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Showing posts with label Nervous System. Show all posts
Showing posts with label Nervous System. Show all posts

Wednesday, February 24, 2016

Shingles (Herpes zoster)

By: The Patient

Shingles is a nerve pain that usually becomes painful blistering rash on the skin. Shingles is caused by zoster virus, the same virus that causes chickenpox.

Shingles is reactivation of the chickenpox virus. When you have chickenpox as a young child the virus stays inactive, it becomes a dormant in certain nerves in the body. Shingles occur after the virus becomes active again years later. The virus is activated when stress, aging, certain diseases and medicine weakens the immune system. Shingles can develop in any age group but usually develops in people who are 60 years and older and had chickenpox before they were one year old. Statistic has shown that one in three people will have shingles. Symptoms can happen in stages before any rash appear, usually it starts with one-sided pain, tingling or burning sensation, itching, flu like symptoms and headache. When rash appears it looks like red patches on the skin or small blisters that can stay on the skin for 2 to 3 weeks. The rash is usually around the spine, belly area and chest area but it can also be around face, eyes, mouth, ears and neck. Sometimes the blisters can leave permanent scars and nerve pain can be long-term. Shingles is treated with antiviral and pain medications. If detected in early stage shingles can be treated with antiviral medication to help with rash and pain relief. Shingles cannot be passed on unless a person is in direct contact with liquid from the blisters and didn’t have chickenpox as young child or chickenpox vaccine.

Shingle vaccine is recommended for people 60 and older, younger than that will need a prescription from the doctor.

Work Cited:

PubMedHealth. (2015, November 19). Shingles. Retrieved February 09, 2016, from http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001861/

WebMD. (2014, September 11). Shingles. Retrieved February 10, 2016, from http://www.webmd.com/skin-problems-and-treatments/shingles/shingles-topic-overview

Cdc. (2015, August 05). Prevent Shingles. Retrieved February 10, 2016, from http://www.cdc.gov/features/shingles/

Monday, February 15, 2016

Dupuytren’s Disease

By: Zombieland

Although many factors may contribute to the predisposition of Dupuytren’s Disease, there has been conflicting evidence of correlation and causation found in relation to alcoholism or hard-labor work. Many studies over history have failed to establish a definitive link between alcoholism, hard-labor work and Dupuytren’s Disease, but rather the only proven correlating link is solely heredity.

Dupuytren’s Disease, also known as “Viking’s Disease”, is a condition causing debilitating contractures (flexing, rigidity, or clawing) of the fingers and can progress to limited or full loss of hand function. The disease occurs most often in men of Northern European decent that are over the age of 60 (women can also develop the disease, but are less likely than men). Dupuytren’s is estimated to affect about 10% of the population of men aged over 65 currently living in Northern Europe 4. Dupuytren’s Disease has a well-established history, whose transmission is believed to stem from the 10th century invasions by Scandinavian Vikings. Once colonization of Scotland, Ireland, England, France, Holland and Belgium was established by the Vikings, the disease began to be passed on through intercultural relationships1.

Dupuytren’s Disease was first described by Swiss physician Felix Plater in 1614 2, but its namesake is derived from Baron Guillaume Dupuytren who, later in 1831, recorded multiple lectures regarding the disease and its origin and also performed the first surgery on a hand contracture of this type. Dupuytren, known as the greatest French surgeon of the 19th century, described seeing an increase of male patients of Irish descent presenting with permanent flexed fingers. Through research of his own, he concluded that the disorder was caused by an increase or thickening in the palmar fascia (a tough, fibrous layer of tissue in the palm of the hand5). Dupuytren also concluded that there were strong indicating factors such as Irish descent, alcoholism, and manual labor contributing to the cause of the disease, as most of his presenting patients were immigrant Irish manual laborers who drank excessively. This foundation of knowledge also brought to light “The Curse of the Mac Crimmons”, which was a belief that the Mac Crimmon family, who ran The College of Bagpiping in Scotland from the 15th century to the 18th century, had a curse laid upon the men in the family that inflicted bent fingers in the adult male bagpipers and prevented them from playing later in life1.

