* Shares jump as much as 6 pct to $77.34 (Adds details, CEO comments; updates shares)
April 6 (Reuters) - Ventas Inc, a healthcare real estate investment trust, is buying Ardent Medical Services Inc for $1.75 billion to expand its hospitals business at a time when more Americans are seeking healthcare services under the Affordable Care Act.
Also read: University of Oklahoma president says $1B debt not uncommon
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