The APM audio patient monitor is a compact, portable, battery powered, solid state electronic audio amplifier: having special characteristics for sensing the low frequency pressure pulses of the cardiovascular system and the sounds of respiration.

Heart/pulse and/or respiration sounds are picked up by a sensor unit from an esophageal stethoscope tube or chest piece cup, amplified and presented audibly from a speaker and visually by a flashing red indicator light. A "beeper" sound function is selected by a mode switch for increased audibility in heart monitoring.

• Compact: (4"x 6" x 3 1/2" -- l 1/2 lb.) facilitates placing the unit on an operating table or mounting to wall or to anesthesia machine with accessory brackets for unmatched convenience.
  
• Greater sensitivity: enabling use with chest piece cups at weaker signal sites, as well as with esophageal stethoscope tubes.
  
• Miniaturized sensor unit: suitable for direct connections to accessory sound sources with less clutter.
  
• Mode selector switch: for choosing best audibility characteristics for the type of monitoring desired.
  
• Pulselite: flashing red light indicator for visual heart/pulse monitoring.
  
• Metal case: seamless, deep-drawn, heavy aluminum case with carrying handle provides complete shielding from pick up of electrical interference from other equipment.