What is the 3 3 2 LEMON rule?

The 3-3-2 rule is part of the LEMON mnemonic (Look, Evaluate, Mallampati, Obstruction, Neck Mobility) used in medicine to predict if a patient's airway will be difficult to intubate, assessing for adequate space and alignment by checking: 3 fingers between incisors, 3 fingers from chin to hyoid bone, and 2 fingers from the hyoid bone to the thyroid cartilage, with smaller measurements suggesting difficulty.

What is the 3-3-2 rule in LEMON?

The 3-3-2 rule involves measuring 3 different distances in the patient's neck using the clinician's fingers. These measurements aid in predicting the ease or difficulty of intubation. Additional tools such as the LEMON scale and the Mallampati scoring system also play a valuable role in the evaluation of the airway.

What is the mnemonic for the LEMON difficult airway?

1 The mnemonic stands for: L ⫽ Look externally, E⫽Evaluate the 3-3-2 rule, M⫽Mallampati, O⫽Obstruction, N⫽Neck Mobility. This mnemonic has been shown to have limited predictive value in the emergency department (ED)2,3,4 yet it is still a useful cognitive model for approaching airway assessment.

What is the 3-3-2 rule for intubation?

The 3-3-2 rule is a quick bedside assessment for predicting difficult endotracheal intubation, checking if a patient can fit 3 fingers between their incisors (mouth opening), 3 fingers from chin to hyoid bone (hyoid-mental distance), and 2 fingers from hyoid bone to thyroid cartilage (thyrohyoid distance), with each measurement ideally being at least that many fingerbreadths, indicating good space for the laryngoscope and tube to align the oral, pharyngeal, and tracheal axes. Failing these measurements suggests a potentially challenging airway, often prompting use of the LEMON scale or other strategies.
 

What is the 20 30 40 rule for extubation?

The 20-30-40 rule for extubation is a set of pulmonary function guidelines, often used for neuromuscular conditions like Guillain-Barré Syndrome (GBS) or Myasthenia Gravis, suggesting elective intubation if: Vital Capacity (VC) < 20 mL/kg, Maximal Inspiratory Pressure (MIP) < -30 cm H₂O, or Maximal Expiratory Pressure (MEP) < 40 cm H₂O, indicating significant respiratory muscle weakness. While a useful guide for preemptive action, these thresholds aren't absolute predictors, and clinicians monitor for overall respiratory stability alongside these measures.
 

Airway Assessment | Anaesthesia

What are the 7 P's of intubation?

The 7 Ps of intubation provide a checklist for Rapid Sequence Intubation (RSI), a critical airway management technique, focusing on key steps: Preparation, Preoxygenation, Pretreatment, Paralysis with Induction, Positioning (or Protection), Placement (with Proof), and Post-intubation Management, ensuring equipment readiness, optimizing oxygenation, minimizing patient distress, securing the airway, confirming tube placement, and establishing ongoing care for a safer procedure.
 

What is the LEMON criteria for intubation?

LEMON is a difficult airway assessment acronym that can help reduce the chance of unexpectedly encountering a difficult airway when attempting intubation. It includes the following steps: Look externally, Evaluate the 3-3-2 rule, Mallampati score, Obstructed airway, and Neck mobility.

What is the LEMON test?

The Lemon Test was a three-pronged legal standard used by U.S. courts for decades to determine if a government action violated the Establishment Clause of the First Amendment", (prohibiting government establishment of religion), requiring laws to have a secular purpose, a primary effect that neither advances nor inhibits religion, and avoid excessive government entanglement with religion, though the Supreme Court largely abandoned it by 2022", in favor of historical practices. 

What are the signs of airway obstruction?

These include:

• Agitation or fidgeting.
• Bluish color of the skin (cyanosis)
• Changes in consciousness.
• Choking.
• Confusion.
• Difficulty breathing, gasping for air, leading to panic.
• Unconsciousness (lack of responsiveness)
• Wheezing, crowing, whistling, or other unusual breathing noises indicating breathing difficulty.

