Candidiasis: Overgrowth and Infection of Yeast Event Type Live Online Expiration Date 7/16/2016 Credits 1 Contact Hour Target Audience Nurses, Pharmacists, Pharmacy Technicians Program Overview Candidiasis is a fungal infection that can affect areas such as the skin, genitals, throat, mouth and blood. It’s caused by the overgrowth of a type of yeast / fungus, usually a species called Candida albicans. This yeast is normally found in small amounts in the human body, but can become pathogenic in certain situations. Systemic infections of the bloodstream and major organs, particularly in immunocompromised patients, affect over 90,000 people a year in the U.S. Candida overgrowth can cause many health problems, including fatigue, headache, poor memory and weight gain. Many natural remedies exist to combat Candidiasis, as well as numerous antifungal pharmaceutical agents. Nurse Educational Objectives Describe the pathophysiology, frequency and implications of candidiasis Outline the natural/non-pharmacological methods used to treat candidiasis Compare and contrast the most common pharmaceuticals used to treat Candidiasis, including mechanisms of action and potential side effects Pharmacist Educational Objectives Describe the pathophysiology, frequency and implications of candidiasis Outline the natural/non-pharmacological methods used to treat candidiasis Compare and contrast the most common pharmaceuticals used to treat Candidiasis, including mechanisms of action and potential side effects Pharmacy Technician Educational Objectives List signs and symptoms of candidiasis List natural medicines used to treat candidiasis List pharmaceuticals used to treat candidiasis Activity Type Knowledge Accreditation Nurse Pharmacist Pharmacy Technician N-886 0798-0000-14-016-L01-P 0798-0000-14-016-L01-T PharmCon, Inc. is accredited by the Accreditation Council for Pharmacy Education as a provider of continuing pharmacy education. PharmCon, Inc. has been approved as a provider of continuing education for nurses by the Maryland Nurses Association which is accredited as an approver of continuing education in nursing by the American Nurses Credentialing Center’s Commission on Accreditation. Faculty J Dufton, MD Medical Writer & Speaker, Wellness Partners Financial Support Received From Pharmaceutical Education Consultants, Inc. Disclaimer PharmCon, Inc. does not view the existence of relationships as an implication of bias or that the value of the material is decreased. The content of the activity was planned to be balanced and objective. Occasionally, authors may express opinions that represent their own viewpoint. Participants have an implied responsibility to use the newly acquired information to enhance patient outcomes and their own professional development. The information presented in this activity is not meant to serve as a guideline for patient or pharmacy management. Conclusions drawn by participants should be derived from objective analysis of scientific data presented from this activity and other unrelated sources. Page 1 Candidiasis: Overgrowth and Infection of Yeast © 2014 Pharmaceutical Education Consultants, Inc. unless otherwise noted. All rights reserved. Reproduction in whole or in part without permission is prohibited. Candidiasis: Overgrowth and Infection of Yeast DISCLAIMER: This activity contains images of an "adult" nature. Please be sure that you do not have children within view of the computer during this activity. DISCLAIMER: This activity contains images of an "adult" nature. Please be sure that you do not have children within view of the computer during this activity. Accreditation Faculty Pharmacists: 0798-0000-14-016-L01-P Pharmacy Technicians: 0798-0000-14-016-L01-T Nurses: N-886 J Dufton, MD Medical Writer and Speaker Wellness Partners CE Credit(s) Faculty Disclosure 1 contact hour(s) Dr. Dufton has no actual or potential conflicts of interest in relation to this program. Learning Objectives • • • Describe the pathophysiology, frequency and implications of Candidiasis. Outline the natural / non-pharmacological methods used to treat Candidiasis. Compare and contrast the most common pharmaceuticals used to treat Candidiasis, including mechanisms of action and potential side effects. Legal Disclaimer The material presented here does not necessarily reflect the views of Pharmaceutical Education Consultants (PharmCon) or the companies that support educational programming. A