Clash Of the Sisters
Wednesday, September 3, 2008
Watch Live Streaming Of US Open
The US Open tennis tournament is one of the oldest tennis championships in the world, first contested in 1881.
The tournament is chronologically the fourth and final event of the Grand Slam tennis tournaments. It is held annually in August and September over a two-week period (the weeks before and after Labor Day weekend). The main tournament consists of five championships: men's and women's singles, men's and women's doubles, and mixed doubles, with additional tournaments for senior, junior, and wheelchair players. Since 1978, the tournament has been played on acrylic hard court at the USTA Billie Jean King National Tennis Center at Flushing Meadows-Corona Park in the Queens borough of New York City.
The tournament is chronologically the fourth and final event of the Grand Slam tennis tournaments. It is held annually in August and September over a two-week period (the weeks before and after Labor Day weekend). The main tournament consists of five championships: men's and women's singles, men's and women's doubles, and mixed doubles, with additional tournaments for senior, junior, and wheelchair players. Since 1978, the tournament has been played on acrylic hard court at the USTA Billie Jean King National Tennis Center at Flushing Meadows-Corona Park in the Queens borough of New York City.
ECG Graph Paper
Timed interpretation of an EKG was once incumbent to a stylus and paper speed. Computational analysis now allows considerable study of heart rate variability. A typical electrocardiograph runs at a paper speed of 25 mm/s, although faster paper speeds are occasionally used. Each small block of ECG paper is 1 mm². At a paper speed of 25 mm/s, one small block of ECG paper translates into 0.04 s (or 40 ms). Five small blocks make up 1 large block, which translates into 0.20 s (or 200 ms). Hence, there are 5 large blocks per second. A diagnostic quality 12 lead ECG is calibrated at 10 mm/mV, so 1 mm translates into 0.1 mV. A calibration signal should be included with every record. A standard signal of 1 mV must move the stylus vertically 1 cm, that is two large squares on ECG paper.
ELECTROCARDIOGRAM
Tuesday, September 2, 2008
The Electrocardiogram commonly called the ECG or EKG was invented by Williem Einthoven.Einthoven assigned the letters P, Q, R, S and T to the various deflections, and described the electrocardiographic features of a number of cardiovascular disorders. In 1924, he was awarded the Nobel Prize in Medicine for his discovery.
An electrocardiogram (ECG or EKG, abbreviated from the German Elektrokardiogramm) is a noninvasive transthoracic graphic produced by an electrocardiograph, which records the electrical activity of the heart over time. Its name is made of different parts: electro, because it is related to electrical activity, cardio, Greek for heart, gram, a Greek root meaning "to write". In the US, the abbreviation "EKG" is often preferred over "ECG", while "ECG" is used universally in the UK and many other countries. It is preferred as "EKG" in the US because doctor's handwritting of "ECG" can often be confused as "EEG" when transcribing orders or with echocardiography which is also abbreviated "ECG".
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