Rapid Sequence Intubation (RSI): Procedure and Key Concepts

Rapid sequence intubation (RSI) is an emergency airway-management technique used when a patient needs rapid control of the airway. It involves giving medications to quickly produce unconsciousness and, when needed, muscle paralysis so an endotracheal tube can be placed safely and efficiently.

RSI is commonly used when a patient cannot maintain ventilation, oxygenation, or airway protection on their own.

Because the procedure can quickly remove the patient’s ability to breathe spontaneously, it requires careful preparation, proper equipment, skilled personnel, and a clear backup plan.

What Is Rapid Sequence Intubation?

Rapid sequence intubation is a controlled method of placing an endotracheal tube into the trachea under urgent conditions. The goal is to secure the airway quickly while reducing the risk of complications such as aspiration, hypoxemia, and failed airway control.

In respiratory care, RSI is important because it connects emergency airway management with mechanical ventilation. Once the endotracheal tube is placed, the patient often requires immediate ventilatory support. This means the procedure does not end when the tube passes through the vocal cords. The respiratory therapist and care team must confirm tube placement, secure the airway, provide oxygenation and ventilation, monitor the patient’s response, and make adjustments as needed.

RSI is not simply “fast intubation.” It is a structured process that includes patient assessment, preparation, preoxygenation, medication administration, intubation, tube confirmation, and post-intubation stabilization. Each step is designed to reduce risk during a high-stakes airway procedure.

Why Rapid Sequence Intubation Is Used

RSI is used when rapid airway control is necessary. This may occur when a patient cannot protect the airway, cannot ventilate adequately, cannot oxygenate adequately, or is clinically deteriorating.

Common indications include severe hypoxemia, airway obstruction, severe brain injury, abnormal respiratory frequency, hemodynamic instability, and high aspiration risk. A patient with altered mental status may lose the ability to protect the airway from secretions, vomit, or blood. A patient with severe respiratory failure may be unable to maintain adequate oxygen or carbon dioxide levels. A trauma patient may require airway protection before swelling, bleeding, or neurologic decline makes intubation more difficult.

RSI is also commonly used for conscious patients who have not fasted and are at high risk for aspiration. This is an important concept for board exams and clinical practice. A conscious patient may still have airway reflexes, stomach contents, anxiety, and resistance to airway manipulation. RSI allows the provider to rapidly induce unconsciousness and, if needed, paralysis so the tube can be placed quickly while minimizing prolonged bag-mask ventilation.

Manual ventilation before intubation can sometimes force air into the stomach, especially if excessive pressure is used. Gastric insufflation increases the risk of regurgitation and aspiration. For this reason, RSI is often designed to avoid unnecessary manual ventilation before the cuffed endotracheal tube is placed.

Goals of Rapid Sequence Intubation

The primary goal of RSI is to quickly secure the airway with an endotracheal tube. However, several additional goals are equally important.

• To support oxygenation. Patients who need RSI are often hypoxemic or at high risk of becoming hypoxemic during the procedure. Preoxygenation helps increase the oxygen reserve before apnea occurs.
• To support ventilation. A patient with respiratory failure may be unable to remove carbon dioxide effectively. Once the airway is secured, mechanical ventilation can be started to improve alveolar ventilation and gas exchange.
• To reduce aspiration risk. Many patients who require emergency intubation are not fasting, may have a full stomach, or may have impaired airway reflexes. RSI attempts to minimize the time between loss of consciousness and cuffed tube placement.
• To create better intubating conditions. Sedation and paralysis can reduce gagging, coughing, laryngospasm, resistance, and patient movement. This can make endotracheal tube placement faster and more controlled.

When RSI May Not Be Appropriate

RSI is not appropriate for every patient. If a patient can maintain adequate ventilation and oxygenation while breathing spontaneously, immediate RSI may expose the patient to unnecessary risk. In these cases, careful observation, noninvasive support, or a less urgent airway approach may be more appropriate.

RSI is also generally not used for unconscious patients who require immediate crash airway management. In a true crash airway situation, the patient may need immediate manual ventilation and intubation without waiting for anesthesia induction or paralysis. This distinction is important. RSI is used when there is enough time to prepare and give medications in a controlled sequence. A crash airway requires immediate action because the patient is already unconscious, apneic, or near arrest.

RSI should not be attempted by someone unfamiliar with the procedure, equipment, medications, or backup airway options. Once sedatives and paralytics are administered, the patient may become apneic and unable to protect the airway. If the provider cannot intubate or ventilate, the situation can rapidly become life-threatening.

Preparation Before RSI

Preparation is one of the most important parts of RSI. Once medication is given, the team has limited time to secure the airway. Every piece of equipment should be gathered, checked, and ready before induction.

