Loss Of Blood: From 1 Different Sources
As a result of trauma. This is perhaps the simplest example of all, when, as a result of an accident involving a large artery, there is severe haemorrhage.
Menstruation. The regular monthly loss of blood which women sustain as a result of menstruation always puts a strain on the blood-forming organs. If this loss is excessive, then over a period of time it may lead to quite severe anaemia.
Childbirth. A considerable amount of blood is always lost at childbirth; if this is severe, or if the woman was anaemic during pregnancy, a severe degree of anaemia may develop.
Bleeding from the gastrointestinal tract. The best example here is anaemia due to ‘bleeding piles’ (see HAEMORRHOIDS). Such bleeding, even though slight, is a common cause of anaemia in both men and women if maintained over a long period of time. The haemorrhage may be more acute and occur from a DUODENAL ULCER or gastric ulcer (see STOMACH, DISEASES OF), when it is known as haematemesis.
Certain blood diseases, such as PURPURA and HAEMOPHILIA, which are characterised by bleeding.
A blood clot arises when blood comes into contact with a foreign surface – for example, damaged blood vessels – or when tissue factors are released from damaged tissue. An initial plug of PLATELETS is converted to a de?nitive clot by the deposition of FIBRIN, which is formed by the clotting cascade and erythrocytes. (See COAGULATION.)... blood clot
The number of each of the cellular components per litre of blood. It may be calculated using a microscope or by an automated process.... blood count
See TRANSFUSION – Transfusion of blood.... blood transfusion
See SEPTICAEMIA.... blood-poisoning
See BLOOD GROUPS.... abo blood groups
A department in which blood products are prepared, stored, and tested prior to transfusion into patients.... blood bank
A functional, semi-permeable membrane separating the brain and cerebrospinal ?uid from the blood. It allows small and lipid-soluble molecules to pass freely but is impermeable to large or ionised molecules and cells.... blood brain barrier
See ERYTHROCYTES and LEUCOCYTES.... blood corpuscle
An individual who donates his or her own blood for use in patients of compatible blood group who require transfusion.... blood donor
Speci?cally, this describes the measurement of the tensions of oxygen and carbon dioxide in blood. However, it is commonly used to describe the analysis of a sample of heparinised arterial blood for measurement of oxygen, carbon dioxide, oxygen saturation, pH, bicarbonate, and base excess (the amount of acid required to return a unit volume of the blood to normal pH). These values are vital in monitoring the severity of illness in patients receiving intensive care or who have severe respiratory illness, as they provide a guide to the e?ectiveness of oxygen transport between the outside air and the body tissues. Thus they are both a guide to whether the patient is being optimally ventilated, and also a general guide to the severity of their illness.... blood gases
Removal of venous, capillary or arterial blood for haematological, microbiological or biochemical laboratory investigations.... blood test
Tube through which blood is conducted from or to the heart. Blood from the heart is conducted via arteries and arterioles through capillaries and back to the heart via venules and then veins. (See ARTERIES and VEINS.)... blood vessel
People are divided into four main groups in respect of a certain reaction of the blood. This depends upon the capacity of the serum of one person’s blood to cause the red cells of another’s to stick together (agglutinate). The reaction depends on antigens (see ANTIGEN), known as agglutinogens, in the erythrocytes and on ANTIBODIES, known as agglutinins, in the serum. There are two of each, the agglutinogens being known as A and B. A person’s erythrocytes may have (1) no agglutinogens, (2) agglutinogen A, (3) agglutinogen B, (4) agglutinogens A and B: these are the four groups. Since the identi?cation of the ABO and Rhesus factors (see below), around 400 other antigens have been discovered, but they cause few problems over transfusions.
