ECG and Xrays

Question 1

PR interval normal?

Answer 1

0.12-20 seconds

Question 2

QRS how many small sqaures?

Answer 2

A width >3 small squares (at 25 mm/s ECG speed) is equivalent to 0.12 seconds, and this is the boundary between QRS complexes being narrow or broad

Question 3

LBBB

s waves in what leads?

Answer 3

LBBB (the “L”s in WiLLiaM) is reported by a broad S-wave (or deep Q- and S-waves) in the right-hand leads (forming a “W” in the QRS of V1–3, mainly V1) and a pair of R-waves in the left-hand leads (forming an “M” in the QRS of V4–6, mainly V6

Question 4

MS

Answer 4

Periventricular white matter lesions not necessarily matching the
clinical picture