Final answer:
A nurse should monitor a client with hypomagnesemia caused by long-term therapy with lansoprazole for manifestations such as hypocalcemia.
Step-by-step explanation:
Hypomagnesemia is a condition characterized by low levels of magnesium in the blood. It can be caused by long-term therapy with lansoprazole, a medication that reduces stomach acid production.
One of the manifestations that the nurse should monitor for in a client with hypomagnesemia is hypocalcemia, which is characterized by low levels of calcium in the blood.
Hypocalcemia can disrupt normal body functions such as blood coagulation, muscle contraction, nerve functioning, and bone strength.