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Doctor insights on: Hypoxia Causes Vasoconstriction

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Does hypoxia cause vasoconstriction or vasodilation?

Does hypoxia cause vasoconstriction or vasodilation?

Vasoconstriction: Low oxygen cause blood vessels to constrict. The body is trying to use whatever oxygen is available to maintain critical body functions and constrict blood flow to others. ...Read more

Dr. Al Hegab
238 Doctors shared insights

Hypoxia (Definition)

Hypoxia, is a condition in which the body as a whole or a region of the body is deprived of adequate oxygen supply. It is classified into 4 groups: - hypoxemic - oxygen is low - anemic - decreased ability for hemoglobin to carry oxygen. - ischemic - decreased blood flow. - histotoxic - oxygen is reaching the cells, but the cells are unable to ...Read more


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Please explain why vasoconstriction happens in hypoxia?

Please explain why vasoconstriction happens in hypoxia?

Not whole body: In fact more parts of the body will have vasodilation, as in organs and muscles you then resort to anaerobic respirations which causes Lactic Acid production and causes vasodilation. The skin on the other hand thee may be vasoconstriction to preserve the flow of oxygen to the essential organs. ...Read more

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What is vasoconstriction? What is the real cause of it and how to avoid from getting it?

Blood vessel narrowi: Vasoconstriction refers to periodic narrowing of arteries. This is most commonly precipitated by cold weather, dehydration, certain medications, caffeine and some disease conditions. It is generally a reflexive response of arteries to cold weather etc. ...Read more

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Does vasoconstriction cause ed?

Here are some. ..: Here are something that can really help you to keep your sex going as well and as long as you can be: low-risk healthy lifestyle without overindulgence & obsession, including sex, plus judicious use of medication. But, nothing will last forever. So, go to see a sensible Doc for sensible Rx and counseling. More? To http://formefirst. Com/eBlogList. Html. ...Read more

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How does hypoxemia cause vasoconstriction?

Reactive: When oxygen levels are low the peripheral vessels constrict and blood is preferentially shunted to the vital organs. ...Read more

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Is vasoconstriction caused by Adderall temporary or permanent?

Is vasoconstriction caused by Adderall temporary or permanent?

Temporary: Adderall is cleared quickly by the body and the vasoconstriction would resolve after clearance. Continued administration of the medication will likely result in the body adjusting so that the affect will not continue to occur. If it does then an alternative medication must be considered. Best regards. ...Read more

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Can vasoconstriction cause a urethral stricture to reoccur?

Can vasoconstriction cause a urethral stricture to reoccur?

Not really: Unless you've had a urethroplasty where the stricture was cut out and sewn back together, there's always a good chance of recurrence because the scar by definition has a poor blood supply. Not the same thing as vasoconstriction. ...Read more

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Can monosodium glutamate cause vasoconstriction (to any degree in any part of the body) in some people?

Can monosodium glutamate cause vasoconstriction (to any degree in any part of the body) in some people?

No... not as yet: No clinical evidence suggests that MSG promotes, incites or exacerbates disease states such as hypertension. When used as a seasoner to foods such as soups it's presence allows for up to 30-40% reduction of sodium chloride, which can exacerbate disease such as congestive heart disease. ...Read more

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Why does codeine cause vasodilation in the body but vasoconstriction in the lungs?

Why does codeine cause vasodilation in the body but vasoconstriction in the lungs?

Doubtful: While vasodilitation has been reported I could not find evidence for vasoconstriction in lungs. Exact mechanism is not clear. Personally I have not found any significant drop in BP in scores of patients taking codeine. ...Read more

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I read that psuedophedrine's mode of action is vasoconstriction (narrowing in arteries). So does this mean that it causes arteriosclerosis?

I read that psuedophedrine's mode of action is vasoconstriction (narrowing in arteries). So does this mean that it causes arteriosclerosis?

No: Vessels narrowing, is temporary through smooth muscle contraction in the vessels wall. While arteriosclerosis, stands for hardening of the vessel walls due to deposition of fat / calcium, that's why people with hypertension better not take pseudoephedrine which can raise their blood pressure further, wish you wellness ...Read more

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Does an adrenaline surge (from anxiety or exercise) when taking a non-selective B-blocker cause coronary vasoconstriction? Selective B1-blckr better?

Does an adrenaline surge (from anxiety or exercise) when taking a non-selective B-blocker cause coronary vasoconstriction? Selective B1-blckr better?