What are the 4 A's of anesthesia?

These phases can be further divided into the four A's of anesthesia planning: anesthesia, analgesia, autonomic stability, and areflexia. The sequencing of medications and the procedure performed is based on the individual patient's needs and risk factors.

What is the soap mnemonic for intubation?

SOAP ME stands for Suction, Oxygen, Airway Assessment, Pharmacy, Plan, Monitor, and Equipment. It's a systematic approach to ensure providers are adequately prepared and equipped for every intubation.

What does dopes stand for?

A helpful mnemonic is “DOPE,” which stands for displacement or obstruction of the endotracheal tube, pneumothorax, and ventilator or equipment failure. [1] Fentanyl is known to cause hypoxia and chest wall rigidity and benzodiazepines accentuates its effect.

What is the 20 30 40 rule for intubation?

In GB syndrome, elective intubation has been recommended based on 20, 30 and 40 rule (vital capacity <20 ml/kg, maximal inspiratory pressure <30 cm of water and maximum expiratory pressure <40 cm of water).

Which mallampati is most difficult?

The less obstructed these structures are, the lower the Mallampati score. Lower scores (1 and 2) are associated with favourable airway management whereas higher scores (3 and 4) portend elevated risk of more challenging intubation.

How many intubations should I get as an EM resident?

Currently, EM residents are required to perform 35 endotracheal intubations during residency, but the vast majority of residents are intubating at rates 2–4 times higher than these recommendations.

What has replaced the Lemon test?

The U.S. Supreme Court's decision in Kennedy v. Bremerton discarded the Lemon test in favor of a "history and tradition" approach for the Establishment Clause. California courts face questions on whether to adopt the "history and tradition" test or maintain an independent interpretation of the state's Religion Clauses.

What did the Supreme Court rule on Trump's immunity?

The Supreme Court already ruled in Trump v. United States (July 2024), granting President Trump broad criminal immunity for "official acts" taken in office, with absolute immunity for "core" functions (like pardoning or commanding the military) and presumptive immunity for other official duties, meaning the government must prove an act was private to prosecute. While no immunity exists for purely private acts, the ruling significantly delays his trials by sending the distinction between official and unofficial conduct back to lower courts, creating a high bar for prosecution on official conduct, even if corrupt. 

What are the three questions of the Lemon test?

The Lemon Test has three prongs, each a requirement for state action to be deemed constitutional under the establishment clause of the U.S. Constitution: (1) the law must have a secular purpose, (2) the primary effect of the law must not infringe on or promote religion, and (3) the law should not unduly entangle ...

What are the 4 criteria for extubation?

The patient should be able to protect the airway, maintain airway patency, have a strong cough, and have minimal secretions. The four most important things to remember are mental status, oxygenation, ventilation, and expectoration (acronym, MOVE).

What is the biggest predictor of difficult intubation?

The strongest independent predictors of difficult intubation identified by meta-analysis of 35 studies were a combination of Mallampati and thyromental distance.

What is the mnemonic for intubation LEMON?

The familiar mnemonic for predicting a difficult intubation is of course LEMON (look externally, evaluate using the 3-3-2 rule, Mallampati score, obstruction, and neck mobility; some add S for saturation).

What are the four drugs for intubation?

[4] Common sedative agents used during rapid sequence intubation include etomidate, ketamine, and propofol. Commonly used neuromuscular blocking agents include succinylcholine and rocuronium. The effectiveness of induction agents and paralytic drugs varies depending on the clinical situation.

What does RSI stand for in anesthesia?

Rapid sequence intubation (RSI) is a technique used when rapid control of the airway is needed as a precaution for patients who may have risks of pulmonary aspiration.

Do you give etomidate or rocuronium first?

Instead of titrating to effect, RSI involves administration of weight-based doses of an induction agent (eg, ketamine, etomidate) immediately followed by a paralytic agent (eg, rocuronium, succinylcholine) to render the patient unconscious and paralyzed within 1 minute.