Vasodilators Health Dictionary

Vasodilators: From 1 Different Sources


Substances that dilate blood vessels. Coronary vasodilators, such as NITRATES, CALCIUMCHANNEL BLOCKERS and POTASSIUM-CHANNEL ACTIVATORS, are used in heart failure to improve blood supply to the heart. Peripheral vasodilators affect the blood vessels in the limbs and are used to treat conditions due to poor circulation such as CHILBLAIN and RAYNAUD’S DISEASE.
Health Source: Medical Dictionary
Author: Health Dictionary

Kinins

Substances present in the body which are powerful VASODILATORS. They also induce pain and are probably involved in the production of the headache of MIGRAINE. In addition, they play a part in the production of ALLERGY and ANAPHYLAXIS.... kinins

Prostacyclin

A prostaglandin (see PROSTAGLANDINS) produced by the endothelial lining of the blood vessels. It inhibits the aggregation of PLATELETS, and thereby reduces the likelihood of the blood clotting. It is also a strong vasodilator (see VASODILATORS).... prostacyclin

Prostaglandins

Those natural substances, so-called because they were ?rst discovered in the SEMEN and thought to arise in the PROSTATE GLAND, are a group of fatty-acid substances with a wide range of activity. The richest known source is semen, but they are also present in many other parts of the body. Their precise mode of action is not yet clear, but they are potent stimulators of muscle contraction and they are also potent VASODILATORS. They cause contraction of the UTERUS and have been used to induce labour (see PREGNANCY AND LABOUR); they are also being used as a means of inducing therapeutic abortions (see ABORTION).

Prostaglandins play an important part in the production of PAIN, and it is now known that ASPIRIN relieves pain by virtue of the fact that it prevents, or antagonises, the formation of certain prostaglandins. In addition, they play some, although as yet incompletely de?ned, part in producing in?ammatory changes. (See INFLAMMATION; NON-STEROIDAL ANTIINFLAMMATORY DRUGS (NSAIDS).)

Thus prostaglandins have potent biological effects, but their instability and rapid metabolism make them short-acting. They are produced but not stored by most living cells and act locally. The two most important prostaglandins are prostacycline and thromboxane: prostacycline is a vasodilator and an inhibitor of platelet aggregation; thromboxanes have the opposite effects and cause vasoconstriction and platelet aggregation. The NSAIDs act by blocking an ENZYME called cyclo-oxygenase which converts arachidonic acid to the precursors of the various prostaglandins. Despite their potent pharmacological properties, the role of prostaglandins in current therapeutics is limited and controversial. They have been used most successfully as an inhibitor of platelet aggregation in extra-corporeal haemoperfusion systems. The problems with the prostacyclines is that they have to be given intravenously as they are inactive by mouth, and continuous infusion is required because the drug is rapidly eliminated with a half-life of minutes. Side-effects tend to be severe because the drug is usually given at the highest dose the patient can tolerate. The hope for the future lies in the exploitation of the compound to generate, synthetically, stable orally active prostacycline analogues which will inhibit platelet aggregation and hence thrombotic events, and yet have minimal effects on the heart and blood vessels.... prostaglandins

Raynaud’s Disease

So called after Maurice Raynaud (1834–81), the Paris physician who published a thesis on the subject in 1862. This is a condition in which the circulation (see CIRCULATORY SYSTEM OF THE BLOOD) becomes suddenly obstructed in outlying parts of the body. It is supposed to be due to spasm of the smaller arteries in the affected part, as the result of them responding abnormally to impuilses from the SYMPATHETIC NERVOUS SYSTEM. Its effects are increased both by cold and by various diseases involving the blood vessels.

Symptoms The condition is most commonly con?ned to the occurrence of ‘dead ?ngers’ – the ?ngers (or the toes, ears, or nose) becoming white, numb, and waxy-looking. This condition may last for some minutes, or may not pass o? for several hours, or even for a day or two.

Treatment People who are subject to these attacks should be careful in winter to protect the feet and hands from cold, and should always use warm water when washing the hands. In addition, the whole body should be kept warm, as spasm of the arterioles in the feet and hands may be induced by chilling of the body. Su?erers should not smoke. VASODILATORS are helpful, especially the calcium antagonists. In all patients who do not respond to such medical treatment, surgery should be considered in the form of sympathectomy: i.e. cutting of the sympathetic nerves to the affected part. This results in dilatation of the arterioles and hence an improved blood supply. This operation is more successful in the case of the feet than in the case of the hands.... raynaud’s disease

Vasodilator Drugs

A group of drugs that widen blood vessels.

