Case continued
Mr. Williams completed treatment for MSCC but was still complaining of extreme lethargy and noticed an increase in thirst and no bowel movement in 5 days. His serum calcium was 14 mg/dL.
Hypercalcemia of malignancy
HCM is the most common paraneoplastic syndrome, observed in nearly 30% of patients with advanced cancer. It is a poor prognostic indicator, and approximately half of all patients with HCM will die within 30 days.8 Cancer is the most common reason for hypercalcemia in the inpatient setting9 and is most often associated with multiple myeloma, non–small cell lung cancer, breast cancer, renal cell carcinoma, non-Hodgkins lymphoma, and leukemia.
Hypercalcemia most often presents with cognitive changes and lethargy, anorexia, nausea, constipation, polyuria and polydipsia, and renal failure. Bradycardia and shortened QT interval are seen more with severe hypercalcemia.
Management of hypercalcemia of malignancy
Management of HCM depends on corrected calcium or ionized calcium levels, chronicity, degree of symptoms, and presence of renal failure. In general, mild asymptomatic hypercalcemia can be managed with outpatient care. Serum calcium greater than 14 mg/dL should be treated regardless of symptoms (Table 1).
For mild to moderate HCM, management involves saline administration to achieve euvolemia and calcitonin, which has temporizing effects. Early administration of IV bisphosphonates for moderate to severe HCM is beneficial because onset of action is 24-48 hours. Furosemide for management of HCM has fallen out of favor unless the patient develops hypervolemia. Denosumab has been Food and Drug Administration–approved for HCM refractory to bisphosphonate therapy and can manage HCM in 64% of patients who did not respond adequately to bisphosphonate therapy.10 Because it can be used in advanced renal failure without dose adjustment, it is first-line therapy in this population, although the risk for hypocalcemia is increased in renal failure. For patients with serum calcium greater than 18 mg/dL, worsening renal failure, or inability to tolerate IV fluids, dialysis with a low-calcium bath should be considered (Table 2).
Zoledronic acid versus pamidronate
A single dose of zoledronic acid normalizes the serum calcium concentration in 88% of patients, compared with 70% of those who received pamidronate, in a pooled analysis of two phase 3 trials.11 The median duration of normocalcemia was longer for those receiving zoledronic acid (32-43 days vs. 18 days). The efficacy of the 4-mg and 8-mg zoledronic acid doses were similar, but the 4-mg dose was recommended because of renal toxicity and increased mortality associated with the higher dose.Despite this data, many specialists maintain that pamidronate, which is less expensive, is of similar clinical efficacy to ZA.12
Key takeaways
Management of HCM should be determined by the severity of the calcium level. The mainstay of treatment includes hydration with normal saline, calcitonin ,and bisphosphonate therapy; zoledronic acid is preferred over pamidronate. For patients refractory to bisphosphonates or patients with renal insufficiency, denosumab should be used.
Case continued: Febrile neutropenia
Febrile neutropenia is defined as a single oral temperature of 100.9° F or a temperature of 100.4° F sustained over a 1-hour period in a patient with absolute neutrophil count (ANC) less than 1,000 cells/mL or ANC expected to decrease to less than 500 cells/mL within a 48-hour period.13 Up to 30% of patients with solid tumors develop febrile neutropenia after chemotherapy, and nearly 80% of patients with hematologic malignancy or after hematopoietic stem cell therapy (HSCT) experience it.
Even though an infectious etiology is identified in only 30%-40% of cases, all patients with febrile neutropenia should initially receive at least empiric gram-negative coverage. The mortality rate is nearly 70% in neutropenic patients who do not receive empiric antibiotics and is reduced to 4%-20% with antibiotics.14
Risk stratification for febrile neutropenia and early discharge
Talcott’s Rules, the Multinational Association for Supportive Care in Cancer (MASCC) score, and the Clinical Index of Stable Febrile Neutropenia (CISNE) are validated tools to determine low-risk febrile neutropenia patients (Tables 3 and 4). The Infectious Diseases Society of America guidelines validated the use of MASCC in 2002 but found that CISNE had better performance than other tools. Coyne and colleagues conducted a retrospective cohort study to assess these two risk stratification tools in the ED and found that the CISNE was 98.3% specific for identifying adverse outcomes, whereas the MASCC was 54.2% specific.15
A study by Talcott and colleagues used Talcott’s Rules to identify low-risk febrile neutropenia patients, who were randomized to early discharge with home intravenous antibiotics versus continued inpatient management. There were no significant differences in the primary outcomes, defined as any change in clinical status requiring medical evaluation.16 Another study suggested that discharge after 24 hours based on clinical stability with outpatient oral antibiotics were noninferior to standard inpatient and intravenous antibiotic therapy.17 A Cochrane review in 2013 of 22 randomized controlled trials determined that oral antibiotics were an acceptable treatment for low-risk patients.18
Key takeaways
Though the MASCC is highly sensitive in identifying low-risk febrile neutropenia patients, it should be used with clinical caution because up to 11% of patients characterized as low risk developed severe complications.19 If a low-risk patient with solid tumor malignancy has adequate home support, lives within an hour of the hospital, and has access to follow-up within 72 hours, oral antibiotics and early discharge can be considered.
Dr. Chokshi is assistant professor in the division of hospital medicine at Mount Sinai Hospital, New York. Dr. Smith is associate professor in the division of hematology/oncology at Mount Sinai Hospital.
QUIZ
Mrs. Smith is a 64-year-old woman with endometrial cancer with temperature of 100.4° F at home. She takes no antibiotics, has no other medical history, and was sent in from clinic and admitted for further management. She feels well, and preliminary infectious workup is negative. She has been afebrile for more than 24 hours, and her ANC is 600 cells/mL.
Her son’s soccer game is tomorrow, and she would like to be present. Her family is involved in her care. Under what conditions can she be discharged?
A. She should not be discharged until full course of empiric intravenous antibiotics is completed.
B. Consider discharge in another 24 hours if she remains afebrile.
C. Discharge if low risk by MASCC or CISNE, with oral doses of levofloxacin or moxifloxacin or oral ciprofloxacin and amoxicillin/clavulanic acid.
Answer: C. The patient has a solid tumor malignancy, is low risk by both MASCC and CISNE, and can most likely be discharged if she is clinically stable or improved. A 7-day course of antibiotics is recommended with close follow-up.
References
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