Use Case C to Answer the Following Questions

Use Case C to answer The Following questions
CASE C
A 61-year-old male client expresses concern over receiving an injection of local anesthesia for periodontal debridement. The client explains that he had a bad experience many years ago. The client has a history of smoking, high blood pressure, and coronary atherosclerosis. He takes a calcium channel blocker medication. Vital signs obtained at the start of the appointment were blood pressure of 146/92 mm Hg; pulse rate of 66, regular; and respirations at 16 per minute. The hygienist begins treatment but stops when the client states that the procedure hurts during debridement. After a discussion with the client and the dentist, the hygienist administers a posterosuperior alveolar (PSA) nerve block depositing of a cartridge of lidocaine with epinephrine 1:100,000. The dental hygienist reassures the client while administering the anesthetic and monitors him during the onset of anesthesia. After a few minutes, the client complains of a squeezing pressure or tightness in his chest. The dental hygienist discontinues treatment and raises the chair to a semi-sitting position for client comfort. The client is experiencing some difficulty breathing.
-If this victim loses consciousness and is not breathing, which one of the following actions should occur first?

A) Activate the EMS, and open the airway
B) Activate the EMS, obtain a defibrillator, check for a pulse, and begin chest compressions if no pulse is present
C) Activate the EMS, and begin CPR starting with respirations
D) Check radial pulse, and begin chest compressions if no radial pulse is present