I performed this ECG earlier this year in an outpatient clinic.
Patient's clinical data: 85-year-old white man; asymptomatic.
Questions? (1.) What rhythm is this tracing showing? (2.) What clue/sign is used to differentiate between the two anomalous beats (i.e., 4th and 6th beats). HINT: It's named after a part of a certain animal's anatomy.