Arterial Lines Flashcards
Traducer converts pressure into
An electrical signal
Arterial wavefore can be reproduced by which analysis?
Fourier
What generates wave?
Systemic arterial pressure waveform results from ejection of blood from the LV into aorta during systole, followed by peripheral arterial runoff of this SV during diastole
Name parts of R Wave:
- Systolic upstroke
- Systolic peak pressure
- Systolic decline
- Dicrotic notch
- Diastolic runoff
- End-diastolic pressure
Indications:
- Tight control of BP
- Hemodynamic instability
- Response to vasoactive drugs
- Monitoring anesthetic technique
- Major fluid shifts or blood loss
- Need frequents ABGs
- Inability to obtain NIBP
Absolute Contraindacations:
- Localized infection at site
- Pre-exisitng ischemia or nerve damage
- Raynaud’s phenomenon
- Traumatic injury proximal to site
Relative contraindacations:
- Failure to demonstrate collateral flow
- AV fistula
- Presence of disrupted lymphatics
Where must artline be zeroed and placed?
At height of coronary sinus or level of EAC during intracranial surgery.
Location of artline placement:
Most common is radial but can be placed ulnar, brachial, axillary, femoral and dorsalis pedis.
As the distance from the heart increases:
The pulse pressure widens (systolic increases and diastolic decreases), waveform narrows
Transfixation Technique:
Basically like “thru and thru”; Catheter is placed completely thru artery, hook up to flush apparatus and retract until blood pulses freely into flush apparatus
If you move a transducer above the level of the heart the pressure will:
Decrease by 15mm Hg (20 cm H2O) per __.
Causes of Dampened waveforms:
- Arterial obstruction
- Catheter obstruction or clot
- Kinkin of pressure tubing
- loss of flush pressure
- Transducer fail
Complications:
- Distal ischemia
- Pseudoaneurysm
- Arterlovenous fistula
- Hemorrhage
- Infection
- Peripheral neuropathy
- Misinterpretation of data
- Misuse of equipment
2 Type of Transducers:
Wheatstone Bridge
Unbonded Strain Gauge
