ECG Tutorial - Introduction. The focus of this introductory ECG tutorial is to provide a tutorial about the main features of ECGs along with a method for analyzing ECGs. This method includes assessment of rhythm, calculating heart rate, observing P-wave forms, measurement of EKG intervals and segments and the evaluation of other relevant waves.
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The Chicago L (short for elevated) is the rapid transit system serving the city of Chicago and some of its surrounding suburbs in the U.S. state of Illinois. It is operated by the Chicago Transit Authority (CTA). It is the fourth largest rapid transit system in the United States in terms of total route length, at 102.8 miles (165.4 km) long, and the third busiest rail mass transit system in the United States after the New York City Subway and Washington Metro.