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Coagulative Disorders in HIV-Infect­ed Patients Leading to Hemorrhagic Condition

Thrombocytopenia

The most frequent hemorrhagic condition associated with HIV infection is thrombocy­topenia [57]. Although often asymptomatic, thrombocytopenia may be linked to a vari­ety of bleeding abnormalities.

The underly­ing pathophysiology includes accelerated peripheral platelet destruction and decreased (“ineffective”) production of platelets from the infected megakaryocytes. In drug users, the disease appears to be of more rapid progression and more frequently complicated. HIV-associated thrombocy­topenia responds to antiretroviral therapy, but this is less effective in drug users [58]. Some studies have evaluated the use of zidovudine (AZT) and have shown increased platelet production. HAART induces a sus­tained platelet response in HIV-associated thrombocytopenia, even in antiretroviral- experienced subjects and in those with AZT-resistant thrombocytopenia (Table 2) [59]. If antiretroviral agents fail to improve the platelet count or if antiretroviral agents cannot be used, other treatments, similar to those used in “classic” immune thrombocy­topenia (ITP), can be employed, including steroids and intravenous immunoglobulins

Fig.4a,b Photomicrographs of bone marrow core biopsy. a Paratrabec- ular aggregates of erythroid pre­cursor cells as seen in myelodys­plasia. H&E, ? 400. b Hypercellu- larity with erythroid and mega­karyocytes hyperplasia. PAS, ? 400. (From [56], with permission of Wi­ley-Liss, Inc., a subsidiary of John Wiley & Sons, Inc.)

(intravenous anti-D). Splenectomy has been used to treat HIV-infected patients with refractory thrombocytopenia. Although it is an effective treatment, there are concerns about infections and selection of appropri­ate candidates. Other treatment modalities, such as interferon, vincristine, danazol, low- dose splenic irradiation, and staphylococcal protein A immunoadsorption have shown limited success in HIV-associated thrombo­cytopenia.

Alternatively, thrombocytopenia in HIV-infected patients may be treated with pharmacological hyperstimulation of megakaryocytopoiesis (administration of PEG-rHuMGDF or TPO). The latest evi­dence indicates that the chemokine recep­tor CXCR4 (co-receptor for the cellular entry of lymphotropic HIV strains) is expressed on megakaryocytes; as a result, the development of chemokine receptor antagonists may modify the course of the disease.

Table 2 Platelet and CD4+ response to antiretroviral therapy in 34 HIV-infected patients with severe thrombocytopenia. (From [59], with permission from the British Infection Society)

Variable No. of patients Baselinea Treatr

3rd montl

ent

h

a

6th ronth

Overallb c2 p 0 -3rd ronthc

p

3rd-6th ronthc

p

HAART treatment 15
PLT count (PLT x 10 9 /1) 32 87 108 10.53 0.01 0.01 NS
(6 -49) (34 - 259) (20 -195)
CD4+(cells∕μl) 58 127 142 8.1 0.02 0.05 NS
(1 -392) (10 - 503) (4 -387)
AZT treatment 19
PLT count (PLT x 10 9 /1) 29 49 79 20.63 0.001 0.01 NS
(6 -47) (12 - 429) (9 -253)
CD4+(cells∕μl) 96 144 99 6.63 0.03 0.01 NS
(9 -177) (16 - 528) (15 -378)

aValues of each variable are median (range); bFriedmann test; cWilcoxon-Wilcox test

Increased Hemorrhagic Tendency and Hemophiliac HIV Patients

One concerning side effect of HAART is the increased hemorrhagic tendency of hemo­philiac patients contaminated and treated for HIV.

Shortly after the introduction of PIs for the treatment of HIV infection, an association between these drugs and an increased bleeding tendency in patients with hereditary bleeding disorders was observed. The patients experience not only an increased bleeding frequency in usual sites, but bleeding can also occur in unusu­al sites such as the finger joints. Mucus membrane bleeding and hematuria are also common. Ritonavir appears to be associated with the highest risk of bleeding followed by indinavir. PI-associated bleeds tend to be more resistant to factor VIII concentrate treatment, and periods of prophylaxis may be required in individuals with frequent persistent bleeding. Patients continuing PI therapy tend to develop a tolerance to this adverse effect over time. The mechanism of the bleeding tendency has not been eluci­dated. There is no consistent evidence of a disturbance of coagulation, fibrinolysis, or platelet function, which raises the possibili­ty that PIs may exert a direct local effect on blood vessels. It is very important that this class-specific side effect is recognized and understood by both the physicians and the patients [52].

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Source: Barbaro Giuseppe, Boccara Franc (eds.). Cardiovascular Disease in AIDS. 2nd edition. — Springer,2009. — 169 p.. 2009
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