Final answer:
The nurse should consider administering another nitroglycerin tablet and obtaining an ECG to monitor for ongoing ischemia, while also preparing for possible additional interventions.
Step-by-step explanation:
The nurse should take into consideration that the patient with unstable angina has reported a significant decrease in chest pain severity, from a 6 to a 2 on a 0 to 10 scale, after administering sublingual nitroglycerin. Given the improvement but the continuation of some pain, it is appropriate to administer another nitroglycerin tablet if the protocol allows for it and to monitor the patient closely. It is also essential to obtain an ECG to assess for any changes that might indicate an ongoing ischemic process or the development of an acute myocardial infarction (MI). Initiation of a peripheral IV may be warranted for potential administration of further medications, while calling the Rapid Response Team would depend on any deterioration of the patient's condition or failure to improve with additional nitroglycerin administration.