The diseases have been categorized as patches (cause dead spots or patches in the lawn), rings (cause rings of dead or affected grass), or leaf blight (affect individual blades of grass, often over a wide area and no distinct patch or ring pattern may be noticeable).
PVR, abbreviation for pulmonary vascular resistance. To measure changes in blood vessel size or changes in gas volume in the lungs to assist in diagnosing diseases such as deep vein thrombosis (DVT), chronic obstructive pulmonary disease (COPD), and some peripheral vascular disorders. Veins, arteries, and lungs. None.
Pulse Volume Recording. Pulse volume recording (PVR) is a non-invasive imaging test that evaluates the lower or upper extremity blood flow. They are actually the more complete form of ankle brachial index, because they test more areas of the limb and not just the flow at the end. Pulse volume recording is a functional test.