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Letter To Editor
2008:74:4;399-401
doi: 10.4103/0378-6323.42923
PMID: 18797077

Co-occurrence of psoriasis and occlusive vascular disease

Raghavendra Rao, Smitha Prabhu, H Sripathi
 Department of Skin and VD, Kasturba Medical College, Manipal, India

Correspondence Address:
Raghavendra Rao
Department of Skin and V.D. Kasturba Medical College, Manipal, Karnataka- 576 104
India
How to cite this article:
Rao R, Prabhu S, Sripathi H. Co-occurrence of psoriasis and occlusive vascular disease. Indian J Dermatol Venereol Leprol 2008;74:399-401
Copyright: (C)2008 Indian Journal of Dermatology, Venereology, and Leprology

Sir,

Psoriasis is a chronic, immune-mediated disease that has a serious impact on the quality of life in affected patients. [1] Psoriasis patients are also prone to develop various systemic diseases such as diabetes, hypertension and thromboembolism, which might further impair their quality of life. Here, we describe a patient who presented to us with concomitant development of psoriasis and acute limb ischemia.

A 33 year-old male, chronic smoker (since 17 year, approximately half pack of beedis per day) presented with a generalized, scaly rash of one month′s duration and painful, blackish discoloration on the left leg of 25 days′ duration. The lesions started initially on the elbows as scaly plaques. Within a short span, similar lesions appeared on the trunk and the right leg. Almost simultaneously, the patient noticed a painful discoloration on the left leg. There was no history of intermittent claudication. Cutaneous examination revealed the presence of erythematous, scaly papules and plaques distributed on the trunk, upper extremities, the right leg and the left thigh. The lower 1/3 rd of the leg was distinctly spared and this part was cold to touch. A blackish discolouration with peeling of the skin was seen on the first two toes of the left foot, extending proximally up to the ankle [Figure - 1]. Peripheral pulsations could not be felt below the left knee; systemic examination was normal. A diagnosis of psoriasis vulgaris with acute limb ischemia was made. The patient′s routine hemogram showed marked polymorphonuclear leukocytosis and elevated erythrocyte sedimentation rate (ESR). Lipid profile, serum electrolytes, renal and liver function tests were normal. Arterial doppler study showed complete occlusion at the level of the proximal popliteal artery on the left side with no evidence of reformation in the distal arteries. Skin biopsy from the scaly plaque was consistent with a diagnosis of psoriasis. An attempt was made to manage the lesions with a 20 mL/hour heparin infusion 25,000 units in 500 mL of normal saline, but did not help; hence, the left leg was amputated below the knee.

There is mounting evidence to support the hypothesis that psoriatic patients are more prone to develop cardiovascular complications than nonpsoriatic patients. In 1961, Reed et al , proposed an association between psoriatic arthritis and occlusive vascular disease. [2] In a prospective study, Gelfand et al , found that psoriasis confers an independent risk factor for the development of myocardial infarction; the relative risk being the greatest in young patients with severe psoriasis. [3] In their retrospective study, McDonald et al , have found that vascular occlusion (both arterial and venous) was more common among psoriatic than non-psoriatic dermatological patients. [4] They have also observed that such occlusive episodes were more common (37.5%) in patients with definite cardiovascular risk factors such as smoking, than in patients without these risk factors (3.3%). Our patient too was a chronic smoker, which facilitated our diagnosis of vascular disease and its association with the observed psoriasis in our patient, as smoking predisposes the patient to a high risk for thrombus formation.

The exact mechanism by which psoriasis predisposes patients to vascular occlusion is unknown although many theories have been proposed. McDonald hypothesized that vascular occlusion could be related to the increased leukotreine (LTB 4 ) levels in psoriasis. LTB 4 is known to mediate neutrophil chemotaxis, endothelial damage and platelet aggregation, which leads to thrombus formation. [5] Genetic studies have demonstrated that psoriasis and cardiovascular diseases share common pathogenic features in which for example, inflammatory cytokines such as tumor necrosis factor-a (TNF-a) and interleukin-1 (IL-1) play critical roles. [6] Yet another study postulated that the severity of psoriasis (as measured by the psoriatic area severity index) correlated strongly with P-selectin, which is expressed in activated platelets. This has been implicated in the pathogenesis of occlusive vascular diseases in animal models. [7] A recent study has shown that plasma homocysteine levels are raised in psoriasis. [8] Hyperhomocysteinemia is also found in chronic smokers and is an independent risk factor for the development of peripheral vascular disease. Elevated levels of homocysteine are associated with endothelial injury and thrombus formation.

To conclude, psoriatics may have an inherent risk of developing cardiovascular diseases. The problem may be compounded if there are associated risk factors such as smoking. Hence, counseling with the aim of behavioral modification of such risks should be considered as an adjuvant to any therapeutic protocol for patients with psoriasis

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