Supporters of the Venezuelan government say they have won a landslide victory in Sunday's congressional election. But only about 25% of registered voters cast a ballot.
The main opposition parties withdrew from the vote, and thousands of soldiers were deployed nationwide to maintain order.
Polling stations in middle class urban areas of Venezuela were almost empty after the opposition parties' withdrawal.
But people queued to vote in more deprived parts of the city where support for Mr Chavez is usually strong.
The Venezuelan president condemned the opposition boycott after casting his vote in Caracas.
The balance of power in parliament is set to shift further in favour of Mr Chavez. But the opposition says the low turnout deprives the vote of legitimacy.