Showing posts with label and. Show all posts
Showing posts with label and. Show all posts

Monday, May 31, 2010

How Much Do You Know About This 'Superbug'?


How Much Do You Know About This 'Superbug'?




This tiny cluster of bacteria is methicillin-resistant Staphylococcus aureus (MRSA), seen under a microscope. This strain of the common "staph" bacteria causes infections in different parts of the body - including the skin, lungs, and other areas. MRSA is sometimes called a "superbug" because it is resistant to many antibiotics. Though most MRSA infections aren't serious, some can be life-threatening.

Saturday, May 22, 2010

Osteoporosis

Osteoporosis


Osteoporosis is a disease characterized by low bone mass and loss of bone tissue that may lead to weak and fragile bones. If you have osteoporosis, you have an increased risk for fractured bones (broken bones).

Sunday, May 16, 2010

Skin Problems


Skin Problems



Shingles: An acute infection caused by the herpes zoster virus, the same virus as causes chickenpox. Shingles is most common after the age of 50 and the risk rises with advancing age. Shingles occurs because of exposure to chickenpox or reactivation of the herpes zoster virus. The virus remains latent (dormant) in nerve roots for many years following chickenpox.

Shingles is an extraordinarily painful condition that involves inflammation of sensory nerves. It causes numbness, itching or pain followed by the appearance of clusters of littles blisters in a strip pattern on one side of the body. The pain can persist for weeks, months or years after the rash heals and is then known as post-herpetic neuralgia.

People with shingles are contagious to persons who have not had chickenpox and can catch chickenpox from close contact with a person who has shingles. Treatment includes antiviral medication and pain medication.

The term shingles has nothing to do with a shingle on a roof or the small signboard outside the office of a doctor but is derived from the Latin cingulum meaning girdle, the idea being that shingles often girdles part of the body.

Friday, May 14, 2010

Depression


Depression




Depression Tips Slideshow Pictures of Depression Tips for Exercise, Diet and Stress Reduction
Myths About Depression Quiz
Depressed? Feel Better: 8 Important Steps

Medical Authors: Roxanne Dryden-Edwards, MD, and Dennis Lee, MD
Medical Editor: William C. Shiel Jr., MD, FACP, FACR

* What is a depressive disorder?
* What are myths about depression?
* What are the types of depression and their symptoms?
* Major depression
* Dysthymia
* Bipolar disorder (manic depression)
* Symptoms of bipolar disorder and mania
* Depression symptoms of manic depression
* Mania symptoms of manic depression
* What are the causes of depression?
* Postpartum depression
* How is depression diagnosed?
* What treatments are available for depression?
* Antidepressant medications
* Electroconvulsive therapy (ECT)
* Psychotherapies
* What is the general approach to treating depression?
* What about sexual dysfunction related to antidepressants?
* What about discontinuing antidepressants?
* What about self-help?
* How can someone help a person who is depressed?
* Where can one seek help for depression?
* What is in the future for depression?
* Where can people find more information about depression?
* Depression At A Glance
* Depression Tips - Slideshow View Depression Tips for Recovering Slideshow
* Myths About Depression Quiz
* Depressed? Feel Better: 8 Important Steps
* Patient Discussions: Depression - Effective Treatments
* Find a local Psychiatrist in your town

Depression
What are the causes of depression?

Read about causes of depression.Some types of depression run in families, indicating that a biological vulnerability to depression can be inherited. This seems to be the case, especially with bipolar disorder. Families in which members of each generation develop bipolar disorder have been studied. The investigators found that those with the illness have a somewhat different genetic makeup than those who do not become ill. However, the reverse is not true. That is, not everybody with the genetic makeup that causes vulnerability to bipolar disorder will develop the illness. Apparently, additional factors, possibly a stressful environment, are involved in its onset and protective factors are involved in its prevention.

Major depression also seems to occur in generation after generation in some families, although not as strongly as in bipolar I or II. Indeed, major depression can also occur in people who have no family history of depression.

An external event often seems to initiate an episode of depression. Thus, a serious loss, chronic illness, difficult relationship, financial problem, or any unwelcome change in life patterns can trigger a depressive episode. Very often, a combination of genetic, psychological, and environmental factors is involved in the onset of a depressive disorder. Stressors that contribute to the development of depression sometimes affect some groups more than others. For example, minority groups who more often feel impacted by discrimination and are disproportionately represented. Socioeconomically disadvantaged groups have higher rates of depression compared to their advantaged counterparts. Immigrants to the United States may be more vulnerable to developing depression, particularly when isolated by language.

Learn more about depression causes »

What is a depressive disorder?