Essential preparation includes a cardiac monitor, pulse oximeter, oxygen source, suction, intravenous access, bag-valve-mask device, advanced cardiovascular life support medications, and an appropriately sized endotracheal tube. A laryngoscope or video laryngoscope should be prepared, and the blade should be checked for proper function. A stylet, bougie, syringe for cuff inflation, tube-securing device, capnography, and backup airway equipment should also be available.

A cricothyrotomy tray or surgical airway equipment should be ready in case intubation fails and ventilation cannot be maintained. This preparation reflects the seriousness of RSI. The team must be ready for a “cannot intubate, cannot ventilate” emergency.

Note: The respiratory therapist may help prepare the equipment, check the endotracheal tube cuff for leaks, lubricate the tube, prepare suction, set up oxygen delivery, and ensure that ventilator equipment is ready after intubation.

Preoxygenation

Preoxygenation is performed before RSI to increase the oxygen reserve in the lungs. The goal is to replace nitrogen in the functional residual capacity with oxygen, giving the patient more time before oxygen saturation falls during apnea.

Preoxygenation is commonly performed with 100% oxygen. The patient’s oxygen saturation should be monitored continuously with pulse oximetry. However, clinicians must remember that pulse oximetry does not always provide a complete picture. For example, in carbon monoxide poisoning, pulse oximetry may appear falsely normal because many pulse oximeters cannot distinguish oxyhemoglobin from carboxyhemoglobin.

In critically ill patients, oxygen saturation can fall quickly even after preoxygenation. Patients with pneumonia, pulmonary edema, ARDS, severe asthma, obesity, pregnancy, or shock may have reduced oxygen reserves. These patients require especially careful planning because they may desaturate rapidly during laryngoscopy.

Medications Used in RSI

Medication use is central to RSI. The typical medication sequence includes an induction agent to produce unconsciousness and a neuromuscular blocking agent to produce paralysis.

• Etomidate is commonly used as an induction medication because it has a rapid onset and is often used in emergency airway management. It helps produce sedation and unconsciousness so the patient can tolerate laryngoscopy and intubation. A commonly referenced adult dose is 0.3 mg/kg IV, or approximately 20 mg IV, given over 30 to 60 seconds.
• Succinylcholine is a commonly used depolarizing neuromuscular blocker. It has a rapid onset, often around 30 to 60 seconds, and a relatively short duration, often around 8 to 10 minutes. A commonly referenced adult dose is 1 to 1.5 mg/kg IV, or approximately 100 mg IV.
• Rocuronium is a nondepolarizing neuromuscular blocker that may also be used for RSI. It is often considered when succinylcholine is contraindicated. Other medications may be used depending on the patient’s condition, including midazolam, fentanyl, lidocaine, and post-intubation sedatives or analgesics.

Note: Medication choice should be based on the patient’s clinical condition, the reason for intubation, hemodynamic status, neurologic concerns, and contraindications.

Important Medication Safety Points

One of the most important safety points in RSI is that paralytics do not provide sedation, amnesia, or pain control. A paralyzed patient may be unable to move, breathe, or communicate but may still be aware or in pain if sedation and analgesia are inadequate. For this reason, neuromuscular blockers must be paired with appropriate sedation, and analgesia should be considered when pain is present.

Sedatives also do not reliably provide pain control. They may reduce anxiety, produce amnesia, or cause unconsciousness, but they do not replace analgesics when the patient is experiencing pain. This is especially important after intubation, when the endotracheal tube, mechanical ventilation, trauma, procedures, or underlying disease may cause discomfort.

Succinylcholine has several important contraindications. It should be avoided in patients with a family history of malignant hyperthermia. It is also contraindicated in penetrating eye injury, hyperkalemia, chronic muscular conditions such as muscular dystrophy, and severe burns or crush injuries that are several days old. These conditions increase the risk of dangerous complications, including severe hyperkalemia.

Note: Because RSI medications have rapid onset, the clinician must be ready to intubate before they are administered. Giving sedatives or paralytics before equipment and personnel are prepared can create a dangerous delay in airway control.

Cricoid Pressure

Cricoid pressure, also called Sellick’s maneuver, has traditionally been used during RSI to reduce the risk of passive regurgitation and aspiration. The technique involves applying pressure to the cricoid cartilage to compress the esophagus.

The purpose is to help prevent stomach contents from entering the pharynx during the period between loss of consciousness and successful placement of the cuffed endotracheal tube. This aligns with one of the main goals of RSI, which is to protect the airway from aspiration.

