Paramedic Cardiology Questions and Answers Already Passed Updated 2023/2024
SA Node Rate 60-100 BPM AV Node Rate 40-60 BPM Bundle of His/Perkinjie Rate 40 BPM Flow of blood through the heart from the body superior and inferior vena cavas right atrium tricuspid valve right ventricle semilunar valve pulmonary artery lungs pulmonary veins left atrium bicuspid valve left ventricle semilunar valve aorta to the body Inotropic Beats Harder Chronotropic Beats Faster Dromotropic Improved contractility "P" Wave the P wave represents the electrical activity associated with the contraction of the atria, or atrial depolarization "P-R" Interval Time required for conduction from the SA node to AV node. The time between atrial and ventricular depolarization. This is normally 0.12 to 0.2 seconds. "Q" Wave The first portion of the QRS complex that is seen with a downward deflection and is usually not obvious on the EKG of the normal heart. Often the first portion of the deflection is positive, signifying no Q wave. This is the beginning of ventricular depolarization. "QRS" Complex Represents ventricle depolarization. The QRS Interval is measured from the start of the Q wave or from the beginning of the R wave if no Q wave is present. If no Q wave is present, a normal QRS interval should be less than 0.12 seconds in all leads.
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