These bent fingers were described by Dupuytren in his lectures as a bend of the finger (contracture). Contractures can develop in a variety of number of digits, but most occur in the ring and small fingers. The degree of contracture can vary greatly depending on each individual’s disease process. Along with these contractures, nodules (small lumps) were described to be present on the palms of the hands. These nodules are usually firm and round and may cause the skin of the palm to pucker or pit. Although these hallmark characteristics observed in someone with Dupuytren’s Disease is often debilitating, it is usually not painful. The rate of development of contractures and nodules is different with each individual. Some patients may have nodules but never develop contractures and some patients may have both that progressively and rapidly worsen. Variabilities exist between the least severe case and the worst severe case. Patients often seek medical advice when the bent finger(s) impedes normal, everyday functions. Patients often describe that the contracted finger will snag on the pocket of their pants or that the finger will poke them in the face as they are attempting to wash. Many seek what treatments are available from an Orthopedic Hand Surgeon, who has specialized training in the diagnosis and treatment of Dupuytren’s Disease. Treatments include injections to dissolve collagen and multiple degrees of surgery, but there is no cure. Dupuytren’s Disease does recur and the rate of recurrence is dependent upon the individuals’ disease process 3.

Guillaume Dupuytren may have monumentally described the basic origin and characteristics of the disease, but many discoveries have been made regarding the actual process of development. It is widely agreed upon that the formation of contractures results from a tight cord that forms from an increase in collagen growth, promoted by cells called myofibroblasts (a cell that shares characteristics of both smooth muscle cells and fibroblast cells). This tight cord can be likened to a rope and is comprised mostly of collagen type III; normal palmar fascia is predominantly made up of collagen type II. The nodules that form, likened to a knot, are dense, highly cellular (many cells) masses of tissue. Cords and nodules can be exclusive from each other but nodules may also present on or within the cord, like knots in a rope 3.

The evolution of the discovery of Dupuytren’s Disease and its cause has been controversial for hundreds of years. Many researchers believe that the previously stated predicting factor of alcohol use was simply an oversight on behalf of Guillaume Dupuytren, who assumed that alcohol was a causative agent in the development of the disease, and failed to recognize a factor of culture in Irish and Scottish descent where heavy alcohol use was widely accepted and practiced. Other researchers, more recently in the last century, believe they have found a link that does relate to alcohol use being a contributing factor, by means of exciting myofibroblast cells and in turn increasing collagen growth in the hand 3. Controversy also surrounds the original idea that manual labor contributes to Dupuytren’s contractures. Some researchers have documented that the correlation that Guillaume Dupuytren made based on his Irish immigrant patients was, again, an oversight of coincidence; most Irish immigrants in France during the 19th century were manual laborers. On the other hand, some recent research indicates that trauma to the hand may trigger a repair process to begin where cytokines (small proteins that aid in cell signaling) are released and tell the myofibroblast cells to increase their number to repair the injury. This subject is loosely discussed in relationship with the original idea that manual labor contributes to the disease process, but more-over believed to be a possibility that repetitive, hard labor of the hand causes small injuries to occur, which in-turn trigger this process of repair 3.

There may be controversy and argument surrounding the causation of Dupuytren’s Disease but three things are widely agreed upon: (1) the cause of the disease is multifactorial in nature 4, (2) onset and prevention of progression has yet to be discovered 4 and (3) congenital predisposition is the only confirmed correlation of transmission, causation and recurrence although no specific gene has yet to be isolated 3.

Citations:

1 Flatt, A. E., MD. (2001). The Vikings and Baron Dupuytren’s disease. Baylor University Medical Center Proceedings, 14(4), 378-384. Retrieved February 10, 2016, from www.ncbi.nlm.nih.gov/pmc/articles/PMC1305903

2 Desai, S. S., MD. (2011). The Treatment of Dupuytren Disease. Journal of Hand Surgery, 36(A), 936-942. Retrieved February 10, 2016 from www.jhandsurg.org

3 Black, E. M., MD, & Blazar, P. E., MD. (2011). Dupuytren Disease: An Evolving Understanding of an Age-old Disease. Journal of the American Academy of Orthopaedic Surgeons, 19,746-757. Retrieved February 10, 2016 from www.aaos.org/jaaos