In blood transfusion, the person giving and the person receiving the blood must belong to the same blood group, or a dangerous reaction will take place from the agglutination that occurs when blood of a di?erent group is present. One exception is that group O Rhesus-negative blood can be used in an emergency for anybody.
| Agglutinogens | Agglutinins | Frequency |
| in the | in the | in Great |
| Group | erythrocytes | plasma | Britain |
| AB | A and B | None | 2 per cent |
| A | A | Anti-B | 46 per cent |
| B | B | Anti-A | 8 per cent |
| O | Neither | Anti-A and | 44 per cent |
| A nor B | Anti-B | |
| | | |
Rhesus factor In addition to the A and B agglutinogens (or antigens), there is another one known as the Rhesus (or Rh) factor – so named because there is a similar antigen in the red blood corpuscles of the Rhesus monkey. About 84 per cent of the population have this Rh factor in their blood and are therefore known as ‘Rh-positive’. The remaining 16 per cent who do not possess the factor are known as ‘Rh-negative’.
The practical importance of the Rh factor is that, unlike the A and B agglutinogens, there are no naturally occurring Rh antibodies. However, such antibodies may develop in a Rh-negative person if the Rh antigen is introduced into his or her circulation. This can occur (a) if a Rh-negative person is given a transfusion of Rh-positive blood, and (b) if a Rh-negative mother married to a Rh-positive husband becomes pregnant and the fetus is Rh-positive. If the latter happens, the mother develops Rh antibodies which can pass into the fetal circulation, where they react with the baby’s Rh antigen and cause HAEMOLYTIC DISEASE of the fetus and newborn. This means that, untreated, the child may be stillborn or become jaundiced shortly after birth.
As about one in six expectant mothers is Rh-negative, a blood-group examination is now considered an essential part of the antenatal examination of a pregnant woman. All such Rh-negative expectant mothers are now given a ‘Rhesus card’ showing that they belong to the rhesus-negative blood group. This card should always be carried with them. Rh-positive blood should never be transfused to a Rh-negative girl or woman.... blood groups
A procedure performed during a mother’s labour in which a blood sample is taken from a vein in the scalp of the FETUS. This enables tests to be performed that indicate whether the fetus is, for example, suffering from a shortage of oxygen (HYPOXIA). If so, the obstetrician will usually accelerate the baby’s birth.... fetal blood sampling
See ERYTHROCYTES; BLOOD.... red blood cell
See LEUCOCYTES.... white blood cell
See blood glucose.... blood sugar
See TRANSFUSION – Transfusion of blood.... autologous blood transfusion
See VENESECTION.... blood-letting
See ANAEMIA; LEUKAEMIA; LYMPHOMA; MYELOMATOSIS; THROMBOSIS.... blood, diseases of
Love, Protection, Purification... bloodroot
Love, Protection, Exorcism, Potency... dragons blood
This body manages regional TRANSFUSION centres. Among its aims are the maintenance and promotion of blood and blood products based on a system of voluntary donors; implementing a cost-e?ective national strategy for ensuring adequate supplies of blood and its products to meet national needs; and ensuring high standards of safety and quality.... national blood authority
The course of the circulation is as follows: the veins pour their blood, coming from the head, trunk, limbs and abdominal organs, into the right atrium of the HEART. This contracts and drives the blood into the right ventricle, which then forces the blood into the LUNGS by way of the pulmonary artery. Here it is contained in thin-walled capillaries, over which the air plays freely, and through which gases pass readily out and in. The blood gives o? carbon dioxide (CO2) and takes up oxygen (see RESPIRATION), and passes on by the pulmonary veins to the left atrium of the heart. The left atrium expels it into the left ventricle, which forces it on into the aorta, by which it is distributed all over the body. Passing through capillaries in the various tissues, it enters venules, then veins, which ultimately unite into two great veins, the superior and the inferior vena cava, these emptying into the right atrium. This complete circle is accomplished by any particular drop of blood in about half a minute.
In one part of the body there is a further complication. The veins coming from the bowels, charged with food material and other products, split up, and their blood undergoes a second capillary circulation through the liver. Here it is relieved of some food material and puri?ed, and then passes into the inferior vena cava, and so to the right atrium. This is known as the portal circulation.
The circle is maintained always in one direction by four valves, situated one at the outlet from each cavity of the heart.
The blood in the arteries going to the body generally is bright red, that in the veins dull red in colour, owing to the former being charged with oxygen and the latter with carbon dioxide (see RESPIRATION). For the same reason the blood in the pulmonary artery is dark, that in the pulmonary veins is bright. There is no direct communication between the right and left sides of the heart, the blood passing from the right ventricle to the left atrium through the lungs.