However, cricoid pressure must be applied carefully. Excessive pressure can distort the airway, worsen the laryngoscopic view, or obstruct ventilation. If cricoid pressure makes intubation or ventilation more difficult, the team may need to adjust or release it. The key point is that cricoid pressure is not a simple automatic step. It requires proper technique, communication, and awareness of airway patency.

Intubation During RSI

Once unconsciousness and respiratory muscle relaxation are achieved, oral endotracheal intubation is performed. The provider visualizes the vocal cords and passes the endotracheal tube through the glottic opening into the trachea.

Direct visualization of the tube passing through the vocal cords is one of the most important ways to prevent esophageal intubation. If the vocal cords cannot be clearly seen or identified, the tube should not be blindly inserted. Instead, another experienced provider may need to attempt intubation, or alternative airway equipment may be required.

Difficult intubation can occur because of limited mouth opening, poor positioning, unusual airway anatomy, trauma, swelling, blood, secretions, or obesity. Special tools may be helpful, including video laryngoscopy, different laryngoscope blades, specialized stylets, and a bougie. A bougie can be passed through the glottic opening first, allowing the endotracheal tube to be advanced over it into the trachea.

The care team should avoid prolonged intubation attempts. Long attempts increase the risk of hypoxemia, bradycardia, aspiration, and cardiac arrest. If intubation is unsuccessful, oxygenation and ventilation must be restored, and the backup airway plan should be activated.

Confirming Tube Placement

Tube placement must be confirmed immediately after intubation. An unrecognized esophageal intubation can be fatal because the patient may receive no effective ventilation despite the appearance of airway management.

Initial confirmation includes observing chest rise, auscultating for bilateral breath sounds, listening over the epigastrium, checking oxygen saturation, and assessing the patient’s clinical response. However, clinical assessment alone is not enough.

Carbon dioxide detection is a key method for confirming tracheal placement. Colorimetric CO₂ detectors change color in the presence of exhaled carbon dioxide. A typical color change from purple to tan or yellow suggests that the tube is in the trachea. Continuous waveform capnography is especially useful because it provides ongoing evidence of ventilation.

However, carbon dioxide detection must be interpreted in context. During cardiac arrest, exhaled carbon dioxide may be very low because pulmonary blood flow is poor. This can produce a false-negative reading even when the tube is correctly placed. Once effective chest compressions improve blood flow to the lungs, end-tidal carbon dioxide should increase.

CO₂ detection also does not identify mainstem bronchial intubation. A tube advanced too far may enter the right mainstem bronchus, causing ventilation of one lung and possible collapse of the other. For this reason, breath sounds, tube depth, chest movement, and chest x-ray remain important.

Post-Intubation Stabilization

After the endotracheal tube is placed and confirmed, the patient must be stabilized. The tube should be secured, cuff pressure should be checked, and the insertion depth should be documented. The patient should be connected to appropriate oxygen and ventilatory support.

Mechanical ventilation settings must be selected based on the patient’s condition. Initial settings may include oxygen concentration, tidal volume or pressure target, respiratory rate, PEEP, inspiratory flow or inspiratory time, sensitivity, humidification, and alarms. The patient’s response should be assessed through vital signs, breath sounds, chest rise, oxygen saturation, end-tidal carbon dioxide, airway pressures, and arterial blood gases when needed.

Sedation and analgesia must continue after RSI when clinically indicated. The patient may be frightened, uncomfortable, or dyssynchronous with the ventilator. If paralysis is continued, sedation and analgesia become even more important because the patient cannot communicate distress.

Possible post-RSI medications may include sedatives, analgesics, and longer-acting neuromuscular blockers. Examples include fentanyl for analgesia, benzodiazepines such as diazepam or midazolam for sedation, and agents such as vecuronium when continued paralysis is needed. Medication selection should always be based on the patient’s condition and provider orders.

The Respiratory Therapist’s Role

The respiratory therapist plays an important role before, during, and after RSI. Before the procedure, the therapist may assist with airway assessment, oxygenation, equipment preparation, suction setup, and ventilator readiness.

During the procedure, the therapist may assist with preoxygenation, monitor oxygen saturation, provide airway equipment, help maintain cricoid pressure if directed, assist with suctioning, and prepare for bag-mask ventilation if needed. The therapist must also be ready to help with alternative airway devices or emergency ventilation if the initial attempt fails.

After intubation, the therapist helps confirm tube placement, evaluates breath sounds, monitors capnography, secures or assists in securing the tube, checks cuff pressure, connects the patient to the ventilator, and assesses the patient’s response. The therapist also helps identify complications such as mainstem intubation, tube obstruction, cuff leak, ventilator disconnection, high airway pressure, inadequate ventilation, or worsening oxygenation.

Note: Documentation is also important. This may include tube size, insertion depth, confirmation method, oxygenation status, ventilator settings, patient response, and any complications.

