Inclusion Criteria:  Male and female patients 18 years old or older Ability to sit for an ECG and AliveCor Kardia 12L and Kardia 6L recordings for 20 minutes  Exclusion Criteria:  Any internal stimulator that would generate electrical interference with the recording system of the AliveCor Kardia 12L or Kardia 6L. Open chest wounds or recent (<30 days) surgery to the chest or abdomen. Absence of any limb that would require modification of the lead set-up