<prompt> True statements regarding the respiratory disease isAssessment of pre operative arterial blood gasesOut come depends upon blood gas and pulmonary function testInvolve physiotherapists and anaestheticsAll of the above  <response>: All of the above 188-B L 25thRESPIRATORY DISEASE Blood gases and pulmonary function test are needed to assess severity of problems Stop smoking, continue inhalers at least 4 weeks before surgery Involve physiotherapists and anaesthetics post-operately Avoid respiratory suppressants such as narcotics Mobilise early Give oxygen COPD of any cause, asthma, chest infection or bronchietasis causes increased post operative morbidity A careful history - taking of exercise tolerance, triggering factors and medications will determine the severity Arterial blood gas measurement should be performed prior to major surgery to obtain a baseline and to measure any respiratory failure Pulmonary function tests, peak expiratory flow rate PEFR, vital capacity, and forced expiratory volume in 1 second provide an objective measurements of obstructive restrictive ventilatory defects along with reversibility of the former when treated with bronchodilators. The use of post-operative epidural analgesia is useful 