RSI in Traumatic Brain Injury

RSI may be indicated in traumatic brain injury when the patient cannot protect the airway or has a Glasgow Coma Scale score of 8 or less. In this setting, airway control helps prevent aspiration, supports oxygenation, and allows control of ventilation.

Avoiding hypoxemia and hypercapnia is especially important in brain injury because both can worsen secondary brain injury. Hypoxemia reduces oxygen delivery to the brain, while hypercapnia can increase cerebral blood flow and potentially worsen intracranial pressure.

Medication selection may be influenced by neurologic status. Some protocols include lidocaine when intracranial pressure is elevated, and fentanyl may be considered to blunt the sympathetic response to laryngoscopy. The care team must balance airway control with hemodynamic stability, oxygenation, ventilation, and neurologic goals.

Note: If oral or nasal intubation cannot be performed because of airway trauma, a surgical airway such as cricothyrotomy or tracheotomy may be needed.

RSI in Epiglottitis and Difficult Airways

Epiglottitis is an airway emergency that requires careful management. Airway manipulation can worsen obstruction, especially in pediatric patients. Procedures that agitate the patient or worsen swelling should be minimized.

When intubation is needed, it should be performed under controlled conditions by skilled personnel. Fiberoptic-assisted intubation or other advanced techniques may be used. RSI may be part of the controlled approach, but the team must be prepared for failed intubation and worsening obstruction.

Note: If intubation cannot be accomplished and airway obstruction persists or worsens, emergency surgical airway procedures may be necessary. This is why preparation and backup planning are essential.

RSI in Tetanus

Tetanus can affect ventilation and upper-airway function. If airway function becomes compromised, intubation, mechanical ventilation, and intensive care may be required.

Airway manipulation in tetanus can trigger severe reflex laryngospasm. RSI with an appropriate paralytic may be recommended to reduce the risk of dangerous airway reflexes during intubation. This example shows that RSI is not only about aspiration risk. It may also be used when airway manipulation itself can trigger severe physiologic responses.

RSI in Burns, Inhalation Injury, and Carbon Monoxide Poisoning

Patients with burns and inhalation injury may require early airway management. Airway swelling can worsen over time, making later intubation more difficult or impossible. Early intubation may be needed before obstruction becomes severe.

Inhalation injury can also cause thick secretions, airway inflammation, impaired mucociliary clearance, toxic debris, atelectasis, and infection risk. These problems can worsen oxygenation and ventilation.

Carbon monoxide poisoning is another situation where RSI may be required. A patient with severe poisoning may have neurologic deterioration, tachypnea, tachycardia, metabolic acidosis, and impaired oxygen delivery. Pulse oximetry can appear falsely normal, so blood gas analysis and co-oximetry are important for accurate assessment.

During and after intubation in carbon monoxide poisoning, 100% oxygen is typically used to help displace carbon monoxide from hemoglobin and improve oxygen delivery. Deep sedation and paralysis may reduce oxygen consumption in critically ill patients.

Risks and Complications of RSI

RSI can be lifesaving, but it has significant risks. Sedatives and paralytics can cause apnea, hypotension, and loss of protective airway reflexes. Paralysis removes the patient’s ability to breathe spontaneously or compensate for worsening gas exchange.

Intubation itself can cause trauma to the lips, teeth, tongue, pharynx, larynx, vocal cords, or trachea. Other complications include esophageal intubation, mainstem bronchial intubation, aspiration, hypoxemia, hypercapnia, bradycardia, cardiac arrest, pneumothorax, and hemodynamic collapse.

Post-intubation deterioration may occur because of tube misplacement, tube obstruction, bronchospasm, secretions, ventilator disconnection, inadequate ventilator settings, worsening lung disease, or medication effects. Positive-pressure ventilation can reduce venous return and lower blood pressure, especially in hypovolemic or shock states.

Note: Because of these risks, RSI requires continuous monitoring and rapid troubleshooting. The team must be prepared to recognize problems quickly and respond immediately.

Key Takeaways

For respiratory therapy students, RSI is a high-yield airway-management topic. It is commonly associated with conscious, nonfasted patients who are at high risk for aspiration and need urgent intubation. It may also be used in selected emergency situations such as traumatic brain injury, difficult airway management, epiglottitis, tetanus, inhalation injury, and severe carbon monoxide poisoning.

The major steps include airway assessment, preparation, preoxygenation, medication administration, cricoid pressure when appropriate, intubation, tube confirmation, and post-intubation stabilization.

Important medication points include remembering that etomidate is a common induction agent, succinylcholine is a common paralytic, and rocuronium may be used as an alternative. Succinylcholine should be avoided in patients with contraindications such as malignant hyperthermia risk, hyperkalemia, penetrating eye injury, certain chronic muscular disorders, and severe burns or crush injuries several days old.

