Comparison of Two Modes of Respiratory Physiotherapy in Cardio-thoracic Surgical Patients

Inclusion Criteria: * cardiothoracic operation, * informed consent Exclusion Criteria: * reduced co-operation (such as psychiatric diagnosis), * severe neurologic disease affecting respiratory function, * alcohol or drug abuse at hospital entry, * tuberculosis or other contagious lung infection, * severe respiratory insufficiency SpO2 \< 90 or blood pO2 \<8 or rep.rate \> 25/min at rest or supplementary oxygen required at home, * cardiac pacemaker.