4 Frey, M., MD. (1997). Risks and prevention of Dupuytren’s Contracture. The Lancet, 350, 1568. Retrieved February 10, 2016

5 Krames. (2014). Dupuytren’s Contracture- Restoring Movement in Your Hand. www.kramesstaywell.com





ZIKA: Balancing Fear with Facts

By: OCR-Mama

You have heard about Zika virus. You have seen the heart-wrenching images of babies born with microcephaly or an abnormally small head. The World Health Organization is talking about it. The Centers for Disease Control and Prevention is talking about it. Your grandma is calling you to talk about it. Zika is spreading rapidly and can have dire health effects. Even as I write this new stories are popping up by the minute, but what are the facts about Zika? What is the real risk for you as a pregnant mom in the US? Before you finish your gestation in a DEET-filled cave, let’s look at what is known and unknown about Zika.

What is Zika virus and how do you get it?


Zika virus disease or ZIKV or Zika fever is caused by a mosquito-borne virus that was first identified in 1947 in a caged rhesus monkey in Africa. In humans the first cases were identified in 1952. In 2013 and 2014 French Polynesia had a ZIKV outbreak with an uptick in central nervous system malformations including microcephaly.

In 2015 a Zika virus outbreak swept through Brazil. 2016 has seen no end to the outbreak and Zika continues to spread through the Americas. So although this disease is not new, the areas of the world that have been impacted by the Zika virus are expanding and the effects on these naive populations are getting attention.

Mosquitos carry the virus and infect the human by acting as a vector for transmission. Mosquitos are excellent vectors because they break through the top layer of skin or epidermis and get into the dermis below. They do this because blood is their meal, but this also allows the virus to make it’s way into the host’s blood. The skin, like a suit of armor, protects against most dangers but a poisonous needle piercing through a chink can cause grave harm.

The cells of the dermis called dendritic cells and fibroblasts have receptors that allow Zika to enter the cell and replicate. The virus has other factors contributing to the rapid spread in areas with many mosquitos. A mosquito can pick up Zika from an infected person and then pass it along to another person. Meaning, a mosquito can become a carrier by biting someone who is sick.

Transmission is no longer thought to be limited to the work of mosquitos either. There is growing evidence that Zika virus disease can be transmitted sexually and remains in semen longer than it has cleared from the blood in an infected person. So if your partner has travelled to a region with Zika it is wise to use condoms or abstain until he has been cleared from the disease whether or not symptoms occur. This route of transmission, however, is much less likely than from a mosquito. So while unlikely to be an issue, better safe than sorry.

Not all mosquitoes carry the Zika virus. In fact, transmission is mainly by Aedes mosquitoes which are most commonly found in tropical environments. For US women concerns about contracting Zika are mainly around travel to area that have cases of Zika and sexual contact with partners that have experienced Zika virus disease. The CDC and WHO are actively tracking the disease and issuing travel guidelines for pregnant women or women who may become pregnant. Currently no locally-acquired cases of this disease have presented in the US, but travel-related cases have. Tracking of the disease and its spread are ongoing and if you have travel plans check with these sources for the latest recommendations.

What are the symptoms of Zika virus disease?

If Zika virus disease occurs symptoms are likely to begin around a couple days after exposure and symptoms are generally mild, lasting 2-7 days. These symptoms include fever, skin rash, discomfort, headache, joint and muscle pain, and eye redness. Most people infected with Zika virus will have no lasting harm from the disease. If a woman is pregnant when the Zika virus is contracted, however, the virus may cause severe brain damage to the unborn and is linked to a condition called microcephaly. The relationship between Zika virus and microcephaly is not fully understood by scientists.

How is Zika virus disease treated?

Symptoms of Zika virus can be eased with rest, drinking plenty of water, and taking pain relievers like ibuprofen. No antiviral medications are recommended at this time for Zika and no vaccination is available. If you are pregnant and suspect you have Zika virus talk to your doctor about what tests are available. Blood, urine, and saliva tests may be used to find viral RNA and the CDC has released an algorithm for testing. Ultrasound may be used to look for calcifications in the fetal skull and microcephaly. Recommended testing is still controversial and not widely available. The reality is that if you haven’t travelled to a region currently affected by Zika or live in that region then you aren’t considered to be at risk for Zika.