The most important safety concept is that paralytics do not sedate or relieve pain. Sedation and analgesia must be addressed appropriately.

Another key exam point is the difference between RSI and crash airway management. RSI is a controlled medication-assisted approach. A crash airway requires immediate ventilation and intubation when the patient is unconscious, apneic, or near arrest.

Rapid Sequence Intubation Practice Questions

1. What is rapid sequence intubation?
Rapid sequence intubation is an urgent airway-management procedure that uses medications to quickly produce unconsciousness and, when needed, paralysis so an endotracheal tube can be placed under controlled conditions.

2. What is the primary purpose of rapid sequence intubation?
The primary purpose of rapid sequence intubation is to rapidly secure the airway while supporting oxygenation, ventilation, and protection from aspiration.

3. Why is RSI considered a controlled airway procedure rather than simply fast intubation?
RSI is considered controlled because it includes preparation, preoxygenation, medication administration, intubation, tube confirmation, and post-intubation stabilization.

4. When is rapid sequence intubation commonly indicated?
RSI is commonly indicated when a patient cannot protect the airway, cannot ventilate adequately, cannot oxygenate adequately, or is clinically deteriorating.

5. What are some specific indications for RSI discussed in the original information?
Specific indications include airway obstruction, severe brain injury, severe hypoxemia, abnormal respiratory frequency, hemodynamic instability, and high aspiration risk.

6. Why may RSI be preferred for a conscious patient who has not fasted?
RSI may be preferred because the patient is at increased risk for regurgitation and aspiration, and RSI allows rapid tube placement while minimizing prolonged manual ventilation.

7. What is the goal of avoiding unnecessary manual ventilation during RSI?
The goal is to reduce gastric insufflation, which can increase the risk of regurgitation and aspiration.

8. Why is preoxygenation important before RSI?
Preoxygenation increases the oxygen reserve in the lungs and helps delay oxygen desaturation during the period of apnea.

9. What oxygen concentration is commonly used during preoxygenation for RSI?
Preoxygenation is commonly performed with 100% oxygen.

10. What does the RSI algorithm begin with in the textbook information provided?
The RSI algorithm begins with ABCs, meaning assessment and support of airway, breathing, and circulation.

11. What monitoring device should be used continuously during RSI to assess oxygen saturation?
Pulse oximetry should be used to monitor oxygen saturation continuously.

12. Why must equipment be prepared before RSI medications are administered?
Equipment must be prepared because sedatives and paralytics can rapidly remove the patient’s ability to breathe spontaneously.

13. What equipment should be available before RSI?
Equipment should include oxygen, suction, a bag-valve-mask device, cardiac monitor, pulse oximeter, IV access, laryngoscope, endotracheal tube, stylet, capnography, ACLS drugs, and backup airway equipment.

14. Why should a cricothyrotomy tray be available during RSI?
A cricothyrotomy tray should be available in case intubation fails and the patient cannot be ventilated by other means.

15. What is a “cannot intubate, cannot ventilate” situation?
It is an airway emergency in which the provider cannot place an endotracheal tube and cannot provide effective ventilation by bag-mask or another airway device.

16. What role does the respiratory therapist play before RSI?
The respiratory therapist may help prepare airway equipment, set up suction, assist with preoxygenation, check the endotracheal tube cuff, prepare ventilation equipment, and monitor the patient.

17. What induction medication is commonly associated with RSI in the original information?
Etomidate is commonly associated with RSI as a sedative or induction medication.

18. What is a commonly referenced adult dose of etomidate for RSI?
A commonly referenced adult dose is 20 mg IV or 0.3 mg/kg IV given over 30 to 60 seconds.

19. What paralytic medication is commonly associated with RSI?
Succinylcholine is a commonly used paralytic medication for RSI.

20. What is a commonly referenced adult dose of succinylcholine for RSI?
A commonly referenced adult dose is 100 mg IV or 1 to 1.5 mg/kg IV.

21. What is the approximate onset time of etomidate and succinylcholine?
Both etomidate and succinylcholine have a rapid onset of about 60 seconds.

22. Why is the rapid onset of RSI medications important?
The rapid onset means the clinician must be ready to intubate immediately after medication administration.

23. What medication may be used as an alternative neuromuscular blocker to succinylcholine?
Rocuronium may be used as a nondepolarizing neuromuscular blocker during RSI.

24. Why must succinylcholine contraindications be reviewed before administration?
Contraindications must be reviewed because succinylcholine can cause serious complications in certain patients, such as severe hyperkalemia or malignant hyperthermia.

