Connecticut Rep. John Larson returned to full congressional duties Wednesday after having a seizure two days earlier on the House floor. 

The Democratic lawmaker's office posted a video of him speaking at Capitol Hill hearing held by the Ways and Means Social Security Subcommittee, of which he is a member. 

Two days earlier, the 76-year-old lawmaker stopped speaking while delivering a speech at the lectern on the House floor.

Larson's office initially attributed the incident to an adverse reaction to a medication the lawmaker takes because of a heart valve replacement performed 15 years ago.

On Tuesday, Lawson issued a statement in which he said further tests showed the cause was a "complex partial seizure" but also the shape of his aortic valve that was replaced "can later develop symptoms such as the momentary change in speech or movement that was apparent yesterday."  

He also said doctors prescribed medication that they say will greatly reduce his chance of such an incident reoccurring. 

Complex partial seizures are the most common type of epilepsy in adults and can last 30 seconds to 2 minutes, according to the Cedar-Sinai medical center and academic healthcare group in Los Angeles.