qualified healthcare professional should always be consulted before using any therapeutic product discussed. Participants should verify all information and data before treating patients or employing any therapies described in this educational activity. Objectives • Describe the pathophysiology, frequency and implications of Candidiasis. • Outline the natural / non-pharmacological methods used to treat Candidiasis. • Compare and contrast the most common pharmaceuticals used to treat Candidiasis, including mechanisms of action and potential side effects. Overview • • • • • Candida is a category of dozens of yeast / fungi species about 20 Candida species cause infections in people most common infectious agent = Candida albicans infections are referred to as candidiasis common locations of candidiasis include the intestines, mouth, genitals and w/in moist folds of skin • candidiasis commonly occurs in people w/ weakened immunity or those on drug therapy: • antibiotics and corticosteroids • focal candidiasis can spread throughout body via the blood & lymph and become life threatening systemic infections Page 2 Candidiasis: Overgrowth and Infection of Yeast © 2014 Pharmaceutical Education Consultants, Inc. unless otherwise noted. All rights reserved. Reproduction in whole or in part without permission is prohibited. Focus on C. albicans Types of Candida • most common cause of opportunistic fungal infections • part of normal human flora & fauna, but can become pathogenic and colonize skin / mucous membranes Candida Pathogen % of cases Candida albicans (“monilia”) almost 50% of all invasive candidiasis, particularly of the vagina Candida parapsilosis ~30%, high natural resistance to antimicrobial drugs Candida glabrata rising, >15%, common cause of oral thrush Candida tropicalis ~10% of cases and is a main cause of septicemia & disseminated candidiasis Candida krusei 1% of cases, associated w/ infant diarrhea Candida lusitaniae <1% of cases, similar to C. tropicalis Incidence / Prevalence • a diploid fungus that grows both as a yeast and filamentous structure (shown on right) • lives in 80% of the human population w/out causing harmful effects / symptoms Unicellular yeast changes in temp, pH, flora Multi-cellular fungal form (or hypha) • C. albicans can exist as 2 completely different forms (dimorphism) • hyphae are more virulent and can deeply penetrate tissue • C. albicans is a true opportunistic pathogen Incidence / Prevalence cont’d • In the U.S., Candida species are the most common fungal infections among the immune compromised • Mortality rates of systemic candidiasis (candidemia) have not improved much over the years and remain between 30-40%. • Oropharyngeal colonization found in up to 55% of healthy young adults, and detected in up to 65% of healthy feces. • Systemic candidiasis causes more case fatalities than any other systemic mycosis. • 75% of women experience at least 1 bout of vulvovaginal candidiasis (VVC) during their lifetimes. • Neither sex is more predisposed to candidiasis, but VVC is the 2nd most common cause of vaginitis. • More than 90% of HIV patients eventually develop oropharyngeal candidiasis (oral thrush). • Sexually promiscuous people have significantly higher incidence. • Neonates and adults >65 years are most susceptible to candidiasis. • In people w/ systemic infections, Candida species are now the 4th most commonly isolated pathogens from blood. • Similar rates of candidiasis / candidemia have been observed industrialized countries, but higher rates in developing countries Page 3 Candidiasis: Overgrowth and Infection of Yeast © 2014 Pharmaceutical Education Consultants, Inc. unless otherwise noted. All rights reserved. Reproduction in whole or in part without permission is prohibited. Causes of Candidiasis • Weakened Immune System: greatest risk of developing candidiasis • compromised by diseases such as AIDS, diabetes, cancer, thyroid / pituitary disorders, STDs • treatment protocols such as chemotherapy & radiation • poor nutrition, high levels of stress, chronic lack of sleep • candidiasis spreads systemically in about 15% of cases • Antibiotics: broad-spectrum, especially for more than a few weeks • kills off too much of the “good” flora & fauna • upsets balance needed for proper digestion, healthy immunity and normal alkalinity levels • Candida quickly takes advantage of imbalances by rapid overgrowth • meat & dairy products, as well as municipal drinking