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

Sports drinks contain trivial amounts of potassium. For example, one US gallon of Gatorade contains 480 mg of potassium, which is roughly comparable to a single banana and much less than a sweet ...
Carey Gregory's user avatar
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7 votes
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Is Myocarditis infectious?

Myocarditis itself is not a virus nor is it contagious - the term refers an inflammation of the myocardium (a.k.a. the heart muscle). A viral infection is probably the most common cause of myocarditis ...
motosubatsu's user avatar
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7 votes
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Difference between hypovolemic shock and heart arrest caused by hypovolemia?

Hypovolemic shock may be a reversible cause of cardiac arrest (5) Mechanisms: Acute cardiac ischemia and myocardial infarction: these are due to decreased oxygen supply to the heart itself (remember ...
Physicsapproval's user avatar
7 votes

What happens to the heart during cardiac arrest?

No, a heart does not necessarily stop beating during cardiac arrest. Cardiac arrest occurs any tine the heart cannot pump blood to the brain at a rate/volume sufficient for the patient to remain ...
anongoodnurse's user avatar
7 votes

How does a prosthetic heart valve "burst"?

There are a number of different heart valve prostheses, and the age and type of the valve in question would make answering the question somewhat easier and more specific. Prosthetic heart valves are ...
Gerry Creager's user avatar
6 votes

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

If the runner can't drink then dehydration will be the first thing that takes him out. Water is the one essential thing he's going to lose rapidly through sweat, urine and respiration, and as he loses ...
Carey Gregory's user avatar
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6 votes
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What is the best cooking oil for a person with ischemic heart disease?

To make it simple: There are two types of fat: unsaturated ("good fat") and saturated and trans fat ("bad fat"). Current dietary guidelines (American Heart Association, WHO) suggest that saturated ...
M. Arrowsmith's user avatar
5 votes

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

The above answer is correct: no they can't function independently. I want to build on that answer with a couple additional points. Consider that your heart beats while you hold your breath - but it ...
DoctorWhom's user avatar
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5 votes
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Is it possible for the lungs and heart to work independently of one another?

You're overlooking one important point: Both the heart and lungs are living tissue too, and without both circulating blood and oxygen they will die just like all the other tissues in the body. So no, ...
Carey Gregory's user avatar
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5 votes
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Why is the crescendo-decrescendo systolic murmur best heard at the cardiac base?

It's not, unless you are using the term "base" to refer to the aortic root of the heart rather than the apex. A systolic "crescendo-decrescendo murmur" is the classic description for the murmur ...
DoctorWhom's user avatar
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5 votes
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adequate exposure of the surgical field

It simply means visually exposing the tissues the surgeon needs to operate on. For example, if the surgeon needs to cut or suture inside one of the chambers and it's full of blood, they would be ...
Carey Gregory's user avatar
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5 votes
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Should people with tachycardia avoid caffeine?

A regular caffeine consumer will likely develop a partial or complete tolerance to many caffeine effects and side effects, including increased heart rate. Tolerance develops within few days of regular ...
Jan's user avatar
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5 votes
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Why do calcium channel blockers have an adverse effect of edema but Beta Blockers do not cause edema as a side effect?

It has to do with different mechanism of action of both substances. Both calcium channel blockers and beta blockers are used to lower blood pressure, but the ways, how the hypotensive effect is ...
jwdietrich's user avatar
5 votes
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Difference between strength and hypertrophy?

The difference between the two concepts you are talking about is "physiological" versus "pathological" hypertrophy. Shimizu and Minamino note (2016. PMID 27262674: Cardiac ...
Ian Campbell's user avatar
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4 votes
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Why squatting leads to decrease in MVP murmur

The murmur from HOCM is from the mitral valve leaflet jamming into the septum, also called systolic anterior motion (SAM). This disappears when you increase the volume of LV because if you increase ...
Janice's user avatar
  • 86
4 votes
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What benefits for more EKG leads?

