| OA/BVM | oral airway/bag-valve-mask |
|---|---|
| OAS | old age security; oral allergy syndrome; osmotically active substance |
| OAW | oral airways |
| OC | obstetrical conjugate; occlusocervical; office call; on call; only child; optic chiasma; oral contra... |
| OCA | oculocutaneous albinism; olivopontocerebellar atrophy; oral contraceptive agent |
| pulmonary siderosis | Pneumoconiosis caused by inhalation of iron dust. Synonym: pulmonary siderosis. (05 Mar 2000) |
|---|---|
| pulmonary sinuses | The space at the origin of the pulmonary trunk between the dilated wall of the vessel and each cusp of the pulmonic valve. Synonym: sinus trunci pulmonalis. (05 Mar 2000) |
| pulmonary sling | <radiology> Aberrant course of left pulmonary artery between trachea and oesophagus, may cause obstructive emphysema of the right lung if the right main stem bronchus is compressed (12 Dec 1998) |
| pulmonary stenosis | <cardiology> A congenital or acquired heart valve defect. The abnormal narrowing and ineffective opening of the pulmonic valve. Symptoms include cyanosis and difficulty breathing. Treatment is surgical in most cases of significant valvular stenosis. (27 Sep 1997) |
| pulmonary stretch receptors | Stretch receptors found in the bronchi and bronchioles. Pulmonary stretch receptors are sensors for a reflex which stops inspiration. In humans, the reflex is protective and is probably not activated during normal respiration. (12 Dec 1998) |
| pulmonary subvalvular stenosis | Stenosis of the conus arteriosus (infundibulum) with or without involvement of the pulmonary valve. It is usually associated with a defect in the interventricular septum. (12 Dec 1998) |
| pulmonary sulcus | The deep recess on either side of the vertebral column formed by the posterior sweep of the curvature of the ribs. Synonym: sulcus pulmonalis, pulmonary sulcus. (05 Mar 2000) |
| pulmonary surface of heart | The lateral surface of the heart, directed toward the lungs; on the left it is principally the left ventricular wall; on the right it is the right atrial wall and the upper part of the right ventricular wall. Synonym: facies pulmonalis cordis. (05 Mar 2000) |
| pulmonary surfactants | Lipoproteins in which the lipid moiety is based mainly on lecithin and other phospholipids. They may also contain small amounts of prostaglandins and other compounds. Composition is species dependent. They are secreted by the mitochondria of type II alveolar cells. Surfactants regulate the surface tension of the mucoid layer lining the alveoli. Absence of the surfactants in premature infants results in hyaline membrane disease and in adults in atelectasis. Synthetic pulmonary surfactants have also been prepared and are used therapeutically. (12 Dec 1998) |
| pulmonary surgical procedures | Surgery performed on the lung. (12 Dec 1998) |
| pulmonary transpiration | The passage of water vapor from the blood into the air via the respiratory tract. (05 Mar 2000) |
| pulmonary trunk | Origin, right ventricle of heart; distribution, it divides into the right pulmonary artery and the left pulmonary artery, which enter the corresponding lungs and branch along with the segmental bronchi. Synonym: truncus pulmonalis, arteria pulmonalis, pulmonary artery, venous artery. (05 Mar 2000) |
| pulmonary tuberculosis | Tuberculosis of the lungs. (05 Mar 2000) |
| pulmonary tularaemia | Tularaemia affecting the lungs; tularaemic pneumonia. Synonym: pulmonic tularaemia. (05 Mar 2000) |
| pulmonary valve | <anatomy, cardiology> The heart valve that divides the right ventricle and the pulmonary artery. The pulmonic valve opens when the right ventricle contracts allowing blood to flow into the pulmonary artery. The pulmonic valve on closure prohibits the backwash of unoxygenated blood into the right ventricle. The pulmonic valve has 3 valve cusps. (27 Sep 1997) |