A 35-year-old male is lethargic and dehydrated after working at a construction site for 12 hours on a very hot day. You obtain the following vital signs: pulse 136, respirations 22, blood pressure 102/88, and SpO2 100. What is the most likely diagnosis for this patient?
1) Heat exhaustion
2) Heat stroke
3) Dehydration
4) Hypovolemic shock
