anesthesia notes

Pre-Lecture Study Blueprint Anesthesia & Postoperative Care Student Study Guide

I. Types of Anesthesia

  • General Anesthesia
      - Expected effects
        - CNS (Central Nervous System): General anesthesia involves the total inhibition of CNS activity, leading to loss of consciousness and sensation throughout the body.
        - Consciousness: Patients become unresponsive and unaware of their surroundings.
        - Reflexes: Reflexes are abolished, preventing movement during surgery.
      - Nursing implications
        - Airway management: Ensuring a secure airway is critical, as loss of consciousness can lead to airway obstruction.
        - Monitoring: Continuous monitoring of vital signs and anesthesia depth is essential.
      - Phases vs. Stages
        - Induction: The process from the beginning of anesthesia until loss of consciousness.
        - Maintenance: Sustaining a stable level of anesthesia during the surgical procedure.
        - Emergence: Transitioning from unconsciousness to wakefulness post-surgery.
        - Stages I-IV:
          - Stage I: Analgesia; patient is awake but may not feel sensations.
          - Stage II: Excitement; loss of consciousness, irregular breathing, potential for autonomic reflexes.
          - Stage III: Surgical anesthesia; desired stage for surgery with muscle relaxation.
          - Stage IV: Overdose; respiratory failure and potential cardiovascular collapse.
        - Dangerous Stage: Stage II is often the most dangerous due to potential for airway issues and autonomic instability; must monitor closely.
      - Management of airway: Always critical to have airway devices ready at all times.

  • Regional Anesthesia
      - How it works: Involves nerve blocking to eliminate sensation in specific body regions.
      - Patient status:
        - Patient may be awake or sedated, depending on the procedure.
      - Common uses:
        - Often used in orthopedic procedures, labor analgesia.
      - Key considerations:
        - High spinal: Causes significant hypotension and potential respiratory compromise; priority nursing action includes maintaining airway and supporting hemodynamics.

  • Moderate Sedation
      - Patient responsiveness: Patients may respond to verbal commands and stimuli but may not remember the sedation.
      - Airway status: Monitoring is essential as airway obstruction can occur.
      - Monitoring requirements: Continuous vital signs and consciousness assessment.
      - Key comparison to general anesthesia: Unlike general anesthesia, moderate sedation maintains a degree of consciousness; patients are less critical in terms of airway support compared to general anesthesia.

  • Local Anesthesia
      - Where it acts: Local anesthetics block nerve conduction at the site of administration.
      - Common examples: Lidocaine, bupivacaine.
      - Vasoconstrictors: Added to prolong the effects and minimize bleeding at the site by reducing blood flow.

II. Medications & Their Roles

  • Neuromuscular Blocking Agents
      - Purpose: These agents induce paralysis to facilitate surgical procedures; they do not affect consciousness or pain perception.
      - Examples: Succinylcholine, rocuronium.
      - Critical safety implication: Must ensure the patient is adequately sedated alongside paralysis.
      - Consideration: A patient may be paralyzed yet fully awake if not adequately sedated.

  • General Anesthetic Agents
      - Inhalation vs. IV agents:
        - Inhalation: Administered via gas or vapor; examples include isoflurane, nitrous oxide.
        - IV: Administered through intravenous route; examples include propofol, etomidate.
      - Common drugs: List includes various IV and inhalation agents along with safety profiles.
      - Special considerations: Check for patient allergies before administration.

  • Adjunct Medications
      - Purpose: Enhance anesthesia effect and manage side effects; must know the purpose of each, beyond just their names.

  • Opioids
      - Effects: Provide analgesia, sedation, and can produce euphoria.
      - Major risk: Respiratory depression, potential for addiction.
      - Monitoring priority: Continuous monitoring of respiratory rate and depth.
      - Reversal agent: Naloxone, used in cases of overdose.

  • Benzodiazepines
      - Effects: Provide anxiety reduction, amnesia, and sedation effects.
      - Major risk with rapid administration: Can lead to respiratory depression or oversedation.
      - Reversal agent: Flumazenil, used in benzodiazepine overdose cases.

  • Antiemetics
      - Why used postoperatively: To prevent nausea and vomiting, which can lead to complications.
      - Common side effects: Drowsiness, dry mouth.

  • Anticholinergics
      - Why used in surgery: To reduce secretions and counteract bradycardia.
      - Expected effects on secretions and heart rate: Decrease in saliva, bronchial secretions, and increase in heart rate.

III. Complications of Anesthesia

  • General Complications
      - Airway issues: Risk of obstruction or aspiration; must intervene rapidly.
      - Hypoventilation: May lead to inadequate oxygenation.
      - Awareness during surgery: Rare but possible; patients may recall painful stimuli or sounds.
      - Patient experience: Monitor for potential awareness; can lead to psychological distress.

