telemetry med surg exam 3 2022 with complete solutions.
2 views 0 purchase
Course
Telemetry med surg
Institution
Telemetry Med Surg
sinus node
The intrinsic pacemaker. Cell membrane "leakiness" causes spontaneous depolarization at a rate of 60-100 times a minute.
AV node
Acts like a resistor to slow the impulse allowing time for the atria to completely contract before initiating ventricular contraction. Back up pacemaker...
telemetry med surg exam 3 2022 with complete solutions
Written for
Telemetry med surg
All documents for this subject (7)
Seller
Follow
Greaterheights
Reviews received
Content preview
telemetry med surg exam 3
sinus node - AnswerThe intrinsic pacemaker. Cell membrane "leakiness" causes
spontaneous depolarization at a rate of 60-100 times a minute.
AV node - AnswerActs like a resistor to slow the impulse allowing time for the atria to
completely contract before initiating ventricular contraction. Back up pacemaker if SA
fails, pacing at a rate of 40-60 times a minute.
Bundle of his - Answer"Cable" that passes through the fibrous sheath separating atria
from ventricles. Divides into the bundle branches.
Bundle branches - Answer"Wires" that run down the septum and into the ventricles.
There are two left bundle branches and one right.
Purkinje - AnswerTerminal fibers branches from the bundles, distributing the impulse
throughout the ventricles.
Intranodal pathways - Answer"Wiring" that allows rapid impulse movement around the
atria to coordinate simultaneous atria contraction
Impulse vectors - AnswerSA node
Atria
AV node
The depolarization wave in the ventricles also travel in specific directions forming
vectors. Because the left ventricle has a bigger muscle mass, the wave of
depolarization (starts in mid septum) is greater than the right and is represented as a
bigger vector.
which ventricle has bigger muscle mass - Answerleft ventricle
degree of perpendicular - AnswerIf the current is running at an angle to the field, the
angulation is seen as so much positive and so much negative depending on how
parallel and perpendicular the current vector is to the field. The degree of perpendicular
can also be seen as a decrease in amplitude only.
leads - Answer
PQRST - Answer
P wave - AnswerATRIAL DEPOLARIZATION
Normal: small, round, positive in lead II
amplitude 0.5-2.5 mm, 0.10 seconds or less
p wave amplitude and time - Answer0.5-2.5 mm
, telemetry med surg exam 3
0.10 s
abnormally shaped P wave indicates - Answerdamaged atria (enlarged makes p wave
look like an "m") or an impulse origin outside of the SA node (ectopic)
notching in P wave indicates - Answeratrial enlargement (p mitrale)
PR interval normal length - Answer0.12-.20s
PR interval - AnswerStart: beginning of P
End: beginning of QRS
atrial depolarization and pause before QRS (AV node delay)
current traveling quickly down the His and purkinjes
shortened PRI - Answerbypass pathway or the impulse origin was ectopic and close to
the AV node
long PRI - Answerdelays at the AV or His
QRS complex normal length and characteristics - Answer0.06-0.12 s
BEGIN: first deflection
END: flattening before the t (j point)
The "classic" QRS complex is composed of three distinct waves: Q wave-the negative
deflection following the PRI. R wave-tall positively deflected wave in lead II. S wave-
negative deflection following the R wave.
abnormal QRS - Answerwide, longer than 0.12 s
QRS complex - AnswerDEPOLARIZATION OF VENTRICULAR MYOCARDIUM
can take many shapes
ST Segment - AnswerVENTRICULAR DEPOLARIZATION and BEGINNING OF
VENTRICULAR REPOLARIZATION
BEGIN: J point
END: start of t wave
should be flat and horizontally lined up with baseline of PRI
important for doing 12 lead EKG
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Greaterheights. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.99. You're not tied to anything after your purchase.