water, can be contaminated w/ antibiotics • Other Pharmaceuticals: steroids, migraine meds, birth-control pills, immunosuppressive drugs and synthetic hormone supplements Symptoms: Oral Thrush • Candidiasis develops anywhere in / outside the body • Oropharyngeal candidiasis (oral thrush): infects the inside lining of the cheeks, top and sides of tongue, throat • light colored, cheese-like, raised lesions that can be painful making chewing and swallowing difficult • bleeding gums & sore throat common • leads to cracking at sides of mouth • produces sweet, musty smelling breath • commonly occurs among kids taking antibiotics, neonates (5-7%), people w/ cancer (20%), AIDS patients (90%) Causes Cont’d • Diet: high starch diets, too much coffee, meat, alcohol, refined & artificial sugars dramatically increase acidity (lower pH) w/in tissues, which provides good environment for Candida to proliferate • important nutrient deficiencies include zinc, selenium, vitamin D • gluten sensitivity & lactose intolerance can complicate candidiasis • Poor Hygiene: not washing well can cause Candida to proliferate in skin folds / vagina • complicated by obesity, reduced mobility • Environmental factors: very significant and often overlooked • glues, petroleum-based solvents, silicones, dry-cleaning chemicals, formaldehyde, pesticides, bisphenols (plastics) and heavy metals (lead & mercury) Symptoms: Skin Rash • Cutaneous candidiasis (fungal skin infection): is common in warm, moist regions of the body, such as the underarms, buttock cleft, underneath breasts and folds of skin. • Obese and large breasted elderly women at higher risk, especially if they can’t reach these areas to clean thoroughly. • Candida skin infections are gray or reddish in color and itchy. • often includes inflammation, blisters and characteristic musty odor • some diaper rashes caused by yeast • yellow, fluid-filled spots that can break open and become flaky Page 4 Candidiasis: Overgrowth and Infection of Yeast © 2014 Pharmaceutical Education Consultants, Inc. unless otherwise noted. 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Symptoms: Nail Infection • • • • Onychomycosis: fungal infection of toenails / fingernails causes nail-beds to thicken, split and crumble nail-beds turn a white, yellow or gray color the fungal form of Candida burrows deeply into nail-beds very difficult to eliminate • frequently associated w/ immersion of the hands / feet in in water and w/ diabetes • often infects adjacent nails • can result in nail loss • also produces musty odor Symptoms: Vaginal Yeast Infection • Vulvovaginal candidiasis (VVC): often called yeast infection • typically leads to genital itching, burning, and sometimes a clumpy “cottage cheese-like” discharge • soreness and inflammation common • causes painful intercourse / urination • not considered an STD per se, but male partners of women with yeast infections can develop short-term rash / burning sensation on penis • dependent on condom use • hyphae cause the irritation • healthy immunity fends off infection Symptoms: Fungal Balanitis Pathophysiology • Men w/ poor immunity (cancer, AIDS, diabetes) can develop candidiasis in / around their penises balanitis. • Candida species are normally commensals of diseased skin and mucosal membranes of the GI, GU and respiratory tract • characterized by inflammation, redness, itchiness, burning pain • intercourse / urination painful • Candida species contain their own set of virulence factors: • more common in uncircumcised men • foreskin promotes accumulation of cheese-like yeast substance • foreskins can swell and crack • candidiasis can spread to scrotum, thighs and buttocks • not considered an STD • surface molecules that permit adherence to other structures • acid proteases & phospholipases that penetrate cell envelopes • ability to convert to a hypha form (phenotypic switching) • Host “defects” that allow for Candida infection include: • • • • • poor / compromised immunity (lack of white blood cells) disrupted flora & fauna (broad-spectrum antibiotics) wounds, intravenous catheters, burns, ulcerations organ / bone marrow transplants and other surgeries severe trauma (physical / emotional), including premature birth Page 5 Candidiasis: Overgrowth and Infection of Yeast © 2014 Pharmaceutical Education Consultants, Inc. unless otherwise noted. All rights reserved. Reproduction in whole or in part without permission is prohibited. Pathophysiology