Mumbai police provided security to Patil, the legislator from Kagwad in Belgaum district, who arrived in Mumbai on Thursday and was hospitalised after he complained of chest pain.
However, Patil, in a video message on a social networking site, said no one had kidnapped him.
20 lawmakers did not turn up on Thursday, including 17 from the ruling coalition, 12 of whom are corralled in a hotel in Mumbai, as the House debated in a surcharged atmosphere.
Facing a truncated strength caused by the en masse resignation of 16 ruling coalition MLAs, Kumaraswamy moved a one-line motion, saying the House expressed confidence in the 14-month old ministry headed by him.