This means initially that with exercise the organs and tissues do not have an adequate blood supply. As the condition progresses the supply may not be sufficient even at rest. Cardiac failure can result if the myocardium is damaged by ischaemia, if the heart is inefficient due to valve disease or because of excessive peripheral vascular resistance and hypertension. Depending on the precipitating factors, cardiac failure can affect either side of the heart or both. Left ventricular failure can occur due to hypertension, aortic valve disease or coronary artery disease. The symptoms are pulmonary oedema and breathlessness. Right ventricular failure can occur due to chronic lung disease, pulmonary valve disease and congenital defects.

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In general, class II and III calcium channel blockers are used to treat hypertension as an alternative to diuretics. In hypertensive patients over African origin of any age calcium channels blockers or diuretics are now the drugs of first choice. Membrane stabilizers are used to treat arrhythmia. They act directly on sodium ion channels to restrict the entry of sodium ions into cardiac muscle cells. These drugs therefore act to slow the rate of depolarization, which is more marked in ectopic pacemakers, allowing the SA node to regain control of cardiac rhythm. Lidocaine is ineffective orally and its use is restricted to preventing and treating ventricular arrhythmia after myocardial infarction. (Lidocaine by virtue of the same mechanism of action is used as a local anaesthetic. Adverse effects of lidocaine are drowsiness, slurred speech, paraesthesia (pins and needles) and convulsions. Flecainide is an alternative to lidocaine for the treatment of ventricular arrhythmia and can be used orally for disabling paroxysmal atrial fibrillation. Adverse effects of flecainide are nausea, vomiting and precipitation of arrythmias.

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This interferes with the normal base pairing of guanine with cytosine and allows cross-linking of guanine with other guanine molecules in the same buy tramadol overnight delivery and opposite strand of DNA. This denatures the DNA and as a result transcription of DNA for protein synthesis and replication of DNA for cell division are disrupted. The end result is cell death by apoptosis. Although alkylating agents can act on cells at any stage of the cell cycle, they are most effective in the S phase of the cell cycle and are therefore most cytotoxic to rapidly dividing cells. Of the drugs in this group, cyclophosphamide is commonly used to treat chronic lymphocytic leukaemia, lymphoma and ovarian and testicular cancers. Cyclophosphamide produces severe nausea and is often used with a ondansetron.

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This gene codes for a protein called Ras. Mutation of the ras gene leads to production of abnormal Ras, which activates buy tramadol overnight delivery division. Mutations of the ras gene are found in It is believed that normal growth within tissues is also controlled by contact inhibition. That is, inhibition of abnormal cell division and growth by cell-to-cell contact factors called integrins and adhesion molecules. In addition, as cells are added during growth and repair, others die so overall size of a tissue or organ is maintained.

Metoclopramide is also an antiemetic, which can be useful in radiological examinations and to counteract the effects of therapeutic radiography. The antiemetic effect is due to the blocking of dopamine receptors in the chemotrigger zone of the medulla. The chemotrigger zone is sensitive to potentially harmful chemicals in blood. Adverse effects of metoclopramide include rashes and pruritis. In high dose, injection of metoclopramide can cause sedation and facial muscle spasms due to effects on dopamine receptors in the brain. This is similar to the adverse reactions seen with antipsychotic drugs.

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This means that there is a reduction in impulses passing on to other parts of the brain and this effect normally produces a reduction in anxiety and wakefulness. Benzodiazepines enhance the effects of GABA at its receptor, but they do not bring about the opening of chloride ion channels in the absence of GABA. Because of the existence of benzodiazepine receptors, it seems likely that there must be either an endogenous benzodiazepine or an endogenous anxiolytic substance, although none has been conclusively identified yet. For treatment of anxiety, benzodiazepines such as diazepam and oxazepam are used because they have a slower onset of action with a longer duration than others. Benzodiazepine anxiolytics have been prescribed to almost anyone with stress-related symptoms, unhappiness or minor physical trauma. This kind of use is now considered unsuitable.

Patients must not be taking other photosensitizing drugs, for example phenothiazines and benzodiazepines, NSAIDs and some antibiotics. Psoralens are naturally occurring plant extracts found in the parsnip family and the technique has a long history, being used by Egyptians and Indians to treat vitiligo as long ago as in the skin and photochemotherapy is still used to treat it. Psoralen causes stimulation of melanocytes and some repigmentation in vitiligo. Topical corticosteroids should not be used for long periods or on extensive areas of psoriasis because their withdrawal can produce a rebound reaction and long-term changes in skin structure. However, corticosteroids remain useful for small lesions.

A drug metabolite may have a new and completely different pharmacological activity, or it may be as active as or more active than the original drug. Some drugs have to be metabolized in order to become active. Prodrugs are drugs that have been designed to remain inactive until they have been metabolized by the body. They may be formulated in this way because the active drug is difficult to administer, whereas the inactive prodrug does not cause the same complications, or because the active drug is not absorbed or distributed to its intended site of action easily. Most tissues in the body have the enzymes capable of metabolizing a variety of substances. However, as one of the main functions of the liver is the metabolism of toxic substances produced during normal metabolic processes, it is not surprising that the majority of drug metabolism takes place in the liver.

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