EN
Hyperammonemia, a well-known complication
of liver failure causing encephalopathy, has rarely been
reported as a complication of multiple myeloma. We
report four additional cases of hyperammonemia in
patients with treatment refractory multiple myeloma. In
these cases, we found that hyperammonemia remains a
morbid complication of resistant disease without directed
myeloma therapy. Our brief review has reaffirmed that
hyperammonemia is a poor prognostic marker in myeloma
with an undetermined mechanism. This complication’s poor
response to traditional therapies, including rifaximin and
lactulose, prompts our discussion urging early recognition
and myeloma directed therapy. Clinical observations may
support that proteasome inhibitors may be most effective in
the treatment of these patients.