"If permanent unavailability occurs during his last two years, the Executive Vice President shall complete the term of office."
Article 234 states:
"A President of the Republic who becomes temporarily unavailable to serve shall be replaced by the Executive Vice President for a period of up to 90 days, which may be extended by resolution of the National Assembly for an additional 90 days."
"If the temporarily unavailability continues for more than 90 consecutive days, the National Assembly shall have the power to decide by a majority vote of its members whether the unavailability to serve should be considered permanent."
Under Article 235, "The absence of the President of the Republic from the territory of Venezuela requires authorization from the National Assembly or the Delegated Committee, when such absence continues for a period exceeding five consecutive days."
Chavez may need more recovery time. Aides want swearing-in postponed. Venezuelans overwhelmingly elected him. If able, they want him to serve. Constitutional interpretation has wiggle room.
Article 231 states:
"The candidate elected shall take office as President of the Republic on January 10 of the first year of his constitutional term, by taking an oath before the National Assembly."