With an ultra-high dividend yield in excess of 18%, it's no surprise that many investors are buying Medical Properties Trust (NYSE: MPW) stock over the last few weeks. But where there are high dividend yields, there's usually plenty of risk to go around, so it's key to understand how likely it is that the company will be able to sustain itself moving forward.

Let's dive in and analyze what this real estate investment trust (REIT) needs to do over the next five years to shed some light on the issue.

Medical Properties Trust buys hospitals and rents them out, and then passes on the excess rental income to investors via its dividend. 

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Source Fool.com