Figure 34-11 The multipurpose pacing pulmonary artery catheter. Three atrial and two ventricular electrodes can be seen. (From Narang J, Thys DM: Electrocardiographic monitoring. In Ehrenwerth J, Eisenkraft JB [eds]: Anesthesia Equipment: Principles and Applications. St. Louis, Mosby-Year Book, 1992, p 284.)