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CVT Cath Hemodynamics
CVT Cath Hemodynamics
38
Medical
Professional
11/13/2012

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Term
Posture – CO decreases approx. ____ when rising from supine position to sitting (fowlers) position
Definition
10%
Term
Factors that influence Cardiac Output
Definition
•Body Size •Age •Posture – CO decreases approx. 10% when rising from supine position to sitting (fowlers) position. •Body Temperature – CO will generally increase secondary to increased chronotropic state. •The function of cardiac output is to supply oxygen and nutrients to the body tissue. •Anxiety •Environmental Heat And Humidity
Term
Cardiac Output formula
Definition
CO = VO2/A-VdO2
Term
A-VdO2
Definition
Arteriovenous Difference
Term
VO2
Definition
Oxygen Consumption
Term
BSA Formula
Definition
Wt(Kg)^.425 x Ht(cm)^.725 x .007184
Units are Meters squared
Term
V02 =
Definition
250 or 125xBSA
Term
A-VdO2 formula
Definition
A-VdO2 = CaO2 - CvO2
Term
CaO2 formula
Definition
CaO2 = (Hgb x 1.36 x SaO2) + (.0031 x PaO2)
Unit is Vol %
Term
CvO2 formula
Definition
CvO2 = (Hgb x 1.36 x SvO2) + (.0031 x PvO2)
Unit is Vol %
Term
CO formula (A-VdO2)
Definition
CO = VO2 / (A-VdO2 x 10)
Term
PAO2 formula
Definition
PAO2 = (PB - 47) x FiO2 - (PaCO2 / RQ)
Term
Cardiac Index Normal Value
Definition
2.5 - 4 L/min/M^2
Term
Thermodilution technique advantages
Definition
More rapidly performed, requires one person/catheter, no blood needed
Term
Thermodilution technique disadvantages
Definition
Wires may pose shock hazzard, not accurate in presence of shunts
Term
Fick cardiac output technique advantages
Definition
More accurate in low output states
Term
Fick cardiac output technique disadvantages
Definition
Requires patient to be at a steady state
Term
Shunt
Definition
A passage between two blood vessels or between two sides of the heart as in cases where an opening exists in the wall which normally separates them, allowing for passage of blood
Term
Eisenmenger's complex
Definition
a condition where a left-to-right shunt has gradually changed to a right-to-left shunt secondary to pulmonary hypertension.
Term
Qualitative intracardiac shunt determination
Definition
determines the presence of a shunt
Term
Quantitative intracardiac shunt determination
Definition
determines the presence and “size” of the shunt
Term
Pulmonary blood flow
Definition
measurement of how much blood is flowing through the pulmonary vasculature
Term
Systemic blood flow
Definition
measurement of how much blood is flowing through the systemic vasculature
Term
What is the normal value for cardiac output returning to the LV without entering the pulmonary vasculature
Definition
2-5%
Term
Silent unit
Definition
no ventilation or perfusion
Term
Shunt unit
Definition
no ventilation, normal perfusion, also called a capillary shunt
Term
deadspace unit
Definition
normal ventilation, poor perfusion, also called venous admixture or shunt effect
Term
normal unit
Definition
equal ventilation and perfusion
Term
a way to calculate the amount of blood being shunted from the absolute shunt (anatomic + capillary) and the shunt effect (venous admixture).
Definition
the physiologic shunt equation
Term
Intrapulmonary shunting guidlines for interpretation < 10%
Definition
is compatible with normal lungs
Term
Intrapulmonary shunting guidlines for interpretation 10 - 19%
Definition
is abnormal but not of clinical significance
Term
Intrapulmonary shunting guidlines for interpretation 20 - 29%
Definition
is clinically significant and may be life threatening
Term
Intrapulmonary shunting guidlines for interpretation >30%
Definition
is potentially life threatening
Term
Right-to-left shunt most commonly caused by what?
Definition
VSD
Term
Indications for shunt studies
Definition
•Hemodynamic evaluation of patient's with congenital heart diseases.
•Unexplained desaturation (less than 95%)
–Suspect right-to-left shunt
–First rule out hypoventilation
–Other causes
–Corrective measures
•Administer O2
–If corrective measures don't help assume a right-left-shunt is present
Term
If the RA exceeds the IVC/SVC by 7% (Mean SAT) or 11% (Highest SAT)
Definition
ASD
Term
If the RV exceeds the RA by 5% (Mean SAT) or 10% (Highest SAT)
Definition
VSD
Term
If the PA exceeds the RV by 5% (Mean SAT) or 5% (Highest SAT)
Definition
Great Vessel (PDA)
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