Patient safety mechanism which gives patients the right to seek a second opinion having ‘lifesaving impact’, says health secretary‘I am invoking Martha’s rule’: how a woman saved her father from near death in hospitalMore than 500 people have received potentially life-saving care thanks to Martha’s rule, which gives hospital patients the right to seek a second opinion about their health.They were moved to intensive care or a specialist unit after they, a loved one or a member of NHS staff trigge