Ambulatory encoding monitor recorder optimized for rescalable encoding and method of use

A method for rescalable encoding on ambulatory monitor, comprising:

• maintaining in a memory of an ambulatory monitor a plurality of codes and an electrocardiographic value range associated with each of the codes, the monitor further comprising electrocardiographic electrodes configured to be positioned in a region of a sternal midline of a patient to facilitate sensing of P-waves, an electrocardiographic front end circuit that is operable to sense electrocardiographic signals comprising one or more of the P-waves through the electrocardiographic electrodes, and a micro-processor interfaced to the electrocardiographic front end;
• and
• obtaining by the micro-processor of the monitor based on the electrocardiographic signals electrocardiographic values during a sequence of temporal windows and processing by the micro-processor the electrocardiographic values associated with each of the windows, the processing comprising:
• performing a mathematical operation on two of the electrocardiographic values associated with each of the temporal windows;
• analyzing a result of each of the mathematical operations;
• based on the analysis for at least one of the windows, adjusting the electrocardiographic value range associated with each of the codes;
• encoding each of the electrocardiographic values within that window with one of the codes based on the adjusted electrocardiographic value range associated with that code, wherein the encoding with the adjusted electrocardiographic value ranges enhances detection of the one or more P-waves based on at least a portion of the electrocardiographic values associated with that window;
• and
• writing each of the codes into a sequence in the memory.