In DNA<span>, the code letters are A, T, G, and C, which stand </span>for<span> the chemicals </span>adenine<span>, thymine, guanine, and cytosine, respectively. In base pairing, </span>adenine always pairs<span> with thymine, and guanine </span>always pairs<span> with cytosine.</span>
An electronic cardiac monitor is the preferred method for assessing heart rate during chest compressions. While a person is performing chest compressions on a patient, he or she is hooked up to the electronic cardiac monitor so that the doctor can see exactly how fast the patient's heart is pumping blood. Cardiac monitoring is the best method do assess this.
