# Which is the correct way to interpret an EKG?

August 3, 2019 Off By idswater

## Which is the correct way to interpret 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. The HR may be counted by simply dividing 300 by the number of the large squares between two heart beats (R-R). If the interval between two beats is

## How are EKGs used to diagnose heart problems?

EKGs can be used to diagnose heart attacks, heart problems including electrical malfunctioning and other heart problems. They are often used to diagnose heart problems in combination with an echocardiogram, or echo. How do you know when you need to act immediately or can wait for expert consultation?

## Where does the deflection of the EKG come from?

leads and their geometry. The EKG waveform comes from a measurement of surface voltages between 2 leads. A wave that is travelling towards the positive (+) lead will inscribe an upwards deflection of the EKG; conversely a wave traveling away from the positive lead will inscribe a downward deflection.

## How is the heart rate calculated 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. The HR may be counted by simply dividing 300 by the number of the large squares between two heart beats (R-R).

## How is the P-R interval of an EKG determined?

It is 0.5 to 2.5 mm high and 0.10 second or less wide. An abnormal P wave may be positive, negative, or flat (isoelectric). The P-R interval is determined by measuring the distance in seconds between the onset of the P wave and the onset of the first wave of the QRS complex, be it a Q, R, or S wave.

## What causes an inverted P wave on an EKG?

An inverted P wave may be seen following the QRS due to retrograde conduction. Characterized by wide QRS complexes that are not preceded by P waves. If the sinus node fails to initiate the impulse, an atrial focus will take over as the pacemaker, which is usually slower than the NSR. When the atrial focus fails, the AV node will take over.

## Where are the RA and La leads placed on an EKG?

The RA and LA leads may be placed on the right and left upper chest near the shoulders and the limb leads on the right and left abdomen at about the level of waist, below the rib cage. This placement is especially used if the EKG is to be done with exercise.