What is microcephaly and does Zika cause it?


Microcephaly is a condition that literally means small head. The head grows in a developing fetus because the brain is growing. In microcephaly the brain is not growing normally and this can be linked to a range of serious difficulties. Many causes of microcephaly are known such as infections like rubella, toxoplasmosis, and cytomegalovirus. Malnutrition or toxic exposures in development like alcohol can also cause microcephaly. ZIKV genetic material has been found in the brain tissue samples of a fetus with microcephaly whose mother was exposed to ZIKV during her pregnancy and experienced symptoms of ZIKA fever in her 13th week of pregnancy. ZIKV genetic material has also been found through amniocentesis. It is not proven that Zika causes microcephaly, but researchers think that the virus may target and replicate in the developing brain of a fetus. Zika doesn’t seem to cause lasting harm in other organs or tissues but stays and replicates in the brain stem.

The best prevention for ZIKV is to not get bit by a mosquito. Consider guidelines and consult with your doctor about travel plans. Look at the EPA’s recommendation for mosquito repellants and follow the directions carefully if you are expecting exposure. If you do they are safe to use during pregnancy. Wearing long pants and shirts can help as well. Standing water is prime breeding ground for mosquitos and can become a safety risk so care should be taken to prevent this. So the ZIKV media frenzy may be inducing worries in your pregnant mind, but fear is a beast that thrives on attention. Arm yourself with facts and be well.

References:

Akpan, Nsikan (January 29, 2016  updated February 1, 2016) How does Zika virus shrink a baby’s brain and other FAQs.  PBS NewsHour. Retreived from: http://www.pbs.org/newshour/updates/zika-virus-faqs-ultrasound-detection/

Centers for Disease Control and Prevention. (February 12, 2016).
Facts about Microcephaly (article). Retreived from: http://www.cdc.gov/ncbddd/birthdefects/microcephaly.html

Centers for Disease Control and Prevention. (January 29, 2016).
Possible Association Between Zika Virus Infection and Microcephaly — Brazil, 2015
(Morbidity and Mortality Weekly Report).   Retreived from: http://www.cdc.gov/mmwr/volumes/65/wr/mm6503e2.htm

Mlakar, J M.D., Korva, M Ph.D., Tul, N M.D., Ph.D., Popović, M M.D., Ph.D., Poljšak-Prijatelj,  M Ph.D., Mraz, J  M.Sc.,... Avšič Županc, T Ph.D. (February 10, 2016) Zika Virus Associated with Microcephaly.  The New England Journal of Medicine.  DOI: 10.1056/NEJMoa1600651

McNeiL, D.G. Jr., Saint Louis, C. & St. Fleur, N.  ( February 16, 2016).  Short Answers to Hard Questions about Zika Virus. The New York Times. Retreived at: http://www.nytimes.com/interactive/2016/health/what-is-zika-virus.html?_r=0

World Health Organization.  (February 2016).  Zika Virus (fact sheet). Retreived from: http://www.who.int/mediacentre/factsheets/zika/en/






Raynaud's Disease

By: TheGreenLabCoat

Working in Family Medicine, you see several chronic diseases on a daily basis: diabetes mellitus 2, hypertension, and osteoporosis - Or as one of our elderly patients jokingly refers to them, “all these old people diseases.” Recently during a new patient visit, I noticed that this patient’s fingers were a different color from the rest of her hand; fleshy, pink hands but with almost paper white fingers. At first I thought it might have been a skin discoloration that naturally occurs in some people, but through the course of the visit her hand gradually turned blue, and then a bright shade of red. I couldn’t help but to ask the patient, “Are you aware that your fingers have been changing colors since you sat down in here?” The patient waved her unusually colorful hand in the air, stating “Oh honey, I have Raynaud’s, it's fine. I was just holding my soda.” Not knowing exactly what she meant at the time, I decided to educate myself on the subject: What is Raynaud’s?