Vasodilator drugs include ACE inhibitors, alphablockers, calcium channel blockers, nitrate drugs, and sympatholytic drugs.

They are used to treat disorders in which abnormal narrowing of blood vessels reduces blood flow through tissues, impairing the supply of oxygen.

Such disorders include angina pectoris and peripheral vascular disease.

Vasodilators are also used to treat hypertension and heart failure.

All vasodilator drugs may cause flushing, headaches, dizziness, fainting, and swollen ankles.... vasodilator drugs

Kinin

n. one of a group of naturally occurring polypeptides that are powerful *vasodilators, which lower blood pressure, and cause contraction of smooth muscle. The kinins bradykinin and kallidin are formed in the blood by the action of proteolytic enzymes (kallikreins) on certain plasma globulins (kininogens). Kinins are not normally present in the blood, but are formed under certain conditions; for example when tissue is damaged or when there are changes in the pH and temperature of the blood. They are thought to play a role in inflammatory response.... kinin

Nitrates

pl. n. a class of drugs used as coronary *vasodilators for the treatment and prevention of angina attacks. They include *glyceryl trinitrate, *isosorbide dinitrate, and isosorbide mononitrate.... nitrates

Atherosclerosis

Atheroma is a name given to the disease where fatty and mineral deposits attach themselves to the walls of the arteries. Usually starts from a deposit of cholesterol which leaks into the inner surface of the artery causing a streak of fat to appear within the wall. As the fatty streak grows deeper tissue within the arterial wall is broken down and the mechanism for clotting blood is triggered. The result is formation of atheromatous plaque that may clog an artery, precipitate a clot (known as an embolism) and travel to a smaller artery which could become blocked. The end result of atherosclerosis is invariably arteriosclerosis in which thickening and hardening leads to loss of elasticity.

Atherosclerosis can be the forerunner of degenerative heart and kidney disease, with rise in blood pressure.

A study of Australian ’flu epidemic diseases revealed influenza as a major cause of cardiovascular disease and in particular, atherosclerosis.

Causes. Excessive smoking and alcohol, fatty foods, hereditary weakness, stress and emotional tension that release excessive adrenalin into the bloodstream. Toxic effects of environmental poisons (diesel fumes). Fevers.

Symptoms. Cold hands and feet, headache, giddiness. Diminished mental ability due to thickening of arteries in the brain. Pain on exertion, breathlessness and fatigue. Diagnosis of atheroma of main arteries: by placing stethoscope over second right intercostal space, half inch from the sternum, the second aortic sound will be pronounced.

Treatment. Surface vasodilators, Cardioactives. Anti-cholesterols.

Alternatives. Teas. To lower cholesterol levels and shrink hardened plaque: Alfalfa, Chamomile, Borage, Olive leaves, Mint, Nettles, Marigold, Garlic, Lime flowers, Yarrow, Horsetail, Hawthorn, Ginkgo, Orange Tree leaves, Meadowsweet, Eucalyptus leaves, Ispaghula, Bromelain. Rutin (Buckwheat tea).

Artichoke leaves. Spanish traditional. 2 teaspoons to each cup of water; simmer 2 minutes. Drink cold: 1 cup 2-3 times daily.

Mistletoe leaves. 1-2 teaspoons to each cup cold water steeped 8 hours (overnight). Half-1 cup thrice daily.

Tablets, or capsules. Garlic, Mistletoe, Poke root, Rutin, Hawthorn, Motherwort, Ginkgo, Bamboo gum. Liquid Extracts. Mix Hawthorn 2; Mistletoe 1; Barberry 1; Rutin 1; Poke root half. Dose: 30-60 drops thrice daily.

Tinctures. Mix: Hawthorn 2; Cactus flowers 2; Mistletoe 1; Capsicum half. Dose: 1-2 teaspoons thrice daily in water before meals.