cont’d • First step in the development of candidiasis is colonization of mucocutaneous surfaces. Routes of invasion include: • disruption of skin or mucosa, allowing access to bloodstream • deep penetration via the GI wall, then bloodstream • Leaky Gut Syndrome allows easy entry of Candida into bloodstream. • Once Candida starts to proliferate in the blood (candidemia), systemic colonization is imminent. • Vital organs most often affected include brain, heart and kidneys. Implications of Systemic Candidiasis • about 15% of focal candidiasis becomes systemic within patients with severely reduced immune function • of these, between 30-40% of cases result in death from the widespread infection of vital organs • encephalitis (brain), endocarditis (heart), and nephritis (kidneys) are most common causes of death Treatment Overview Anti-Candida Diet • Depends on severity and location, but a wide range of therapies & doses are used to treat candidiasis. • Candida species need poor immunity, reduced microbial competition and a source of easily processed energy (ie. refined sugar or alcohol) in order to thrive. • Drug Therapies: triazoles, imidazoles, polyenes, echinocandins, low-strength corticosteroids • Dietary Modifications: reducing sugar intake, low dairy, less processed foods, more alkalizing foods, no alcohol, no peanuts • Herbal Remedies: many plant products have anti-fungal properties such as garlic, oregano, tea tree oil, olive leaf extract, grapefruit seeds, cloves, Echinacea, pomegranate • Other Supplements: vitamin C, EFAs, probiotics, bee propolis • Lifestyle Changes: wearing breathable undergarments (100% cotton), better hygiene, more responsible use of antibiotics • Many herbs / plants deter Candida and other types of microbes, particularly green leafy examples such as kale, Swiss chard, bok choy, collards, arugula, watercress and turnip greens. • Other good veggies include hot peppers, broccoli, celery, onions, zucchini and Brussels sprouts. • Citrus fruits, pomegranate and coconuts also combat Candida. • Fresh, raw produce almost always packs more of a medicinal punch. Page 6 Candidiasis: Overgrowth and Infection of Yeast © 2014 Pharmaceutical Education Consultants, Inc. unless otherwise noted. All rights reserved. Reproduction in whole or in part without permission is prohibited. Herbal Remedies • Raw Garlic: contains allicin -- compound proven to kill fungi. Take 1 clove daily (or 1 tablet w/ 4,000 5,000 mcg of allicin). Increases risk of bleeding and interacts w/ many meds. • Coconut Oil: contains 3 different fungicidal FAs (caprylic, capric & lauric acids) that are effective against Candida. The FAs kill yeast by destroying cell walls, so resistance is very unlikely. Start w/ 1-2 tablespoons each morning and increase up to 5. • Oil of Oregano: contains carvacrol and thymol both fungicides that completely inhibit Candida albicans via dehydration. Also highly effective for prevention. Start w/ 3 drops / day diluted in water and increase up to 6. Can cause burning sensation. Dietary Supplements • Vitamin C: RDA far too low • • • • strong antioxidant able to destroy free radicals & stimulate immunity displays anti-fungal properties and needed for tissue repair (collagen) helps to alkalize the blood and other body fluids dose = 1- 3 grams of vitamin C daily; too much may trigger diarrhea • Omega-3 fats: includes ALA, EPA and DHA • • • • strong anti-inflammatory properties and aids in tissue repair too much omega-6 (primrose oil) cancels benefits EPA & DHA found in fish oils; ALA in flaxseed, hemp & walnuts may increase risk of bleeding and shouldn’t be combined w/ bloodthinners (clopidogrel, warfarin, aspirin) • dose = 1 gram 2-4 X daily Herbs cont’d • Grapefruit Seed Extract: not only a strong antifungal, but also contains vitamins C & E and bioflavonoids such as hesperidin all immune boosters.10 drops diluted in water / 3x per day: can be added to vaginal douche. • Olive Leaf Extract: contains oleuropein, a strong fungistatic. Also stabilizes blood sugar. Take 2 capsules (20% oleuropein) 3x daily w/ meals. Combines well w/ vitamin C for synergistic effects. • Goldenseal, cloves, cinnamon, sage, tea tree oil, fresh pomegranate juice and Echinacea extracts also have antifungal properties, but are not as commonly used to fight Candida species. Supplements cont’d • Probiotics: Lactobacillus acidophilus or bifidobacterium • helps restore normal balance of bacteria in GI & mucous membranes • taking probiotics (“friendly bacteria”) w/ antibiotics may help prevent buildup of Candida, although evidence is mixed • sources include yogurt & kefir: must say “contains live / active cultures” • at least 10 billion colony-forming units/day via supplementation • Boric Acid / Borax: essential mineral mined from dried salt lakes • an excellent fungicide used to treat Candida • prevents yeast form from becoming hyphae stage • dose = 1/8 - 1/4 teaspoon of borax powder / liter of water daily (1 wk) • Hydrogen peroxide: controversial Candida remedy • good general antimicrobial externally, including some fungal infections • may promote Candida growth internally due to bactericide actions Page 7 Candidiasis: Overgrowth and Infection of Yeast © 2014 Pharmaceutical Education Consultants, Inc. unless otherwise noted. All rights reserved. Reproduction in whole or in part without permission is prohibited. Supplements cont’d • Bee propolis: resinous mixture of tree sap, buds, leaves that bees make to seal hives -- antifungal properties noted in test tube studies. Study showed that propolis eliminated oral thrush in people w/ denture stomatitis (mouth sores). Not appropriate for people allergic to honey. • Colloidal / ionic silver: one of the most powerful and effective natural anti-fungal agents known. Silver atoms show potent effects against Candida -comparable to amphotericin B and superior to Diflucan. No microbe can develop resistance against silver atoms. Main issues are particle size, purity and cost. Learning to make it best idea. Great for oral rinses and vaginal douches. Topical Therapy • Localized cutaneous candidiasis is treated with topical OTC and Rx antifungal agents such as clotrimazole, econazole, ciclopirox, miconazole, ketoconazole and nystatin. • available as creams / gels / shampoos / ointments • application for up to 4 weeks usually sufficient • If the topical infection is deep, drainage of the abscess (if necessary) and oral (systemic) antifungals are indicated. • For Candida onychomycosis, oral itraconazole (Sporanox) appears to be most effective. Two treatment regimens: • daily dose of itraconazole (100-150mg) for 3-6 months • pulsed-dose regimen that requires higher dose (200mg) for 7 days, followed by a 3 week break -- repeated for 3-6 months Systemic Drug Therapy • Fluconazole (Diflucan): agent of choice for candidemia, vaginal candidiasis & oral thrush because it’s effective, relatively non-toxic and the only antifungal that passes B-B barrier to treat CNS infections. • triazoles = fungistatic (inhibit enzyme 14α-demethylase) • some Candida species have developed resistance to fluconazole, which is why it’s often used in combo w/ other agents • for Candida, doses widely range from 150mg weekly to 600mg daily • available as solution / cream / tablets • Voriconazole (Vfend): newer triazole and used on Candida species resistant to fluconazole; appropriate for invasive infections. • little more toxic to the liver compared to fluconazole, but fewer side effects compared to amphotericin B • “salvage therapy” for infections that don’t respond to other meds • for systemic infection, common dose = 200mg 2x daily Systemic Therapy cont’d • Itraconazole (Sporanox): another triazole given orally or by IV • widely used to treat fungal nail infections • broader spectrum of activity than fluconazole • Posaconazole (Noxafil): a triazole given orally as a liquid • • 2 studies suggest it may be superior to fluconazole or itraconazole in the prevention of invasive fungal infections, but it may cause more serious side effects loading dose = 300mg 2x on the first day maintenance dose: 300mg daily for up to 2 weeks • Imidazoles: ketoconazole (Nizoral), clotrimazole (Mycelex), miconazole (Monistat): in OTC shampoos / creams / lozenges • difference between the triazoles and imidazoles involves the mechanism of inhibition of the cytochrome P450 enzyme -- triazoles have a higher specificity, making them more potent, but less toxic Page 8 Candidiasis: Overgrowth and Infection of Yeast © 2014 Pharmaceutical Education Consultants, Inc. unless otherwise noted. All rights reserved. Reproduction in whole or in part without permission is prohibited. Systemic Therapy cont’d • Flucytosine (Ancobon): demonstrates excellent ability in killing Candida species, although many are quick to become resistant to it. • as such, it’s often combined w/ fluconazole and/or amphotericin-B • recommended