Raynaud’s Disease, named after Maurice Raynaud in 1862, is a disorder of the blood vessels that causes them to overreact, predominantly in the hands and feet. Our body has an internal thermostat with many locations of thermometers. When we are cold, the sensors in our body tell us “Hey, we need to keep the heat up so that all of our organs continue to function.” It sends out a signal that binds to receptors on our blood vessels, instructing them to secrete vasoconstriction hormones. When this happens, our blood vessels constrict, kind of like shutting all the windows around the house to keep the heat in. In this situation there is less blood going to our extremities, keeping the core of our bodies warmer. People who have Raynaud’s disease are unable to regulate the appropriate blood flow when exposed to cold temperatures. Their blood vessels spasm, which can cause pain, numbness, and tingling. Color changes in fingers are the most observable symptoms when an attack is happening. Emotional distress may also be a trigger of this phenomenon.

Though the exact cause of Raynaud’s is still unknown, scientists have been able to separate this disease into two major classifications: Primary Raynaud’s Phenomenon (PRP) and Secondary Raynaud’s (SR). PRP is the most common type in most people. Development can occur at any age but happens most frequently between the ages of 15 - 30, and it typically affects women more often than men. If a family member has PRP, there is a 33% chance that their offspring will develop the disease as well.

Secondary Raynaud’s (SR) has been associated with rheumatic disorders such as Lupus and scleroderma. Depending on severity of SR, it could be life threatening due to the hardening of blood vessels which down the road could be a contributing factor of heart issues such as ischemia or plaque buildup in the arteries.

Neural abnormalities, hormonal and genetic factors, and smoking all have been noted as potential causes of this disease. A few blood tests and observing capillaries of the fingernails under a microscope are the common methods of diagnosing Raynaud’s Disease. There currently are no medications to cure Raynaud’s. Outcomes for patients with PRP are usually very good. No reported mortality and little morbidity. In very rare cases, ischemia of the affected body part can result in necrosis.

Following the guidelines below can help prevent an attack:
●        Keep warm - Manually regulating body temperature can help to prevent an attack. For instance, avoid moving from a hot summer day to a cold air conditioned room. Wearing mittens and socks to bed during winter, or changing out of wet clothing items a rainy day are both good preventative measures.
●        Do not smoke - Nicotine in cigarettes causes the body temperature to lower, which may trigger an attack.
●        Control stress - Emotional well being can prevent an attack. Relaxation methods such as meditation has been reported useful.
●        Avoid stimulating medications, foods - Vasoconstrictor medications such as narcotics, beta blockers (blood pressure medication) OTC cold medication, and caffeine.

As for SR, there is no FDA-approved medication specifically, but this type of Raynaud’s is usually treated with calcium channel blockers such as amlodipine (norvasc) and felodipine which work by relaxing the smooth muscle and dilating the small blood vessels.
When my patient returns to the clinic, hopefully just for a routine check up, I will be able to have a conversation with her about this disease and not look like a deer caught in headlights. I might be able to learn a few pointers from her to potentially offer future patients with this disease some information.

References

Peer-Reviewed
Herrick, A. L. (2005, May 01). Pathogenesis of Raynaud’s phenomenon. Retrieved February 12, 2016, from http://rheumatology.oxfordjournals.org/content/44/5/587.full.pdf html
Wigley, F. M., MD. (2002, September 26). Raynaud's Phenomenon. Retrieved February 12, 2016, from http://www.nejm.org/doi/full/10.1056/nejmcp013013

Non-Peer-Reviewed
Hansen-Dispenza, H., MD, & Lisse, J. R., MD,FACP. (2015, November 17). Raynaud Phenomenon. Retrieved February 12, 2016, from http://emedicine.medscape.com/article/331197-overview
Mayo Clinic Staff. (2015, March 04). Diseases and Conditions Raynaud's disease. Retrieved February 12, 2016, from http://www.mayoclinic.org/diseases-conditions/raynauds-disease/basics/definition/con-20022916


Raynaud’s Phenomenon by Dr. Nicolas Gumpert is licensed under CC BY 2.0