Beta blockers: B blockers are used to treat angina caused by coronary disease, and they are effective. They reduce heart rate and the workload of the heart, including response to exercise. With very high norepinephrine conditions, eg. pheochromocytoma, blocking beta can cause unopposed alpha and raise BP. But that is a very rare condition. ...Read more

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Can Cipralex and SSRIs cause vasoconstriction and raise blood pressure?

Can Cipralex and SSRIs cause vasoconstriction and raise blood pressure?

Possibly: While SSRIs generally are very selective to the neurotransmitter serotonin, there may be some some effects on norepinephrine receptors. This theoretically can raise pressure, however in practice we typically do not see this. ...Read more

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Does caffeine cause vasoconstriction, or vasodilation of the renal arteries?

Does caffeine cause vasoconstriction, or vasodilation of the renal arteries?

Vasoconstrict: The mechanisms of the kidneys are complex. Caffeine tends to cause vasoconstriction. The kidneys chemical mediators can counteract this effect however. Just like anything we take into our bodies you should use caffeine in moderation. Don't overdo it. ...Read more

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Nicotine causes vasoconstriction. Does the vasoconstriction decrease blood vessel volume at the same time?

Nicotine causes vasoconstriction. Does the vasoconstriction decrease blood vessel volume at the same time?

Yes: Flow through the constricted vessels increases, and the blood will move to the venous system from the arterial system. Chronic constriction leads to hypertension, and likely plays a role in peripheral arterial disease. ...Read more

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I took Seroquel (quetiapine) for a while, I have noticed penis shrinkage, I also read about someone else with this problem. Seroquel (quetiapine) cause vasoconstriction?

I took Seroquel (quetiapine) for a while, I have noticed penis shrinkage, I also read about someone else with this problem. Seroquel (quetiapine) cause vasoconstriction?

Not much evidence: I am not finding much quality evidence for this side effect you describe. I am seeing that Seroquel (quetiapine) can rarely cause painful or prolonged erections and difficulty obtaining erections, but nothing from reliable sources about decreased penis size. Plus, if you are no longer taking Seroquel (quetiapine) but still experiencing this, I would not blame the Seroquel (quetiapine) necessarily. Talk to your prescribing doctor. ...Read more

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Smoking is making me have attacks. I think I might have a blockage in vertebrobasilar artery secction. Ischemia caused by vasoconstriction. Tia?

Smoking is making me have attacks. I think I might have a blockage in vertebrobasilar artery secction. Ischemia caused by vasoconstriction. Tia?

Need more info: In order to give you an informed answer, any physician would need more information on what you mean by attacks that are triggered by smoking. ...Read more

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Will midodrine cause any vasoconstriction of coronary arteries aswell?

Will midodrine cause any vasoconstriction of coronary arteries aswell?

No evidence seen: Mididrine is an alpha1-agonist and exerts its actions via activation of the alpha-adrenergic receptors of the arteriolar and venous vasculature, producing an increase in vascular tone and elevation of blood pressure.

There is some recent evidence in animal coronaries there are Alpha and beta receptors in large coronaries and beta in small coronaries, but no data avialabe for midodrine. ...Read more

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Does a cigarette cause coronary artery vasoconstriction? If yes, wouldn't this cause a angina if you started exercising?

Does a cigarette cause coronary artery vasoconstriction? If yes, wouldn't this cause a angina if you started exercising?

Vasoconstriction: Cigarettes are associated with coronary artery vasoconstriction. This constriction could cause angina if combined with exercise in some people, but it would not do so in everyone. Much of the response would be based on the underlying health of the heart and coronary arteries. ...Read more

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If Nictotine causes coronary & cerebral vasoconstriction why doesn't it cause angina or light headedness in people running with a HR of 180BPM?

If Nictotine causes coronary & cerebral vasoconstriction why doesn't it cause angina or light headedness in people running with a HR of 180BPM?

Internal controls: Dominate responses, not chemistry administered from outside; despite marketing to the contrary. Medicine is low-Tech: the Hi-Tech (as embodied Soul↔Mind↔Brain↔Body creatures sending >1, 000, 000 orders/sec brain→body with similar feedback) is within. Artery & arteriole control is from brain plus local control. Study: http://goo. Gl/zZT5ou & https://goo. Gl/xqf4e4 for better understanding. ...Read more

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Why does norepinephrine cause more vasoconstriction than heart rate increase?

Why does norepinephrine cause more vasoconstriction than heart rate increase?

Alpha receptors: Ne has a higher affinity for the Alpha receptors which are located in the peripheral arterioles and cause vasoconstriction. Beta receptors are. Responsible for accelerating the heart rate. ...Read more

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Could midodrine cause too much vasoconstriction in the brain and cause reduced blood flow and even brain ischemia?

