vn117 2014. 1. to provide and maintain daily maintenance fluid requirements. 2. to correct...
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Vn117 2014
FLUID THERAPY
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1. To provide and maintain daily maintenance fluid requirements.
2. To correct dehydration by supplying fluid deficit.
3. To replace essential electrolytes.
4. To provide a vehicle for intravenous medications
5. In emergency fluid or blood replacement following shock or haemorrhage.
6. To control hypovolaemia and maintain blood pressure during surgery.
REASONS FOR FLUID THERAPY
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ICF (40% of BWT) ECF (20% of BWT)
Intersitial fluid Plasma
15% BWT 5% BWT
FLUID COMPOSITION OF THE BODYTOTAL BODY FLUID =60% OF BWT
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• Per os• S/C• I/P• I/V• I/O
• Only I/V and I/O suitable for severe shock or dehydration
ROUTES OF FLUID ADMINISTRATION
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• Accessible veins in different species• Avoidance of damaged veins, phlebitis or veins that
would cause catheter flexion as joints move• Duration of catheterisation
• Limb catheters are less likely to cause serious complications but jugular catheters are well tolerated and may be suited to chondrodystrophic dogs and mobile patients that tend to tangle limb catheters
FACTORS AFFECTING THE CHOICE OF VEIN
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IV CATHETERS
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BUTTERFLY CATHETERS
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OVER THE NEEDLE CATHETERS
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Seddinger over the wire catheter
JUGULAR CATHETERS
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PEEL AWAY CATHETERS
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Gauge
Should be the largest that does not cause damage to the vein or thrombosis due to inadequate flow past the catheter
Catheter length
Longer is more stable but it must not be so long it kinks at the flexion of a joint or enters the heart
CATHETER GAUGE AND LENGTH
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standard surgical prep required for the site and administrator hands
avoid clipper burn and ensure the site is dry before placement
PREP OF THE SITE
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60 drop per ml sets should be used for patients under 10kg
Paediatric burettes can be inserted in the line for accurate delivery of small volumes
Plugs 3 way taps and t-port connectors can be used to allow the set to be disconnected at times
FLUID SETS
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Use page 6 of your notes to make a poster about safety and trouble shooting the drip
SAFETY PRECAUTIONS AND TROUBLE SHOOTING THE
DRIP
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Chrystalloids
• Isotonic• 0.9%saline, LRS/hartmanns
• Hypertonic• 7%saline solution
• crenation
• Hypotonic • 5% dextrose in water
• haemolysis
Colloids
• Used to correct hypovolaemia /hypoprotienaemia
• Tend to cause platelet and clotting function problems
• Dextran and hetastarch
CHOICE OF FLUIDS
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• Physical exam observations can give an estimate of hydration status to use in calculation of fluid deficit/rehydration volume required
• Or• PCV can be used to evaluate the fluid deficit
• Maintenance fluid can be estimated at 50 mls/kg /day
• Ongoing losses are estimated from observed losses from vomiting diarrhoea and extra urinary losses due to the disease condition
PATIENT ASSESSMENT AND CALCULATION OF FLUID REQUIRED
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• Monitor for over infusion, phlebitis, fluids that have stopped flowing, infection and correct placement of the catheter in the vein
MONITORING THE DRIP