Section II begins with the chapters “Sinus Node Dysfunction” and “Atrioventricular Block,” in which indications for pacing, selection of the best pacing mode (eg, AAI, VVI[R], or DDD[R]), and the pacemaker syndrome are discussed. The added value of rate-responsive pacing, an option now available in most pacing units, is reviewed. The editors discuss promising new pacemaker therapies in the next chapter, “New and Emerging Indications for Cardiac Pacing.” Pacing (possibly including biatrial pacing) is under investigation for stabilizing atrial fibrillation, may help some patients with hypertrophic obstructive cardiomyopathy, and may have a place in the treatment of advanced heart failure. Pacer therapy can be useful in treating reflex syncope, carotid sinus hypersensitivity, and vasovagal syncope. I especially liked the last chapter in this section, “Cardiac Pacing in the Critical Care Unit,” which is a superbly written treatise that includes pacemaker system complications and the diagnosis and treatment of malfunctions.