Hemodynamics Flashcards
(23 cards)
Stroke volume
50-100 ml/beat
Stroke index
25-45 ml/m2
Cardiac output
4-8 L/min
Cardiac index
2.5-4 L/min/m2
Ejection fraction
> 60%
Wedge pressure (PCWP or PAOP)
8-12 mmHg
Central venous pressure (CVP)
2-6 mmHg
…RV dysfunction
Pulmonary artery pressure
> …
25/10
> 35/20 pulmonary HTN
SvO2
Mixed venous oxyhemoglobin
60-75%
SvO2 is obtained from which catheter?
Mixed venous oxyhemoglobin is obtained from the pulmonary catheter, the distal port, and slowly so you don’t get an arterial like sample.
SvO2 is…
…the amount of oxygen still in hemoglobin when it returns to the lungs.
…normally 25% of o2 in hemoglobin is extracted
…falls when oxygen delivery falls, PO2 falls, oxygen demand and consumption increases
Lactate
…another indicator of tissue oxygenation
1-2 mmol
High: metabolic acidosis, anaerobic metabolism
LVEDV
Left ventricular end diastolic volume
Ex LV dysfunction ..pt maintains stroke volume by increasing LVEDV ..by EF drops
Stroke volume falls with … (2)
- Hypovolemia
2. LV dysfunction : left ventricle becomes too weak
Preload
Amount of stretch in myocardial muscle before it contracts..
Estimated by the PAOP for LV and the CVP for RV assessment
Starlings law
More stretch = more contraction
But too much stretch = weak contraction
PAOP …
18…LV dysfunction /failure
Interpret along with low or high stroke index
ST develops because of…(3)
- Increase in metabolic rate like fever
- Anxiety or fear
- Reduction in stroke volume
A. Hypovolemia
B. LV dysfunction
Mvo2
Myocardial oxygen consumption
After load
Resistance a muscle faces as it tries to contract
Estimated by the SVR for LV resistance and the PVR for RV resistance
Contractility
Strength of the muscle contraction
Estimated by the SV, PAOP, or CVP
MAP
Mean arterial pressure
70-110 mmHg
CVP is also a measure of…
RVEDP
