When you graph, don't try to plot loads of points. Note that the cosine is at y = 1 when x = 0 and 2Ï; at y = 0 for x = Ï/2 and 3Ï/2, and at y = â1 for x = Ï. Plot these five interesting points, and then fill in the curve.
Transesophageal echocardiogram. A transesophageal echocardiogram, or TEE (TOE in the United Kingdom, reflecting the spelling transoesophageal), is an alternative way to perform an echocardiogram. A specialized probe containing an ultrasound transducer at its tip is passed into the patient's esophagus.
Doctors may use TEE to prepare for a patient's surgery and identify possible risks. For example, they may use TEE to look for possible sources of blood clots in the heart or aorta. Blood clots can cause a stroke during surgery. TEE might be used in the operating room after a patient receives medicine to make him or her sleep during the surgery. The test can show the heart's structure and function and help guide the surgery. TEE also helps doctors assess a patient's status during surgery. For example, TEE can help check for blood flow and blood pressure problems. At the end of surgery, TEE might be used again to check how well the surgery worked. For example, TEE can show whether heart valves are working well. TEE also can show how well the heart is pumping.