Decongestants should be used with caution in patients with which diagnoses?

Decongestants can increase blood pressure and heart rate, hence caution is needed in hypertension (B) and heart disease (D) patients. In diabetes (A), hyperthyroidism (C), and allergic rhinitis (E), decongestants are generally considered safe. For (A), decongestants may affect blood sugar levels but not significantly to warrant caution. For (C), decongestants do not directly impact thyroid function. For (E), decongestants are commonly used to relieve nasal congestion in allergic rhinitis. Therefore, choices B and D are correct due to the potential cardiovascular effects, whereas choices A, C, and E are incorrect as decongestants are usually safe in these conditions.