Final answer:
In a patient with myxedema coma, one would most likely see decreased reflexes due to the severe deficiency of thyroid hormone, which characterizes this advanced stage of hypothyroidism.
Step-by-step explanation:
Patients with myxedema coma, a severe form of hypothyroidism, would most likely present with decreased reflexes. Myxedema coma is a life-threatening condition characterized by a severe deficiency of thyroid hormone. It's marked by mental deterioration, hypothermia, hypoventilation, and cardiovascular collapse. Symptoms and signs specific to hypothyroidism include decreased body temperature, decreased mental activity, and potential weight gain and cold sensitivity. Therefore, the correct option from the given choices is decreased reflexes. Other signs would include bradycardia (opposite of tachycardia), hypoventilation (opposite of hyperventilation), and hypothermia (opposite of hyperthermia).