While Holters and Zios are great for long-term monitoring, the 12-lead ECG can give information that is more specific to the anatomical regions of the heart. The leads are grouped as follows: II, III,...
Sudie's user avatar
  • 146
4 votes

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

Fever is a common symptom of COVID-19. Fever is commonly associated with tachycardia, as they are both part of the sympathetic response to illness. For example: Karjalainen, J., & Viitasalo, M. (...
Bryan Krause's user avatar
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3 votes
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Myocardial Ischemic Contractile Failure & Potassium

Your understanding about the mechanism by which the K+ ions leak out of the cardiac cell during ischaemia is correct. But, regarding the latter part, lets discuss what is the situation of K+ ions in a ...
Harshit Shah's user avatar
3 votes
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How can I take blood pressure into the cardiac output formula?

For calculation of Bp and CO, Bp = CO * TPR CO = SV * HR Where tpr is total peripheral resistance, HR is heart rate(bpm), SV is stroke volume SV = End diastolic vol - end systolic vol Now, there ...
Physicsapproval's user avatar
3 votes
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What will happen if you keep running? What will eventually cause you to stop?

It's been my understanding that a buildup of lactic acid (aka lactate) eventually causes the muscles to stop being able to process glucose. This article from Scientific American describes the ...
BillDOe's user avatar
  • 1,400
3 votes

Does eating fish help high blood pressure?

Question: Does eating (fatty) fish help to lower high blood pressure or does it help only when eaten instead of red meat? Answer: Merely increasing fish, including oily fish, consumption without ...
Jan's user avatar
  • 15.9k
3 votes

Intra-atrial thrombosis epidemiology

In children, right atrial thrombosis is associated with placement of a central venous catheter. Berman W Jr, Fripp RR, Yabek SM, Wernly J, Corlew S. Great vein and right atrial thrombosis in ...
Diana Petitti's user avatar
3 votes
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When is too much running bad for your health?

The consensus view is given here. So, the views of James O'Keefe are not widely accepted in the medical community. Suppose, however, that the adverse effects of strenuous long endurance exercise he ...
Count Iblis's user avatar
  • 2,270
3 votes

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

I believe the term you're looking for is cardiac sympathetic denervation (CSD). This is a fairly non-technical explanation of the procedure. It can be left side only (LCSD), right side only (RCSD), or ...
Carey Gregory's user avatar
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3 votes
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Can pectus excavatum increase the risk of cardio vascular disease?

This is a very interesting question. Thank you. Just as a small background on pectus excavatum (PE) (also known as "funnel chest"). It is characterised by depression of the sternum that begins over ...
M. Arrowsmith's user avatar
3 votes

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

Electrocardiography (ECG) ECG Leads Firstly, it is important to clarify that a lead (like lead 2) does not refer to one of the electrodes on the patient. Each lead represents the potential difference ...
Chris's user avatar
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3 votes

How does blood flow change between systolic and diastolic phases?

Flow is roughly constant once you get past the arterioles. You can see that on the figure you provided, no other source is needed: there's no pulsatile pressure there, just constant pressure ...
Bryan Krause's user avatar
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3 votes

How does blood flow change between systolic and diastolic phases?

General relative flow velocity in different vessel types I found a nice image here which gives a general idea of several haemodynamic parameters over different vessel types: Thus, this source says ...
Philip Klöcking's user avatar
2 votes
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Isolating blood vessels and vasculature of the heart?

Yes, this can basically be accomplished via plastination, whereby they replace the normal water in tissue with a form of silicone. You can use it on virtually any kind of tissue; first time I walked ...
Gregorio Litenstein's user avatar
2 votes
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Positive deflection of an ECG

The mechanism is depicted in the diagram you posted, most obvious in "A": ECG (and any voltage measurement) is based on a potential difference You don't measure the voltage at one spot, you measure ...
Bryan Krause's user avatar
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