Day 3

Question 1

Once you read a LBBB, you cannot read _____________.

Answer 1

anything except in I and aVL – which means an anteroseptal MI, not a high-lateral

Question 2

Left atrial enlargement causes _________ of the P wave. Why?

Answer 2

lengthening

The right atrium contracts first because the SA node is in the right atrium. The left is slightly delayed, so enlargement draws out the P wave.

Question 3

Look for signs of left atrial abnormalities in lead ________.

Answer 3

V1 and II

• II: P lengthens
• V1: P is deeper and broader than 1 box by 1 box

Question 4

Innocent murmurs do not __________.

Answer 4

radiate to the neck

This is why it is important to listen for carotid radiation – it is the only distinguishing feature between an innocent murmur and mild aortic stenosis.

Question 5

Children commonly have ___________, which is given by increased venous return.

Answer 5

a cervical hum (vibrating sound heard over neck)

Question 6

A dialysis fistula sounds like what naturally occurring murmur?

Answer 6

PDA