In the embryo, before birth, the course of circulation is somewhat di?erent, owing to the fact that no nourishment comes from the bowels nor air into the lungs. Accordingly, two large arteries pass out of the navel, and convey blood to be changed by contact with maternal blood (see PLACENTA), while a large vein brings this blood back again. There are also communications between the right and left atria, and between pulmonary artery and aorta. The latter is known as the ductus arteriosus. At birth all these extra vessels and connections close and rapidly shrivel up.... circulatory system of the blood
These have almost completely replaced BONE MARROW TRANSPLANT, used to treat malignancies such as LEUKAEMIA and LYMPHOMA for the past 20 years. The high doses of CHEMOTHERAPY or RADIOTHERAPY used to treat these diseases destroy the bone marrow which contains stem cells from which all the blood cells derive. In 1989 stem cells were found in the blood during recovery from chemotherapy. By giving growth factors (cytokines), the number of stem cells in the blood increased for about three to four days. In a peripheral-blood stem-cell transplant, these cells can be separated from the peripheral blood, without a general anaesthetic. The cells taken by either method are then frozen and returned intravenously after the chemotherapy or radiotherapy is completed. Once transplanted, the stem cells usually take less than three weeks to repopulate the blood, compared to a month or more for a bone marrow transplant. This means that there is less risk of infection or bleeding during the recovery from the transplant. The whole procedure has a mortality risk of less than 5 per cent – half the risk of a bone marrow transplant.... peripheral-blood stem-cell transplants
See: BLEEDING (haemoptysis). ... coughing of blood
Popular blood tonic of the 1930s, 1940s and 1950s. Ingredients: Liquid Extract Liquorice 5 per cent, Infusion Gentian Co Conc 10 per cent, Infusion Senna Conc 5 per cent. And 25 per cent alcoholic extractive from Burdock 5 per cent, Red Clover 5 per cent, Queen’s root 2.5 per cent, Yellow Dock root 1.25 per cent, Poke root 2.5 per cent, Sarsaparilla 2.5 per cent. (Carter Bros) ... glentona herbal blood purifier
Loss of appetite is usually temporary and due to an emotional upset or minor illness. Persistent loss of appetite may have a more serious underlying cause, such as chronic infection or cancer.... appetite, loss of
Tests to screen for and diagnose bleeding disorders, usually resulting from deficiencies or abnormalities of blood coagulation factors or of platelets (see blood clotting). Tests are also used to monitor treatment with anticoagulant drugs.... blood-clotting tests
See culture.... blood culture
The level of glucose in the blood. Abnormally high blood glucose (sometimes called sugar) levels are an indication of diabetes mellitus. (See also hyperglycaemia; hypoglycaemia.)... blood glucose
See blood film.... blood smear
The use of a person’s own blood, donated earlier, for blood transfusion. Autologous transfusion eliminates the slight but serious risk of contracting a serious infectious illness from contaminated blood. There is no risk of a transfusion reaction occurring as a result of incompatibility between donor and recipient blood. Up to 3.5 litres of blood can be removed and stored in several sessions at least 4 days apart and up to 3 days before planned surgery. Blood may be salvaged during surgery, filtered and returned to the circulation, reducing the need for transfusion of donated blood.... blood transfusion, autologous
If you’ve decided to go on a diet in order to lose weight, you have to be careful with what you drink and eat. Sodas and some juices are a definite no, and while you can drink water all the time, it might get a bit dull. If you want to try something different, and especially pleasant to the taste, tea’s the best choice. Find out more about the perfect teas for weight loss.
Benefits of tea for weight loss
If you drink your tea simple, without sugar, then you’ll enjoy a hot beverage with 0 calories. This at least prevents you from gaining weight.
However, based on the effect one type of tea may have on the digestive system, drinking tea can even help you lose weight. From green tea to oolong tea, each has its own health benefits which help you when you’re on a diet.
Types of tea for weight loss
First of all, green tea is perfect when you’re on a diet. Among its active constituents, green tea has catechin polyphenols, which is quite useful when you want to lose weight. Thanks to this, drinking green tea will increase thermogenesis (the amount of calories which are burned) and fat oxidation. You can drink 4-5 cups of tea a day.
