Thursday, August 2, 2007

Thursday August 2, 2007

Case: 24 year old male admitted with left thigh cellulitis and abcess. I and D was performed and cefazolin (ancef) was initiated. Patient did not respond to cefazolin and antibiotic was changed to vancomycin after availability of sensitivity from micro lab. Patient showed marked improvement over next 3 days except patient complaint of new rash on his body which you attributed to "Red man syndrome" and wrote an order to infuse vancomycin slowly and with increase dilution. Next day, as you reached hospital, you were informed by outgoing intensivist that patient deteriorated overnight and required intubation. You were baffled and as you examine the patient, you find extensive dermal exfoliation along with axillary and inguinal lymphadenopathy. On lab, LDH and liver enzymes were markedly elevated and kidney funtion deteriorated from normal to anuria. CBC showed eosinophilia.



Vancomycin-induced Stevens-Johnson syndrome


Stevens-Johnson syndrome is an acute mucocutaneous process characterized by severe exfoliative dermatitis and mucosal involvement of the gastrointestinal tract and conjunctiva. Pathogenesis is unclear, but an immunological mechanism, probably cell-mediated, has been suggested. Clinical diagnosis of Stevens-Johnson syndrome is based on the presence of "target" or "iris" lesions involving the skin and erosive lesions of two or more mucosal surfaces. Associated findings include extensive dermal exfoliation, nephritis, lymphadenopathy, hepatitis, and multiple serologic abnormalities. Vancomycin, a glycopeptide antibiotic, has case reports in literature produceing immunologically mediated adverse reactions such as interstitial nephritis, linear IgA bullous dermatosis, exfoliative erythroderma, necrotizing cutaneous vasculitis and toxic epidermal necrolysis. The treatment consists of cessation of vancomycin and administration of antihistamine and/or steroid.




References: click to get abstract/article

1.Vancomycin-induced Stevens-Johnson syndrome Allergy Asthma Proc. 1996 Mar-Apr;17(2):75-8.

2.Stevens-Johnson-type reaction with vancomycin treatment. - Ann Pharmacother. 1992 Dec;26(12):1520-1

3 Uncommon Vancomycin-Induced Side Effects - Brazilian Journal of Infectious Diseases - 2002;6(4):196-200

Wednesday, August 1, 2007

Wednesday August 1, 2007


Q; 72 year old female with no significant past medical history has been admitted from ER to ICU with progressive mental status change over last 3 days. Only significant finding in workup is Na+ of 123 mEq/liter. The only pertinent history is start of a new anti-depressant medication about 2 weeks ago. Per son, there is no sign of drug over-dose ?


A; Anti-depressants' associated hyponatremia.One of the significant but less know side effect of anti-depressants, mostly SSRIs is hyponatremia. Exact mechansism is unknown but it causes SIADH (Syndrome of Inappropriate Antidiuretic Hormone). It has also been reported with 'atypical' anti-depressents' (venlafaxine, trazodone, maprotiline, nefazodone, bupropion) as well as with tricyclic antidepressants (TCAs) and monamine oxidase inhibitors (MAOIs).When prescribing antidepressants particularly to elderly patients, consideration of hyponatremia should be kept in mind. Patients who develop mental status change need prompt assessment of electrolytes' status. Patients already at risk of the SIADH (such as cancer) should be prescribed anti-depressent with caution and close followup.


Related previous pearl: ANTIDEPRESSANTS' AND SEROTONIN SYNDROME


References: click to get abstract/artice

1. Hyponatremia in the psychiatric population: a review of diagnostic and management strategies. Psychiatr Ann 2003; 33:318–325

2. Hyponatremia secondary to antidepressants. Psychiatr Ann 2003; 33:333–339

3.
Hyponatremia in elderly psychiatric patients treated with selective serotonin reuptake inhibitors and venlafaxine: a retrospective controlled study in an inpatient unit. Int J Geriatr Psychiatry 2002; 17:231–237

4. Hyponatremia with venlafaxine. Ann Pharmacother 1998; 32:49–50

5.
Severe symptomatic hyponatremia during citalopram therapy - a case report - BMC Nephrology 2004, 5:2