Hemodynamic Measurements Flashcards
What does Cardiac Output Measure?
Volume of blood
Ejected from our heart
Per MINUTE
Liters/min
What does Cardiac Index Measure?
A
Liters/min
What does MAP Measure?
A
What does SVR/SVRI Measure?
A
What does Ejection Fraction (EF) Measure?
A
What does Stroke Volume (SV) Measure?
Volume of blood Ejected
From the heart Per Beat
SV = EDV - ESV in ml/beat
SV = End Diastole Vol - End Systolic Volume
Stroker Volume is influence by
Preload, Contractility, & Afterload
2 Hemodynamic Measurements that effect
PRELOAD
CVP: Central Venous Pressure
Right Ventricular
PAOP: Pulm Artery Occulsive Pressure
Left Ventricular
2 Hemodynamic Measurements that effect
AFTERLOAD
PVR: Pulmonary Vascukar Resistance
Right Ventricular
SVR: Systemic Vascular Resistance
Left Ventricular
What increases Preload
Fluids, Blood, FVO
What Decreases Preload
FVD, Bleeding
Nitrates, Morphine, BBs
What increases Afterload
HTN, HF, Aortic Valve Stenosis
Cardiogenic Shock, Hypovolemic Shock,
Cardiac Tamponade, Bleeding
Vasoconstrictors
What Decreases Aftetload
Distributive Shock (Warm Septic Shock, Anaphylaxis Shock, Neuro Shock,
Vasoplegic Shock s/p CABG
Vasodilators: Nitrates, CCBs, BBs
What increases Conractility
+ Inotropes: Dob, Dig, Epinephrine, Milrinone, Sepsis, SNS stimulation, etc
What Decreases Contractility
A. Problems: MIs, HF, high resistance,
High CO2 & H+, low O2, Electrolyte imbalance
B. Medications:
–> - Inotropes:
How is Cardiac Output CO
Calculated?
HR x SV (PL, AL, C)
Preload, Afterload, Contractility
What is Preload
(CVP, PAOP)
Myocardial Fiber Strength
What is Afterload
SVR
Resistance the ventricles have to overcome to eject blood
- right side - PVR
- left Side - SVR
What is Afterload
SVR
Resistance the heart has to eject against
in the systemic vasculature
What is Contractility
How Many Myocardial Muscle Fibers are Available to Contract
BP = CO x Resistance
What Decreases BP
Low CO —> Low BP
Vasoplegic/♡Shock, HTN, Vasoconstrictors
Low SVR —> Low BP
Distributive Shocks, Vasodilators
