2011 January » Family Medicine Help

Malignant melanoma

General Medicine Comments Off

Jan 292011

Incidence of malignant melanoma, a neoplasm that arises from melanocytes, has increased by 50% in the past 20 years. In particular, an increase in incidence of melanoma in situ suggests earlier detection. The disorder varies in different populations but is about 10 times more common in white than in nonwhite populations. The four types of melanomas are superficial spreading melanoma, nodular malignant melanoma, lentigo maligna melanoma, and acral-lentiginous melanoma.

Melanoma spreads through the lymphatic and vascular systems and metastasizes to the regional lymph nodes, skin, liver, lungs, and central nervous system (CNS). Its course is unpredictable, however, and recurrence and metastasis may occur more than 5 years after resection of the primary lesion. If it spreads to regional lymph nodes, the patient has a 50% chance of survival.

The prognosis varies with tumor thickness. Generally, superficial lesions are curable, whereas deeper lesions tend to metastasize. The Breslow Level Method measures tumor depth from the granular level of the epidermis to the deepest melanoma cell. Melanoma lesions less than 0.76 mm deep have an excellent prognosis, whereas deeper lesions (more than 0.76 mm deep) are at risk for metastasis. The prognosis is better for a tumor on an extremity (which is drained by one lymphatic network) than for one on the head, neck, or trunk (which is drained by several networks).

Causes

Several factors may influence the development of melanoma:

Excessive exposure to ultraviolet light. Melanoma is most common in sunny, warm areas and commonly develops on parts of the body that are exposed to the sun. A person who has a blistering sunburn before age 20 has twice the risk of developing melanoma.
Skin type. Most persons who develop melanoma have blond or red hair, fair skin, and blue eyes; are prone to sunburn; and are of Celtic or Scandinavian descent. Melanoma is rare among blacks; when it does develop, it usually arises in lightly pigmented areas (the palms, plantar surface of the feet, or mucous membranes).
Autoimmune factors. Genetic and autoimmune effects may be causes.
Hormonal factors. Pregnancy may increase risk and exacerbate growth.
Family history. A person with a family history of melanoma has eight times the risk of Continue reading »

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Carpal tunnel syndrome

General Medicine, General Surgery Comments Off

Jan 242011

The most common of the nerve entrapment syndromes, carpal tunnel syndrome results from compression of the median nerve at the wrist, within the carpal tunnel. This nerve passes through, along with blood vessels and flexor tendons, to the fingers and thumb. Compression neuropathy causes sensory and motor changes in the median distribution of the hand.

Carpal tunnel syndrome usually occurs in women between ages 30 and 60 and poses a serious occupational health problem. Assembly-line workers and packers, secretary-typists, and persons who repeatedly use poorly designed tools are most likely to develop this disorder. Any strenuous use of the hands—ustained grasping, twisting, or flexing—aggravates this condition.

Causes

The carpal tunnel is formed by the carpal bones and the transverse carpal ligament. Inflammation or fibrosis of the tendon sheaths that pass through the carpal tunnel can cause edema and compression of the median nerve.

Many conditions can cause the contents or structure of the carpal tunnel to swell and press the median nerve against the transverse carpal ligament. Such conditions include rheumatoid arthritis, flexor tenosynovitis (commonly associated with rheumatic disease), nerve compression, pregnancy, renal failure, menopause, diabetes mellitus, acromegaly, edema following Colles’ fracture, hypothyroidism, amyloidosis, myxedema, benign tumors, tuberculosis, and other granulomatous diseases. Another source of damage to the median nerve is dislocation or acute sprain of the wrist.

Signs and symptoms

The patient with carpal tunnel syndrome usually complains of weakness, pain, burning, numbness, or tingling in the involved hands. This paresthesia affects the thumb, forefinger, middle finger, and half of the fourth finger. The patient is unable to clench his hand into a fist. The nails may be Continue reading »

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Introduction to Alcoholism

General Medicine, Psychiatry 1 Response »

Jan 242011

A chronic disorder, alcoholism is usually described as an uncontrolled intake of alcoholic beverages that interferes with physical and mental health, social and family relationships, and occupational responsibilities. Alcoholism cuts across all social and economic groups, involves both sexes, and occurs at all stages of the life cycle, beginning as early as elementary school age. About 20% of patients, even in affluent areas, have alcoholism. Lifetime risk for dependence is 10% to 15% for men and 5% for women.

Causes

Numerous biological, psychological, and sociocultural factors appear to be involved in alcohol addiction. An offspring of one alcoholic parent is seven to eight times more likely to become an alcoholic than is a peer without an alcoholic parent. Biological factors include genetic and biochemical abnormalities, nutritional deficiencies, endocrine imbalances, and allergic responses.

Psychological factors include the urge to drink alcohol to reduce anxiety or symptoms of mental illness; the desire to avoid responsibility in family, social, and work relationships; and the need to bolster self-esteem.

Sociocultural factors include the availability of alcoholic beverages, peer pressure, an excessively stressful lifestyle, and social attitudes that approve of frequent drinking.

Signs and symptoms

Because people with alcohol dependence may hide or deny their addiction and may temporarily manage to maintain a functional life, assessing a patient for alcoholism can be difficult. However, there are various physical and psychosocial symptoms that can facilitate assessment.

The patient’s history may suggest a need for daily or episodic alcohol use to maintain adequate functioning, an inability to discontinue or reduce alcohol intake, episodes of anesthesia or amnesia (blackouts) during intoxication, episodes of violence during intoxication, or interference with social and familial relationships and occupational responsibilities.

Many minor complaints that the patient may have may also be alcohol related. He may mention malaise, dyspepsia, mood swings, depression, or more infections. Note any evidence of an unusually high tolerance for sedatives and narcotics.

Secretive behavior is another indication. When confronted, the patient may deny or rationalize his problem with alcohol. Alternatively, he may be guarded or hostile in his response. He also may project his anger or feelings of guilt or inadequacy onto others to avoid confronting his illness.

With chronic alcohol abuse, the patient may experience malnutrition, cirrhosis of the liver, peripheral neuropathy, brain damage, or cardiomyopathy. Continue reading »

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