Microvascular angina (MVA) is defined as angina pectoris caused by abnormalities of small coronary arteries. In itsmost typical presentation, MVA is characterized by angina attacks mainly caused by effort, evidence of myocardial ischemia on non-invasive stress tests, but normal coronary arteries at angiography. CLOSE WINDOW ]. Figure 1. Definition and classification of microvascular angina (MVA). In patients with sufficiently typical chest pain and normal coronary arteries, MVA is diagnosed after careful exclusion of other (cardiac and non-cardiac) causes.
Human Population - Biology Encyclopedia Human Population Human population refers to the number of people living in a particular area, from a village to the world as a whole. A secondary meaning of population is the inhabitants themselves, but in most uses population means numbers.
For humans, population density is the number of people per unit of area, usually quoted per square kilometer or square mile (which may include or exclude, for example, areas of water or glaciers). Commonly this may be calculated for a county, city, country, another territory, or the entire world. The world's population is around 7,000,000,000 and Earth's total area (including land and water) is 510,000,000 square kilometers (197,000,000 sq. mi.). Therefore, the worldwide human population density is around 7,000,000,000 Ã· 510,000,000 = 13.7 per km2 (35 per sq. mi).