Irvine-based medical device maker Masimo Corp. on Tuesday posted a first-quarter profit in line with Wall Street while revenue topped expectations.

Masimo makes patient monitoring devices that measure things such as oxygen and hemoglobin.

The company’s profit rose 26% to $18 million from a year earlier.

Analysts expected Masimo to post an $18.3 million profit in the first quarter.

First-quarter revenue came in at $113 million, up 14% from 2010’s first quarter. Wall Street expected Masimo’s revenue to come in at $110.7 million.

Masimo, as is its custom, didn’t give an outlook for the current quarter in its earnings release.

Analysts expect the company to post a profit of $17.7 million in the second quarter.

Masimo's second-quarter revenue is seen as coming in at $111.6 million.