Final answer:
The most informative nursing note regarding the care of a pressure ulcer is the one stating it is no longer producing purulent drainage, as it provides measurable evidence of improvement.
Step-by-step explanation:
The best evaluation of nursing interventions regarding the care provided for a pressure ulcer on the left heel among the options provided would be option 3: "Pressure ulcer on the left heel is no longer producing purulent drainage." This option provides specific and measurable data indicating a positive response to treatment, which is a key component of effective nursing evaluation. It demonstrates not only an improvement but also a tangible change in the condition of the pressure ulcer, suggesting that the infection might be resolved due to the interventions in place.