2.5 Practice Drills and Readiness Markers

2.5 Respiratory Emergency Management and Readiness

The domain ends where it is most often tested clinically: managing the patient who is working to breathe. Match the treatment to the underlying problem — lower-airway constriction (asthma/COPD) versus alveolar flooding (pulmonary edema) — because the wrong therapy worsens the patient.

Asthma and COPD (bronchospasm)

The mainstays are inhaled bronchodilators and non-invasive ventilation:

The shark-fin capnogram confirms bronchospasm and tracks response. In COPD, titrate oxygen to SpO2 ~88-92% rather than chasing 100%.

Pulmonary edema and the failing airway

Acute cardiogenic pulmonary edema (CHF/flash edema) floods the alveoli. The patient is hypertensive, anxious, with rales/crackles, frothy (sometimes pink) sputum, and JVD. The two pillars are:

• CPAP — pushes fluid out of the alveoli, recruits collapsed lung, and reduces preload and afterload; it frequently reverses the patient and prevents intubation.
• Nitroglycerin — venodilation reduces preload (and at higher doses afterload), unloading the failing left ventricle. Give it when the systolic BP is adequate (commonly >100-110 mmHg); withhold for hypotension, and use caution/avoid with recent phosphodiesterase inhibitors (sildenafil) or suspected right-ventricular MI.

Distinguish this from bronchospasm: pulmonary edema has crackles and a cardiac history; asthma/COPD has wheezing and the shark-fin waveform. Do not give large fluid boluses to a flooded patient.

CPAP cautions and the failing airway

CPAP is contraindicated in apnea, hypoventilation/decreased level of consciousness, hypotension, active vomiting or GI bleed, facial trauma, and suspected pneumothorax. It is a bridge, not a cure — if the patient tires on CPAP, you must escalate.

Recognize the failing airway early: rising or falling respiratory rate toward exhaustion, falling SpO2 despite maximal oxygen and therapy, a rising ETCO2 trend, silent chest (no air movement to wheeze), declining mental status, and the patient who can no longer protect the airway. The response is to assist ventilations with a BVM and move to a definitive airway (SGA or intubation, RSI/DSI per protocol). Do not be falsely reassured by a 'quiet' chest in a severe asthmatic — silence means no air is moving, a peri-arrest sign.

Readiness markers

• Recall every airway-ladder rung and adjunct in order without notes.
• State RSI/DSI doses (etomidate 0.3, ketamine 1-2, succinylcholine 1-1.5, rocuronium 1 mg/kg) and succinylcholine contraindications cold.
• Interpret a capnogram (normal, shark-fin, sudden loss, ROSC) on sight.
• Choose CPAP vs nebulizer vs nitro vs IM epi by underlying pathology, and name when to escalate to intubation.

Differentiating the wheezing patient and worked drills

Wheezing is not synonymous with asthma. A focused drill is to list every cause of a patient who is "wheezing and short of breath" and rehearse the discriminating finding and treatment:

Notice that two of these are airway/breathing emergencies treated with epinephrine or a needle, not a nebulizer — choosing albuterol for an anaphylaxis or pneumothorax stem is a classic miss.

A worked respiratory scenario

Consider a 68-year-old with a CHF history, sitting upright, SpO2 84%, BP 196/110, crackles to the mid-lung fields, and frothy sputum. The deficit is alveolar flooding with a hypertensive, overloaded left ventricle. The correct sequence is high-flow oxygen, then CPAP to recruit alveoli and offload the heart, nitroglycerin because the pressure is high, continuous reassessment of ETCO2 and mental status, and escalation to assisted ventilation/intubation only if the patient tires despite CPAP.

Compare that to a 24-year-old asthmatic with diffuse wheeze and a shark-fin capnogram: continuous albuterol/ipratropium, CPAP, magnesium, and IM epinephrine if the chest goes silent. Same complaint — "trouble breathing" — opposite drug boxes. Building these contrasting drills until the discriminator jumps out is the readiness standard for this domain, because the exam routinely presents two breathless patients and rewards the candidate who treats the underlying physiology rather than the symptom.

Final readiness self-test

Before you consider this domain test-ready, you should be able to reason through a cold scenario without notes: name the airway-ladder rung you would start at and why, predict whether the airway will be difficult using LEMON, state the device you would choose and your backup, recall the RSI drug doses and the contraindications that would change your paralytic, describe how you would confirm and continuously monitor the tube, and interpret a described capnography waveform.

If any of those steps is shaky, return to that subsection rather than re-reading the whole chapter. The strongest predictor of passing this block is being able to convert a stem into the single next action a competent paramedic would take, then justify why the three distractors are unsafe, out of sequence, or aimed at the wrong half of the oxygenation-versus-ventilation problem.