You can re-access respondents from a previous Pulse and ask follow up questions by using the Re-Targeting function.
- Target people who answered this Pulse - selecting this option will let you send a follow-up Pulse to all the respondents of a previous Pulse.
- Target people who answered a specific way - selecting this option will let you re-target people for a follow-up Pulse based on how their answers to the questions in your previous Pulse