To search the PhysioBank Index, enter simple queries of the form:
        [MODIFIER] SUBJECT OP PATTERN

where [MODIFIER] is # (count of matches only), + (long form), or may be omitted
      SUBJECT specifies a category of data in the PhysioBank Index
      OP is one of  < <= = >= > ~ !~ !=
      PATTERN is compared with the elements of SUBJECT

SUBJECT may be a quoted signal name ("aVF"), @-prefixed annotator name (@atr),
or one of:
   Age Diag Info Med Record Sex  AnnM AnnR  BP CO CO2 ECG EEG EMG EOG EP
   Flow HR Noise O2 PLETH Pos Resp Sound ST Status Stim SV Temp

Append -N to a SUBJECT to find records including at least N instances of the
SUBJECT (e.g., ECG-3 finds records with 3 or more ECG signals).

Enter a query, or ? to view this help, HELP for more help, or EXIT to quit.