Formulars and ideas Flashcards
fornulas and stuff
Calculate the RF% ( regurgitate fraction )
Given
LVMF is 6.6 Liters / min.
TD ( Thermodilution ) CO is
4.56 Liters / min.LVMF - CO from Fick or TD
Divided by LVMF
Step 1: 6.6 Lt - 4.56 Lt = 2.04 Lts
Step 2: 2.04/6.6 = .309
Step 3: .309 x 100 = 30.9%
Cardiac Index
Formula for CI is …
CI = CO / BSA
Cardiac output divided by the Body
Surface Area
Normal values = 2.5 - 4.0 l/min/meter
squared
What is BSA or Body Surface Area
BSA = the total suface area of the human body. The BSA is used in many measurments in medicine, including the calculation of drug dosages and the amount of fluids to be administered IV.
Angiographic Cardiac output or
LVMF ( left Ventricular minute flow)
What is the formula for LVMF?
LVMF
LV End Diastolic volume - LV End Systolic Volume x Heart Rate
LVEDV - LVEST x HR
Calculate the LVMF or Angiographic Cardiac output
Given: LVEDV = 140 ml LVESV = 40ml HR = 66 bpm
LVMF = LVEDV - LVESV x HR
Step1 : 140 ml - 40 ml = 100 ml
Step2: 100 ml x 66 bpm = 6600ml
answer : LVMF = 6600 mi / min
6.6 Liters / min
RF ( Regurgitation Fraction) Definition
The ratio of Regurg to the LV total flow. This is the most accurate form of cardiac output for patients with valvular regurg.
Calculate the Angiographic SV
Given:
* EDV = 140 ml
* ESV = 40 ml
Formula:
EDV - ESV
140 ml - 40 ml = 100 ml
What is the average SV in Adults?
70ml
range is 60 - 130 ml
Given:
CO 5 liters / min
Heart rate 80
Calculate the SV
Formula:
SV = CO in ml/hr
Step1 : change 5 liters to ml = 5000ml
Step2 : Divide by heart rate of 80
5000 / 80 = 62.5 or 63 ml/min.Stroke Volume SV =
SV = CO in ml’s
Divided by HR
Normal Range = 60 - 130 ml
What is the Formula for MAP ( Mean Arterial Pressure)
Systolic BP = ( 2 x Diastolic ) divided by 3.
The patient has a BP of 140 / 90
Calculate the MAP
STEP1 : 140 + 2 x 90 = 320
Step2 : 320 / 3 = 106.6
answer : 107 mm/hg
PVR
( Pulmonary Vascular Resistance)
Formula
(MEAN PA) - (Mean PCW)
divided by CO
Given: PA = 25/10/15 PCW = 9/6/6 CO = 6.8
(15-5)/6 = 1.3 HRU’s
(Hybrid or Wood Units)
1.3 x 80 = 104 dynes/sec/cm - 5 ARU’s
Pulse Pressure Formula
AO systolic - AO Diastolic
Given: BP = 120/80
120 - 80 = 40
40 mmHg
Calculate the Ejection Fraction
Given:
EDV 130
ESV 70
Formula:
SV (Stoke Volume)/ EDV
130 - 70/130 = .46
.46 or 46%
The dP/dT comes from detla P/delta T or change in pressure over time and is a good index of?
LV Contractility
What is the Average BSA for men and women?
Average BSA for adult men : 1.9 m2
Angiographic SV (STROKE VOLUME) Definition
The average blood being ejected from the LV during each Contraction. The Angiographic SV can be calucatedusing the formula:
SV = EDV - ESV
Average adult stroke volume is 70ml.
Normal O2 Consumption
Adult 250 ml/min
Child 150ml/min
Formula for ejection Fraction
Stroke Volume
divided by End Diastolic volume.
Ejectio Fraction Formula
Formula:
SV / EDV
Formula for Conversion of HRU’s
(Hybrid Resistance Units) to ARU’s
Adsolute Resistance Units
SVR = HRU's x 80 PVR = HRU's x 80
The formula for BP
CO x SVR
systemic vascular resistance
Normal Range for Adsolute Resistance Units (ARU's) for SVR and PVR.
SVR = 1130 + or - 178 PVR = 67 + or - 23
Given:
HR 90
SV 100 ml
Calculate the CO ( cardiac output)
CO = HR + SV
90 x 100 = 9000
CO = 9000 ml/min or 9 L/min
Formula for Angiographic SV ( Stroke Volume )
End diastolic volume minus the end systolic volume
EDV - ESV
CO (Cardiac Output) = ____ X_____
HR x SV
Normal is 4-8 liters per minute.
Formula for RF% ( regurg Fraction) using Cardiac Output.
Formula for Regurgitation Fraction
LVMF - CO from Fick or TD
divided by LVMF
Formula for Peak to Peak Gradiient?
LV systolic - AO systolic
Given:
LV 180 /0/18
AO 130 /70
180 - 130 = 50
Answer 50 mmHg gradiant
Normal Range for Absolute Resistance units (ARU’s) for SVR and PVR
SVR = 1130+ or -178 PVR = 67+ or -23
