Electrocardiography Ch 49 Review

Polarity as it relates to the cardiac cycle refers to:

• the electrical charge differences across the cardiac cell membrane during different phases of the cycle.

• the amount of blood pumped by the heart in one minute.

• the physical contraction of the heart muscle.

• the rate at which the heart beats.

Wave patterns on an ECG represent:

• The electrical activity of the heart

• The blood pressure in the arteries

• The oxygen level in the blood

• The heart's physical movement

Methods for calculating a heart rate using an ECG include:

• Counting the number of QRS complexes in a set time interval

• Measuring the height of the P wave

• Estimating based on patient age

• Using the color of the ECG paper

The components of an ECG machine include:

• Electrodes, amplifier, display, and recorder

• Stethoscope, thermometer, and sphygmomanometer

• Syringe, needle, and cotton swab

• Otoscope, ophthalmoscope, and reflex hammer

Identify the location for proper lead placement in an ECG.

• Chest and limbs

• Abdomen and back

• Neck and forehead

• Legs and arms only

Preparations that must be made before ECG testing include:

• Ensuring the skin is clean and dry at electrode sites

• Eating a heavy meal immediately before the test

• Applying lotion to the chest area

• Wearing metal jewelry during the test

Correcting various artifacts that occur during ECG testing involves which of the following actions?

• Checking electrode placement and ensuring proper skin preparation

• Increasing the paper speed to reduce artifacts

• Ignoring minor artifacts as they do not affect results

• Using any type of gel regardless of compatibility

A normal ECG would appear as:

• a regular pattern with P wave, QRS complex, and T wave

• an irregular pattern with no distinct waves

• a flat line with occasional spikes

• continuous high amplitude waves

Abnormalities commonly revealed through ECG testing include:

• Arrhythmias, myocardial infarction, and heart block

• Diabetes, hypertension, and asthma

• Arthritis, osteoporosis, and gout

• Anemia, leukemia, and lymphoma

The importance of exercise tolerance testing is:

• to assess the heart's response to physical stress

• to measure lung capacity only

• to diagnose diabetes directly

• to determine vision problems

Tags

NGSS.HS-LS1-7