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N450 Hemodynamic-Questions with Correct Answers/Verified/ Latest Update 2024/2025

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Three components of hemodynamic monitoring -️️pressure, flow, and oxygenation Three different functions the heart does -️️It's a pump, it's an organ, and it has its own electrophysiological component Electrophysiological pathway of the heart -️️SA node, internodal pathways, AV node, ...

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  • August 2, 2024
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MikeHarris
N450 Hemodynamic-Questions with Correct Answers/Verified/ Latest
Update 2024/2025
Three components of hemodynamic monitoring - ✔️✔️pressure, flow, and oxygenation



Three different functions the heart does - ✔️✔️It's a pump, it's an organ, and it has its own
electrophysiological component



Electrophysiological pathway of the heart - ✔️✔️SA node, internodal pathways, AV node, Bundle of
HIS, L&R bundle branches, purkinjie fibers



Depolarization - ✔️✔️Contraction.

(The process during the action potential when sodium is rushing into the cell causing the interior to
become more positive.)



Repolarization - ✔️✔️Resting.

Return of the cell to resting state, caused by reentry of potassium into the cell while sodium exits the
cell.



AV valves - ✔️✔️Tricuspid & Bicuspid (or mitral) (tri before you bi)



Semi-lunar valves - ✔️✔️pulmonary and aortic



S1 - ✔️✔️Closing of AV valves, beginning of systole. Louder and longer than S2 (Lub)



S2 - ✔️✔️AV valves are open. End of systole, beginning of diastole (Dub)



SA Node heart rate - ✔️✔️60-100 bpm



AV node heart rate - ✔️✔️40-60 bpm



Purkinjie fibers heart rate - ✔️✔️20-40 bpm

, P wave represents - ✔️✔️atrial depolarization (contraction).

Should be upright. 0.06-0.12 seconds.



Variation: Disturbance in conduction w/in atria.



QRS complex - ✔️✔️<0.03 seconds

ventricular depolarization. Represents time taken for depolarization of both ventricles.



MI may result in development of Q wave wider than or equal to >0.03 seconds



T wave represents - ✔️✔️ventricular repolarization (relaxation). Should be upright & well rounded.
Less than half the height of the QRS complex.



Disturbances caused by electrolyte imbalance, ischemia, or infarction.



PR interval time - ✔️✔️0.12-0.20 seconds. Measure from beginning of P wave to beginning of QRS.



variation: Disturbance in conduction usually in AV node, bundle of His, or bundle branches. Can be
atria as well.



QRS interval time - ✔️✔️0.06-0.12 seconds



pulse pressure - ✔️✔️difference between systolic and diastolic pressure (normally about 1/3 of
SBP)



increased? exercise or atherosclerosis of larger arteries.

decreased? heart failure or hypovolemia



Mean Arterial Pressure (MAP) - ✔️✔️The average pressure within the arterial system felt by the
organs in the body



MAP calculation - ✔️✔️(SBP + 2DBP)/3

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