With proper maintenance, itâs possible to extend the life of an engine by a considerable amount, up to 500 hours for regular maintenance, and even up to 1,000 hours for those boaters with the utmost dedication. Maintenance and care will prolong the life of the engine, and overall, save a lot of money.
In medicine, exacerbation may refer to an increase in the severity of a disease or its signs and symptoms. For example, an exacerbation of asthma might occur as a serious effect of air pollution, leading to shortness of breath. Last Editorial Review: 5/13/2016.
An acute exacerbation of COPD is defined as increased shortness of breath, increased sputum production, a change in the color of the sputum from clear to green or yellow, or an increase in cough in someone with COPD.