Final answer:
Mr. Henderson may be experiencing anaphylaxis, which can cause respiratory distress and should be treated with epinephrine. It is not cardiac arrest, as he still has a pulse, and not likely choking or hypoglycemia.
Step-by-step explanation:
If Mr. Henderson is not breathing normally but has a pulse, he may be experiencing anaphylaxis. Anaphylaxis can result in respiratory distress, and plummeting blood pressure, among other symptoms.
It is different from cardiac arrest, where there would be no pulse because the heart is no longer pumping blood effectively. Cardiac arrest is a medical emergency requiring immediate intervention.
Choking is characterized by an inability to speak or cry out, and a person often clutches at their throat; with choking, oxygen deprivation could lead to unconsciousness if not resolved quickly.
Hypoglycemia does not typically present with respiratory distress as a primary symptom. Furthermore, anaphylactic shock is treated with epinephrine, which helps to counter the blood pressure and breathing effects.