Complex 1D

Announcements and Reminders

• Quiz Review:

  • The quiz on Tuesday went well for most students.

  • Office hours are available on Mondays from 12 to 1 for review and guidance, including a review of that information.

  • Other faculty members will be present to assist with exam preparation.

Introduction to IV Fluids

• New Section: The IV fluids section is new, and the timing and content are subject to change.

• Importance: This section addresses the critical role of fluid and electrolyte balance in patient care, an area identified as potentially lacking in students' prior knowledge.

• Take-Home Points:

  • Fluid and electrolyte imbalances can have life-threatening consequences.

  • Improper administration of IV fluids can cause significant harm.

  • Basic knowledge and nursing assessments are crucial for preventing patient harm.

  • IV fluids are considered medications, requiring familiarity with their actions, appropriate uses, and contraindications.

  • Identify common disease processes that can cause fluid and electrolyte imbalance

  • Recognize abnormal electrolytes based on signs and symptoms (cheat sheet provided in the module).

  • Differentiate among the types of IV fluids and their uses.

Why IV Fluids Matter

• Clinical Significance:

  • Nurses spend significant time managing IV fluids and equipment.

  • Balanced fluid and electrolytes are essential for patient recovery and homeostasis.

  • IV fluids play a critical role in perfusion.

• Potential Risks:

  • IV fluids are often perceived as benign, but they can be dangerous.

• Personal Anecdote:

  • A patient with a mental disability died due to improper fluid management.

  • The patient's low sodium levels were overcorrected with a hypertonic solution.

  • Nurses and physicians failed to recognize changes in the patient's mental status, attributing it to his disability.

  • The delay in recognition and proper intervention led to a fatal outcome, due to overcorrection.

Patients at Risk for Electrolyte Problems

• Populations:

  • Elderly adults

  • Patients with kidney problems (kidneys regulate fluid and electrolyte balance)

  • Patients with heart problems (risk of fluid volume overload)

  • Babies and children (large skin surface area contributes to dehydration)

  • Individuals with endocrine problems

Assessing Fluid and Electrolyte Problems

• Key Assessments:

  • Changes in level of consciousness:

    • New onset of confusion (can also indicate changes in oxygenation, infection, fever, medication side effects)

  • Changes in urine output:

    • Decreased output indicates the kidneys are trying to conserve water.

  • Changes in vital signs:

    • Tachycardia (increased heart rate) occurs because organs demand oxygen, and the heart compensates by working harder.

    • Possible increase in temperature due to decreased circulating water.

  • Changes in body weight:

    • Significant weight loss indicates fluid loss; monitor trends against the patient's healthy weight.

    • Example: A 12-pound weight loss in three weeks is significant.

  • Changes in heart and lung assessment:

    • Increased heart rate, potential heart failure in patients with pre-existing heart conditions.

    • Crackles in lungs indicate fluid overload.

    • Shortness of breath.

  • Changes in skin and mucous membranes:

    • Edema indicates fluid overload.

    • Poor skin turgor indicates dehydration.

    • Healthy mucous membranes should be pink and moist.

Types of IV Fluids

• Two Main Categories:

  • Colloids: Blood products (whole blood, packed red blood cells, albumin, fresh frozen plasma). They are like syrup and last longer.

  • Crystalloids: Most common (will be the main focus). Similar to water in consistency.

• Colloids:

  • Examples: Fresh frozen plasma, packed red blood cells, albumin.

  • Require extensive testing to prevent allergic reactions.

  • More expensive than crystalloids.

• Crystalloids:

  • Smaller molecules that work fast.

  • Easily accessible and less expensive.

  • Low risk of allergic reaction.

Worksheet Overview

• Content: Differences between isotonic, hypotonic, and hypertonic IV fluids.

• Subsequent Case Study to follow after the worksheet.

Key Concepts in IV Fluids

• Tonicity: The tone of the IV fluid.

• Osmolality: How much "stuff" (solutes) is in the water.

  • Determines the tonicity.

• Isotonic Solutions:

  • Mimic the osmolality of blood and serum (approximately 280-310).

  • Maintain water levels in the body.

• Importance of Sodium: Sodium content is the primary factor in determining fluid type.

IV Fluid Cells

• Isotonic:

  • The osmolality is approximately $280$ to $310$. It keeps water levels in the body the same when administered.

• Hypotonic:

  • Has fewer solutes and more water compared to isotonic solutions.

• Hypertonic:

  • Has more solutes and less water compared to isotonic solutions.

  • Osmolality is greater than $300$, making it heavier and saltier than blood serum.

Fluid Shifts

• Basic Principle: Water moves to balance solute concentrations.

• Isotonic Solutions: No fluid shifts occur.

• Hypotonic Solutions:

  • Water moves outside the cell, leading to potential edema, fluid in the lungs (crackles), diarrhea, and increased intracranial pressure.

• Hypertonic Solutions:

  • Pulls water from other areas of the body (interstitial space, cells).

    • Decreased urine output.

  • Can cause sudden decreases in intracranial pressure, potentially leading to cellular damage in the brain if done too quickly.

