Analysis of the waking EEG of a newborn infant indicates that delta wave activity is predominant in that age, and still appears in a waking EEG of five-year-olds. Delta wave activity during slow-wave sleep declines during adolescence, with a drop of around 25% reported between the ages of 11 and 14 years.
Angina-or angina pectoris (Latin for squeezing of the chest) - is chest pain, discomfort, or tightness that occurs when an area of the heart muscle is receiving decreased blood oxygen supply. It is not a disease itself, but rather a symptom of coronary artery disease, the most common type of heart disease.ngina is most frequently the result of underlying coronary artery disease. The coronary arteries supply the heart with oxygen rich blood. When cholesterol aggregates on the artery wall and hard plaques form, the artery narrows.
Causes of Variant (Prinzmetal) Angina: The pain from variant angina is caused by a spasm in the coronary arteries (which supply blood to the heart muscle). The coronary arteries can spasm as a result of:Symptoms of Variant (Prinzmetal) Angina: The pain or discomfort: Treatment of Variant Angina | Prinzmetal's Angina.Medicines can help control the spasms. Drugs such as calcium antagonists and nitrates are the mainstays of treatment.nlike typical angina â which is often triggered by exertion or emotional stress-Prinzmetalâs angina almost always occurs when a person is at rest, usually between midnight and early morning. These attacks can be very painful. Prinzmetal angina may also be referred to as: 1  Variant angina. 2  Prinzmetal's variant angina.