
UNDERSTANDING
PAHWhat Causes PAH and Its Symptoms?
People with pulmonary arterial hypertension (PAH) have an imbalance of natural substances, causing the blood vessels in their lungs to become narrowed.


When these substances are out of balance, blood vessels in the lungs narrow, requiring the right side of the heart to work even harder to pump blood to the lungs.
This can cause symptoms like shortness of breath and fatigue, which may make it difficult to do daily activities. Because PAH is a progressive disease, you may find yourself becoming less active over time.
There are medicines that treat the imbalances, or pathways, associated with PAH.
Healthy vessel: Blood can be pumped easily from the heart to the lungs.
Vessel with PAH: Narrow vessels slow down the flow of blood and make the heart work harder to pump blood to the lungs.
What Is Prostacyclin? [pra·stuh·si·klin]
Prostacyclin is one of the pathways associated with PAH. Prostacyclin helps ensure blood vessels are healthy and stay open, and is important for normal lung function. People who have PAH may not produce enough prostacyclin in their lungs.
What Is the Function of Prostacyclin?
The function of prostacyclin is to help keep blood flowing through your lungs by:
- Widening or opening narrow blood vessels
- Preventing clotting
- Slowing down the thickening of blood vessels
TYVASO Helps to Replace the Natural Prostacyclin You May Be Missing
TYVASO mimics some of the effects of natural prostacyclin, helping to open up blood vessels and keep the blood flowing through your lungs.
How Can TYVASO Help Me?
TYVASO may help you do more in your day and do what matters most.