Greece has pulled back from the brink of default and averted a broader eurozone crisis after backing sweeping austerity measures in a knife-edge parliamentary vote.

George Papandreou, Greece’s socialist prime minister, won support on Wednesday for €28bn ($40.4bn) of tax increases and spending cuts, with just one of his party’s 155 parliamentary deputies voting against the package demanded by the European Union and International Monetary Fund.

Defeat could have resulted in the country being cut off from outside financial help – and in effect condemned to economic collapse. However, Mr Papandreou’s government faces a further vote on Thursday to secure fast-track implementation of the measures. Party officials expressed confidence that the boost to the government from Wednesday’s victory would help secure another victory – but a defeat could yet derail the country’s hopes of international aid.