daily oral dose is 50-150mg / kg of bodyweight, divided into 4 equal doses every 6 hours • another downside is it’s very high cost -- $$$ • Amphotericin-B (many brand names): is a polyene (fungicidal) and kills most Candida species directly, but it’s considered the most toxic antimicrobial in clinical use -- especially to the liver • • • • not absorbed in GI, so must be IV administered for systemic infections often administered to patients along w/ fluconazole initial IV infusion of 1-5mg/day, slowly increased to ~0.5mg/kg/day also available as lipid formulations, which have been developed to improve patient tolerability -- may show different characteristics Topical Corticosteroids • Topical corticosteroids (Topicort): reduce inflammation, but also suppress the immune response. • anti-inflammatory properties are helpful for Candida infections of the skin, particularly in reducing itchiness and redness • however, reduced immune response may actually promote the spread of systemic Candida • better suited for other skin conditions such as psoriasis • long-term use can cause thinning of the skin and numerous other side effects, including weight gain, hair growth and mood problems Systemic Therapy cont’d • Nystatin (Mycostatin, Nilstat): also a polyene and sold primarily as oral rinses and lozenges meant to combat oral thrush • also available as a cream for vaginal candidiasis • daily doses vary: 100,000 units (oral thrush) - 1 million units (systemic) • not absorbed in the GI, so no problems w/ drug interactions • Echinocandins: class of antifungals that include caspofungin (Cancidas), micafungin (Mycamine) and anidulafungin (Eraxis) newer recommendations (2009) for use for Candida species. • • • • glucan synthesis inhibitors: kill yeast & fungus w/out destroying cell wall newer fungicides w/ minimal toxicity administered via IV caspofungin more effective, less toxic than amphotericin-B & triazoles clinical data suggests that anidulafungin more effective in treating severely ill systemic candidiasis patients than fluconazole • increased rate of survival Focus on VVC • Acute vulvovaginal candidiasis (VVC) can be managed with either topical antifungal agents or a single dose of oral fluconazole 150mg. • Antifungal vaginal suppositories or creams are commonly used and effective duration can range from 1 day to 7 days of therapy and are usually between 80-90% successful for an isolated acute VVC episode. • A small percentage of women (<5%) experience chronic recurrent VVC infections, which often require long-term oral triazole therapy. • In such patients, the recommendation is fluconazole 150mg every other day for 1 week, followed by weekly 150-200mg doses for 6 months this prevents recurrence in more than 80% of women. • Natural douches w/ ionic silver, coconut oil, grapefruit seed extract or tea tree oil may be effective too, but not well studied. Page 9 Candidiasis: Overgrowth and Infection of Yeast © 2014 Pharmaceutical Education Consultants, Inc. unless otherwise noted. All rights reserved. Reproduction in whole or in part without permission is prohibited. Candida Die-Off • When yeast cells are rapidly killed, a die-off (Herxheimer reaction) occurs and their metabolic by-products are released into the body • Candida yeast cells release 79 different toxins when they die, including ethanol and acetaldehyde • These toxins can impair brain function and affect the endocrine, immune & respiratory systems often leads to “brain fog” & fatigue • Other die-off symptoms include: nausea, headaches, dizziness, GI pain, joint & muscle pain, chills, fever and sweating Surgical Care • Major organ infections associated with candidal abscesses may require surgical drainage procedures along w/ antifungal meds. • Prosthetic joint infection with Candida species requires the removal of the prosthesis. • Surgical debridement is usually necessary for joint infections, especially vertebral osteomyelitis. • Both pharmaceutical / natural antifungals can cause die-off symptoms • Splenic abscesses occasionally require splenectomy. • The goal is to take antifungals at doses and frequencies that limit dieoff symptoms, which vary from person to person • Heart valve replacement surgery is always indicated to treat endocarditis caused by Candida. • Healthy liver function is crucial in eliminating toxins from the body and minimizing die-off symptoms Notes: Notes:
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