Another good option would be Joseph Varon's Handbook of Practical Critical Care Medicine.
If you're going to buy a crit care handbook it should be one of these.great resource I have been an nurse in a critical care area for over 5 years, this book tells you what you need to know in a concise way, and leaves all the non-essential information out. If you want to know th quick answer without reading a bunch of fluff, this is the book for you.