Steroid Treatment for Sickle Cell Pain Crisis

Overview

The painful episode is the most common problem experienced by children with sickle cell disease. Although various treatments are available during painful episodes, the medication most commonly given for pain is a pain medication such as morphine. Fluids are also used. Even with these treatments, many children still have severe pain that is difficult to control. In addition to pain medications, there are other medications that may be useful. Methylprednisolone (solumedrol) and prednisone are a group of medications called steroids that may be helpful for painful episodes. These medications are known to lower the amount of inflammation (this means swelling, tenderness, and soreness) in the body. Because this medication may help with your pain, you are being asked to be a part of this study. These types of medications are used in other illnesses such as asthma, especially during times when the illness has gotten worse. The main purpose of this study is to see if the methylprednisolone and prednisone will lower the amount of pain and the length of hospital stay. In addition to the pain medication you will normally receive, you will be assigned to one of 2 groups: 1) the experimental group with the active form of the medicine, or 2) a comparison group without the active form of the medicine. In either group, you will still receive all of the treatments you would normally receive for a painful episode, including pain medicines and fluids. You and your doctors will not know what group you will be assigned. If you decide to be a part of the study the following will happen: For the first 5 days, you will be asked to: 1) describe your current pain (0=no pain to 10=a lot of pain), worst pain (0=no pain to 10=a lot of pain), least pain (0=no pain to 10=a lot of pain), and the amount of pain relief (0=no relief to 10=complete relief); 2) describe any signs or symptoms you feel, including filling out a pain scale form each day; 3) and take the medicines for 5 days, either at home or when in the hospital. Thirty days after the study, a study researcher will call and will ask questions about your pain, any painful episodes, and any medications you had. If you are discharged home sooner than 5 days after the start of the study, research staff will call you to ask you these questions, remind you to fill out your pain forms, and remind you to take your medicine. If you are discharged home, you will be given pain scales to fill out each day at home.

In the United States, 9% of African Americans have sickle cell trait and 1 in 600 has sickle cell disease. Vaso- occlusive crises in sickle cell disease remain a frequent cause of severe pain, leading to emergency room visits, hospitalizations, and dependence upon narcotics for analgesia. Current treatments for vaso-occlusive crises includes IV analgesia with narcotics, NSAIDS, and hydration. Admissions can be frequent, prolonged, and can significantly diminish quality of life. Understanding the pathophysiology of vaso-occlusive crises helps to find possible treatments. The etiology of vaso- occlusive crises includes HbS polymerization; sickle erythrocyte polymerization; endothelial damage; and inflammation, reperfusion injury, and oxidant radical production (Steinberg et al, Hematology, 2004). For example, hydroxyurea works by increasing the amount of fetal hemoglobin (HbF) and thus inhibiting polymerization, and reduces the incidence of pain by nearly 50%. Glucocorticoids would be expected to exert effects on the endothelium and inflammation. Vaso-occlusive crises share similar features with other inflammatory processes, including clinical symptoms of swelling, erythema, and warmth; and laboratory findings of leukocytosis and elevated ESR. It has previously been theorized that glucocorticoids, which are used in many other inflammatory disorders, could decrease the duration or severity of vaso-occlusive crises. Methylprednisolone is a corticosteroid which decreases inflammation by suppression of migration of polymorphonuclear leukocytes and reversal of increased capillary permeability (Takemoto, et al 2004). A randomized, placebo-controlled study of 2 doses of intravenous methylprednisolone for vaso-occlusive crisis showed that the duration of severe pain and the need for inpatient analgesia was decreased in patients who received methylprednisolone; however the intervention patients had more rebound attacks than those who received placebo. (Griffin et al, NEJM, 1994) Previous studies have examined long-term administration of steroid hormones including testosterone, progesterone, and medroxyprogesterone to patients with sickle cell disease. In placebo-controlled crossover trials, patients who received steroids had fewer vaso-occlusive episodes than placebo-treated patients (Isaacs et al, Lancet,1972; DeCeulaer et al, Lancet, 1982). Initial reports of glucocorticoids for vaso-occlusive crisis include an uncontrolled report of hydrocortisone as adjunctive therapy for VOC (Araujo et al, Blood, 1990). A case report showed efficacy of dexamethasone for vaso-occlusive crisis in children (Robinson et al, Lancet, 1979). The mechanism of steroids effect is uncertain. In acute chest syndrome, which shares many clinical features with vaso-occlusive crises, intravenous therapy with dexamethasone has been shown to reduce the length of hospital stay, prevent clinical deterioration, and reduce the need for blood transfusion (Bernini et al, Blood, 1998). In a placebo-controlled trial of high-does methylprednisolone for VOC, patients with severe pain requiring hospital admission were randomized to receive methylprednisolone or placebo (15 mg/kg to maximum 1 gram) at admission and again 24 hours later. The duration of inpatient analgesia was significantly shorter in patients who received methylprednisolone. However, patients who received methylprednisolone were much more likely to be readmitted shortly after finishing therapy. In addition, the study was criticized because patients did not rate their pain, and very few patients received patient-controlled analgesia while hospitalized. Since this trial was published, there have been other advances in the standard management of VOC. Ketorolac, a non-steroidal analgesic, is now a standard adjunctive therapy, and most patients are quickly placed on patient-controlled analgesia. In addition, more patients now receive chronic, preventative therapies such as hydroxyurea and chronic transfusions. We are therefore interested in repeating and expanding upon the results obtained several years ago and in evaluating the role of steroids if given over a slightly longer period of time. The primary objective of this study is to determine whether the use of high-dose methylprednisolone followed by steroid taper decreases the duration of hospitalization and severity of pain in VOC of sickle cell disease. Primary Hypothesis: The experimental group treated with high-dose methylprednisolone and steroid taper plus conventional therapy will have an improvement in pain scores using a 10-point scale. In addition, the secondary objectives were: 1. duration of inpatient admissions 2. to examine the number and type of complications and side effects (infection, hypertension, and GI bleeding) 3. to determine rate of recurrent episodes of pain within one month of treatment. 4. to determine whether the amount of analgesic used will decrease during the hospitalization, as measured by the # of days in which IV opioids were given.