Treatment requires diuretics (to decrease strain on the heart).[1] Oxygen is often required to resolve the shortness of breath. Additionally, oxygen to the lungs also helps relax the blood vessels and eases right heart failure.[16] When wheezing is present, the majority of individuals require a bronchodilator.[1] A variety of medications have been developed to relax the blood vessels in the lung, calcium channel blockers are used[17] but only work in few cases and according to NICE are not recommended for use at all.[18]