OBSERVATION. Diltiazem Induces Severe Photodistributed Hyperpigmentation. Case Series, Histoimmunopathology, Management, and Review of the Literature
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1 OBSERVATION Diltiazem Induces Severe Photodistributed Hyperpigmentation Case Series, Histoimmunopathology, Management, and Review of the Literature Rao N. Saladi, MD; Steven R. Cohen, MD; Robert G. Phelps, MD; Andrea N. Persaud, MD; Donald Rudikoff, MD Background: Diltiazem hydrochloride is a commonly prescribed benzothiazepine calcium channel blocker for the treatment of cardiovascular disease. Recently, 8 cases of diltiazem-induced photodistributed hyperpigmentation occurring predominantly in elderly African American women were reported. Here, we report occurrence for the first time in a light-skinned African American woman and a Hispanic woman. We also report this finding in an African American man. Biopsy specimens of hyperpigmented areas were obtained for histopathologic evaluation and marker studies. Photospectrometry analysis for diltiazem was performed to analyze the photoabsorption properties of this drug. Observations: Routine laboratory examination results were normal in all patients. Serologic test results for antinuclear antibodies, including Sjögren antibodies anti-ro (SS-A) and anti-la (SS-B), were negative. Histopathologic analysis of the skin biopsy specimens revealed a sparse lichenoid infiltrate, prominent pigmentary incontinence, and numerous melanophages in the dermis. There was no increase in dermal mucin suggestive of lupus. The mononuclear cells in the specimens were strongly positive for CD3, weakly positive for CD68, and either weakly positive or negative for CD79a. All specimens were negative for Alcian blue staining. Photospectrometry analysis of diltiazem showed an absorption range within the UV-B spectrum. Conclusions: Photospectrometry analysis revealed diltiazem could demonstrate a photosensitizing effect within the UV-B range. Discontinuation of therapy with diltiazem is the most effective modality in resolving hyperpigmentation. Avoidance of sun exposure and consistent use of sunscreens and sun-protective clothing are indicated for patients undergoing diltiazem therapy. Arch Dermatol. 2006;142: Author Affiliations: Departments of Dermatology (Drs Saladi, Cohen, Phelps, Persaud, and Rudikoff) and Dermatopathology (Drs Saladi and Phelps), Mount Sinai School of Medicine, New York, NY. THE US FOOD AND DRUG Administration approved 3 new calcium channel blockers (nifedipine, verapamil hydrochloride, and diltiazem hydrochloride) in the 1970s and 1980s for treating cardiovascular diseases. Diltiazem, a benzothiazepine, is a widely prescribed agent used in treating hypertension and angina. Adverse effects of the drug include rare cutaneous eruptions such as maculopapular rashes, urticaria, and pruritus. 1-3 Even rarer severe adverse effects include subacute cutaneous lupus erythematosus, Stevens-Johnson syndrome, 4 toxic epidermal necrolysis, 1 and vasculitis. 5 Photosensitivity reactions of the skin associated with diltiazem rarely have been reported. 1,2,6-8 Diltiazem-induced photodistributed hyperpigmentation has been reported, until now, in 8 cases occurring mostly in African American women We report occurrence for the first time in a lightskinned African American woman and a Hispanic woman. We also report this finding in an African American man. REPORT OF CASES All 4 patients were seen at dermatology clinics affiliated with the Mount Sinai School of Medicine in New York, with a chief complaint of increased pigmentation on the face. The demographic characteristics of the individual patients are described in Table 1. Duration of pigmentation ranged from 6 to 24 months. There were no associated local or systemic symptoms. The patients medical histories were remarkable for hypertension treated with diltiazem but no use of other medications that could be implicated as a cause for hyperpigmentation. Physical examination in all patients revealed diffuse slate-gray to gray-blue pigmented macules and patches on the face, neck, and forearms (Figure 1). Perifollicular accentuation was noted 206
