If you're going to go to the effort of planning a verbal (i.e. text) lecture, and then re-encoding it as slideshow, all for the purpose of getting students something to review... why not just write down your plan for the lecture--a transcript of what you're going to say--and then email it to the students?
In fact, ideally, do this before the lecture. That way, many of the students will have already read through it once, and will be able to ask more thoughtful questions.