Other Categories of Pulmonary Hypertension
Aside from the main classifications of pulmonary hypertension, the World Health Organization (WHO) recognizes three additional groups. Group 3 refers to pulmonary hypertension caused by hypoxia, which is particularly prevalent among individuals with lung diseases such as chronic obstructive pulmonary disease (COPD) or any condition that leads to scarring and lung damage. On the other hand, Group 4 pulmonary hypertension occurs as a result of chronic clotting in the pulmonary vessels. Lastly, Group 5 encompasses a miscellaneous category of pulmonary hypertension where the exact causes remain unclear.
Changes in the Heart and Lungs
Understanding the Impact of Pulmonary Hypertension on Cardiovascular System
When it comes to pulmonary hypertension, the changes that occur in the heart and lungs are fairly consistent across different types of the condition. The primary alteration is observed in the pulmonary arteries, responsible for carrying blood from the heart to the lungs, which start to narrow. This narrowing restricts the smooth flow of blood, leading to an increase in pressure and exerting strain on the right side of the heart.
As the right ventricle receives deoxygenated blood from the body and pumps it into the lungs, it is forced to work harder to overcome the heightened pressure caused by the narrowed arteries. Over time, this excessive workload weakens the right ventricle, reducing its ability to adequately pump blood to the lungs. Consequently, right-sided heart failure occurs, as the weakened ventricle fails to deliver a sufficient blood supply to the lungs.