2 Table 1. Demographic Characteristics of Cases of Photodistributed Hyperpigmentation After Diltiazem Therapy* Source Case No./Sex/ Age, y/race Fitzpatrick Skin Phototype Onset After Initiation of Diltiazem Hydrochloride Therapy, mo Distribution Saladi et al 1/F/67/B VI 15 Face, neck, forearms Saladi et al 2/M/67/B VI 10 Face, neck Saladi et al 3/F/50/H III 6 Face, neck, forearms Saladi et al 4/F/82/W 77/I 1½ Face Scherschun et al, /F/49/B V 6 Face, neck, chest, forearms, hands Scherschun et al, /F/72/B IV 11 Face, neck, chest Scherschun et al, /F/56/B V 8 Face, neck Scherschun et al, /F/71/B V 7 Face, neck, forearms Chawla and Goyal, /F/57/B V 24 Face, neck, back, shins Boyer et al, /M/71/B VI 12 Face, neck 11/M/49/H IV 24 Face, neck Kuykendall-Ivy et al, /F/66/B V 6 Face, neck, hands Abbreviations: B, black; H, Hispanic; W, white. *Cases 1 through 4 are the authors cases, and cases 5 through 12 are previously reported cases. A B C D E F Figure 1. Distinctive appearance of photodistributed hyperpigmentation in patients undergoing diltiazem hydrochloride therapy (A-I). Hyperpigmentation is consistent with the sun-exposed areas of the face, neck, and forearms. The pigmentation ranges from slate-gray to gray-blue and dark brown. Perifollicular accentuation was noted in some patients. G H I clinically in several patients (Figure 1). A sharply demarcated hyperpigmented patch demonstrating a V shape was noted in 3 of 4 patients on the upper chest or neck (Figure 1). No periorbital edema or erythema and no periungual erythema or telangiectasia were present. After query, patients revealed a mild to moderate history of exposure to sunlight during diltiazem therapy. Results of routine laboratory testing in all patients, including a complete blood cell count, liver function tests, serum urea nitrogen and creatinine levels, complete metabolic profile, and thyroid function tests, were all normal. Serologic test results for antinuclear antibodies, including Sjögren antibodies anti-ro (SS-A) and anti-la (SS-B), were negative. Skin biopsy specimens of the hyperpigmented areas were obtained, and histopathologic evaluation and marker studies were conducted. Histopathologic findings were similar in all patients. Specimens showed a thinned epi- 207
3 A B C D Figure 2. Histoimmunopathology of diltiazem hydrochloride induced hyperpigmented sites. A and B, There is sparse perifollicular and focally lichenoid infiltrate in the dermis, with numerous melanophages. The infiltrate has a striking perifollicular distribution often associated with follicular plugging (original magnification 10). C, Some specimens were associated with apoptotic keratinocytes (arrows) and hydropic changes of the follicular epidermis (original magnification 20). D, The infiltrate is strongly CD3 positive and demonstrated lichenoid perivascular and perifollicular patterns (original magnification 10). Scale bar is 50 µm. ABS Wavelength, µm Figure 3. Photospectrometer graph of diltiazem hydrochloride showing the absorption range ( nm) within the UV-B spectrum ( nm). ABS indicates absorbance. dermis with effaced rete ridges and focal interface vacuolar changes with small groups of hyaline globules in the uppermost papillary dermis. There were sparse lichenoid changes with interstitial and superficial perivascular infiltrates of inflammatory cells, predominantly composed of lymphocytes. Prominent pigmentary incontinence and numerous melanophages were seen in the dermis (Figure 2A and B). Some biopsy specimens showed perifollicular accentuation, colloid bodies, and association with apoptotic keratinocytes and hydropic changes of the follicular epidermis (Figure 2C). However, none of the biopsy specimens showed increased dermal