ECG Basics 01

Question 1

How many seconds is the ECG strip of a standard ECG¿

Answer 1

10-second strip.

The bottom one or two lines will be a full “rhythm strip” of a specific lead, spanning the whole 10 seconds of the ECG.

Question 2

How many seconds are in the individual leads

Excluding lead II of course

Answer 2

About 2.5 seconds.

Question 3

Each ECG is divided by large boxes and small boxes to help measure times and distances.
A) Each small box is equivalent to how many seconds.

B) Each large box represents how many seconds¿

Answer 3

A) Each small box is equivalent to 0.04 seconds.

B) Each large box represents 0.20 seconds,
There are five small boxes in each large box

Question 4

A) If the entire ECG is 10 seconds, then how many 50 large boxes are there in the entire length of an ECG¿

B) If each small box is also exactly 1 mm in length; how many millimeters are there in one large box¿

Answer 4

A)There is 50 large boxes (0.20 seconds times 50 large boxes).

B) One large box is 5 mm.

Question 5

In general, when measuring amplitudes of waves or complexes, the units are expressed in mm, and when measuring lengths for intervals, the units are expressed in seconds or milliseconds (ms).

Answer 5

A) Amplitudes of waves or complexes, are expressed in:
mm

B) When measuring lengths for intervals, the units are expressed in:
seconds or milliseconds (ms).

Question 6

A) If each small box is equal to 0.04 seconds or 1 mm, then the standard ECG speed is
¿

Answer 6

A) The standard ECG speed is 1 mm per 0.04 seconds,

or 25 mm per second.