Multiple Myeloma nursing care: what to assess and what to do first

Recognising it at the bedside

Multiple myeloma is a cancer of plasma cells that infiltrate bone marrow and overproduce a single abnormal immunoglobulin, or its light chains, at the expense of normal blood cell production. The bedside picture is dominated by bone pain, most often in the back, ribs or pelvis, that worsens with movement and can be mistaken for simple musculoskeletal strain in an older adult.

Look beyond the pain for the pattern that points to myeloma specifically: unexplained anaemia and fatigue from marrow crowding, recurrent infections from functional antibody deficiency, and pathological fractures from lytic bone lesions that appear on imaging as punched-out defects rather than diffuse osteoporosis. Bence Jones protein in the urine, from free light chains, is a classic though not universal finding.

Why the classic presentation misleads

The temptation is to chase the bone pain as an orthopaedic problem, ordering imaging and analgesia while missing the metabolic picture developing alongside it. Bone destruction releases calcium into the bloodstream, producing hypercalcaemia that presents as constipation, confusion, polyuria and lethargy — symptoms easily attributed to age, dehydration or medication side effects rather than the underlying malignancy.

At the same time, light chains filtered by the kidney are directly nephrotoxic, and the combination of hypercalcaemia, dehydration and light-chain burden drives acute kidney injury that can be the presenting feature before the bone pain is even investigated. A nurse who treats the pain in isolation, without checking calcium and renal function together, risks missing the emergency actually unfolding.

Priority nursing actions

Fluids come first. Aggressive isotonic intravenous hydration is the immediate priority in a newly diagnosed or hypercalcaemic myeloma patient, both to correct hypercalcaemia by promoting renal calcium excretion and to protect kidney function from the light-chain load. Monitor intake and output closely and reassess renal function as hydration progresses.

Institute fracture precautions before ambulating any patient with known lytic lesions — use gentle handling, assistive devices, and avoid twisting movements during transfers, since even routine repositioning can cause a pathological fracture. Manage bone pain proactively with scheduled rather than as-needed dosing where appropriate, since undertreated pain limits mobility and worsens the risk of complications from immobility.

Screen for infection at every contact given the functional immunosuppression from abnormal antibody production, and apply neutropenic precautions if the patient is also myelosuppressed from treatment.

Labs and diagnostics to expect

Expect serum and urine protein electrophoresis to identify the monoclonal (M) protein spike, along with serum free light chain assay, which is often more sensitive for detecting the abnormal clone. Bone marrow biopsy confirms the diagnosis by demonstrating clonal plasma cell infiltration, generally above ten percent, together with evidence of end-organ damage.

Skeletal survey or whole-body low-dose CT and MRI identify lytic lesions, and a nurse should anticipate these rather than routine bone density scans, which are not the diagnostic tool of choice here. Track serum calcium, creatinine, haemoglobin and beta-2 microglobulin as the core panel, since beta-2 microglobulin also carries prognostic weight in staging.

Complications and their early signs

Spinal cord compression from vertebral collapse or an extramedullary plasmacytoma is the complication that cannot wait: new back pain with leg weakness, saddle anaesthesia, or bowel or bladder dysfunction demands emergency imaging and treatment, since delay risks permanent paralysis. Hyperviscosity syndrome, though less common, presents with visual disturbance, headache and bleeding gums from the high protein load thickening the blood.

Renal failure can progress silently if hydration and calcium correction lag, so track creatinine trends rather than a single value. Recurrent infection, particularly pneumonia, remains a leading cause of death in myeloma, making fever in this population a finding that always warrants prompt evaluation rather than watchful waiting.

Teaching that changes outcomes

Teach patients to maintain hydration at home, particularly during hot weather or illness, since dehydration accelerates both hypercalcaemia and renal injury. Reinforce fall and fracture prevention: clear walkways, supportive footwear, and avoiding heavy lifting or high-impact activity given the fragility of affected bone.

Explain the early warning signs that should prompt an immediate call rather than a routine appointment — new or worsening back pain with leg weakness, fever, sudden confusion, or a marked drop in urine output. Patients on bisphosphonates or denosumab for bone protection need dental assessment before starting therapy and ongoing oral hygiene teaching, since osteonecrosis of the jaw is a recognised risk with these agents.