Oolong tea is also helpful if you’re on a diet. It even has a stronger effect than green tea, by speeding up the body’s metabolism and promoting fat burning. If you include it in your diet, don’t drink more than two cups a day.
Peppermint tea is included on the list of teas you can drink while on a diet. Besides the fact that it promotes a good digestion, it helps you burn calories as it speeds up the digestive process.
Other teas that help you lose weight include star anise tea, rose petal tea, as well as various types of herbal teas.
Tea Steeping Time
Steeping time varies from one type of tea to another. If you use teabags, follow the instructions written on the box. If you use dried leaves to make your tea for weight loss, then here are a few steeping instructions.
If you’re drinking green tea, it’s best that you let it steep for about 3 minutes. Steeping time for oolong tea can vary from one minute to 5, based on how strong you want the tea’s flavor to be. And as for peppermint tea, you should let it steep for about 4-5 minutes.
Tips to sweeten your diet tea
If you want to sweeten your tea even when on a diet, you mustn’t use sugar or milk, even if you like those the best. While they won’t add weight, they also won’t help you lose it.
The best solution, in this case, is for you to use honey. Other things you can use to sweeten it are fruit juices (especially lemon juice) and stevia leaves. Based on your preferences and the taste of the tea you choose, you can even combine them.
Caffeine in tea and weight loss
The caffeine found in various types of tea also helps you lose weight. Caffeine acts as a stimulant; therefore it gives you more energy. The more energetic you feel, the more you’re bound to exercise in order to burn more fats. Also, as it acts as a stimulant, it can help reduce your appetite.
Caffeine might not be the only stimulant you’ll find in teas. Other stimulants include ginseng, taurine, and guarnine.
Side effects related to weight loss tea
People who know coffee doesn’t do them good should be careful with teas that contain caffeine. It can cause unpleasant side effects, such as insomnia, anxiety, headache, dizziness, irritability, blurred vision and skin rashes. When you combine your diet tea with a different alimentation and exercising, the side effects might become more unpleasant.
Also, make sure you check the amount of tea that’s recommended for drinking. You can have 4-5 cups of green tea per day, while in the case of oolong tea, it is advised that you drink two cups. The amount varies from one tea to another.
Now, drinking tea for weight loss sounds like a tempting idea. Considering how helpful tea can be when you’re trying to lose weight, make sure you pick one when you go on a diet.... drink tea for weight loss
As a natural beverage, a cup of tea brings you many health benefits. One of them is related to blood pressure. Based on the type of tea you drink, it can help lower your blood pressure. Find out more about teas for blood pressure!
Problems with blood pressure
Blood pressure represents the pressure made by the circulating blood on the walls of the blood vessels. However, problems appear in the case of hypertension and hypotension.
Hypertension is a medical condition caused by a high blood pressure, while hypotension is caused by a low blood pressure. Both can be treated with one of the various types of tea for blood pressure.
Tea for high blood pressure
If you’ve got problems with hypertension (high blood pressure), hibiscus tea can help, as it is known to lower blood pressure. You can also pick one of these herbal teas: chrysanthemum tea, flax tea, periwinkle tea, red root tea, self-heal tea, white peony root tea, valerian tea, or wild cherry bark tea.
You can also drink hyssop tea, barberry tea, and rosemary tea, regardless of the blood pressure problem. These three teas will help regulate your blood pressure and reduce the risk of getting either high or low blood pressure problems.
Tea for low blood pressure
In the case of hypotension (low blood pressure), some of the teas you can try include lovage tea, ephedra tea, wu yi tea, cat’s claw tea, vervain tea, or wheatgrass tea. Black tea can help too, though you have to be careful with it as it has a high content of caffeine.
Forbidden teas for blood pressure problems
There are several teas which you should avoid drinking, no matter if you’ve got problems with high blood pressure or low blood pressure. The list of teas you shouldn’t drink includes arnica tea, black cohosh tea, gentian tea, juniper tea, lobelia tea, red ginseng tea, sage tea, stone root tea, and yohimbe tea.
