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.
PV is a specific type of myeloproliferative neoplasm, or MPN. It is a rare, chronic. blood cancer in which a personâs body makes too many red blood cells and may. also result in too many white blood cells or platelets. Too many red blood cells can cause the blood to thicken. This can lead to blood. clots that block the flow of blood through the arteries and veins. A heart attack.