A medical system for determining a treatment regimen for a patient with a condition, the system comprising: a sensing device including a pressure sensor for monitoring and providing RVP information representative of right ventricle heart pressures over a period of time, wherein at least the pressure sensor is configured for implantation into a right ventricle of the patient's heart; one or more processors, coupled to receive the RVP information, configured to: determine a right atrial filling pressure based on the RVP information; and determine a left atrial filling pressure based on the RVP information; a memory unit configured to store the right atrial filling pressure, the left atrial filling pressure and the condition of the patient; the one or more processors configured to receive the condition of the patient, and produce an indication of a treatment regimen for the patient based upon the condition of the patient, the right atrial filling pressure, and the left atrial filling pressure; and a display device configured to display the indicated treatment regimen, right atrial filling pressure and the left atrial filling pressure, wherein the condition is at least one selected from the group of: left heart failure, right heart failure, and primary pulmonary disorder. a sensing device including a pressure sensor for monitoring and providing RVP information representative of right ventricle heart pressures over a period of time, wherein at least the pressure sensor is configured for implantation into a right ventricle of the patient's heart; one or more processors, coupled to receive the RVP information, configured to: determine a right atrial filling pressure based on the RVP information; and determine a left atrial filling pressure based on the RVP information; a memory unit configured to store the right atrial filling pressure, the left atrial filling pressure and the condition of the patient; the one or more processors configured to receive the condition of the patient, and produce an indication of a treatment regimen for the patient based upon the condition of the patient, the right atrial filling pressure, and the left atrial filling pressure; and a display device configured to display the indicated treatment regimen, right atrial filling pressure and the left atrial filling pressure, wherein the condition is at least one selected from the group of: left heart failure, right heart failure, and primary pulmonary disorder. determine a right atrial filling pressure based on the RVP information; and determine a left atrial filling pressure based on the RVP information; a memory unit configured to store the right atrial filling pressure, the left atrial filling pressure and the condition of the patient; the one or more processors configured to receive the condition of the patient, and produce an indication of a treatment regimen for the patient based upon the condition of the patient, the right atrial filling pressure, and the left atrial filling pressure; and a display device configured to display the indicated treatment regimen, right atrial filling pressure and the left atrial filling pressure, wherein the condition is at least one selected from the group of: left heart failure, right heart failure, and primary pulmonary disorder. a memory unit configured to store the right atrial filling pressure, the left atrial filling pressure and the condition of the patient; the one or more processors configured to receive the condition of the patient, and produce an indication of a treatment regimen for the patient based upon the condition of the patient, the right atrial filling pressure, and the left atrial filling pressure; and a display device configured to display the indicated treatment regimen, right atrial filling pressure and the left atrial filling pressure, wherein the condition is at least one selected from the group of: left heart failure, right heart failure, and primary pulmonary disorder.