# All Cardiology-calculators Formulas List

## QT Correction - Heart Electrical Cycle Interval

#### Formula:

(QT corrected =QT (sec) / sqrt(R-R Interval )

## Mean Arterial Pressure (MAP)

#### Formulas Used:

MAP = (CO x SVR) + CVP

## TIMI Risk Index

#### Formula:

TIMI Risk Index = heart rate x (age / 10)2 / systolic BP

## Pulmonary Vascular Resistance (PVR)

#### Formula:

Pulmonary Vascular Resistance(dyne*sec/cm5) = ( 80 * (PAP - PCW) / C.O )

Where,

PAP = Mean Pulm Art Press
PCW = Pulm Cap Wedge Press
C.O = Cardiac Output

## Fick Cardiac Output

#### Formula:

Cardiac Output (Fick) in L/min = (predicted O2/min/M2*BSA)/(13*Hgb*(SaO2-SvO2))

Where,

predicted O2 = 135 or 125 or 132.85

## Corrected QT Interval (QTc) - Bazett Equation

#### Formula :

QTc = QTm / √(RR)
RR = 60 / HR

Where,
QTc = Corrected QT
QTm = QT Measured
RR = RR Interval
HR = Heart Rate

## Right Ventricular Stroke Work Index (rvswi)

#### Formula:

R = ((P - C) × S × 0.0136) / h

Where,

R = Right ventricular stroke work index(RVSWI )
P = Mean Pulmonary artery systolic pressure
C = Central venous pressure
S = Cardiac Index
H = Heart Rate

## Aortic Valve Area

#### Formula:

Aortic Valve Area = LVOT diameter2 * 0.78540 * LVOT VTI / Aortic Valve VTI
CSA = ( LVOT ) cm2 = 0.785 x LVOT Diameter
SV = 0.785 x Diameter2 x VTI ( LVOT )

Where,

LVOT = Left Verticular Outflow Tract
VTI = Velocity Time Integral
CSA = Cross Sectional Area
SV = Stroke Volume

## Right Ventricular Contractility

#### Formula:

R = (12 / T) × 1000

Where,

R = Contractility Result
T = Isovolumic Contraction (Interval between mitral valve closure and aortic valve opening)

## Left Ventricular Stroke Work Index (LVSWI)

#### Formula:

BSA = 0.007184 × W0.425 × H0.725
L = ((S - P) × V × 0.0136) / BSA

Where,

L = Left ventricular stroke work index (LVSWI )
P = Pulmonary artery occlusion pressure
S = Mean Arterial Pressure
V = Stroke volume
W = Patient weight(kg)
H = Patient height(cm)

## Left Ventricular Contractility

#### Formula:

L = (32 / T) × 1000

Where,

L = Contractility Result
T = Isovolumic Contraction(Interval between mitral valve closure and aortic valve opening)

#### Formula:

a = (FiO2 / 100) × (Patm - PH2O) - PaCO2 / r - PaO2
e = (g / 4) + 4

Where,

FiO2 = Fraction of Inspired Oxygen
Patm = Atmospheric Pressure
PH2O = Water Vapor Pressure
PaCO2 = Partial Pressure of Arterial CO2
r = Respiratory Quotient (RQ)
PaO2 = Partial Pressure of Arterial O2
g = Patients Age

## Cardiac Stroke Volume Index Calculation

#### Formula:

Stroke Volume Index = Cardiac Index / Heart Rate

## Stroke Volume Index

#### Formula:

Stroke Volume Index = Stroke Volume in mL/ Body Surface Area in m2

## Ventricular Contractility Assessment

#### Formula:

R = (12 / T) × 1000
L = (32 / T) × 1000

Where,

R = Contractility Result of Left Ventricle
L = Contractility Result of Right Ventricle
T = Isovolumic Contraction (Interval between mitral valve closure and aortic valve opening)

## Pulmonary Capillary Wedge Pressure (PCWP)

#### Formula:

e' = (l + s) / 2
p = 1.24 x (E / e') + 1.9

Where,

e' = Average of the Lateral and Septal e Values
l = Early Diastolic Velocity of Lateral Mitral Annulus
s = Early Diastolic Velocity of Medial Mitral Annulus
E = Mitral Inflow E Velocity
p = Mean Pulmonary Capillary Wedge Pressure