How to execute runCommand with Mongoose?

I am using Node.js and Mongoose to access my MongoDB. I am using a model that stores some geo coordinates. I have them indexed and everything seems to work as expected. What I am trying to do is to retrieve the most near things from my request. On the MongoDB console I do something like this:

distances = db.runCommand({ geoNear : "deals", near : [11.252, 14.141], spherical : true, maxDistance : 300  }).results 

However, I am not sure how to do this with Mongoose. Here is more information about the command I am trying to use: http://www.mongodb.org/display/DOCS/Geospatial+Indexing

Thanks, Jose