25. What are some contraindications to succinylcholine mentioned in the original information?
Contraindications include family history of malignant hyperthermia, penetrating eye injury, severe burns or crush injuries that are 2 to 5 days old, hyperkalemia, and chronic muscular conditions such as muscular dystrophy.

26. What does cricoid pressure attempt to reduce during RSI?
Cricoid pressure attempts to reduce passive regurgitation and aspiration by compressing the esophagus during intubation.

27. What is another name for cricoid pressure?
Cricoid pressure is also known as Sellick’s maneuver.

28. Why must cricoid pressure be applied carefully?
Cricoid pressure must be applied carefully because excessive pressure can distort or obstruct the airway and make intubation or ventilation more difficult.

29. What should be done if cricoid pressure interferes with ventilation or intubation?
If cricoid pressure interferes with ventilation or intubation, it may need to be adjusted or released based on the clinical situation.

30. What is the most direct way to help prevent esophageal intubation during RSI?
The most direct way is to visualize the endotracheal tube passing through the vocal cords.

31. What should the provider do if the vocal cords cannot be clearly identified?
If the vocal cords cannot be clearly identified, the tube should not be blindly inserted, and another experienced practitioner or alternative airway technique should be considered.

32. Why is esophageal intubation dangerous?
Esophageal intubation is dangerous because ventilation enters the stomach instead of the lungs, which can lead to severe hypoxemia and death if not recognized quickly.

33. What tool may help identify incorrect tube placement?
An esophageal detection device may help identify incorrect tube placement, but its results must be interpreted with the patient’s clinical signs.

34. What clinical findings may help assess endotracheal tube placement immediately after intubation?
Clinical findings include bilateral chest rise, breath sounds over both lungs, absence of gastric sounds, improving oxygen saturation, and overall patient response.

35. Why is capnography important after RSI?
Capnography helps confirm tracheal tube placement by detecting exhaled carbon dioxide and provides ongoing evidence of ventilation.

36. What does a colorimetric CO₂ detector indicate when it changes from purple to tan or yellow?
A change from purple to tan or yellow indicates the presence of exhaled carbon dioxide, which supports tracheal placement of the tube.

37. Why can CO₂ detection be misleading during cardiac arrest?
CO₂ detection can be misleading during cardiac arrest because poor pulmonary blood flow may result in little or no exhaled carbon dioxide despite correct tube placement.

38. Why can CO₂ detection fail to identify right mainstem intubation?
CO₂ detection confirms ventilation but does not show whether the tube is too deep in one main bronchus, so breath sounds and chest x-ray are still needed.

39. What is right mainstem intubation?
Right mainstem intubation occurs when the endotracheal tube is advanced too far and enters the right main bronchus, causing one-lung ventilation.

40. What should be done after successful endotracheal tube placement during RSI?
After successful placement, the tube should be confirmed, secured, cuff pressure checked, insertion depth documented, and the patient connected to appropriate ventilatory support.

41. Why is post-intubation stabilization important after RSI?
Post-intubation stabilization is important because the patient may develop hypoxemia, hypotension, arrhythmias, ventilator problems, or complications from tube placement.

42. What medications may be used after RSI if ongoing sedation or paralysis is needed?
Possible post-RSI medications include sedatives, analgesics, and neuromuscular blockers such as diazepam, fentanyl, and vecuronium.

43. What adult dose of vecuronium was listed in the original information?
The listed adult IV dose of vecuronium was 0.1 mg/kg.

44. What adult dose of diazepam was listed as a possible post-RSI medication?
The listed adult IV dose of diazepam was 5 to 10 mg.

45. What adult dose of fentanyl was listed as a possible post-RSI medication?
The listed adult IV dose of fentanyl was 200 micrograms.

46. Why must sedation and analgesia be considered after RSI?
Sedation and analgesia must be considered because the endotracheal tube and mechanical ventilation can cause pain, anxiety, distress, and ventilator dyssynchrony.

47. Why are paralytics not enough for patient comfort?
Paralytics only stop movement and do not provide unconsciousness, amnesia, or pain relief.

48. What is the danger of giving a paralytic without adequate sedation?
The patient may be unable to move or communicate but may still be awake, aware, or in pain.

49. How does RSI differ from crash airway management?
RSI is a controlled medication-assisted intubation process, while crash airway management involves immediate ventilation and intubation in an unconscious, apneic, or near-arrest patient.

50. Why is RSI generally not used for an unconscious patient requiring immediate crash airway management?
In a crash airway, there may not be time for induction and paralysis, so the priority is immediate manual ventilation and intubation.

51. Why is RSI considered a high-risk procedure?
RSI is high risk because sedatives and paralytics can cause apnea, loss of airway reflexes, hypoxemia, hypotension, and rapid clinical deterioration if the airway is not secured.

