COPD and reactive airway disease
Stem
A 68-year-old man, 76 kg, with COPD and a 50 pack-year smoking history is scheduled for elective laparoscopic right hemicolectomy. He uses tiotropium and an albuterol inhaler, and over the past week his albuterol use has doubled and his sputum has increased. Today he has scattered expiratory wheeze. Room-air SpO2 is 91%, and an arterial gas shows a PaCO2 of 52 mmHg with a bicarbonate of 31.
Question
Is he ready for surgery, and how will you plan his anesthetic?
Ideal answer
HeadlineNot today: more albuterol, sputum and wheeze mean an exacerbation, and wheezing on the day carries the highest intraoperative bronchospasm risk. I postpone.
- Treated with his physicians: bronchodilators, prednisone 40 mg daily for 5 days, and antibiotics if his sputum is purulent;1 after a viral trigger I wait longer, because airway reactivity stays high for weeks.2
- At baseline: all inhalers continued, bronchodilator before induction, because instrumenting the airway is the strongest trigger and pretreatment blunts it.
- Deep propofol or ketamine induction, sevoflurane maintenance, because a lightly anesthetized airway reacts most, and sevoflurane bronchodilates without irritating.3
- Low rate, long expiration, modest tidal volumes, accepting mild hypercapnia and watching expiratory flow for auto-PEEP. He retains CO2, so I target an SpO2 of 88–92%1 and his own PaCO2.
- Full sugammadex reversal, extubation sitting up, opioid-sparing multimodal analgesia, so he can cough and breathe deeply.
Breaking down the answer
- Optimize or proceed — the examiner is testing judgment about delay. Changes if: the surgery is urgent; it proceeds with aggressive bronchodilation and the same airway plan.
- Steroids — for poorly controlled or newly diagnosed reversible obstruction, oral methylprednisolone 40 mg daily for 5 days before surgery reduces post-intubation wheeze;3 a short course has not been shown to raise wound infection.
- Airway and regional choices — an endotracheal tube is the strongest trigger, so a supraglottic airway or regional technique when surgery allows. Interscalene paralyzes the ipsilateral diaphragm; a high thoracic block weakens accessory muscles. Changes if: FEV1 below about 1 L; diaphragm-sparing approach.
- Dynamic hyperinflation (application of knowledge) — tidal volume 6–8 mL/kg predicted body weight, rate 8–10, I:E 1:3 to 1:4, applied PEEP below the intrinsic level; flow must reach zero before each breath, because air trapping causes barotrauma and hypotension.
- Why his own CO2 — normalizing a chronic retainer's CO2 leaves him alkalotic and causes post-extubation hypoventilation, so his baseline gas sets the target.
- Drugs — ketamine bronchodilates too;3 desflurane irritates the airway. I avoid histamine releasers such as morphine and atracurium; sugammadex avoids the muscarinic airway effects of neostigmine.
- Postoperative plan — regional analgesia, home inhalers restarted in recovery and incentive spirometry, because pulmonary complications here come from atelectasis, retained secretions and hypoventilation.
Follow-up question
He returns three weeks later at baseline and the case proceeds. Twenty minutes in, the blood pressure falls to 70/40, the peak pressure is rising, and the expiratory flow never returns to baseline before the next breath. What is happening, and what do you do?
Follow-up answer
HeadlineDynamic hyperinflation: trapped gas raises intrathoracic pressure and cuts venous return. I tell the surgeon I am disconnecting the circuit.
I disconnect for 20–30 seconds and watch the pressure recover, which confirms the diagnosis. Then I reduce the rate and tidal volume, lengthen expiration, give a bronchodilator, and support the pressure with a vasopressor while the trapped gas empties, checking that expiration now finishes before the next breath. If the pressure does not recover with disconnection, or breath sounds are unequal, I look for a pneumothorax, because positive pressure may have ruptured a bulla, and a tension pneumothorax needs decompression, not ventilator changes.
Pitfalls that cost points
- Choosing desflurane for a reactive airway.
- Ventilating at a normal rate and I:E ratio and missing auto-PEEP.
Rapid-fire
Q: Why are FEV1 and FEV1/FVC the key numbers? A: A post-bronchodilator FEV1/FVC below 0.70 defines obstruction, and FEV1 percent predicted grades severity from GOLD 1 (≥80%) to GOLD 4 (<30%) and predicts postoperative pulmonary risk.4
Q: Why does ketamine help? A: It releases catecholamines and relaxes bronchial smooth muscle, so it is a good induction agent in active wheeze.
Q: How long after a respiratory infection should a reactive airway patient wait? A: At least 2–4 weeks after symptoms resolve, and ideally longer, because airway hyperreactivity can persist for 6 weeks or more.2
Q: Why measure an arterial gas preoperatively? A: It sets the baseline CO2 and bicarbonate, which tell me the target for ventilation and extubation.
Numbers to know
| Item | Value |
|---|---|
| Obstruction | Post-bronchodilator FEV1/FVC <0.704 |
| Target SpO2 in CO2 retainer | 88–92%1 |
| I:E ratio | 1:3 to 1:4 |
| Tidal volume | 6–8 mL/kg PBW |
| Delay after URI in reactive airway | ≥2–4 weeks after symptoms resolve; hyperreactivity up to 6 weeks2 |
| Preoperative steroid | Methylprednisolone 40 mg PO daily for 5 days3 |
| Exacerbation steroid | Prednisone 40 mg daily for 5 days1 |
Links
- Intraoperative bronchospasm, Preoperative pulmonary evaluation and lung resection criteria, Smoking and the timing of cessation, Postoperative mechanical ventilation and weaning, Ventilator modes, PEEP and IMV vs. pressure control
- Atlas: Monitor atlas: perioperative respiratory events
- GOLD Global Strategy for COPD; GINA Global Strategy for Asthma Management
Sources
- 1.COPD Exacerbations · UCSF Hospital Handbook (citing GOLD) · hospitalhandbook.ucsf.eduPrednisone 40 mg daily for 5 days; SpO2 target 88–92%.
- 2.Perioperative Management of URI (Pediatric Anesthesia Article of the Week 158) · Society for Pediatric Anesthesia, 2023 · pedsanesthesia.org
- 3.Asthma (perioperative management) · NYSORA · nysora.comOral methylprednisolone 40 mg for 5 days preoperatively reduces post-intubation wheeze in poorly controlled reversible obstruction.
- 4.Global Initiative for Chronic Obstructive Lung Disease (GOLD) criteria · GPnotebook (summarizing GOLD 2025 report), 2025 · gpnotebook.com
Facts on this page were checked against these sources on Oct 14, 2026. Guidelines change; confirm doses against current institutional protocols.