Management of CRAB Symptoms in Multiple Myeloma

Hypercalcemia Management

Aggressive hydration with normal saline should be initiated immediately to increase calcium excretion and improve renal function in patients with hypercalcemia, as recommended by the International Myeloma Society 1, 2
Bisphosphonates, particularly zoledronic acid, are the cornerstone of hypercalcemia treatment in multiple myeloma, according to the American Society of Clinical Oncology 1, 2
For severe hypercalcemia, consider adding calcitonin for rapid but short-term calcium reduction, as suggested by the National Comprehensive Cancer Network 2
Avoid thiazide diuretics which can worsen hypercalcemia; loop diuretics may be used after adequate hydration, as recommended by the European Society for Medical Oncology 3

Immediate hydration with normal saline and urine alkalinization are essential first steps in managing myeloma-related renal impairment, according to the Kidney Disease: Improving Global Outcomes (KDIGO) guidelines 3
Discontinue all nephrotoxic medications, particularly NSAIDs, which can worsen renal damage, as recommended by the American College of Physicians 1
Bortezomib-based regimens are preferred for patients with renal impairment, as suggested by the International Myeloma Society 1
Consider therapeutic plasma exchange (TPE) in selected cases with high free light chain levels, although its role remains controversial, as noted by the European Society for Medical Oncology 3

Erythropoiesis-stimulating agents can be considered for symptomatic anemia in patients with multiple myeloma, as recommended by the American Society of Clinical Oncology 4
Red blood cell transfusions may be necessary for severe symptomatic anemia or when rapid correction is needed, according to the American Association of Blood Banks 4
The definitive treatment for myeloma-related anemia is effective anti-myeloma therapy, as suggested by the Mayo Clinic 5

Bisphosphonates are indicated for all patients with multiple myeloma and bone disease, as recommended by the International Myeloma Society 6, 7
Whole-body low-dose CT (WBLD-CT) is the preferred imaging modality for detecting and monitoring bone lesions, according to the European Society for Medical Oncology 6, 7
For vertebral compression fractures, consider balloon kyphoplasty or vertebroplasty to stabilize the spine and reduce pain, as suggested by the American Academy of Orthopaedic Surgeons 6
Radiation therapy is effective for localized painful bone lesions or at risk of pathological fracture, as recommended by the American Society for Radiation Oncology 6

Initiate appropriate anti-myeloma therapy immediately, as treating the underlying disease is essential for resolving CRAB symptoms, according to the International Myeloma Society 5
For elderly patients (≥65 years), bortezomib, melphalan, prednisone (VMP) for 8-12 cycles is an alternative option, as recommended by the American Society of Clinical Oncology 1

Regular monitoring of serum calcium, renal function, complete blood count, and bone disease is essential, as recommended by the International Myeloma Society 4
Repeat imaging with WBLD-CT or MRI to assess response of bone lesions to therapy, according to the European Society for Medical Oncology 7
Monitor for complications of therapy, including thromboembolic events, peripheral neuropathy, and infections, as suggested by the American Society of Clinical Oncology 8

Patients with renal failure at presentation should be treated as a medical emergency, according to the Kidney Disease: Improving Global Outcomes (KDIGO) guidelines 3
Avoid unnecessary bone marrow biopsies and imaging in patients with established diagnosis, as recommended by the American Society of Clinical Oncology 4