Tuesday, January 4, 2011

Discrepancies Often Found Between Young Adults' Self-Reported Sexual Histories and Their STDs

A significant proportion of adolescents and young adults who test positive for sexually transmitted diseases report not having had any sexual activity in the past year, according to a Pediatrics study.

Some 14,000 young adults (mean age, 22) were interviewed in their homes about their sexual activity and provided urine specimens to test for chlamydia, gonorrhea, and trichomoniasis. Roughly 12% of those who tested positive for an STD said they had not had sex the past 12 months, and 6% of the STD-positive participants reported never having had sex. No sociodemographic factors were associated with discrepancies between self-reported history and STD results.

The authors say that relying solely on self-reported penile/vaginal sexual activity to assess STD risk could be imprecise and problematic. They conclude: "If pediatricians and adolescent medicine physicians do not test all young people, there are likely a substantial number of missed cases ... that will go undiagnosed, untreated, and spread to future sex partners."

Thursday, December 16, 2010

A New Rapid Test for Detection of HIV

December 13, 2010 | Rochelle P. Walensky, MD, MPH

Published in Journal Watch HIV/AIDS Clinical Care December 13, 2010

Citation(s):

FDA approves bioLytical Laboratories' INSTITM rapid HIV test [press release]. Vancouver, British Columbia, and Chicago, Illinois: bioLytical Laboratories; Dec 1 , 2010. (http://www.biolytical.com/media.html)


The INSTI HIV-1 antibody test delivers results in as little as 60 seconds.

FDA approved INSTI, a new rapid point-of-care HIV-1 antibody test that can provide results from blood and plasma specimens in as little as 60 seconds, with a minimum sensitivity of 99.8% and a minimum specificity of 99.5%. Previously approved rapid HIV tests take 10 to 20 minutes to generate results.

Positive results on any rapid HIV test require confirmation, which usually takes 1 to 2 weeks using standard Western blot or enzyme-linked immunosorbent assay. However, because this new test was generated using different antigens than those used to develop other rapid tests, it opens the door to the possibility of a "rapid/rapid" algorithm, in which one rapid test is used to detect infection and another to confirm it.

Comment:

INSTI offers the unique attribute of faster test processing with nearly immediate delivery of results. Having results within a minute or two alleviates many of the logistical concerns related to patient flow that have challenged clinic-based point-of-care HIV screening programs.

Other tests will probably still have a role, however; the OraQuick rapid HIV test is currently under FDA review for over-the-counter use.

Monday, December 6, 2010

Novel Drugs with Novel Reaction Patterns

Marta R, Philippe-Jean B, Pascal D. Curr Opin Allergy Clin Immunol. 2010;10(5):457-462.

New Risk Factor:

1. Sex

Current studies continue to argue in favor of the female sex as a risk factor for
developing ADRs.

Zopf Y, Rabe C, Neubert A, et al. Gender-based differences in drug
prescription: relation to adverse drug reactions. Pharmacology 2009; 84:333–339.

Macy E, Poon K-YT. Self-reported antibiotic allergy incidence and prevalence: age
and sex effects. Am J Med 2009; 122:778.e1–778.e7.


2. Atopy

May be a risk factor for developing sensitization to beta-lactam antibiotics in
tertiary hospital nurses.

Choi IS, Han ER, Lim SW, et al. Beta lactam antibiotic sensitization and its
relationship to allergic diseases in tertiary hospital nurses. Allergy Asthma
Immunol Res 2010; 2:114–122.



Recent findings Traditional and complementary alternate medicines are also causes of adverse drug reactions, and many of them are cataloged as allergy.

Jacobsson I, Jönsson AK, Gerdén B, et al. Spontaneously reported adverse
reactions in association with complementary and alternative medicine substances in Sweden. Pharmacoepidemiol Drug Saf 2009; 18:1039–1047.


The study showed that 1.2% of the total reports concerned suspected ADRs were related to 175 different CAM products.

The main reactions were urticaria (8.3%), exanthema (7.4%) and contact dermatitis (5.7%).

The most reported were purple coneflower (Echinacea purpurea) (8.1%), Siberian ginseng (Eleutherococcus senticosus), malabar nut (Adhatoda vasica) (7.3%) and ginkgo leaf (Ginkgo biloba) (6.7%).

Zeng ZP, Jiang JG. Analysis of the adverse reactions induced by natural
product- derived drugs. Br J Pharmacol 2010; 159:1374–1391


Three thousand one hundred twenty-two cases involving 140 different drugs were analyzed. Herba houttuyniae and Shuanghuanglian were the most common drugs involved.


Research in the field of skin and drug provocation test to antibiotics such as beta-lactams and carbapenems has allowed the understanding of cross-reactivity reactions and permitted the use of well tolerated alternate drugs in cases of proper negative drug allergy work-up.

