Search results
Results from the WOW.Com Content Network
In meteorology, a low-pressure area, low area or low is a region where the atmospheric pressure is lower than that of surrounding locations. It is the opposite of a high-pressure area . Low-pressure areas are commonly associated with inclement weather (such as cloudy, windy, with possible rain or storms), [ 1 ] while high-pressure areas are ...
Paroxysmal nocturnal dyspnea or paroxysmal nocturnal dyspnoea (PND) is an attack of severe shortness of breath and coughing that generally occurs at night. [1] It usually awakens the person from sleep, and may be quite frightening. [2]
Cancer prevention is the practice of taking active measures to decrease the incidence of cancer and mortality. [ 1 ] [ 2 ] The practice of prevention depends on both individual efforts to improve lifestyle and seek preventive screening , and socioeconomic or public policy related to cancer prevention. [ 3 ]
[1] [2] It includes a ventilation that generates negative pressure (pressure lower than that of the surroundings) to allow air to flow into the isolation room but not escape from the room, as air will naturally flow from areas with higher pressure to areas with lower pressure, thereby preventing contaminated air from escaping the room.
A low-pressure area is a region where the atmospheric pressure at sea level is below that of surrounding locations. Low-pressure systems form under areas of wind divergence that occur in the upper levels of the troposphere. [1] The formation process of a low-pressure area is known as cyclogenesis. [2]
Tumor stroma and extracellular matrix in hypoxia. Tumor hypoxia is the situation where tumor cells have been deprived of oxygen.As a tumor grows, it rapidly outgrows its blood supply, leaving portions of the tumor with regions where the oxygen concentration is significantly lower than in healthy tissues.
It most often occurs in the middle of the night [3] and lasts from seconds to minutes; [4] pain and aching lasting twenty minutes or longer would likely be diagnosed instead as levator ani syndrome. In a study published in 2007 involving 1809 patients, the attacks occurred in the daytime (33 percent) as well as at night (33 percent) and the ...
Lung cancer is the leading cause of cancer-related deaths in the United States and Europe and is a major cause of death in other countries. [54] Tobacco is an environmental carcinogen and the major underlying cause of lung cancer. [54] Between 25% and 40% of all cancer deaths and about 90% of lung cancer cases are associated with tobacco use.