# What is the normal running speed of the EKG paper?

## What is the normal running speed of the EKG paper?

The standard paper speed is 25mm/sec: 1mm (small square) = 0.04 sec (40ms) 5mm (large square) = 0.2 sec (200ms)

### What is the default gain or sensitivity on ECG?

The standard gain setting used when recording a 12-lead ECG is 10 mm = 1 mV. This setting must be used when the amplitude of ECG components, such as R wave height and ST segment deviation, are measured manually (parameters calculated automatically take the gain setting into account).

#### What is the sensitivity of an EKG for acute inferior MI?

An ST-segment elevation of at least 1mm in lead V4R in patients with acute inferior MI has a sensitivity of 100 percent, a specificity of 87 percent, and a predictive accuracy of 92 percent for the diagnosis of right ventricular infarction (fig. 94-8 ).

What should the heart rate be on an EKG?

Basic EKG interpretation 1. Heart rate: The standard paper speed is 25 mm (5 large squares)/sec. This means that if the interval between two beats (R-R) is 5 large squares, the HR is 60 beat/min.

What is the standard calibration for an ECG?

ECG Calibration meets this requirement. Standard calibration of the ECG is 10mm/mV. At this calibration, 1 miliVolt calibration signal is expected to produce a rectangle of 10 mm height and 5 mm width.

## What are the criteria for sinus rhythm EKG?

Sinus rhythm requires ALL of the following 3 criteria: 1 One P wave preceding each QRS complex 2 All P waves should be uniform in shape 3 Normal P wave axis is in the left lower quadrant (0-90 degrees), i.e. upright in both lead I and aVF (unless there is dextrocardia)

Basic EKG interpretation 1. Heart rate: The standard paper speed is 25 mm (5 large squares)/sec. This means that if the interval between two beats (R-R) is 5 large squares, the HR is 60 beat/min.

### What to look for before reading an EKG?

Before you read the EKG, look for: 1 Patient age: as many values change with age 2 Standardization: full standard is two large squares (1 mV, 10 mm) and half standard is one large square (0.5mV, 5 mm) 3 Paper speed: the standard is 25 mm/sec, the faster the paper speed the slower the HR will look and vice versa

#### What are the characteristics of a normal ECG?

The Normal ECG. The normal ECG will display these characteristics: Rhythm <10% variation in RR intervals) Rate 60- 99bpm. Cardiac Axis -30° – 90°. P Waves 0.2-0.3mV. 0.06 – 0.12s Upright in I, II, aVF, V2- V6. Inverted in aVR.

Sinus rhythm requires ALL of the following 3 criteria: 1 One P wave preceding each QRS complex 2 All P waves should be uniform in shape 3 Normal P wave axis is in the left lower quadrant (0-90 degrees), i.e. upright in both lead I and aVF (unless there is dextrocardia)