The invention provides methods and devices for treating a patient suffering from heart failure. According to one exemplary method, a facial mask is sealed around the patient's mouth and nose, with the mask including a one-way expiration valve and an inspiratory threshold valve. The threshold valve is...http://www.google.de/patents/US6029667?utm_source=gb-gplus-sharePatent US6029667 - Heart failure mask and methods for increasing negative intrathoracic pressures