mucin that might suggest lupus; they were negative for Alcian blue staining. The infiltrating mononuclear cells were strongly CD3 positive (Figure 2D), weakly CD68 positive, and weakly positive or negative for CD79a cells. The CD3-positive cells also showed striking perifollicular extension (Figure 2D). COMMENT Photosensitivity reactions associated with the use of diltiazem were reported previously. These cutaneous adverse effects include erythema, pruritus, and/or lichenoid eruptions, which mostly develop soon after exposure to the sun. 2,7,8 However, photodistributed hyperpigmentation associated with the use of diltiazem recently has been reported (Table 1). Analysis of all these reported cases in the literature showed that onset of pigmentary changes developed within 6 to 24 months after use of diltiazem. Patient age ranged between 49 and 77 years. Distribution of hyperpigmentation was consistent with sunexposed areas of the face, neck, and forearms, with lesser pigmentation on the lower chest, back, and shins. Pigmentation was mild to severe with a slate-gray, grayblue, or dark brown appearance. To determine the photoabsorption spectrum of diltiazem, photospectrometry analysis of the drug was performed. The results showed diltiazem s absorption range to be 220 to 300 nm, within the UV-B spectrum (Figure 3). These results correlate with previous data showing no absorption in the UV-A spectrum. 9 Although the UV-A range is thought to be the major contributory factor for photosensitivity reactions, several drugs (eg, tetracyclines, thiazides) 13 exert photosensitivity properties in the UV-B range (5%-10% UV-B coexists in sunlight). 14,15 Furthermore, the pattern of photodistributed pigmentation and history of mild to moderate sun exposure during diltiazem therapy in the patients in our study also supports diltiazem s photosensitizing effect. In efforts to elicit the causal mechanism, Scherschun et al 9 demonstrated that persistent darkening of hyperpigmented patches occurred in patients exposed only to UV-A. However, electron microscopic evaluation did not reveal drug or metabolite deposits in the skin biopsy specimens; therefore, the authors thought diltiazem may exert its photosensitizing properties through other mechanisms. Several diltiazem metabo- 208
4 lites have been identified; however, the specific metabolites involved in the adverse effects of the skin are not yet known. 16 Generally, for a drug to be regarded as a photosensitizer, the absorption wavelength of the drug should be within the range of UV-B ( nm), UV-A ( nm), and/or visible light ( 400 nm). 13,15 Drugs that induce photodistributed hyperpigmentation are activated metabolically (via solar radiation) forming free radicals and reactive intermediates that covalently bind to cellular proteins and DNA. This binding is considered critical in eliciting drug immunotoxicity by producing various enzymatic reactions that trigger a cascade of events, including a release of erythrogenic and pigmentary mediators that result in phototoxic and hyperpigmentary drug reactions. 13 Drugs that induce photosensitivity hyperpigmentation include antimicrobial agents (tetracyclines), diuretic agents, psychotropic drugs, antimalarial agents, nonsteroidal anti-inflammatory drugs, cardiovascular drugs, cytotoxic drugs, and other agents. 13,17,18 Diltiazem-induced photodistributed hyperpigmentation may be similar to other drug-induced photodistributed hyperpigmentation. Amiodarone, chlorpromazine hydrochloride, imipramine hydrochloride, and desipramine hydrochloride also induce slate-gray macules or patches However, diltiazem-induced photodistributed hyperpigmentation can be distinguished from minocycline hydrochloride induced hyperpigmentation and argyria. 9 Minocycline hyperpigmentation appeacrs in areas of cutaneous inflammation, typically in acne scars. 22 Argyria induces slategray pigmentation not only in sun-exposed areas but also in the lunulae of nails, mucous membranes, and sclerae. 