  • Malignant Hyperthermia
      - Cause: Triggered by certain anesthetic agents, often succinylcholine or volatile agents.
      - Key signs: Rapid increase in body temperature, muscle rigidity, tachycardia, hypercapnia.
      - Life-threatening reasons: Causes severe muscle breakdown and metabolic may lead to cardiac arrest if not treated.
      - Priority actions: First action is to discontinue triggering agents and administer Dantrolene, which treats the condition.

IV. Nursing Responsibilities During Anesthesia

  • Consent: Verify informed consent has been obtained prior to the procedure.

  • NPO status: Ensure adherence to nothing by mouth (NPO) guidelines to reduce aspiration risk.

  • Monitoring priorities: Continuous monitoring of vital signs (heart rate, blood pressure, respiratory rate, oxygen saturation).

  • Moderate Sedation Responsibilities
      - Continuous presence: The nurse must be in attendance throughout the procedure to monitor patient status.
      - Specific monitoring: Heart rate, respiratory rate, oxygen saturation, level of consciousness.
      - Emergency preparedness: Ready access to emergency medications and equipment to manage adverse events.

V. Postoperative Complications & Care

  • Respiratory Complications
      - Atelectasis: Collapse of lung tissue post-surgery due to shallow breathing; requires interventions such as deep breathing exercises.
      - Prevention strategies: Early mobilization, incentive spirometry to encourage deep breathing.
      - Importance of early ambulation: Stimulates metabolism and aids in gas exchange, reducing the risk of complications.

  • VTE (DVT/PE)
      - Risk factors: Prolonged immobility, surgical length, obesity, previous history of thromboembolic events.
      - Prevention: Use of compression devices, early ambulation, anticoagulant prophylaxis as needed.
      - Assessment findings: Monitor for signs of deep vein thrombosis (DVT) such as swelling, redness, tenderness in the leg.

  • Fluid Imbalances
      - Hypovolemia vs. hypervolemia: Understanding fluid balance is crucial; hypovolemia may indicate inadequate fluid replacement, while hypervolemia can lead to cardiac overload.
      - Assessment cues: Monitor vital signs for hypotension or hypertension, respiratory effort, and fluid input/output.

  • Wound Complications
      - Dehiscence vs. evisceration:
        - Dehiscence: Partial or complete separation of the wound layers.
        - Evisceration: Protrusion of organs through a wound; requires immediate surgical intervention.
      - Nursing response: Apply sterile dressing, monitor for signs of infection, and alert surgical team immediately.

VI. Postoperative Assessment

  • System-based priorities
      - Respiratory: Assess breath sounds, respiratory rate, oxygenation status.
      - Cardiovascular: Monitor heart rate, blood pressure, capillary refill, and signs of shock.
      - Neurologic: Evaluate consciousness level, pupil response, limb movement capability.
      - GI: Check for bowel sounds, nausea, and any signs of ileus.
      - Renal: Monitor urine output, hydration status.
      - Integumentary: Inspect surgical site for drainage, redness, or signs of infection.

  • Assessment prioritization: Respiratory assessment is assessed first due to the high risk of complications in this area after anesthesia.

VII. Pain Management

  • Focus areas
      - Assessment tools: Use appropriate pain scales to gauge patient discomfort.
      - Medication types: Familiarize with various analgesics (non-opioids and opioids) and implementation guidelines.
      - PCA (Patient-Controlled Analgesia): Allows patients to self-administer pain relief via a pump, providing control and enhancing comfort.
      - Nonpharmacologic strategies: Incorporate techniques such as relaxation, distraction, and guided imagery.
      - Rationale for multimodal pain control: Reduces the need for high doses of opioids thereby minimizing side effects and enhancing pain relief effectiveness.

VIII. Post-Procedure Monitoring

  • Focus areas
      - Return to baseline: Monitor recovery of sensorium and vital functions to ensure stability post-anesthesia.
      - Airway and breathing: Confirm airway patency and adequate breathing effort continuously.
      - Bleeding: Assess surgical site and surrounding areas for excessive bleeding.
      - Intake and output: Monitor fluids to ensure adequate hydration and renal function.

IX. Clinical Judgment Focus

  • Expectations of nursing
      - Recognize cues: Identify early signs of complications and deviations from expected recovery patterns.
      - Analyze complications: Utilize critical thinking to evaluate and prioritize necessary nursing interventions.
      - Prioritize interventions: Determine which nursing actions must be taken first based on assessed needs.
      - Evaluate outcomes: Review patient responses to interventions in order to gauge effectiveness and adjust care plans as necessary.
      - Application over memorization: Students will be expected to apply knowledge practically rather than merely memorize facts.