Could midodrine cause too much vasoconstriction in the brain and cause reduced blood flow and even brain ischemia?

Midodrine: This is a very rare reported side effect, which is not proven to be definitely related to midodrine. ...Read more

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Does nicotine cause a big vasoconstriction effect on coronary arteries? If any how long does it last? Surely body would override to myocardium needs?

Does nicotine cause a big vasoconstriction effect on coronary arteries? If any how long does it last? Surely body would override to myocardium needs?

Not necessarily so: Here's an article witch will answer most of your questions:
http://content. Onlinejacc. Org/article. Aspx? Articleid=1121737
Just like the body can't override the effects of cyanide gas ...Read more

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Got dysautonomia, causes cerebral vasoconstriction resulting in lightheadedness daily, brain mri normal, why does it constrict? How do dilate? Bp norm

Got dysautonomia, causes cerebral vasoconstriction resulting in lightheadedness daily, brain mri normal, why does it constrict? How do dilate? Bp norm

Treatment available: Medications such as beta blockers and sometimes calcium channel blockers can help. Working with a physical therapist trained in this disorder can achieve good results, but it takes months of treatment. Hope this was helpful. Best of luck. Dr R ...Read more

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If there is vasoconstriction to your arteries and veins due to consistent adrenaline like from pheochromocytoma, can that cause delayed wound healing?

If there is vasoconstriction to your arteries and veins due to consistent adrenaline like from pheochromocytoma, can that cause delayed wound healing?

Yes, I suppose: Theoretically. But pheo's are so rare that no large studies have been done, I am sure. It would only be during those periods when vasoactive chemicals were actually circulating. In people who get drugs in order to raise blood pressure from septic shock, there is probably impaired wound healing. ...Read more

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I get freezing cold after eating refined carbs. Bread rice etc vasoconstriction. Hands turn dark purple, white. Lips freezing. Paleness. Possible cause?

I get freezing cold after eating refined carbs. Bread rice etc vasoconstriction. Hands turn dark purple, white. Lips freezing. Paleness. Possible cause?

Unrelated: I am not sure that these two are related. I am unaware of correlation with carbs and vasoconstriction. Purple hands are something that you may want to have looked into though as this can be sign of some vasculitis or other internal process. ...Read more

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Can sodium channel blockers treat vasoconstriction and ED?

NO: Are you referring to calcium channel blocker? The drugs you are talking about such as viagra (sildenafil) are Phosphodiesterase inhibitors. They will treat ed but I am not sure what you mean by vasoconstriction. The PDI's will prevent the release of blood from the organ prematurely and there by treat the ED.
See your doc for further info. ...Read more

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How do you get vasoconstriction?

How do you get vasoconstriction?

Vasoconstriction: Vasoconstriction is a phenomenon where in the blood vessels constrict in response to various physiological or pathological factors. Constriction of vessel results in lesser blood flow and increases the blood pressure. It may occur in acute blood loss, cold environment, sepsis, septic shock, etc. ...Read more

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What is the definition or description of: vasoconstriction?

See below: Vasoconstriction is the narrowing of the blood vessels resulting from contraction of the muscular wall of the vessels, particularly the large arteries and small arterioles. The process is the opposite of vasodilation, the widening of blood vessels. The process is particularly important in staunching hemorrhage and acute blood loss. ...Read more

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How much vasoconstriction does 2.5mg midodrine give?

Midodrine: People react differently to the same dose of drugs, you should discuss with the dr. Who knows you. ...Read more

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Nicotine induced vasoconstriction--can it lead to permanent constriction of vains.?

Nicotine induced vasoconstriction--can it lead to permanent constriction of vains.?

Arteries, not veins: Thromboangiitis obliterans

buerger's disease is a rare disorder associated with heavy smoking. ...Read more

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Could dmaa be used in conjunction with l-theanine to counteract the dangerous vasoconstriction of dmaa?

Dmaa: Don't understand your abbreviations. It is dangerous to use them as they may be confused. Let's chat. ...Read more

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How could vasoconstriction affect cardiac output?

How could vasoconstriction affect cardiac output?

It lowers it: Vasoconstriction increases the resistance to flow. This is called an afterload. It is like a pump having to pump water up a steep hill; it won't pump as well as on flat land. ...Read more

Vasoconstriction (Definition)

Vasoconstriction is the narrowing of the blood vessels resulting from contraction of the muscular wall of the vessels, particularly the large arteries and small arterioles. The process is the opposite of vasodilation, the widening of blood vessels. The process is particularly important in staunching hemorrhage ...Read more