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Regurgitant Formulas

Cardiac Regurgitant Formulas for Cath Lab

QuestionAnswer
Forward Stroke Volume Formula Fick CO / HR
Fick CO divided by Heart Rate FSV mL
Total Stroke Volume End diastolic Volume MINUS End Systolic Volume = mL
TSV= EDV-ESV
Left Ventricular Minute Flow (LVMF) Total Stroke Volume X Heart Rate then move three steps back!
LVMF= TSV X HR then LEFT 3 SPACES L/min
Ejection Fraction % Total Stroke Volume DIVIDED BY End Diastolic Volume ***then 2 spaces to the right**
EF % = TSV / EDV **Move decimal 2 spaces to the right**
Regurgitant Volume (Flow) Total Stroke Volume - Forward Stroke Volume
Regurgitant Flow TSV-FSV
Regurgitant Fraction Regurgitant volume DIVIDED BY Total Stroke Volume
Regurgitant Ratio Regurgitant flow / TSV
TSV-FSV = REGURGITANT VOLUME (Flow)
Regurgitant volume / total stroke volume= Regurgitant Ratio
What kind of flow across the valves does regurgitation demonstrate? Bi-directional
What types of flow are seen across regurgitant valves? (FSV) Forward SV and (TSV) Total SV
What effect does regurgitation have on cardiac output and why? Increases, due to increase in volume with each beat
What effect does regurgitation have on the left ventricular minute flow (LVMF)? Will be larger than traditional CO
Should Fick CO or Thermodilution CO be used when determining regurgitation? Fick CO
What pressures do you check to determine MR? Elevated "v" wave in the PCWP
What pressures do you check to determine TR? Elevated "v" wave in the RA
What are the diastolic effects of MR? * LV diastolic volume overload and LV dilatation/hypertrophy. * * Decreased CO in AO * LA volume overload and atrial dilatation
What are the systolic effects of MR? * Initial increase in left "atrial kick" as well as LV SV and CO occur as a result of diastolic effects (early in chronic cases)
What are the systolic effects of severe MR? Decreased SV and CO and increased systemic afterload
What factors determine hemodynamic effects in MR? * Size of regurgitant orifice * LV Systolic Pressure *LA compliance (becomes rigid, cannot sustain volume overload *Degree of acuity (how acute is it?)
What are the causes of MR? * Abnormally shaped valve leaflets. * Anatomical defects in structures surrounding valve
What are the structures surrounding the MV and TV? * Chordae Tendonea * Papillary muscles * Valve annulus
What refers to the backward flow of blood from LV to LA during systole due to inadequate valve closure? Mitral Regurgitation
When does regurgitation show? When valves are closed
Mitral Regurgitation is a *(high or low)* cardiac output state low cardiac output ****MR is LOCO*****
What cardiac rhythm is most commonly associated with MR? A-fib
Acute mitral regurgitation causes... a sudden volume overload of both the left atrium and the left ventricle.
The combination of the forward stroke volume and the regurgitant volume is known as the total stroke volume of the left ventricle
Regurgitant volume causes a volume overload and a pressure overload of the LA
With Chronic MR, the left ventricle develops eccentric hypertrophy in order to better manage the larger than normal stroke volume (SV)
Created by: CVTMom