Depressive disorders have been with mankind since the beginning of recorded history. In the Bible, King David, as well as Job, suffered from this affliction. Hippocrates referred to depression as melancholia, which literally means black bile. Black bile, along with blood, phlegm, and yellow bile were the four humors (fluids) that described the basic medical physiology theory of that time. Depression, also referred to as clinical depression, has been portrayed in literature and the arts for hundreds of years, but what do we mean today when we refer to a depressive disorder? In the 19th century, depression was seen as an inherited weakness of temperament. In the first half of the 20th century, Freud linked the development of depression to guilt and conflict. John Cheever, the author and a modern sufferer of depressive disorder, wrote of conflict and experiences with his parents as influencing his development of depression.

In the 1950s and '60s, depression was divided into two types, endogenous and neurotic. Endogenous means that the depression comes from within the body, perhaps of genetic origin, or comes out of nowhere. Neurotic or reactive depression has a clear environmental precipitating factor, such as the death of a spouse, or other significant loss, such as the loss of a job. In the 1970s and '80s, the focus of attention shifted from the cause of depression to its effects on the afflicted people. That is to say, whatever the cause in a particular case, what are the symptoms and impaired functions that experts can agree make up a depressive disorder? Although there is some argument even today (as in all branches of medicines), most experts agree on the following:

1. A depressive disorder is a syndrome (group of symptoms) that reflects a sad and/or irritable mood exceeding normal sadness or grief. More specifically, the sadness of depression is characterized by a greater intensity and duration and by more severe symptoms and functional disabilities than is normal.


2. Depressive signs and symptoms are characterized not only by negative thoughts, moods, and behaviors but also by specific changes in bodily functions (for example, crying spells, body aches, low energy or libido, as well as problems with eating, weight, or sleeping). The functional changes of clinical depression are often called neurovegetative signs. This means that the nervous system changes in the brain cause many physical symptoms that result in diminished participation and a decreased or increased activity level.


3. Certain people with depressive disorder, especially bipolar depression (manic depression), seem to have an inherited vulnerability to this condition.


4. Depressive disorders are a huge public-health problem, due to its affecting millions of people. About 10% of adults, up to 8% of teens and 2% of preteen children experience some kind of depressive disorder.

o The statistics on the costs due to depression in the United States include huge amounts of direct costs, which are for treatment, and indirect costs, such as lost productivity and absenteeism from work or school.


o Adolescents who suffer from depression are at risk for developing and maintaining obesity.


o In a major medical study, depression caused significant problems in the functioning of those affected more often than did arthritis, hypertension, chronic lung disease, and diabetes, and in some ways as often as coronary artery disease.


o Depression can increase the risks for developing coronary artery disease, HIV, asthma, and many other medical illnesses. Furthermore, it can increase the morbidity (illness/negative health effects) and mortality (death) from these and many other medical conditions.


o Depression can coexist with virtually every other mental health illness, aggravating the status of those who suffer the combination of both depression and the other mental illness.


o Depression in the elderly tends to be chronic, has a low rate of recovery, and is often undertreated. This is of particular concern given that elderly men, particularly elderly white men have the highest suicide rate.

5. Depression is usually first identified in a primary-care setting, not in a mental health practitioner's office. Moreover, it often assumes various disguises, which causes depression to be frequently underdiagnosed.


6. In spite of clear research evidence and clinical guidelines regarding therapy, depression is often undertreated. Hopefully, this situation can change for the better.


7. For full recovery from a mood disorder, regardless of whether there is a precipitating factor or it seems to come out of the blue, treatment with medication and/or electroconvulsive therapy (ECT) (see discussion below) and psychotherapy are necessary.

Monday, May 10, 2010

Skin Problems


Skin Problems




is a type of hair loss that occurs when your immune system mistakenly attacks hair follicles, which is where hair growth begins. The damage to the follicle is usually not permanent. Experts do not know why the immune system attacks the follicles. Alopecia areata is most common in people younger than 20, but children and adults of any age may be affected. Women and men are affected equally.

Alopecia areata cannot be "cured" but it can be treated. Most people who have one episode will have more episodes of hair loss. Read more about alopecia areata.

Saturday, May 8, 2010

: Skin Problems


: Skin Problems



Excessive exposure to sunlight is the main cause of skin cancer. Sunlight contains ultraviolet (UV) rays that can alter the genetic material in skin cells, causing mutations. Sunlamps, tanning booths, and X-rays also generate UV rays that can damage skin and cause malignant cell mutations. Basal cell carcinoma and squamous cell carcinoma have been linked to chronic sun exposure, typically in fair-skinned people who work outside. Melanoma is associated with infrequent but excessive sunbathing that causes scorching sunburn. One blistering sunburn during childhood appears to double a person's risk for developing melanoma later in life.

Image Source: Left: 2007 Interactive Medical Media LLC. All rights reserved. Right top and bottom: Copyright © ISM / Phototake -- All rights reserved.

