Clinical Skills in Insulin Administration and Medication Reconstitution

Drawing Technique for Insulin Administration

Step 1: Draw Clear to Cloudy
- Start with clear insulin (such as regular insulin) and then move to cloudy insulin (such as NPH).
- Doing clear first ensures you don’t contaminate your clear dose with cloudy insulin during mixing.
Step 2: Prepare Injection
- Pull air into the syringe matching the dose to be injected.
- Insert the needle into the vial containing the clear insulin, push air in, flip it, and then draw the prescribed amount.
- Be cautious to avoid inserting the needle too deep so as not to mix with the cloudy insulin.
Step 3: Safety While Drawing
- Ensure that you are careful while drawing the insulin.
- Avoid overshooting as you cannot return the insulin back into the vial or body once drawn.

Insulin Concentration: The common concentration is 100 units/mL.
- It is important not to confuse this with a volume conversion to milliliters which holds no practical use in administration.

Sliding Scale Protocol: A system in which doses of insulin are administered based on blood glucose readings.
- Involves checking blood sugar before meals (AC) and at bedtime (HS).
Example:
- If a patient’s blood sugar is 204 mg/dL, the sliding scale might require 5 units of regular insulin.
- Conversely, if the blood sugar reading is 90 mg/dL, no insulin should be given; instead, offer some orange juice for treatment if low.
- If the blood sugar is 60 mg/dL or lower, administer 1 amp of D50 (dextrose) and notify the healthcare provider.

Functionality: Insulin pumps continuously monitor blood sugar levels and administer insulin as needed.
- One must change the pump site frequently to avoid tissue damage and maintain efficacy.
Monitoring: Insulin pumps help stabilize blood sugar levels but require regular monitoring by the user.

Blood Sugar Measurement: When blood sugar levels exceed 300 mg/dL, insulin is not administered; the healthcare provider should be notified immediately.
Rechecking: After giving D50 for very low blood sugar, recheck the levels in 15 minutes.
Formula for Insulin Calculation: For blood glucose greater than 150 mg/dL, the formula used for calculating insulin units is:
ext{Units of Insulin} = rac{ ext{Blood Glucose} - 100}{40}

Preparation of Medications: Many medications are in powder form and require reconstitution before administration.
- Use sterile water or bacteriostatic water for reconstitution; do not use normal saline.
Understanding Volume Changes: Mixing powder and liquid increases total volume.
Dosing Volume for Reconstitution: Follow instruction labels closely; the correct volume of diluent must be added to achieve desired strength and concentration.

For volumes less than 1 mL, round to the hundredths place. For volumes greater than 1 mL, round to the tenths place.
Injection volumes should not exceed 3 mL for intramuscular injections in adult patients.

Types of Insulin: Key types include Lispro (fast-acting), Regular (short-acting), NPH (intermediate), and long-acting forms.
- Lispro: Onset: 5 minutes, Peak: 1 hour, Duration: 2-4 hours. Cannot be mixed with other insulins.
- NPH: Cloudy appearance; Onset: 1-2 hours, Peak: 6-12 hours, Duration: 18-24 hours. Can be mixed with Regular insulin.

Syringe: Insulin syringes measure in units.
Gauge Differences: The larger the denominator, the smaller the needle (example: 14-gauge is larger than 28-gauge).
Mixing Instructions: Always put air in the first vial before injecting to equalize the pressure. When drawing insulin, clear insulin should be drawn before cloudy insulin. This ensures clarity and reduces contamination risk.

Always adhere to precise measurement and rounding guidelines when drawing or administering medications. This is crucial for ensuring patient safety and effective treatment administration. Each step in the medication administration process has significant impacts on patient health outcomes.