Questions tagged [cardiology]

The study of the physiology and pathology of the heart and the cardiovascular system.

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4answers
703 views

Why does an increased heart rate mean increased blood pressure?

Say a person starts exercising. If their cardiac volume remains the same but their heart rate increases so that the overall result is an increase in cardiac output, will their blood pressure increase ...
78
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2answers
21k views

Why is the heart not in the middle of the body?

All mammals that I can think of have a high degree of bilateral symmetry (In fact, almost every animal I can think of is like this). So why is the human heart not exactly in the middle of the body? ...
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1answer
458 views

Human anti animal antibodies issues in blood testing

Do people have to be exposed to animals to get HAMA antibodies? Can these antibodies impact blood tests with false negatives as well as false positives?
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2answers
94 views

At what stage is the nervous system developed enough to interpret neuronal signals as 'pain'?

According to this article in Live Science, one of the reasons the fetus can't feel pain until 19 weeks is because the nervous system isn't fully developed. But according to this article, the heart ...
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2answers
409 views

How does heart beat faster while doing a strenuous task?

I know that when we do tasks which require extra physical effort (like running etc.), our heart beats faster. I also know that the reason behind this is that these jobs require more energy than usual ...
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1answer
29k views

How can heart disease cause excessive sweating?

According to google: What can cause sudden sweating? Excessive Sweating. A person with excessive sweating has a condition called hyperhidrosis. ... In adults, the most common cause of ...
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0answers
104 views

Trying to determine Heart Condition? ECG show no P Wave [closed]

A young woman was at the gym doing great her normal workout. She would spend 45 minutes on the elliptical and then 15 minutes doing weight training. This was the regular routine for her as she did ...
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0answers
263 views

What drives max heart rate on beta blockers?

In a healthy human being, the increase in heart rate from rest to around 100 to 110 beats per minute at low intensity exercise is due to withdrawal of the parasympathetic nervous system's influence. ...
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0answers
837 views

What's so special about Chassaignac tubercle?

1-How does massaging of carotid artery at chassaignac tubercle( anterior tubercle of transverse process of C6 vertebra ) can relieve the symptoms of Supraventricular Tachycardia? My attempt: I think ...
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2answers
6k views

What prevents backflow of blood from right atrium to vena cava during atrial systole

Vena cava is valve less. So, during atrial systole what prevents backflow of blood to them?
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4answers
961 views

Why heart beats increase when we are in a state of tension even though it is a disadvantage?

Suppose a poisonous snake bites you; this will likely cause hypertension, and it will result in your heart rate increasing dramatically. Because of the high rate of heart beats, your body will make ...
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2answers
4k views

ECG wave names origin

Why do electrocardiogram waves go P, Q, R, S, T and not like A, B, C, D? Is there any specific reason behind this?
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0answers
78 views

How much do arteries expand during pulse?

Arteries expand during a pulse. The amount of expansion may differ from artery to artery. How much do arteries expand? I understand it might be a range. Inform the same. Even values specific to some ...
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0answers
60 views

Different number of flaps in heart valves

Can anyone tell me why the different valves of heart have different number of flaps is it in any way related to evolution of homo sapiens.
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2answers
70 views

Isolating the vasculature of an organ?

Is there a chemical or process that would dissolve or remove all other tissues in an organ and leave all the vasculature intact? I am planning to make a shelf display of the blood vessels in the heart ...
2
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0answers
194 views

Why does fetal distress (hypoxia) cause bradycardia?

In a non stress test performed in the labor room, fetal bradycardia is a danger sign indicating fetal distress (hypoxia). Why does fetal hypoxia cause bradycardia while hypoxia in adults cause ...
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1answer
88 views

A hypothetical emergency situation

This question was posed to me by my Biology teacher: Consider a hypothetical emergency situation of a person shot by a bullet in the heart. The bullet goes into the body and comes out from it, ...
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2answers
338 views

What causes the cardiac ventricular pressure change during the isovolumetric part of the cardiac cycle ?

Why does the cardiac ventricular pressure change during isovolumetric contraction and relaxation. The volume ( both valves are closed) is constant, Does Boyle's Law not apply? P1V1= P2V2 at constant ...
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0answers
23k views

Exsanguination Time from Damage to Major Arteries

For a game project, I need to study how much blood loss is suffered when the major arteries of the human body are severed. I believe there are medical textbooks that have collected data on blood ...
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1answer
581 views

Why do people perceive blood pressure as the force that moves the blood forwards (see details)?

For example "Veins contain a lot of valves because the blood pressure inside them is low.". This wouldn't make any sense unless if blood pressure was perceived as the force that drives the blood ...
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1answer
46 views

Are these principles worth being validated? [closed]

Odunayo's principle of inhalation states that provided a given amount of water is ingested, inhalation through the nostrils will be excluded due to the presence of oxygen in the water. From the above ...
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0answers
145 views

Left Ventricle vs. Right Ventricle size in different Animals [closed]

Why are the right ventricles in chicken hearts significantly smaller than the left ventricles, whereas in cows the two ventricles are of roughly equal size.
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1answer
286 views

Which leads are abbreviated typically as channel ECG 1 and ECG 2?

I want make sure about the fact in the documentation of MIT-BIH NSRDB here. They just say ECG 1 and ECG 2 but not what particularly. I think they are the frontal plane channel and transverse plane ...
2
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1answer
35 views

Would a hole in a heart make it unsuitable for transplantation?