Also, generally it isn’t recommended to drink tea that lowers blood pressure if you’ve got hypotension, or tea that leads to high blood pressure if you’ve got hypertension.
Whether you’ve got problems with high blood pressure or low blood pressure, try a more natural treatment: choose one of the many teas for blood pressure!... tea for blood pressure
A general term given to arteries, veins, and capillaries (see circulatory system).... blood vessels
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
The main mechanism by which blood clots are formed, involving a complex series of reactions in the blood plasma (see blood clotting).... coagulation, blood
See faeces, abnormal; rectal bleeding.... faeces, blood in the
See amnesia.... memory, loss of
The presence in the faeces of blood that cannot be seen by the naked eye, but can be detected by chemical tests. Such tests are widely used in screening for cancer of the colon (see colon, cancer of). Faecal occult blood may also be a sign of a gastrointestinal disorder such as oesophagitis, gastritis, or stomach cancer; cancer of the intestine (see intestine, cancer of); rectal cancer (see rectum, cancer of); diverticular disease; polyps in the colon; ulcerative colitis; or irritation of the stomach or intestine by drugs such as aspirin. (See also rectal bleeding.)... occult blood, faecal
Cells, also called blood corpuscles, present in blood for most or part of their lifespan. They include red blood cells, which make up about 45 per cent by volume of normal blood, white blood cells, and platelets. Blood cells are made in the bone marrow by a series of divisions from stem cells.
Red blood cells (also known as RBCs, red blood corpuscles, or erythrocytes) transport oxygen from the lungs to the tissues (see respiration). Each is packed with haemoglobin, enzymes, minerals, and sugars. Abnormalities can occur in the rate at which RBCs are either produced or destroyed, in their numbers, and in their shape, size, and haemoglobin content, causing forms of
anaemia and polycythaemia (see blood, disorders of).
White blood cells (also called WBCs, white blood corpuscles, or leukocytes) protect the body against infection and fight infection when it occurs. The 3 main types of are granulocytes (also called polymorphonuclear leukocytes), monocytes, and lymphocytes. Granulocytes are further classified as neutrophils, eosinophils, or basophils, and each type of granulocyte has a role in either fighting infection or in inflammatory or allergic reactions. Monocytes and lymphocytes also play an important part in the immune system. Lymphocytes are usually formed in the lymph nodes. One type, a T-lymphocyte, is responsible for the delayed hypersensitivity reactions
White (see allergy) and Red blood blood cell is also involved in cell (neutrophil) protection against cancer. T-lymphocytes manufacture chemicals, known as lymphokines, which affect the function of other cells. In addition, the T-cells moderate the activity of B-lymphocytes, which form the antibodies that can prevent a second attack of certain infectious diseases. Platelets (also known as thrombocytes), are the smallest blood cells and are important in blood clotting.
The numbers, shapes, and appearance of the various types of blood cell are of great value in the diagnosis of disease (see blood count; blood film).... blood cells
Disorders resulting from abnormalities in any of the components of blood or from infection. Disorders include types of anaemia, polycythaemia, bleeding disorders, and unwanted clot formation (thrombosis), hypoalbuminaemia (albumin deficiency) and agammaglobulinaemia (deficiency of gamma-globulin). Blood disorders such as sickle cell anaemia, thalassaemia, and haemophilia are inherited. Bone marrow cancers that affect production of blood components include leukaemia, polycythaemia vera, and multiple myeloma. Blood poisoning is usually due to septicaemia or a toxin such as carbon monoxide. Some drugs can cause blood abnormalities as a side effect. (See also anaemia, haemolytic; anaemia, iron-deficiency; anaemia, megaloblastic; malaria; hyperbilirubinaemia.)... blood, disorders of
Inability to speak normally. Temporary partial loss of voice commonly results from straining of the muscles of the larynx through overuse of the voice or from inflammation of the vocal cords in laryngitis. Persistent or recurrent voice loss may be due to polyps on the vocal cords, thickening of the cords in hypothyroidism, or interference with the nerve supply to the larynx muscles due to cancer of the larynx, thyroid gland, or oesophagus. Total loss of voice is rare and is usually of psychological origin. (See also hoarseness; larynx, disorders of.)... voice, loss of