Cross-reactions between Imipenem/Cilastatin and Penicillins

Atanasković-Marković M, Gaeta F, Gavrović-Jankulović M, et al. Tolerability of imipenem in children with IgE-mediated hypersensitivity to penicillins. J Allergy Clin Immunol 2009; 124:167–169.

Work on cross-reactivity between penicillins and carbapenems in children with proven IgE-mediated allergy to penicillins.

The rate of cross-reactivity to imipenem/cilastatin detected by skin tests and drug provocation was 0.8%.

Schiavino D, Nuecera E, Lombardo C, et al. Cross-reactivity and tolerability
of imipenem in patients with delayed-type, cell-mediated hypersensitivity to beta-
lactams. Allergy 2009; 64:1644–1648.


Work on cross-reactivity in proven cell-mediated allergy to beta-lactams.

They found a 5.5% rate of cross-reactivity.

These studies open the opportunity to administer imipenem/cilastatin to those patients with proven allergy to penicillins after performing skin tests(immediate and delayed readings) and drug provocation tests.


Many unique cases have been reported, including diverse drugs as infliximab, succinylcholine, hydroxychloroquine, that widen the spectrum of clinical manifestations of drug hypersensitivity to various drugs.


Summary

As new and old drugs continue to be used, new reports regarding new and known drug hypersensitivity manifestations are made. Advances in mechanisms are enhanced by the use of new in-vitro techniques to detect specific antibodies or T cells. Research in the field of skin and provocation tests has allowed the use of well tolerated alternate drugs in individuals with proven drug allergy.

Sunday, November 21, 2010

Psychocutaneous Disorder

The Current Management of Delusional Parasitosis and Dermatitis Artefacta

Caroline S. Koblenzer, MD

Skin Therapy Letter. 2010


Introduction:

Patients who present with delusional parasitosis or dermatitis artefacta are not easy for dermatologists to work with, whose treatment requires the use of drugs unusual to the dermatologist and a significant investment of the clinician's time.

Each is a skin manifestation of a psychiatric disorder that represents a psychological defense - a way for the patient to avoid the acknowledgment of psychiatric pathology.

Delusions of Parasitosis

The delusions seen in dermatology are "systematized" or non-bizarre - i.e., they are fixed beliefs that, though false, control the patient's feelings and behavior in ways that are wholly consistent with the content of those beliefs. Delusions of parasitosis associated with cutaneous dysesthesia.

The delusional patient is often defensive, angry, and distrusting. The patient desperately wants answers. "We do not know the cause, but we have treatments that are effective" or "We have seen other patients with similar symptoms, and whatever is the cause, there are changes in the skin that we can treat" are possible answers.

Intensive topical measures are helpful (e.g., tar or bleach baths, emollients, and antibiotics as indicated). Topical agents, such as pramoxine hydrogen chloride cream or lotion, may be used to provide temporary relief of any dysesthesia.

Antipsychotic drugs are the first-line treatment (Much smaller doses than those used). Pimozide has long been the drug of choice. Risperidone and aripiprazole are preferable to olanzapine.

50–90% of patients are reported to have near or full symptom resolution, with improved functioning and any psychiatric and physical comorbidities tend to improve in parallel.

Dermatitis Artefacta

Dermatitis artefacta refers to skin lesions produced by the patient, under the veil of secrecy, to satisfy an unconscious need to be taken care of.

Lesions that are morphologically bizarre, often geometric in outline, destructive, and reportedly of sudden, mysterious yet fully formed appearance. Patients with neurotic excoriations usually have depression or anxiety with obsessive-compulsive features; those with Munchausen's syndrome have a sociopathic personality, while patients with dermatitis artefacta are most commonly diagnosed with the borderline personality disorder.

Dermatologic support is important, borderline patients are best treated psychiatrically, though a recommendation for psychiatric referral must be approached very judiciously. The antipsychotics are the drugs of choice and aripiprazole has an advantage in that it also has antidepressant properties.

Discussion:

Because patients with delusional parasitosis and dermatitis artefacta do not accept the need for psychiatric treatment, they fall either to the lot of the dermatologist or receive no help at all.

An optimal approach includes frequent short clinic visits, expression of empathy, affirmation that the skin itself is involved, and low dose antipsychotic drugs. With compliance, remissions of varying length occur, but both disorders are likely to last life-long.

Tuesday, November 9, 2010

Rebound of plasma viremia following cessation of antiretroviral therapy despite profoundly low levels of HIV reservoir

Chun T-W et al. Rebound of plasma viremia following cessation of antiretroviral therapy despite profoundly low levels of HIV reservoir: Implications for eradication. AIDS 2010 Oct 19.

