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Molecular Mechanisms in Pulmonary Hypertension and Right Ventricle Dysfunction
Pulmonary hypertension (PH) is a disorder of the pulmonary vasculature defined by increased mean pulmonary arterial pressure (mPAP) leading to right ventricle (RV) hypertrophy and dysfunction, right-sided heart failure and ultimately death. PH is a common complication of chronic lung diseases (CLD) including idiopathic pulmonary fibrosis (IPF) or chronic obstructive pulmonary disease (COPD) where it is classified as Group 3 PH by the WHO. It can also be associated with cardiovascular conditions such as left-heart disease (classified as Group 2 PH) or appear on its own as pulmonary arterial hypertension (PAH) and classified as Group1 PH. In all of these cases the diagnosis of pulmonary hypertension is strongly associated with increased morbidity and mortality. The focus of this Research Topic is to enhance our understanding of the mechanisms that contribute to the pathophysiology of pulmonary hypertension and right ventricle hypertrophy.
Physiological and Pathological Responses to Hypoxia and High Altitude
The appearance of photosynthetic organisms about 3 billion years ago increased the partial pressure of oxygen (PO2) in the atmosphere and enabled the evolution of organisms that use glucose and oxygen to produce ATP by oxidative phosphorylation. Hypoxia is commonly defined as the reduced availability of oxygen in the tissues produced by different causes, which include reduction of atmospheric PO2 as in high altitude, and secondary to pathological conditions such as sleep breathing and pulmonary disorders, anemia, and cardiovascular alterations leading to inadequate transport, delivery, and exchange of oxygen between capillaries and cells. Nowadays, it has been shown that hypoxia plays an imp...
