HOAG ECG Exam | Complete Study Guide with
Questions and Verified Answers | 100% Correct |
Grade A+
• Cardiac Conduction: Interrupted or Altered. Answer: The electrical
pathway may become interrupted or altered depending on a patient's
acute or chronic condition. If the SA node is damaged or impaired, the
AV node will initiate an electrical impulse at a rate of 40-60 beats per
minute. If the AV node is damaged or impaired, the purkinje fibers will
initiate an electrical impulse at a rate of 20-40 beats per minute.
• Blood Flow Through the Heart. Answer: 1) The inferior and superior
vena cava returns deoxygenated blood from the body to the right atrium
2) The right atrium delivers deoxygenated blood to the right ventricle
through the tricuspid valve
3) The right ventricle pumps the deoxygenated blood through the
pulmonic valve to the pulmonary arteries. The lungs provide oxygen and
"oxygenate" the blood.
4) Oxygenated blood flows through the pulmonary veins to the left
atrium.
5) The left atrium delivers blood to the left ventricle through the mitral
valve.
6) The left ventricle pumps oxygenated blood through the aortic valve
where it is distributed throughout the body.
• Electricity and Blood Flow. Answer: 1) Electrical activity, atrial
contractions and ventricular contractions are interconnected
, 2) If the electrical pathway is altered or impaired (i.e. atrial fibrillation,
ventricular tachycardia), the blood flow pathway is also affected.
• P wave. Answer: The P wave represents atrial contraction or
depolarization
• QRS Wave/Complex. Answer: The QRS wave/complex represents
ventricular contraction or depolarization
• Q wave. Answer: The Q wave is the first negative deflection after the P
wave
• R Wave. Answer: The R wave is the first positive deflection after the P
wave
• S wave. Answer: The S wave is the first negative deflection after the R
wave
• Normal QRS Interval. Answer: The normal QRS interval is 0.04 - 0.12
seconds
• T wave. Answer: The T wave represents ventricular relaxation or
repolarization
• PR Interval: Measurement. Answer: The PR interval is measured from
the beginning of the P wave to the beginning of the QRS complex
Questions and Verified Answers | 100% Correct |
Grade A+
• Cardiac Conduction: Interrupted or Altered. Answer: The electrical
pathway may become interrupted or altered depending on a patient's
acute or chronic condition. If the SA node is damaged or impaired, the
AV node will initiate an electrical impulse at a rate of 40-60 beats per
minute. If the AV node is damaged or impaired, the purkinje fibers will
initiate an electrical impulse at a rate of 20-40 beats per minute.
• Blood Flow Through the Heart. Answer: 1) The inferior and superior
vena cava returns deoxygenated blood from the body to the right atrium
2) The right atrium delivers deoxygenated blood to the right ventricle
through the tricuspid valve
3) The right ventricle pumps the deoxygenated blood through the
pulmonic valve to the pulmonary arteries. The lungs provide oxygen and
"oxygenate" the blood.
4) Oxygenated blood flows through the pulmonary veins to the left
atrium.
5) The left atrium delivers blood to the left ventricle through the mitral
valve.
6) The left ventricle pumps oxygenated blood through the aortic valve
where it is distributed throughout the body.
• Electricity and Blood Flow. Answer: 1) Electrical activity, atrial
contractions and ventricular contractions are interconnected
, 2) If the electrical pathway is altered or impaired (i.e. atrial fibrillation,
ventricular tachycardia), the blood flow pathway is also affected.
• P wave. Answer: The P wave represents atrial contraction or
depolarization
• QRS Wave/Complex. Answer: The QRS wave/complex represents
ventricular contraction or depolarization
• Q wave. Answer: The Q wave is the first negative deflection after the P
wave
• R Wave. Answer: The R wave is the first positive deflection after the P
wave
• S wave. Answer: The S wave is the first negative deflection after the R
wave
• Normal QRS Interval. Answer: The normal QRS interval is 0.04 - 0.12
seconds
• T wave. Answer: The T wave represents ventricular relaxation or
repolarization
• PR Interval: Measurement. Answer: The PR interval is measured from
the beginning of the P wave to the beginning of the QRS complex