23 Patients undergoing treatment with calcium channel blockers such as diltiazem have developed drug-induced subacute cutaneous lupus erythematosus. These patients had positive serologic test results and characteristic subacute cutaneous lupus erythematosus histoimmunopathologic findings. 24,25 Prevention of diltiazem-induced photodistributed hyperpigmentation can be achieved by initiating photoprotective measures, including use of broad-spectrum sunscreens containing UV-A and UV-B blockers with a sun protection factor of 15 or greater and behavioral modification by limiting sun exposure and wearing sunprotective clothing. Sunscreen use should be initiated at the beginning of diltiazem therapy. If hyperpigmentation develops during diltiazem therapy, discontinuation of diltiazem is the most effective remedy. Better resolution of hyperpigmentation gradually has been observed in patients discontinuing diltiazem 9-12 than in those using topical bleaching agents or chemical peels while continuing therapy. 12 Application of topical bleaching agents (hydroquinone cream) may be useful in reducing the hyperpigmentation across time. In the patients in our study, use of 4% hydroquinone cream caused partial resolution across time. The patient showed complete clearance of hyperpigmentation after 1 year of diltiazem discontinuation and use of hydroquinone cream. Furthermore, substitution with another calcium channel blocker such as nifedipine 3,4,26-28 or verapamil 1 in patients with adverse cutaneous reactions to diltiazem causes no further complications. Table 2. Analytical Observations and Management of Diltiazem-Induced Photodistributed Hyperpigmentation Characteristic Specific Data Total No. of cases reported 12 Ethnicity, ratio African American/all other ethnic groups ( 4:1) F/M, ratio 3:1 Mean age, y 63 (range, 49-77) Hyperpigmentation Site of distribution Predominantly on sun-exposed (photodistributed) areas: face, neck, and forearms Mean time of 12 mo after diltiazem hydrochloride appearance therapy Color/appearance Slate-gray, gray-blue, dark brown, reticulated, macules, patches Prevention Sun exposure Limit during diltiazem hydrochloride therapy Photoprotective measures Treatment Use broad-spectrum UV-A/UV-B sunscreen and adequate covering of sun-exposed areas from the start of diltiazem hydrochloride therapy Discontinue treatment with diltiazem hydrochloride and/or use topical bleaching agents or chemical peels Some conclusions can be drawn on the basis of the cases reported (Table 1 and Table 2). Diltiazeminduced photodistributed hyperpigmentation has been found in other ethnic groups and skin types, but darkskinned individuals and women were more prone to hyperpigmentation. The association of drug-induced hyperpigmentation in darker skin has never been understood. Results of previous reports and our case series indicate that only patients with severe hyperpigmentation seek dermatological care. Family practitioners, internists, cardiologists, and dermatologists who care for patients using diltiazem should be aware of diltiazeminduced hyperpigmentation and its association with sun exposure. We recommend that these patients limit their sun exposure, wear sun-protective clothing, and use broad-spectrum sunscreen from the start of diltiazem therapy. Accepted for Publication: July 15, Correspondence: Donald Rudikoff, MD, Department of Dermatology, Mount Sinai Medical Center, 1425 Madison Ave, Campus Box 1047, New York, NY (RNAhybrid@aol.com). Financial Disclosure: None. Acknowledgment: We thank Jane B. Hilfer, MD, and Sapna R. Palep, BS, for their assistance in this project. REFERENCES 1. Stern R, Khalsa JH. Cutaneous adverse reactions associated with calcium channel blockers. Arch Intern Med. 1989;149: Seggev JS, Lagstein Z. Photosensitivity skin reactions to calcium channel blockers. J Allergy Clin Immunol. 1996;97: Wirebaugh SR, Geraets DR. Reports of erythematous macular skin eruptions associated with diltiazem therapy. DICP. 1990;24:
