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Glossary

Terms

D


Diaphragm
A muscle that sits below the lungs; when it contracts it helps the lungs expand and take a breath in
Diastole
The period of time when the heart is relaxing, filling with blood and getting ready to contract again
Diastolic blood pressure
(the bottom number of the reading) is measured during diastole.
Diffusing capacity (also known as DLCO)
One of the PFTs which measures how well oxygen and carbon dioxide transfer from the air in your lungs into the bloodstream and vice versa.
Diffusion impairment
A characteristic of gas exchange in PAH in which the movement of oxygen from alveoli to capillaries is reduced
Diuretics
Medications used to rid the body of excess fluid
Dyspnea
Shortness of breath, or any uncomfortable sensation of breathings; typically worsens with exertion