Your 3 year-old patient presents for muscle biopsy with a fa…

Your 3 year-old patient presents for muscle biopsy with a family history of Duchenne muscular dystrophy. Upon induction of general anesthesia and infiltration of the site with 10 mL of 0.2% ropivacaine, the patient becomes tachycardic, hypotensive, and develops peaked T-waves. What is the most appropriate first intervention.