5 4. Taylor JW, Cleary JD, Atkinson RC. Stevens-Johnson syndrome associated with diltiazem. Clin Pharm. 1990;9: Sheehan-Dare RA, Goodfield MJ. Severe cutaneous vasculitis induced by diltiazem [letter]. Br J Dermatol. 1988;119: Knowles S, Gupta AK, Shear NH. The spectrum of cutaneous reactions associated with diltiazem: three cases and a review of the literature. J Am Acad Dermatol. 1998;38(2, pt 1): Hashimoto M, Tanaka S, Horio T. Photosensitivity due to diltiazem hydrochloride. Acta Dermatol. 1979;74: Young L, Shehade SA, Chalmers RJ. Cutaneous reactions to diltiazem [letter]. Clin Exp Dermatol. 1990;15: Scherschun L, Lee MW, Lim HW. Diltiazem-associated photodistributed hyperpigmentation: a review of 4 cases. Arch Dermatol. 2001;137: Chawla A, Goyal S. Diltiazem-induced hyperpigmentation in an African American woman [letter]. J Am Acad Dermatol. 2002;46: Boyer M, Katta R, Markus R. Diltiazem-induced photodistributed hyperpigmentation. Dermatol Online J. 2003;9: Kuykendall-Ivy T, Collier SL, Johnson SM. Diltiazem-induced hyperpigmentation. Cutis. 2004;73: Moore DE. Drug-induced cutaneous photosensitivity: incidence, mechanism, prevention and management. Drug Saf. 2002;25: Miller SA, Hamilton SL, Wester UG, Cyr WH. An analysis of UVA emissions from sunlamps and the potential importance for melanoma. Photochem Photobiol. 1998;68: Morison WL. Clinical practice: photosensitivity. N Engl J Med. 2004;350: Physicians Desk Reference. 57th ed. Montvale, NJ: Thomson Healthcare Inc; Dereure O. Drug-induced skin pigmentation: epidemiology, diagnosis and treatment. Am J Clin Dermatol. 2001;2: Svensson CK, Cowen EW, Gaspari AA. Cutaneous drug reactions. Pharmacol Rev. 2001;53: Blackshear JL, Randle HW. Reversibility of blue-gray cutaneous discoloration from amiodarone. Mayo Clin Proc. 1991;66: Wolf ME, Richer S, Berk MA, Mosnaim AD. Cutaneous and ocular changes associated with the use of chlorpromazine. Int J Clin Pharmacol Ther Toxicol. 1993; 31: Narurkar V, Smoller BR, Hu CH, Bauer EA. Desipramine-induced blue-gray photosensitive pigmentation. Arch Dermatol. 1993;129: Pepine M, Flowers FP, Ramos-Caro FA. Extensive cutaneous hyperpigmentation caused by minocycline. J Am Acad Dermatol. 1993;28(2, pt 2): Shelley WB, Shelley ED, Burmeister V. Argyria: the intradermal photograph, a manifestation of passive photosensitivity. J Am Acad Dermatol. 1987;16(1, pt 2): Crowson AN, Magro CM. Diltiazem and subacute cutaneous lupus erythematosuslike lesions [letter]. N Engl J Med. 1995;333: Crowson AN, Magro CM. Subacute cutaneous lupus erythematosus arising in the setting of calcium channel blocker therapy. Hum Pathol. 1997;28: Hammentgen R, Lutz G, Kohler U, Nitsch J. Maculopapular exanthema during diltiazem therapy [in German]. Dtsch Med Wochenschr. 1988;113: Lambert DG, Dalac S, Beer F, Chavannet P, Portier H. Acute generalized exanthematous pustular dermatitis induced by diltiazem. Br J Dermatol. 1988;118: Jones SK, Reynolds NJ, Crossley J, Kennedy CT. Cutaneous reaction to diltiazem resulting in an exacerbation of angina. Clin Exp Dermatol. 1989;14: Correction Error in Figure. In the Study by Juarez et al titled Analysis of T-Cell Receptor Gene Rearrangement for Predicting Clinical Outcome in Patients With Cutaneous T-Cell Lymphoma: A Comparison of Southern Blot and Polymerase Chain Reaction Methods, published in the September issue of the ARCHIVES (2005;141: ), an error occurred in the Figure on page In the Figure, 2 line markers in the figure key were reversed. The line markers should have indicated that the poorest survival was in the patients with T3/T4 disease, not the patients with T2 disease. The corrected Figure is reproduced here Cumulative Survival T1 Censored (n = 25) T2 Censored (n = 19) T3/T4 Censored (n = 11) Time, y Figure. Cumulative survival by skin stage category. 210
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