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Hyper-CVAD chemotherapy consists of two combinations of drugs (courses A and B) given an alternating fashion. The term 'hyper' refers to the hyperfractionated nature of the chemotherapy, which is given in smaller doses, more frequently, to minimize side effects. 'CVAD' is the acronym of the drugs used in course A: cyclophosphamide, vincristine, doxorubicin (also known as Adriamycin), and dexamethasone. Course B consists of methotrexate and cytarabine. The protocol was originally developed to treat leukemia in young, fit patients, due to its intensity, but has since begun to be used more widely.
Hyper-CVAD chemotherapy is generally reserved for use in the treatment of serious and aggressive forms of hematological malignancy. There are serious side effects and complications arising from the administration of the various agents, which require careful management in an appropriate health-care setting. Patients who receive hyper-CVAD receive a careful work-up to assess their overall wellness prior to the commencement of the regimen, in order to minimise undesirable outcomes. Patients considered for the protocol will generally be under 65.
Each course is given up to 4 times, with up to 8 cycles in total. Each cycle is approximately two to three weeks apart. The aim is to administer as many cycles as possible or necessary in as short a time as possible. Timing of cycles will be somewhat dependent on the patient's recovery from the last cycle. The regimen is usually administered on an in-patient basis, using a continuous venous access device such as a peripherally inserted central catheter (PICC), a hickman line or a port-a-cath. The following is only a general guide (The exact combination of drugs used, doses and protocols used for administration are generally determined on a facility-by-facility basis). Dosage is individualized, based on factors such as body-weight, body surface area and the overall health of the patient.
The side effects of the administration of the chemotherapeutic agents used in hyper-CVAD are complex, and are often dependent on the overall health of the patient.
The majority of patients will experience a degree of pancytopenia, including anaemia, thrombocytopenia, and leukopenia, due to the myelosuppressive effect of chemotherapy. Anaemia and thrombocytopenia can cause clinical problems, and transfusion of red blood cells and platelets may be necessary supportive therapies. Leukopenia, particularly neutropenia may lead to profound compromise of the immune system until the number of neutrophils recovers. Patients must therefore be vigilant to ensure that they report any fevers to their clinician. Anti-infective drugs are commonly given as a prophylaxis during and in-between cycles, to prevent against community acquired infections. Patients are also at risk of hospital acquired infections, such as methicillin-resistant staphylococcus aureus (MRSA) and Vancomycin-Resistant Enterococcus (VRE). It is not uncommon for patients to require hospitalisation to treat infections.
Temporary hair loss is a common side effect. Nausea and vomiting are commonly experienced both during and following administration. A variety of antiemetic drugs may be used, including granisetron, ondansetron, metoclopramide and cyclizine.
Fertility is often compromised following the administration of hyper-CVAD chemotherapy. Patients who wish may elect to store gametes as a contingency.
Peripheral neuropathy may be problematic following the administration of vincristine.