April 16, 2018

Coupling Intervals and Return Cycles

Coupling intervals involve a native, normal deflection that is followed by a premature, ectopic deflection of the same type (i.e., from the same chamber). In other […]
March 30, 2018

Answer to Post from LinkedIN: What Do the Indicated Patterns Represent?

  There are three sets of lines - each in a different color. What do they represent? When an electrode becomes loose or experiences other problems, […]
March 13, 2018

RBBB Can Be Very Tricky!

My last post about RBBB drew a lot of attention so I decided to write another one. I Started to name it, "So You Think You […]
March 12, 2018

Answer to Rhythm Strip Posted on LinkedIN…

There are several issues here. First, those responding that the narrow QRS complex is a result of a pause occurring in a rate-dependent (or acceleration-dependent) bundle […]
March 8, 2018

“Rabbit Ears” and Right Bundle Branch Block

Back in the 1950's or perhaps early 1960's Dr. Henry Marriott - as the story goes - overheard a nurse state that a right bundle branch […]
March 5, 2018

Orientation of the Heart

March 3, 2018

Making Use of Lead V4R

You've just done a 12-lead ECG on a patient with chest pain compatible with an acute coronary syndrome. It shows ST elevation in leads II, III […]
March 3, 2018

Is the Pacemaker Wire Where It Should Be?

During one of my orientations as a young internal medicine house officer, the cardiologist lectured us on the essentials of how to check pacemakers. Since none […]
March 3, 2018

The PR Interval and AV Conduction Delay

We all know that the PR interval is prolonged in the presence of a 1st degree AV block, that the PR interval is short when ventricular […]