The 2018 midterm elections will have some big healthcare consequences.

Democrats won control of the House of Representatives while Republicans strengthened their hold on the Senate. That means Washington gridlock could prevent any big legislative changes.

Also likely off the table is repeal of the Affordable Care Act or big cuts to Medicaid, which were narrowly defeated in the Senate last year.

"We continue to believe a split Congress is the best case scenario for the healthcare sector because it likely means legislative gridlock for the next two years," Cowen analysts Eric Assaraf and Rick Weissenstein wrote in a note Wednesday. "Most notably, it likely puts Obamacare repeal efforts on the shelf until at least 2020, to the relief of hospitals and Medicaid managed care companies."

Some of the biggest healthcare changes will likely come on the state level. Voters in three states voted to make more low-income people eligible for their state Medicaid programs under the Affordable Care Act. Democratic victories in governor races in states like Wisconsin and Kansas could lead those states to expand Medicaid, too.

Read more: Midterm key takeaways: Trump's message flops, and Democrats set the stage for 2020

In other states, voters rejected major changes to the way healthcare is paid for and administered, and passed new anti-abortion measures. Here's a roundup of the results.