1. 1. What should the nurse measure to determine whether there is a delay in impulse conduction through the patient's ventricles? a. P wave b. Q wave c. PR interval d. QRS complex Answer D The QRS complex represents ventricular depolarization.The P wave representsthe depolarization of the atria. The PR interval represents depolarization of the atria, atrioventricular node, bundle of His, bundle branches, and the Purkinje fibers.The Q wave is the first negative deflection following the P wave and should be narrow and short. 2. 2. The nurse needs to quickly estimate the heart rate for a patient with a regular heart rhythm.Which method will be fastest to use? a. Count the number of large squares in the R-R interval and divide by 300. b. Print a 1-minute electrocardiogram (ECG) strip and count the number of QRS complexes. c. Use the 3-second markers to count the number of QRS complexes in 6 seconds and multiply by 10. d. Calculate the number of small squares between one QRS complex and the next and divide into 1500.: Answer C Using the 3-second markers to count the number of QRS complexes in 6 seconds and multiplying by 10 is the quickest way to determine the ventricular rate for a patient with a regular rhythm.The other methods are accurate but take longer. 3. 3. A patient has a junctional escape rhythm on the monitor.What heart rate should the nurse expect the patient to have? a. 15 to 20 b. 20 to 40 c. 40 to 60 d. 60 to 100