52. What must the team confirm before giving a paralytic during RSI?
The team must be confident that the patient can be oxygenated and ventilated, especially if intubation is delayed or unsuccessful.

53. Why is bag-mask ventilation readiness important during RSI?
Bag-mask ventilation readiness is important because the patient may become apneic after medication administration and may need immediate ventilation if intubation fails.

54. What patient condition makes RSI especially important in traumatic brain injury?
RSI is especially important when the patient has a Glasgow Coma Scale score of 8 or less or cannot protect the airway.

55. Why should hypoxemia be avoided in a patient with traumatic brain injury?
Hypoxemia should be avoided because it can reduce oxygen delivery to the brain and worsen secondary brain injury.

56. Why should hypercapnia be avoided in a patient with traumatic brain injury?
Hypercapnia should be avoided because it can increase cerebral blood flow and may worsen intracranial pressure.

57. What medication may be considered during RSI when intracranial pressure is elevated?
Lidocaine may be considered when intracranial pressure is elevated.

58. Why may fentanyl be considered during RSI?
Fentanyl may be considered to reduce the sympathetic response to laryngoscopy and intubation.

59. What should be recommended if oral or nasal intubation cannot be performed because of airway trauma?
A surgical airway, such as cricothyrotomy or tracheotomy, should be recommended.

60. Why is epiglottitis considered a high-risk airway condition?
Epiglottitis is high risk because airway swelling can worsen quickly, and airway manipulation may increase obstruction.

61. Why should procedures be minimized in pediatric epiglottitis?
Procedures should be minimized because agitation or airway stimulation can worsen airway compromise.

62. What type of intubation approach may be recommended for pediatric epiglottitis?
Fiberoptic-assisted nasotracheal intubation under controlled conditions may be recommended.

63. What should be considered if intubation fails in a patient with worsening epiglottitis?
Cricothyroidotomy or emergency tracheotomy should be considered if airway obstruction persists or worsens.

64. Why may RSI be used in patients with tetanus?
RSI may be used because airway manipulation can trigger severe reflex laryngospasm in patients with tetanus.

65. What paralytic was specifically recommended in the tetanus scenario from the original information?
Succinylcholine was specifically recommended in the tetanus scenario.

66. What does RSI show in the context of tetanus?
It shows that RSI is not only used for aspiration risk but may also be used when airway manipulation could provoke dangerous reflex responses.

67. Why may burn patients require early airway control?
Burn patients may require early airway control because airway swelling can worsen over time and make later intubation difficult or impossible.

68. What respiratory problems can occur after inhalation injury?
Inhalation injury can cause airway inflammation, thick secretions, impaired mucociliary clearance, atelectasis, infection risk, and worsening oxygenation.

69. Why may RSI be needed in severe carbon monoxide poisoning?
RSI may be needed when severe carbon monoxide poisoning causes neurologic deterioration, respiratory distress, acidosis, or impaired oxygen delivery.

70. Why can pulse oximetry be misleading in carbon monoxide poisoning?
Pulse oximetry can be misleading because many pulse oximeters cannot distinguish oxyhemoglobin from carboxyhemoglobin.

71. What test is needed to accurately assess oxygen saturation in carbon monoxide poisoning?
Blood gas analysis with co-oximetry is needed to accurately assess oxygen saturation and carboxyhemoglobin levels.

72. Why should 100% oxygen be used during and after intubation for carbon monoxide poisoning?
100% oxygen helps displace carbon monoxide from hemoglobin and improves oxygen delivery.

73. Why may deep sedation and paralysis reduce oxygen demand in critically ill patients?
Deep sedation and paralysis may reduce oxygen consumption by decreasing agitation, muscle activity, and work of breathing.

74. What is the relationship between RSI and invasive mechanical ventilation?
RSI often creates the artificial airway needed for invasive mechanical ventilation through placement of an endotracheal tube.

75. Why does RSI not end when the tube passes through the vocal cords?
RSI does not end there because tube placement must be confirmed, the tube must be secured, ventilation must be started, and the patient must be monitored and stabilized.

76. What should be assessed immediately after RSI medications are given?
The clinician should assess whether the patient has lost consciousness, whether paralysis has occurred if a paralytic was used, and whether the team is ready to proceed with intubation immediately.

77. Why is airway assessment important before RSI?
Airway assessment helps identify possible difficult airway features, such as limited mouth opening, poor positioning, airway trauma, swelling, blood, secretions, or unusual anatomy.

78. What can happen if RSI is attempted without a backup airway plan?
If RSI is attempted without a backup airway plan, the patient may become apneic and hypoxemic if intubation fails and ventilation cannot be maintained.

