If you know exactly where you're going, and the path is not itself in flame, and the residual heat+smoke have not yet rendered both your path and your patient's current location unsurvivable, then it is possible.

The movie trope of covering your mouth with a rag and walking through rooms which are actively on fire, trying to find someone who has been inside that same room getting asphyxiated and/or cooked for several minutes is most definitely not real.