Powders. Mix equal parts: Bamboo gum, Hawthorn, Mistletoe, Rutin, Ginger. Fill 00 capsules. Dose: 2-4 capsules, or quarter to half a teaspoon (375-750mg) thrice daily before meals.

Threatened stroke. Tincture Arnica BPC (1949): 3-5 drops in water morning and evening. Practitioner only.

Evening Primrose oil. Favourable results reported. (Maxepa)

Diet. Vegetarian. Low fat. Low salt. High fibre. Lecithin, polyunsaturated oils, artichokes, oily fish (see entry). Linseed on breakfast cereal. Garlic at meals, or Garlic tablets or capsules at night to reduce cholesterol.

Vitamins. A, B-complex, B6, B12, C (2g), E (400iu), daily.

Minerals. Chromium, Iodine, Potassium, Selenium, Magnesium, Manganese, Zinc.

“A man is as old as his arteries” – Thomas Sydenham, 17th century physician.

“A man’s arteries are as old as he makes them” – Robert Bell MD, 19th century physician. ... atherosclerosis

Frostbite

May attack those who face cold exposure as an occupational hazard, or who wear inadequate clothing in severe weather. Frost-nip of cheeks and chin. Dermis is frozen. May lead to Raynaud’s Disease, or long-term vein disease. Dullness of sensation.

Treatment: frozen limbs should not be rubbed or manipulated, but thawed out in luke-warm water, a hand still remaining in the glove or foot in the boot. Vasodilators to equalise the circulation.

Teas. Boneset, Chamomile, Elderflowers, Feverfew, Hyssop, Lime flowers, Peppermint, Sage, Gotu Kola, Yarrow. Buckwheat.

Echinacea: tablets, liquid extract, tinctures.

Never give alcohol or use hot water bottles. Paint with Friar’s balsam followed by smoothing-in a little Olive oil. Abundant Vitamin C drinks. Life Drops in tea. Ginger, Capsicum. Horseradish.

Old Norwegian remedy: cold mashed onion poultice.

Supplements. Hourly: Vitamin C 1g; Vitamin E 500iu. ... frostbite

Heart Failure

Inability of the heart to cope with its workload of pumping blood to the lungs and to the rest of the body. Heart failure can primarily affect the right or the left side of the heart, although it most commonly affects both sides, in which case it is known as congestive, or chronic, heart failure.

Left-sided heart failure may be caused by hypertension, anaemia, hyperthyroidism, a heart valve defect (such as aortic stenosis, aortic incompetence, or mitral incompetence), or a congenital heart defect (see heart disease, congenital). Other causes of left-sided heart failure include coronary artery disease, myocardial infarction, cardiac arrhythmias, and cardiomyopathy.

The left side of the heart fails to empty completely with each contraction, or has difficulty in accepting blood that has been returned from the lungs. The retained blood creates a back pressure that causes the lungs to become congested with blood. This condition leads to pulmonary oedema.

Right-sided heart failure most often results from pulmonary hypertension, which is itself caused by left-sided failure or by lung disease (such as chronic obstructive pulmonary disease (see pulmonary disease, chronic obstructive). Right-sided failure can also be due to a valve defect, such as tricuspid incompetence, or a congenital heart defect.

There is back pressure in the circulation from the heart into the venous system, causing swollen neck veins, enlargement of the liver, and oedema, especially of the legs and ankles. The intestines may become congested, causing discomfort.

Immediate treatment consists of bed rest, with the patient sitting up. Diuretic drugs are given, and digitalis drugs and vasodilators, especially ACE inhibitors, may also be administered. Morphine and oxygen may be given as emergency treatment in acute left-sided failure.... heart failure

Coronary Heart Disease

The cause of: coronary occlusion, coronary blockage, coronary thrombosis. A heart attack occurs when a coronary artery becomes blocked by swellings composed, among other things, of cholesterol. Such swellings may obstruct the flow of blood leading to a blood clot (thrombus). Cholesterol is a major cause of CHD.

Coronary thrombosis is more common in the West because of its preference for animal fats; whereas in the East fats usually take the form of vegetable oils – corn, sunflower seed, sesame, etc. Fatty deposits (atheroma) form in the wall of the coronary artery, obstructing blood-flow. Vessels narrowed by atheroma and by contact with calcium and other salts become hard and brittle (arterio-sclerosis) and are easily blocked. Robbed of oxygen and nutrients heart muscle dies and is replaced by inelastic fibrous (scar) tissue which robs the heart of its maximum performance.