79. Why should suction be ready before intubation?
Suction should be ready to remove secretions, vomit, blood, or other material that could obstruct the view of the airway or increase aspiration risk.

80. Why should IV access be established before RSI?
IV access is needed to administer induction medications, paralytics, fluids, and emergency medications during the procedure.

81. What is the purpose of preparing advanced cardiovascular life support drugs before RSI?
ACLS drugs should be available because the patient may develop bradycardia, hypotension, arrhythmias, or cardiac arrest during airway management.

82. Why is hemodynamic monitoring important during RSI?
Hemodynamic monitoring is important because sedation, paralysis, hypoxemia, and positive-pressure ventilation can affect heart rate, blood pressure, and overall cardiovascular stability.

83. What is the danger of delaying intubation after induction medications are administered?
Delaying intubation after induction medications can leave the patient sedated or paralyzed without a secured airway, increasing the risk of hypoxemia and respiratory arrest.

84. Why should another experienced practitioner be involved if intubation is difficult?
Another experienced practitioner may improve the chance of successful tube placement and reduce time wasted during repeated unsuccessful attempts.

85. What is the role of a bougie during difficult intubation?
A bougie can be passed through the glottic opening first, allowing the endotracheal tube to be advanced over it into the trachea.

86. How can video laryngoscopy help during RSI?
Video laryngoscopy can improve visualization of the airway and may be useful when difficult intubation is anticipated or direct laryngoscopy is unsuccessful.

87. Why should intubation attempts be time-limited?
Intubation attempts should be time-limited to reduce the risk of oxygen desaturation, bradycardia, aspiration, and cardiac arrest.

88. What should the team do if the patient desaturates during an intubation attempt?
The team should stop the attempt, reoxygenate and ventilate the patient if possible, reassess the airway plan, and prepare for another attempt or an alternative airway.

89. Why is endotracheal tube size important during RSI?
The tube must be appropriately sized to allow effective ventilation, minimize airway trauma, and reduce the risk of excessive leak or resistance.

90. Why should the endotracheal tube cuff be checked before RSI?
The cuff should be checked for leaks to ensure it can seal the airway after placement and help reduce aspiration risk during positive-pressure ventilation.

91. Why is insertion depth documented after intubation?
Insertion depth is documented to help verify tube position, detect migration, and support ongoing reassessment after the tube is secured.

92. What complication can occur if the endotracheal tube is inserted too deeply?
If the tube is inserted too deeply, it may enter a mainstem bronchus, commonly the right main bronchus, leading to one-lung ventilation.

93. What complication can occur if the endotracheal tube is not inserted far enough?
If the tube is not inserted far enough, it may become displaced from the trachea or fail to provide a secure airway.

94. Why should breath sounds be reassessed after the patient is connected to the ventilator?
Breath sounds should be reassessed to help confirm continued tube placement, detect mainstem intubation, and evaluate ventilation of both lungs.

95. Why is cuff pressure important after RSI?
Cuff pressure should be maintained within an appropriate range to help seal the airway while reducing the risk of tracheal injury.

96. What ventilator-related problems may occur after RSI?
Ventilator-related problems may include high airway pressure, low pressure alarms, leaks, inadequate ventilation, inadequate oxygenation, and patient-ventilator asynchrony.

97. Why can positive-pressure ventilation worsen hypotension after RSI?
Positive-pressure ventilation can reduce venous return to the heart, which may lower cardiac output and worsen hypotension in some patients.

98. Why is arterial blood gas analysis sometimes needed after RSI?
An arterial blood gas may be needed to evaluate oxygenation, ventilation, acid-base status, and the effectiveness of ventilator settings.

99. What should be included in documentation after RSI?
Documentation may include tube size, insertion depth, confirmation method, cuff pressure, oxygenation status, ventilator settings, patient response, medications used, and complications.

100. What is the main board-exam takeaway about RSI?
The main takeaway is that RSI is a controlled medication-assisted approach for urgent airway control, especially in patients who need rapid intubation and are at risk for aspiration, but it requires full preparation, tube confirmation, and post-intubation stabilization.

Final Thoughts

Rapid sequence intubation (RSI) is a controlled emergency airway technique used when rapid airway protection, oxygenation, or ventilation is needed. It combines preparation, preoxygenation, medication use, skilled tube placement, confirmation, and post-intubation care.

The procedure can improve intubating conditions and reduce aspiration risk, but it also carries serious dangers if performed without proper planning.

For respiratory therapists, the key responsibilities include preparing equipment, supporting oxygenation, assisting with tube placement confirmation, connecting the patient to appropriate ventilatory support, and monitoring closely for complications. RSI should always be viewed as a complete airway-management process, not just the act of placing a tube.