Exam (elaborations)
NUR 172 Cardiac: Questions & Accurate Answers
NUR 172 Cardiac: Questions & Accurate Answers
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NUR 172 Cardiac: Questions & Accurate AnswersWhat are the locations on the chest when listening to heart sounds? Right
Ans - - Aortic
- Pulmonic
- Erb's point
- Tricuspid
- Mitral
What is the flow of blood through the heart? Right Ans - - Deoxygenated
Blood flows into the heart
> Inferior Vena Cava (IVC) & Superior Vena Cava (SVC)
> Right Atrium > Tricupsid Valve > Right Ventricle
> Pulmonary Valve > Pulmonary Arteries (R&L) > Lungs
> Pulmonary Veins > Left Atrium > Mitral Valve
> Left Ventricle > Aortic Valve > Aorta > Body
What is the normal electrical conduction of the heart? Right Ans - - SA node
(sinoATRIAL) = 60-100 bpm
- AV node (atrioVENTRICULAR) = 40-60 bpm
- Bundle of His (AV bundle)
- Purkinje fibers = 20-40bpm
Where do you place ECG leads? Right Ans - - White on Right, Black on Left
- Smoke (Black) over Fire (Red)
- Snow (White) on top of Grass (Green)
- Heart loves Chocolate (Brown)
- White/Black (2nd intercostal space, mid clavicular line)
- Green/Red (6th/7th intercostal space, mid clavicle)
- Brown (Right of sternum, 4th intercostal space)
What is measured in seconds on a telemetry strip and what are normal
ranges? Right Ans - - PR interval (0.12-0.2 seconds)
- QRS interval (0.06-0.1 seconds)
- QT interval (0.34-0.43 seconds)
When looking at a telemetry strip, how many seconds do the boxes measure?
Right Ans - - Small box = 0.04 seconds
, - 5 Small boxes = 0.2 seconds => 1 Large box
- 5 Large boxes = 1 second
In regards to the Heart muscle, what does depolarization and re-polarization
cause? Right Ans - - Depolarization = contraction
- Re-polarization = relaxation
What does the P wave represent? Right Ans - Firing of the SA node and
atrial depolarization
What does the PR interval represent? Right Ans - - Atrial Depolarization
and AV Delay
- AV Delay = The time required for the impulse to travel from the atria
through the AV node (0.12-0.2 seconds)
- Measured from beginning of the P wave to the beginning of the QRS Complex
What does the QRS complex represent? Right Ans - - Ventricular
depolarization
- QRS Interval: 0.06 - 0.1 seconds
What does the T wave represent? Right Ans - - Ventricular re-polarization
- The ventricles are resting causing them to fill w/ blood
What does the QT interval represent? Right Ans - - Time it takes for
ventricular depolarization and re-polarization to occur
- QT Interval: 0.34 - 0.43 seconds
Sinus bradycardia is less than _____bpm Right Ans - 60
Sinus tachycardia is _____-_____bpm Right Ans - 100-160 (HR > 100)
What is the antidote for sinus bradycardia? Right Ans - Atropine = an
anitcholinergic that can elevate the HR back to normal
What can be the cause of sinus tachycardia? Right Ans - - Sympathetic NS
stimulation is the #1 cause (fear, anxiety, exercise, excitement, pain, fever,
bleeding, dehydration, HF, hyper-thyroid)
- Low blood volume
- Adrenergic agonists (Albuterol)
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