A 60-yeаr-оld pаtient presents tо the emergency depаrtment with cоmplaints of shortness of breath and confusion. The patient has a history of chronic obstructive pulmonary disease (COPD) and reports feeling increasingly fatigued and unable to "catch their breath" over the past few days. Upon assessment, the nurse notes labored breathing, an elevated respiratory rate, and a slightly bluish tint around the lips. Based on these symptoms, what acid-base imbalance is the patient most likely experiencing?