The persistence of HIV in CD4 cells despite full virologic suppression in plasma renders the prospect of viral eradication highly unlikely, at least with present strategies. However, initiation of antiretroviral therapy (ART) very early during acute HIV infection limits the size of the viral reservoir, and some studies suggest that it may deplete the pool of HIV-infected CD4 cells over time. In this study, researchers further explore whether early, long-term administration of potent ART might eliminate viral reservoirs.

Using quantitative real-time polymerase chain reaction, the researchers measured genomic HIV DNA in highly purified CD4 cells obtained from 44 patients who had achieved long-term suppression on ART without any episodes of detectable viremia.

Nine of the patients had started ART <6 months after acquiring HIV. These patients were found to have significantly lower levels of HIV proviral DNA (mean, 4.6 copies per million CD4 cells) than the patients who started ART later, and four of them had no proviral DNA detected.

One such patient was found to have an extremely low level of virus after 10.5 years of ART (1 infected cell per 1.7 billion CD4 cells). Under close follow-up, this patient discontinued ART. For 7 weeks, he had no virus detected in his plasma, but then his plasma HIV RNA level rebounded to 1593 copies/mL.

It spontaneously returned to an undetectable level for a brief period, only to rebound again during week 20, reaching 8684 copies/mL. At that time, ART was restarted.

Comment:

In this study and others, initiating long-term effective ART very early rather than later was associated with lower levels of residual HIV. Nonetheless, this seemingly favorable combination of very early ART, long-term consistent virologic suppression, and a very limited viral burden in the reservoir of CD4 cells did not prevent HIV recurrence after withdrawal of ART.

Although reemergence of the virus took longer in the patient described here than in patients in other studies who had less favorable circumstances, viral rebound still occurred in <2 months. Long-term virologic suppression without ART will require novel strategies to target the rare infected cells that rekindle the infection systemically.

Friday, October 29, 2010

22nd World Congress of Dermatology (WCD)

WCD 2011

Period: May 24 - 29, 2011
Location: Seoul, Korea
Venue: COEX Convention and Exhibition Center

Hosted by International League of Dermatological Societies
Organized by Korean Dermatological Association

Previous World Congresses

(The name of the international congress was changed in 1992 to the World Congress of Dermatology)

No Host City President Secretary-General

1 Paris, 1889 A. Hardy H.Feulard

2 Vienna, 1892 M. Kaposi G.Riehl, Sr.

3 London, 1896 J. Hutchinson J.J. Pringle

4 Paris, 1900 E. Besnier G.Thiebierge

5 Berlin, 1904 E. Lesser O.Rosenthal

6 New York,1907 J.C. White J.Fordyce

7 Rome, 1911 T.deAmicis G.Ciarrocchi

8 Copenhagen,1930 C. Rasch S.Lomholt

9 Budapest, 1935 L. Nekam S.Rothman

10 London, 1952 A. Gray G.B.Mitchell-Heggs

11 Stockholm, 1957 S. Hellerstrom G.H.Floden

12 Washington, 1962 D.M. Pillsbury C.S.Livingood

13 Munich, 1967 W. Jadassohn C.G.Schirren

14 Padua-Venice,1972 F. Flarer F.Serri

15 Mexico City,1977 A. Gonzalez-Ochoa L. Dominquez-Soto

16 Tokyo, 1982 A. Kukita M. Seiji

17 Berlin, 1987 G. Stuttgen C.E. Orfanos

18 New York, 1992 J.S.Strauss S.I. Katz

19 Sydney, 1997 R.Marks A.J. Cooper

20 Paris, 2002 J. Revuz J.-P. Ortonne

21 Buenos Aires,2007 R. Galimberti A.M. Pierini

Monday, October 18, 2010

BLINCK approach

BLINCK approach is simple and useful algorithm to help clinicians determine if a pigmented lesion warrants biopsy. The use of this algorithm will improve the pickup rate of potentially serious skin cancers as well as reduce the number of unnecessary benign lesion excisions.

BLINCK may be especially helpful to clinicians who have only basic or intermediate dermoscopy skills but who are regularly called upon to assess skin lesions in their practices.

BLINCK checklist is introduced by Dr. Peter Bourne, a founder of the Skin Cancer College of Australia and New Zealand (SCCANZ). The score for the lesion was added up to 4 by criteria as following.

1. B. The lesion was not clearly benign at our first initial evaluation
2. L. The lesion appeared to be lonely without any other similar melanocytic lesion near by
3. I. The lesion appeared to be irregular outline and color on our dermoscopic exam
4. N & C. The patient was nervous about the change in color in past 4-6 months
5. K. The lesion exhibited known clues when viewed with a dermatoscope. See "Chaos and Clues" reference below.

BLINCK Score = 4

According to the BLINCK approach, a lesion should be biopsied if the BLINCK score is 2 or more out of a possible 4. Therefore, the we excised this lesion and sent for a pathologic evaluation.