IV therapy Flashcards
(84 cards)
Purpose of IV therapy
- To maintain fluid, electrolyte & energy demands
- To prevent fluid and electrolyte imbalances
- To administer blood and blood products
- To administer TPN (total parental nutrition)
- To administer prescribed IV medications (ex: antibiotics)
- To have venous access in emergency situations: KVO (keep vein open)
Nursing responsibilities of IV therapy
- Assess need for IV therapy
- Assess IV site
- Assess/maintain prescribed IV flow rate
- Assess patient response to IV therapy
- Prevent complications associated with IV therapy
Fluid volume deficit (FVD) signs/symptoms
- Loss > 2.2lbs in body wt in 24hr
- Decreased B/P
- Tachycardia
- Slow cap refill
- Dry skin and mucous membranes
- Decreased skin turgor
- Thirst (later sign)
- Decreased urine output
- Confusion/restlessness (very late sign; only with severe deficit)
Fluid volume excess (FVE) signs/symptoms
- Gain > 2.2lbs in body wt in 24hr
- Bounding pulse
- Distended neck veins
- Abnormal lung sounds (e.g., crackles)
- Edema (often present in extremities, in the ankles)
Types of vascular access devices
1) Peripheral Vascular Access Devices (PVADs)
2) Central Vascular Access Devices (CVADs)
- Central Venous Catheters (CVC)
- Implanted infusion ports
- Peripherally inserted central catheters (PICC)
Peripheral vascular access uses
- Short term use
Central vascular access uses
- Long term use
- Medications and solutions irritating to veins
- Peripheral access is limited or contraindicated
- Large volumes of fluid
Central venous catheter (CVC)
Reasons we use
- For longer term use as well as for administration of medications that are irritant to the veins
- Patient has poor peripheral veins; cant find anywhere to put
- Large volumes of fluid
- Emergency situation need to secure immediate access
- Inserted by MD or NP; usually RN doesn’t insert
- Be mindful of infection; at high risk, make sure to assess regularly for sign/symptoms
- Infection indications; redness, swelling, purulent discharge, pain, fever
Other complications
- Penumothorax
- Arterial puncture during insertion
- Hemmorrage
- Cardiac tampinade
- Risk of nerve injury during insertion
- Occlusion
- Most have a tip that lies in the lateral portion of the superior vena cava
- Inserted through different major vessels, but tip consistent
Implanted infusion port (CVC)
- Implanted underneath the skin
- Accessed with specialized types of needles
- Found in special care; i.e. oncology
- Lower risk of infection; not exposed to air
Peripherally inserted central catheters (PICC)
- Central lines inserted through a peripheral vein; usually somewhere in the arm
- Long catheter; tip goes into the superior vena cava
- Mindful of infection; good hand hygiene, good aseptic technique
- Potential for CLABSI (central-line associated blood stream infections)
IV equipment
- IV cannulas (Sizes: 16G, 18G, 20G, 22G, 24G)
- Tourniquet
- Gloves
- Antiseptic swabs
- IV Dressing (transparent occlusive)
Common peripheral IV sites
- Inner arm/hands/feet
- Choose patient non-dominant hard
- Choose most distal site possible; if accidentally punctured, “blowing the vein” and no longer good – have to use distal to it instead of proximal
- Peds often use feet; not for adults patients, increased risk of clot formation in feet, in infants/small children not the same risk; older adults tend to have less venous return in lower extremities as well
- Avoid anywhere that has signs of infection, thrombosis, blood clot, if patient has graft/fistula for dialysis we don’t want to go in there
How to clean IV site before insertion
- Cleaning with cholorhexine solution or 70% alcohol
- Circulation motions for 30 seconds then let dry for 2 minutes
- Once site has been cleaned, we don’t want to touch it afterwards
- Use alcohol swab as a marker so you don’t touch it again
IV catheter/cannula
- Angle in insertion is 10-30 degrees
- Variety of different gages; smaller the number the large the diameter
- Only plastic tube gets left behind, the needle get taken out
- Flashback chamber; right site if blood appears in it
How do you decide on size of cannula?
- Size of the patient; their veins; older adults/children use 24G
- Viscosity of fluid you’re infusing
- Volume of fluid you’re infusing
- Diagnostic testing; CAT scans with IV contrast; department will have specifications of diameter (usually 18G)
IV dressing
- Dressing transparent to monitor and assess the site of insertion
- Also prevents organisms from entering the site
Changing an IV dressing
- Dressings are changed as per organizational policy
- Perform hand hygiene
- Apply gloves
- Remove old dressing being careful not to dislodge IV catheter
- Assess IV site
- Remove any additional tape and adhesive
- Clean site in a circular motion, working outwards with antiseptic swab, allow to dry
- Apply new dressing and secure with tape.
- Document as per policy (e.g., in chart and on dressing if required)
IV considerations: older persons
- Use a smaller gauge needle (22 – 24g)
- Choose site that does not interfere with ADLs
- Use minimal tourniquet pressure (over clothes)
- Lower angle of insertion
- Apply traction to the skin below insertion site
- Use a protective device
- Older adults have smaller veins and poor venous return
Want to minimize shearing forces on the skin itself; tourniquet on top of clothing - Traction on the skin; pulling downwards on the site while inserting
- Protective site; help protect it from getting knocked out while moving, etc.
- Arm board; limb placed on board and taped on to minimize movement
Types of IV fluids
1) Crystalloids
2) Colloids
3) TPN
IV fluids: crystalloids
- Contain solutes that mix, dissolve and cross semi-permeable membranes
- Smaller molecules
- Most common
- Examples;
NaCl
Dextrose
Lactated Ringer’s
IV fluids: colloids
- Contain proteins or starch that do not cross semi-permeable membranes
- Large molecules
- Remain in extracellular space / intravascular fluid
- Used to increase vascular volume (expand the vessel)
- Examples;
Blood
Plasma proteins
Pentastarch
IV fluids: total parenteral nutrition (TPN)
- Nutritionally adequate solution
- Typically 2 bags; yellow and lipid bag
- Exclusively infused via central line access, not peripherally
- Examples;
Glucose
Nutrients
Other electrolytes
Types of crystalloid IV solutions
Isotonic:
- Same osmolarity as blood
- Expands fluid volume without causing fluid to shift between compartments
- Create constant pressure within and outside cells
- Cells won’t shrink or swell in response; stay the same size
Hypotonic:
- Lower osmotic pressure
- Moves fluid into cells, causing them to enlarge
- Cause fluid to shift into intracellular space
- They hydrate the cells
Hypertonic:
- Higher solute concentration
- Pulls fluid away from cells, causing them to shrink
- Draw water out of intracellular space into extracellular space
- They dehydrate the cells
Body fluids: intracellular vs extracellular
Intracellular Fluid
- Fluid within the cells
- Accounts for 60% of body fluids
Extracellular Fluid
- Fluid outside of the cells
- Interstitial; between the cells and outside of the vessels
- Intravascular; blood plasma
- Transcellular; cerebrospinal fluid, peritoneal, synovial and GI tract
Common IV isotonic solutions
Uses:
- Volume replacement
- Treat diarrhea, vomiting, shock, resisitation
- Possibility of fluid overload
Examples:
- Normal Saline (0.9%)
- Dextrose 5% in water (D5W)
- Lactated Ringer’s (LR)