Would a hole in a heart instantly make it unsuitable for transplantation? Or could it be possible for a heart with a congenital defect to still be suitable for use is someone else's body?
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0answers
35 views

State of voltage gated sodium channels in depolarised potentials

Case 1 We learn in Physiology that during the depolarization phase in the membrane, more sodium channels tend to open as the membrane potential increases i.e., less negative. This is a kind of ...
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0answers
22 views

Why are valves preferentially affected in endocarditis?

The inside of the heart is covered by endothelium throughout. Why are valves predisposed to endocarditis? I know it can affect other structires like the septum, chordae etc. But why the valves? ...
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0answers
112 views

Evolutionary explanation of the bicuspid on the left and tricuspid on the right

The left heart handles more pressure and logically it would make sens to have a valve with three leafs on the left (If I had got to choose, I'd have put three on both sides). Other than being more ...
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2answers
393 views

Should heart-to-body energy consumption ratio equal oxygen consumption ratio?

The human heart pumps oxygen to the body, and the heart itself requires oxygen. Both the body and the heart use energy, usually expressed in calories or ergs. If we look at the energy consumption (...
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1answer
2k views

What is delayed compliance in blood vessels?

What I understand is it is a permanent stretch of the vessel wall. Is this true or does it mean something else?
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1answer
56 views

Atrial contraction in complete SA block

In a complete SA block when there's block of impulse from SA node to Atrial syncitium, The ventricles start pumping at AV nodal rhythm but how do the atria then contract?
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0answers
59 views

How much Cardiomyocyte Move in Relation to its Neurons?

I am trying to estimate how much cardiomyocyte and its things (mitochondria) move in relation to neurons Movement of neurons (1) Movement of cardiomyocytes Movement of cardiomyocytes' mitochondrias (...
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0answers
103 views

Plaque rupture flow chart reading

I am having a bit of trouble interpreting flow charts given in my biology question sets. Given the following stimulus The Question is : In which of the following options does each substance play ...
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5answers
9k views

How did the cardiovascular system evolve?

How has evolution created our blood, lungs and the heart? We can't exist without blood, which transports the oxygen to all areas of our body. However, the blood needs a lung, which gives it the ...
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0answers
130 views

Is there a naturally occurring mechanism in the body for cleaning plaque buildup in arteries?

Is there a naturally occurring mechanism in the body for cleaning plaque buildup in arteries ?
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1answer
8k views

Can defibrillation be done with a car battery?

Can successful defibrillation be done with a car battery? Is it POSSIBLE for this to work? Let's say you are stuck on a very remote place and something happens to someone... Moreover, can you jump ...
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1answer
530 views

What is the relationship between stroke volume of blood and ventricular end-diastolic volume? [closed]

I do know what each term means. That is, i know that stroke volume is: the volume of blood pumped by each contraction of a ventricle, while ventricular end-diastolic volume is: the volume of blood in ...
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2answers
2k views

What is the cause that angina pectoris is felt in your left arm?

When someone has heart problems sometimes they feel pain in their left arm. But why is the left arm painful?
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2answers
1k views

Why are vegetations in Infective endocarditis common on the atrial side?

Robbin's Pathology says that vegetations of IE are more common on the atrial side in AV valves. In Liebmann Sack's Endocarditis, which is a sterile (non bacterial) type of endocarditis, the underside ...
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1answer
496 views

What is a lethal dose of THC?

With the oil form of THC being stronger then ever. What would happen if one was to take a stomach full of THC oil?
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0answers
22 views

How does the Sensitivity of Sokolow-Lyon indexes change by age?

I am studying the indicator and how diseases/age affect its sensitivity. However, no publication about it in PubMed and no luck in Escardio. How does the sensitivity of Sokolow-Lyon index and/or ...
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0answers
38 views

Pathogenesis of Cardiac Atypia?

I am studying the pathogenesis of atypia in cardiac cells where the etiology is most commonly irritation or infection and where the precancerous risk depends on the context of diagnosis. This fact ...
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1answer
129 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 ...
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1answer
163 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 ...
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0answers
130 views

Average Beginning of Action Potential in ECG by t-f HRV

I have some ECG data where I am estimating the average beginning of the action potential. I am interested in the discrete Fourier analysis of joint t-f HRV when input data is ECG. Frequency domain ...
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1answer
9k views

What is the speed of blood?

The speed of blood may vary from one place to another and may be quite low in the tiniest vessels compared to the biggest one. What is the speed of blood while exiting a normal human heart?
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1answer
5k views

What is the function of the Moderator band?

The moderator band in the right ventricle is a band sorts of muscle which consists of a significant branch of the AV bundle. Does it mean it delivers impulses to the anterior papillary muscle faster? ...
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0answers
106 views

Determination of Ageing by ECG inclusions/exclusions?

I am studying ageing and considering ECG signal because of its high sensitivity in theory (escardio). Some factors Sensitivity Gender Medical treatment ... Benchmark: RTG dental + wrist uncertainty ...
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1answer
2k views

Is it possible to consciously increase or decrease your own heart beat? [closed]

By doing yoga, can we manipulate our own heart beat? Is that possible for humans?
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2answers
200 views

Persistent HPV and CVD in Women? [closed]

Cardiovascular disease is the number one morbidity factor of women. I am studying the relationship between persistent HPV infection and CVD (Cardiovascular Disease) in inadequate immune responses. ...
2
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1answer
2k views

How are isovolumetric contraction and afterload related in the cardiac cycle?

In the cardiac cycle isovolumetric contraction occurs and causes a pressure gradient. The "afterload" is the pressure exerted on the ventricle from the artery. Is the afterload the cause of ...