A 75-year-old patient clutches his chest and falls down. A physician arrives on the scene and finds the patient unresponsive with no breathing effos. What is the first thing to be done by the physician?

Evaluation and Initiation of CPR -Check for response -Call for help or ask someone to call local emergency number -If aspiration or airway obstruction is suspected then Hemlich maneuver should be performed to dislodge obstructing body. -Check for pulse(no longer than 10 sec) -Assess breathing -Chest compressions should be initiated without delay. Note : Cpr protocol C-A-B