valve problems? Both split S2 and MVP's murmur( the ...
Physicsapproval's user avatar
2 votes
1 answer
213 views

How can I take blood pressure into the cardiac output formula?

I wanted to know if there is some kind of formula that can help me calculate the cardiac output. So, lets say we have a standing person. The StrokVolume should be around 100 cm2 for the average adult, ...
Maritn Ge's user avatar
  • 135
3 votes
1 answer
2k views

Why do semilunar valves not need tendinae but atrioventricular valves do?

Inside the heart the atrioventricular valves (AV) have chordae tendineae to prevent the backflow of blood into the atrium when the ventricle contracts. Since the AV and semilunar valves are ...
John Hon's user avatar
  • 205
1 vote
1 answer
53 views

Myocardial Ischemic Contractile Failure & Potassium

From my understanding of myocardial ischemic contractile failure, ischemia causes increased extracellular K+ concentration due to the ATP-sensitive K+ channels opening (as they need ATP to stay closed)...
Vacuum's user avatar
  • 13
0 votes
1 answer
1k views

Why squatting leads to decrease in MVP murmur

Mvp = mitral valve prolapse Hcm = hypertrophic cardiomyopathy Now, I understand that during squatting preload and afterload will increase and both of them would lead to increased LV volume, but how ...
Physicsapproval's user avatar
1 vote
0 answers
19 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 ...
ayazasker's user avatar
1 vote
0 answers
23 views

Difference in heart muscle tissue growth (cardio vs low-rep intense weight lifting)

Below is a quote from a subreddit that says: I haven't kept up on the research, but the last thing I read back in college looked at weight lifters and long distance runners. Both types had larger ...
ZenVentzi's user avatar
  • 271
2 votes
1 answer
205 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 ...
Dylan Patel's user avatar
3 votes
1 answer
85 views

Should I drink coconut water daily? Many sites praise the health effect

Example article found with DDG: 8 Science-Based Health Benefits of Coconut Water The Bottom Line Coconut water is a delicious, nutritious and natural beverage that’s extremely good for you. ...
Sybil's user avatar
  • 133
3 votes
0 answers
36 views

What is Pulse Wave Velocity, any benefit in measuring it?

Some health products (e.g. smart scales) boast that they measure the heart's Pulse Wave Velocity. Is there any benefit in monitoring this parameter and trying to "improve" it via training/eating?
user avatar
2 votes
1 answer
59 views

Is Myocarditis infectious?

How can Myocarditis spread from a person who has it? Is touching a person who died of Myocarditis dangerous?
Aditya's user avatar
  • 123
6 votes
1 answer
196 views

Difference between hypovolemic shock and heart arrest caused by hypovolemia?

Is there a difference between hypovolemic shock and heart arrest caused by hypovolemia ?
Atanas's user avatar
  • 157
4 votes
1 answer
1k views

Why is the crescendo-decrescendo systolic murmur best heard at the cardiac base?

I'm writing a paper and came across a very specific question about heart sounds. Why is the crescendo-decrescendo systolic murmur best heard at the cardiac base? and why does it radiate to carotids? ...
Artur Grigio's user avatar
4 votes
2 answers
203 views

Does eating fish help high blood pressure?

The common advice for people who have been diagnosed with heart problems like hypertension is "eat more fish, especially salmon." I've done a great deal of Googling and what I can't seem to figure out ...
luthien's user avatar
  • 41
2 votes
1 answer
53 views

Intra-atrial thrombosis epidemiology

I have searched without much luck about this question: What are the epidemiological data about intra-atrial thrombosis? All I’ve found are epidemiological data about benign and malign tumors, but I ...
senseiwa's user avatar
  • 151
7 votes
1 answer
103 views

When is too much running bad for your health?

In this ted talk, cardiologist James O'Keefe argues that intensive running is bad for your heart. This conclusion is pretty alarming to me, and counter to what I have always thought. Is there a ...
The Gilbert Arenas Dagger's user avatar
1 vote
1 answer
79 views

Medical procedure to sever the brain's ability to communicate with the heart?

So, I think I read some-where that there is a surgical procedure to server the heart's ability to communicate with the brain, for reasons. A negative consequence of this was not being able to, for ...
klagaru's user avatar
  • 11
1 vote
2 answers
84 views

Why heart beats normal after AED?

I know that heart attack is when some of cells are dead. That's why heart beats abnormally and needs AED to stop it and restart. After that it beats again normally and my question is - how come since ...
Adrian Dąbek's user avatar
1 vote
0 answers
50 views

Normal Sleeping Heart Rate Range

I recently got a heart rate tracker and I've noticed that when I sleep my heart rate consistently spikes fairly high. It has reached 165 bpm before, but most times it's under 150. That seems a bit ...
drg's user avatar
  • 163
5 votes
1 answer
107 views

adequate exposure of the surgical field

What is meant by "adequate exposure of the surgical field" is this sentence: During cardiac surgery, it is necessary to aspirate blood from the cardiac chambers to provide adequate exposure of the ...
G.Hajj's user avatar
  • 53
2 votes
1 answer
233 views

What happens to the heart during cardiac arrest?

I am confused about whether the heart stops beating during cardiac arrest or not. The answer in this question states, "the heart does not pump blood sufficiently to sustain life." Isn't that the ...
Singh's user avatar
  • 259
1 vote
0 answers
58 views

Are eggs good for heart health or bad? [duplicate]

I am finding two completely contradicting posts while googling regarding health risks to the heart for excess consumption of eggs: https://www.health.harvard.edu/heart-health/are-eggs-risky-for-heart-...
MD. Mohiuddin Ahmed's user avatar
6 votes
1 answer
249 views

Should people with tachycardia avoid caffeine?

Well, caffeine increases the resting heart rate. If the resting heart rate of a person with tachycardia is 110 bpm, it may increase to 125 bpm after consuming 200 mg caffeine. My questions: Is having ...
asmani's user avatar
  • 425
4 votes
3 answers
239 views

What will happen if you keep running? What will eventually cause you to stop?

A more specific form of my question would be, "Barring mental barriers, what will lead to collapse after extended cardiovascular exercise?" I was considering asking this in the worldbuilding SE, but ...
ArbitraryRenaissance's user avatar
7 votes
1 answer
145 views

Can too much potassium from sports drinks be dangerous/lethal?

I have always been aware that sports drinks help you replace potassium lost from exercise. But I also know that too much potassium in your bloodstream is not a good thing and bad for your heart. So ...
Unknown Coder's user avatar
3 votes
0 answers
27 views

What is the most advanced non-invasive technology these days for identifying clogged arteries?

What is the most advanced non-invasive technology these days for identifying clogged arteries?
soundslikefiziks's user avatar
1 vote
0 answers
39 views

Are two cups of nescafe a day good for my health?

I drink 2 cups of Nescafe every day. 8 a.m. first cup and 12 p.m. another cup. I drink this kind of Nescafe and add with a spoon of condensed milk, not the 3 in 1. Is this habit good for my health (...
Chek Wei Tan's user avatar
2 votes
2 answers
359 views

Is it possible for the lungs and heart to work independently of one another?

I understand that the lungs take in oxygen, pass it to the heart to send throughout the body, and receive CO2 from cellular respiration that the lungs then breathe out. (Oversimplified, I know, but ...
DonielF's user avatar
  • 259
1 vote
1 answer
43 views

How long a phonocardiography (PCG) should be for diagnosis?

I have many PCG records with different lengths, what is the minimum length (minutes or seconds) that a specialist use to diagnose any abnormalities in heart? Highly appreciate your help. Cheers
monsieor's user avatar