Severe pain and collapse follow a blockage. Where only a small branch of the coronary arterial tree is affected recovery is possible. Cause of the pain is lack of oxygen (Vitamin E). Incidence is highest among women over 40 who smoke excessively and who take The Pill.

The first warning sign is breathlessness and anginal pain behind the breastbone which radiates to arms and neck. Sensation as if the chest is held in a vice. First-line agent to improve flow of blood – Cactus.

For cholesterol control target the liver. Coffee is a minor risk factor.

Measuring hair calcium levels is said to predict those at risk of coronary heart disease. Low hair concentrations may be linked with poor calcium metabolism, high aortic calcium build-up and the formation of plagues. (Dr Allan MacPherson, nutritionist, Scottish Agricultural College, Ayr, Scotland)

Evidence has been advanced that a diagonal ear lobe crease may be a predictor for coronary heart disease. (American Journal of Cardiology, Dec. 1992)

Tooth decay is linked to an increased risk of coronary heart disease and mortality, particularly in young men. (Dr Frank De Stefano, Marshfield Medical Research Foundation, Wisconsin, USA) Treatment. Urgency. Send for doctor or suitably qualified practitioner. Absolute bedrest for 3 weeks followed by 3 months convalescence. Thereafter: adapt lifestyle to slower tempo and avoid undue exertion. Stop smoking. Adequate exercise. Watch weight.

Cardiotonics: Motherwort, Hawthorn, Mistletoe, Rosemary. Ephedra, Lily of the Valley, Broom.

Cardiac vasodilators relax tension on the vessels by increasing capacity of the arteries to carry more blood. Others contain complex glycosides that stimulate or relax the heart at its work. Garlic is strongly recommended as a preventative of CHD.

Hawthorn, vasodilator and anti-hypertensive, is reputed to dissolve deposits in thickened and sclerotic arteries BHP (1983). It is believed to regulate the balance of lipids (body fats) one of which is cholesterol.

Serenity tea. Equal parts: Motherwort, Lemon Balm, Hawthorn leaves or flowers. 1 heaped teaspoon to each cup boiling water; infuse 5-15 minutes; 1 cup freely.

Decoction. Combine equal parts: Broom, Lily of the Valley, Hawthorn. 1-2 teaspoons to each cup water gently simmered 20 minutes. Half-1 cup freely.

Tablets/capsules. Hawthorn, Motherwort, Cactus, Mistletoe, Garlic.

Practitioner. Formula. Hawthorn 20ml; Lily of the Valley 10ml; Pulsatilla 5ml; Stone root 5ml; Barberry 5ml. Tincture Capsicum 1ml. Dose: Powders: 500mg (two 00 capsules or one-third teaspoon). Liquid extracts: 1 teaspoon. Tinctures: 2 teaspoons. Thrice daily in water or honey.

Prevention: Vitamin E – 400iu daily.

Diet. See: DIET – HEART AND CIRCULATION.

Supplements. Daily. Vitamin C, 2g. Vitamin E possesses anti-clotting properties, 400iu. Broad spectrum multivitamin and mineral including chromium, magnesium selenium, zinc, copper.

Acute condition. Strict bed-rest; regulate bowels; avoid excessive physical and mental exertion. Meditation and relaxation techniques dramatically reduce coronary risk. ... coronary heart disease

Raynaud’s Disease

a condition of unknown cause in which the arteries of the fingers are unduly reactive and enter spasm (angiospasm or vasospasm) when the hands are cold. This produces attacks of pallor, numbness, and discomfort in the fingers. A similar condition (Raynaud’s phenomenon) may result from atherosclerosis, connective-tissue diseases, ingestion of ergot derivatives, or the frequent use of vibrating tools. Gangrene or ulceration of the fingertips may result from lack of blood to the affected part. Warm gloves and peripheral *vasodilators may relieve the condition. In unresponsive cases *sympathectomy is of value. [M. Raynaud (1834–81), French physician]... raynaud’s disease

Hair Loss

Alopecia. Baldness. Shedding of the hair in patches leaving glossy bald areas. It is normal to lose about one hundred hairs a day, but severe stress such as unemployment, divorce or death in a family may considerably increase hair loss. Losses of long-standing are seldom recovered.

