Jason is taking a break (everyone needs one now and then). April's ECG will appear through May, as well. It's a good one!
These are 3 simultaneous rhythm tracings that were once part of a full 12-lead ECG. Unfortunately, this ECG dates from a time period when our facility's computer database did not store complete 12-lead ECGs. The technology at the time was known as "reduced data", so much of the entire 12-lead ECG was deleted and only leads II, V1, and V5 were preserved for review by the cardiologist. This was in an attempt to reduce the amount of information that the computer would need to store over time. I can only imagine that this method was eventually deemed to be an undesirable way of storing ECG data. Later generations of computer storage would download the 12-lead ECG in its entirety.
All of that being said, what is this showing? Obviously, many things can not be determined without the remaining leads (e.g., QRS axis, chamber enlargement, etc) but the arrhythmic mechanism can still be determined.