Sinus tachycardia is differentiated from a normal sinus rhythm by the: A. irregular heart rate. B. consistency of the P-R intervals. C. width of the QRS complexes. D. shape of the P waves. {Ans: A. irregular heart rate.}You arrive at the scene of an apparent death. When evaluating the patient, which of the following is a definitive sign of death? A. profound cyanosis B. absent breath sounds C. absence of a pulse D. dependent lividity {Ans: D. dependent lividity}You are ventilating an apneic woman with a bag-mask device. She has dentures, which are tight-fitting. Adequate chest rise is present with each ventilation, and the patient's oxygen saturation reads 96%. When you reassess the patency of her airway, you note that her dentures are now loose, although your ventilations are still producing adequate chest rise. You should: A. remove her dentures at once and increase the rate and volume of your ventilations. B. leave her dentures in place, but carefully monitor her for an airway obstruction. C. remove her dentures, resume ventilations, and assess for adequate chest rise. D. attempt to replace her dentures so that they fit tightly and resume ventilations. {Ans: C. remove her dentures, resume