Causes: hormone deficiency (Agnus Castus) in females, where it may be associated with failing thyroid or ovarian function. In such cases, other agents include: Helonias, Motherwort, Black Haw bark. Other causes may be pregnancy, the menopause, or simply discontinuing The Pill. Certain skin diseases predispose: ringworm (Thuja), eczema (Yellow Dock), from thyroid disorder (Kelp, Blue Flag root).

Exposure to some cosmetics, excessive sunlight, strong chemicals and treatment of cancer with cytotoxic drugs may interfere with nutrition of the hair follicles. To ensure a healthy scalp a correct mineral balance is essential calling for supplementation of the diet with vitamins, selenium, zinc and silica. Yellow Dock is believed to counter toxicity of chemicals; Pleurisy root opens the pores to promote sweat and action of surface capillaries.

Baldness sometimes happens suddenly; eye-lashes or beard may be affected. Though emotional stress and a run-down condition is a frequent cause, most cases are not permanent, returning to normal with adequate treatment.

Baldness of the eyebrows alerts us to a lowered function of the thyroid gland, being an early outward sign of myxoedema. A pony-tail hair style or the wearing of a crash helmet may cause what is known as traction alopecia. Heavy coffee drinkers invariably lose hair lustre.

Soviet Research favours silica-rich plants internally and as a lotion: Horsetail, Burdock, Nettles, Bamboo gum.

Growth of hair is assisted by improving surface circulation of the scalp which is beneficial for conveying nutrients to the hair roots and facilitating drainage. Herbal vasodilators stimulate hair follicle nutrition and encourage growth: Cayenne, Pleurisy root, Black Cohosh and Prickly Ash, taken internally. A convenient way of taking Cayenne is the use of a pepper-shaker at table.

Topical. Hair rinse. 2-3 times weekly. Infusion: equal parts Yarrow, Sage and Rosemary. 1oz (30g) to 1 pint (500ml) water. Simmer gently five minutes. Allow to cool. Strain before use.

Cider vinegar – minimal success reported.

Day lotion. Liquid Extract Jaborandi half an ounce; Tincture Cantharides half an ounce; Oil Jojoba to 4oz. Shake well before use.

Oily lotion. Equal parts Olive and Eucalyptus oils.

Bay Rhum Lotion. Oil of Bay 50 drops; Olive oil half an ounce; Rum (Jamaica or other) to 4oz. Shake well before use.

Oil Rosemary: rub into hair roots.

Russian Traditional. Castor oil half an ounce; Almond oil 1oz; Oil Geranium 15 drops; Vodka to 6oz. Rub into hair roots.

Aromatherapy. To 1oz Castor oil and 1oz Olive oil add, 10 drops each – Oils Neroli, Lavender and Rosemary.

Gentian plant extract. Japanese scalp massage with extract from roots to thicken thinning hair. Some success reported.

Supplements. B-vitamins, Kelp, Silicea Biochemic salt. Zinc. Low levels of iron and zinc can cause the condition.

Note: Studies show that male occipital baldness confers a risk of heart disease, being associated with a higher total cholesterol and diastolic blood pressure than men with a full head of hair. Frontal baldness has not been found to be associated with increased risk of coronary heart disease and myocardial infarct. “It seems prudent for bald men to be specially vigorous in controlling risk factors for such conditions.” (S.M. Lesko, Journal of the American Medical Association, Feb 24, 1993, 269: 998-1003) ... hair loss

Vasodilator

n. a drug that causes widening of the blood vessels and therefore an increase in blood flow. Vasodilators are used to lower blood pressure in cases of hypertension. Coronary vasodilators, such as *glyceryl trinitrate, increase the blood flow through the heart and are used to relieve and prevent angina. Large doses of coronary vasodilators cause such side-effects as flushing of the face, severe headache, and fainting. Peripheral vasodilators affect blood flow to the limbs; they include *alpha blockers and some *calcium-channel blockers. Certain of the latter (e.g. *nifedipine) are used to treat conditions due to poor circulation, such as Raynaud’s disease and intermittent claudication.... vasodilator



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