Monday, May 3, 2010

Swine Flu (Swine Influenza A [H1N1] Virus)


Swine Flu
(Swine Influenza A [H1N1] Virus)



Swine flu (swine influenza) is a respiratory disease caused by viruses (influenza viruses) that infect the respiratory tract of pigs and result in nasal secretions, a barking-like cough, decreased appetite, and listless behavior. Swine flu produces most of the same symptoms in pigs as human flu produces in people. Swine flu can last about one to two weeks in pigs that survive. Swine influenza virus was first isolated from pigs in 1930 in the U.S. and has been recognized by pork producers and veterinarians to cause infections in pigs worldwide. In a number of instances, people have developed the swine flu infection when they are closely associated with pigs (for example, farmers, pork processors), and likewise, pig populations have occasionally been infected with the human flu infection. In most instances, the cross-species infections (swine virus to man; human flu virus to pigs) have remained in local areas and have not caused national or worldwide infections in either pigs or humans. Unfortunately, this cross-species situation with influenza viruses has had the potential to change. Investigators think the 2009 swine flu strain, first seen in Mexico, should be termed novel H1N1 flu since it is mainly found infecting people and exhibits two main surface antigens, H1 (hemagglutinin type 1) and N1 (neuraminidase type1). Recent investigations show the eight RNA strands from novel H1N1 flu have one strand derived from human flu strains, two from avian (bird) strains, and five from swine strains.

Why is swine flu (H1N1) now infecting humans?

Many researchers now consider that two main series of events can lead to swine flu (and also avian or bird flu) becoming a major cause for influenza illness in humans.

First, the influenza viruses (types A, B, C) are enveloped RNA viruses with a segmented genome; this means the viral RNA genetic code is not a single strand of RNA but exists as eight different RNA segments in the influenza viruses. A human (or bird) influenza virus can infect a pig respiratory cell at the same time as a swine influenza virus; some of the replicating RNA strands from the human virus can get mistakenly enclosed inside the enveloped swine influenza virus. For example, one cell could contain eight swine flu and eight human flu RNA segments. The total number of RNA types in one cell would be 16; four swine and four human flu RNA segments could be incorporated into one particle, making a viable eight RNA segmented flu virus from the 16 available segment types. Various combinations of RNA segments can result in a new subtype of virus (known as antigenic shift) that may have the ability to preferentially infect humans but still show characteristics unique to the swine influenza virus (see Figure 1). It is even possible to include RNA strands from birds, swine, and human influenza viruses into one virus if a cell becomes infected with all three types of influenza (for example, two bird flu, three swine flu, and three human flu RNA segments to produce a viable eight-segment new type of flu viral genome). Formation of a new viral type is considered to be antigenic shift; small changes in an individual RNA segment in flu viruses are termed antigenic drift and result in minor changes in the virus. However, these can accumulate over time to produce enough minor changes that cumulatively change the virus' antigenic makeup over time (usually years).

Second, pigs can play a unique role as an intermediary host to new flu types because pig respiratory cells can be infected directly with bird, human, and other mammalian flu viruses. Consequently, pig respiratory cells are able to be infected with many types of flu and can function as a "mixing pot" for flu RNA segments (see Figure 1). Bird flu viruses, which usually infect the gastrointestinal cells of many bird species, are shed in bird feces. Pigs can pick these viruses up from the environment and seem to be the major way that bird flu virus RNA segments enter the mammalian flu virus population.
Picture of antigenic shift and antigenic drift in swine flu (H1N1).

Tuesday, April 6, 2010

Bocavirus Infection



Bocavirus Infection



Bocavirus (also termed HBoV or human bocavirus) is a small (20 nm in size) non-enveloped virus with a single strand of DNA that comprises its genome. The bocavirus genus is a member of the Parvoviridae family, and to date, three strains have been identified: HBoV, HBoV-2, and HBoV-3. Bocavirus is a new viral genus that was discovered in 2005 in upper respiratory secretions from acutely ill children. The name bocavirus was derived by combining the names bovine parvovirus with canine minutevirus with which bocavirus shares some genetic and structural characteristics. The ICTVdB (International Committee on Taxonomy of Viruses database) has detailed its genome and structure.

Although this virus has been found worldwide in humans and animals, there is ongoing research and discussion about this virus as being a pathogen that causes infection, either alone or in conjunction with other virus types. Many investigators consider this newly discovered virus genus as an "emerging viral pathogen" because it is only proven to be associated with infections but not yet proven to be a cause of them, either alone or in conjunction with other viruses. However, another member of the Parvoviridae family, a parvovirus termed B19, causes erythema infectiosum (fifth disease or "slapped cheek" syndrome), hydrops fetalis (severe anemia in pregnant women), and aplastic crisis (cessation of red blood cell production) in individuals that have sickle cell disease. Bocavirus has not been associated with these conditions caused by parvovirus B19.