Clinical Implications

• Importance of Monitoring: Nurses must monitor patients closely when they are receiving IV fluids.

• Questionable Orders: Question any orders that seem questionable or make you uncomfortable.

• ICU Transfers: Consider transferring patients receiving hypertonic solutions to the ICU for closer monitoring.

Common Isotonic IV Fluids

• Normal Saline (0.9% Sodium Chloride):

  • Matches the salt concentration of blood and serum, approximately $0.9\%$. With an estimated osmolality of $308$.

• Lactated Ringer's (LR):

  • Contains less salt but includes potassium, calcium, and buffers.

  • Commonly used in surgery.

  • Estimated osmolality of $275$.

Common Hypotonic IV Fluids

• Half Normal Saline (0.45% Sodium Chloride):

  • Has half the salt content of normal saline.

  • Osmolality of Half NS is $154$.

• D5W (5% Dextrose in Sterile Water):

  • Contains 5% dextrose, a sugar easily metabolized by cells.

  • Osmolality is $253$.

Common Hypertonic IV Fluids

• 3% Saline (Hot Salts):

  • Has three times the osmolality of 1% saline.

  • Osmolality is $1027$.

  • Rarely used and requires close monitoring in the ICU.

• 5% NS:

  • Extremely rare and used only in severe cases of cerebral edema when death is imminent without intervention.

  • If 1% is $308$, then 5% is aproximately $1500$.

Dextrose Considerations

• Metabolism: Dextrose is rapidly metabolized by the body.

• Shifts: When dextrose is added to a crystalloid solution, it acts like pressure to go through more quickly.

• D5W: Although technically hypotonic, it rapidly shifts to a lower osmolality as dextrose is metabolized.

• Uses: Even patients with diabetes sometimes require dextrose IV fluids.

• Cellular Needs: Cells need water, sugar, and oxygen to survive.

D5 Half NS

• Composition: 5% Dextrose in Half Normal Saline.

• Sodium is King: Always start with sodium content to classify.

• Base Solution: Half NS (hypotonic).

• Initial Osmolality: $405$ (almost hypertonic).

• Shift: Dextrose is quickly metabolized, causing the osmolality to drop to approximately $280$ (isotonic).

• Classification: Starts as slightly hypertonic but quickly becomes isotonic.

D5 Half NS with 20 mEq Potassium Chloride

• Composition: 5% Dextrose in Half Normal Saline with 20 mEq Potassium Chloride.

• Sodium is King: Sodium content is half NS (hypotonic).

• Impact of Potassium: Potassium adds to the osmolality.

• Initial Osmolality: $446$ (hypertonic).

• Shift: Dextrose is metabolized, reducing osmolality to approximately $300$ (isotonic).

• Practitioner Decision: Choose based on patient's potassium levels and kidney function (avoid in kidney problems).

D5NS

• To determine the type of IV fluid, start with sodium, because sodium is king.

Clinical Uses of IV Fluids

• Isotonic Solutions:

  • Fluid Maintenance: Primary fluid for routine maintenance.

  • Dehydration: Ideal for patients with dehydration from vomiting, diarrhea, or heat exposure.

  • Carrier Fluid: Used to carry other IV medications (e.g., morphine, sedatives).

  • Post-Surgery: Very commonly used post-surgery.

  • Potassium Chloride: Added to IV fluids to help dilute as Potassium Chloride hurts the vein.

• Hypotonic Solutions:

  • Fluid Maintenance: Used carefully if a little extra water is needed.

  • Dehydration: Used carefully for dehydration if the patient does not have low sodium.

  • Hypernatremia: Used for dehydration with increased sodium levels.

  • Diabetic Ketoacidosis (DKA): Balances out cells so the sugar can disperse.

• Hypertonic Solutions:

  • Severe Hyponatremia: Used very rarely, with slow drip and frequent assessment, preferably in the ICU.

Contraindications for IV Fluids

• Isotonic Solutions:

  • Kidney Problems: Lactated Ringers (LR) should not be used due to added potassium and calcium.

• Hypotonic Solutions:

  • Low Sodium: Should not be used as it can worsen the condition.

  • Traumatic Brain Injury or Cerebral Edema: Contraindicated due to the risk of increasing fluid in the brain.

  • Traumas and Burns: Require special protocols (e.g., Parkland formula) for fluid management.

• Special Considerations for Burns:

  • Parkland Formula: Determines the amount of fluid to administer based on the extent of the burn.

• Hypertonic Solutions:

  • High Sodium: Contraindicated as it will further increase sodium levels.

  • Severe Dehydration: Should not be used as it removes more water from the body.

  • Heart or Kidney Problems: High risk due to massive fluid shifts.

  • Administration: Should only be used temporarily and for critical needs, then switch to isotonic solutions for maintenance.

Key Takeaways

• Focus: Basic understanding of what fluids do, when they are used, how they can be helpful, and how they can be harmful.

• Assessment: Importance of assessing patients for signs of fluid and electrolyte imbalances.