Analysis of a sample of blood to give information on its cells and proteins and any of the chemicals, antigens, antibodies, and gases that it carries. Such tests can be used to check on the health of major organs, as well as on respiratory function, hormonal balance, the immune system, and metabolism. Blood tests may look at numbers, shape, size, and appearance of blood cells and assess the function of clotting factors. The most important tests are blood count and blood group tests if transfusion is needed. Biochemical tests measure chemicals in the blood (see acid–base balance; kidney function tests; liver function tests). Microbiological tests (see immunoassay) look for microorganisms that are in the blood, as
in septicaemia. Microbiology also looks for antibodies in the blood, which may confirm immunity to an infection. blood transfusion The infusion of large volumes of blood or blood products directly into the bloodstream to remedy severe blood loss or to correct chronic anaemia. In an exchange transfusion, nearly all of the recipient’s blood is replaced by donor blood. Before a transfusion, a sample of the recipient’s blood is taken to identify the blood groups, and it is matched with suitable donor blood. The donor blood is transfused into an arm vein through a plastic cannula. Usually, each unit (about 500 ml) of blood is given over 1–4 hours; in an emergency, 500 ml may be given in a couple of minutes. The blood pressure, temperature, and pulse are monitored during the procedure.
If mismatched blood is accidentally introduced into the circulation, antibodies in the recipient’s blood may cause donor cells to burst, leading to shock or kidney failure. Less severe reactions can produce fever, chills, or a rash. Reactions can also occur as a result of an allergy to transfused blood components. All
blood used for transfusion is carefully screened for a number of infectious agents, including HIV (the AIDS virus) and hepatitis B and hepatitis C.
In elderly or severely anaemic patients, transfusion can overload the circulation, leading to heart failure.
In patients with chronic anaemia who need regular transfusion over many years, excess iron may accumulate (haemosiderosis) and damage organs such as the heart, liver, and pancreas.
Treatment with desferrioxamine to remove excess iron may be needed.... blood tests
(blood corpuscle) any of the cells that are present in the blood in health or disease. The cells may be subclassified into three major categories, namely red cells (*erythrocytes); white cells (*leucocytes), which include granulocytes, lymphocytes, and monocytes; and *platelets (see illustration). The blood cells account for approximately 40% of the total volume of the blood in health; red cells comprise the vast majority.... blood cell
Blood group of people donor can receive blood from... donor’s blood group
... blood plasma see plasma.
see serum.... blood serum
(FOBT) a noninvasive test used to identify microscopic blood (see occult) in faeces. It is widely used as a screening test for colorectal cancer.... faecal occult blood test
see Guthrie test.... heel-prick blood test
n. no longer having some valued aspect of one’s life, such as a relationship, a job, or a home, that one has previously enjoyed. This may have health consequences: shock, disbelief, and emotional numbness may be followed by anger, guilt, anxiety, or profound sadness. Such emotions may lead to behavioural changes or symptoms that bring people to health care. Encouraging the patient to talk about the loss will require *empathy, sensitivity, and *judgment from the professional, both to obtain the history of the events and to provide helpful advice and direction to assist in adjustment. See also bereavement.... loss
(blood clotting) the process whereby blood is converted from a liquid to a solid state. The process may be initiated by contact of blood with a foreign surface (intrinsic system) or with damaged tissue (extrinsic system). These systems involve the interaction of a variety of substances (*coagulation factors) and lead to the production of the enzyme thrombin, which converts the soluble blood protein *fibrinogen to the insoluble protein *fibrin, forming the blood clot. Finally, fibrin is broken down by the action of *plasmin. Anticoagulants and tissue plasminogen activators act by inhibiting or activating various pathways in this cascade (see illustration). Blood coagulation is an essential mechanism for the arrest of bleeding (*haemostasis). See also platelet activation.... blood coagulation
haemopoietic *stem cells collected from umbilical cord blood donated at birth, which can be stored indefinitely and used if a sibling or any other blood-compatible baby develops an illness (such as leukaemia) that could only be treated by cord-blood stem-cell transplantation. This facility is now available in the UK and the USA.... umbilical cord blood banked stem cells
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