What are the symptoms and signs of bocavirus infection?

Because bocavirus is usually only found in individuals (usually infants, children, and infrequently in young adults) with lower respiratory infections or diarrhea, these are the following symptoms and signs associated with the presence of bocavirus:

* ARTI (also termed RTIs, acute respiratory tract infections), especially in infants and children


* Cough


* Wheezing


* Fever


* Cyanosis (bluish or grayish tint to skin due to lack of oxygen)


* Rhinorrhea (runny nose)


* Diarrhea


* Vomiting

The infants and children with these nonspecific symptoms often are very ill and require hospitalization. It is important to note that it is not clear yet that bocavirus is either completely or partially responsible for these signs and symptoms. Currently, most of the clinical articles that discuss bocavirus describe patients with at least several of the symptoms and signs listed above, with pneumonia as the major problem. One study found bocavirus rarely associated with patients with COPD (chronic obstructive pulmonary or respiratory disease) so the authors suggest it has no role in COPD. Some investigators report months of bocavirus shedding (having tests demonstrate the presence of the virus in body secretions) in patients with cancer (leukemia), but the significance of this shedding is not clear.

Friday, April 2, 2010

Nibble on Chocolate for a Healthier Heart

Nibble on Chocolate for a Healthier Heart



By Jennifer Warner
WebMD Health News

Reviewed By Laura J. Martin, MD

March 30, 2010 -- Just in time for the Easter Bunny's arrival, researchers have more sweet news about chocolate and heart disease.

A new study suggests that eating a small piece of chocolate every day may reduce your risk of heart attack and stroke.

Researchers in Germany say that people who ate the equivalent of one square of a 100 gram (3.5 oz) chocolate bar per day had a 39% lower risk of having heart attack or stroke than people who ate much less chocolate.

But before you stock up on chocolate Easter eggs, researchers warn that the key to reaping the health benefits of chocolate is moderation. A single 100-gram bar of chocolate contains about 500 calories, and eating too much can contribute to unhealthy weight gain.

"Small amounts of chocolate may help to prevent heart disease, but only if it replaces other energy-dense food, such as snacks, in order to keep body weight stable," researcher Brian Buijsse, a nutritional epidemiologist at the German Institute of Human Nutrition in Nuthetal, Germany, says in a news release.
Chocolate and Heart Attack Risk

The study, published in the European Heart Journal, followed 19,357 adults for 10 years. The participants received medical checkups at the start of the study in 1994-1998, and every two to three years filled out questionnaires about how often they ate a 50 gram bar of chocolate. They could also indicate if they ate half or a bar or more than one.

The participants were not asked about what kind of chocolate they ate, but researchers asked a subset of 1,568 participants to describe the chocolate they ate in the last 24 hours to give an indication of what proportions might be found in the entire study. The results within this subset showed 57% ate milk chocolate, 24% dark chocolate, and 2% white chocolate.

By the end of the study, researchers found that people who ate the most chocolate, an average of 7.5 grams per day, had a 27% lower risk of heart attack and a 48% lower risk of stroke than people who ate the least amount of chocolate, an average of 1.7 grams per day.

"To put it in terms of absolute risk, if people in the group eating the least amount of chocolate (of whom 219 per 10,000 had a heart attack or stroke) increased their chocolate intake by six grams a day, 85 fewer heart attacks and strokes per 10,000 people could be expected to occur over a period of about 10 years," Buijsse says.

People who ate the most chocolate also had blood pressure that was about 1 point systolic (the top number in a blood pressure reading) and 0.9 point diastolic (the bottom number) lower than people who ate the least amount of chocolate.
Flavanols in Chocolate Help Heart

Researchers say the benefits of chocolate on reducing heart disease risk appear to be because of the high flavanol content of cocoa. Flavanols are a type of antioxidant, and chocolates with a higher percentage of cocoa, such as dark chocolate, contain more flavanols.

"Flavanols appear to be the substances in cocoa that are responsible for improving the bioavailability of nitric oxide from the cells that line the inner wall of blood vessels," Buijsse says. "Nitric oxide is a gas that, once released, causes the smooth muscle cells of the blood vessels to relax and widen; this may contribute to lower blood pressure. Nitric oxide also improves platelet function, making the blood less sticky."

Experts say together with previous research the results of this study build a strong case that eating a daily dose of chocolate is healthy for the heart.

"Basic science has demonstrated quite convincingly that dark chocolate particularly, with a cocoa content of at least 70%, reduces oxidative stress and improves vascular and platelet function," Frank Ruschitzka, professor of cardiology and director of heart failure/transplantation at the University Hospital Zurich in Switzerland, says in the release.

SOURCES: Buijsse, B. European Heart Journal, March 31, 2010, online advance edition. News release, European Heart Journal.