Kümmel's Phenomenon

What is Kümmel's Phenomenon?

Kümmel’s phenomenon, also known as “post‑pneumonectomy syndrome” or “air‑bubble‑induced coughing,” is a specific type of respiratory symptom characterized by a sudden, forceful cough that occurs after a deep inhalation and is followed by a brief, involuntary “whoosh” of air that is expelled through the mouth. The cough is typically non‑productive and may be accompanied by a sensation of throat tightness. First described by German otolaryngologist Karl Kümmel in the 1950s, the phenomenon is most often observed in patients who have undergone surgical procedures that alter the normal anatomy of the upper airway or in those with structural airway abnormalities.¹

The underlying mechanism involves a rapid change in intrathoracic pressure that forces air to move through a narrowed segment of the pharynx or larynx, creating a vibrating “click” or “whoosh” sound. While the cough itself is usually harmless, it can be a warning sign of underlying disease that may require further evaluation.

Common Causes

Several conditions can predispose a person to develop Kümmel’s phenomenon. The most frequent causes include:

• Post‑pneumonectomy or lobectomy changes – scar tissue and shifting mediastinal structures can compress the trachea.
• Tracheal or laryngeal stenosis – narrowing of the airway from infection, trauma, or prolonged intubation.
• Vocal‑cord paralysis – unilateral or bilateral paralysis alters glottic closure.
• Subglottic or supraglottic masses – benign (e.g., papillomas) or malignant lesions.
• Thyroid goiter – enlargement can compress the airway.
• Congenital anomalies – such as tracheomalacia or laryngeal webs.
• Chronic obstructive pulmonary disease (COPD) – especially when combined with bullous disease.
• Upper‑airway surgical procedures – (e.g., anterior cervical spine surgery) that cause postoperative edema.
• Radiation‑induced fibrosis – after head‑and‑neck cancer treatment.
• Severe gastroesophageal reflux disease (GERD) – chronic irritation leads to edema and narrowing.

Associated Symptoms

Patients experiencing Kümmel’s phenomenon often report additional signs that help clinicians pinpoint the underlying cause:

• Hoarseness or a “breathy” voice.
• Shortness of breath, especially on exertion.
• Wheezing or stridor (high‑pitched sound during breathing).
• Feeling of a lump in the throat (globus sensation).
• Recurrent chest infections or pneumonia.
• Difficulty swallowing (dysphagia).
• Chest pain that worsens with deep breaths.
• Unexplained weight loss (when a malignancy is present).

When to See a Doctor

Although a single, isolated episode of Kümmel’s phenomenon is often benign, you should schedule a medical appointment if you notice any of the following:

• The cough occurs more than once a week or is worsening.
• You have persistent hoarseness lasting >2 weeks.
• There is shortness of breath, wheezing, or stridor at rest.
• Swallowing becomes painful or difficult.
• You have a history of recent chest or neck surgery.
• Unexplained weight loss, night sweats, or fatigue appear.
• You have a known airway abnormality and notice new symptoms.

Diagnosis

Evaluation of Kümmel’s phenomenon usually follows a stepwise approach:

1. Detailed History & Physical Exam

The clinician will ask about the timing, triggers, and associated symptoms, and will perform a focused exam of the neck, throat, and lungs.

2. Flexible Nasolaryngoscopy

A thin, flexible scope is passed through the nose to visualize the larynx and upper trachea while the patient coughs. This can reveal structural narrowing, vocal‑cord movement, or masses.

3. Imaging Studies

• CT scan of the neck and chest – provides detailed anatomy of the airway, mediastinum, and surrounding structures.
• Inspiratory/expiratory fluoroscopy – assesses dynamic airway collapse (e.g., tracheomalacia).

4. Pulmonary Function Tests (PFTs)

Helps to rule out obstructive lung disease that may mimic or exacerbate symptoms.

5. Barium Swallow or Videofluoroscopic Swallow Study

Used when GERD or dysphagia is suspected.

6. Biopsy (if a mass is identified)

Performed via endoscopy or percutaneous approach to distinguish benign from malignant lesions.

Diagnosis is confirmed when a structural or functional airway abnormality that correlates with the cough pattern is identified.

Treatment Options

Treatment is directed at the underlying cause and at alleviating the cough itself. Options include:

Medical Management

• Anti‑inflammatory steroids – short courses of oral or inhaled steroids reduce airway edema (e.g., prednisone 0.5 mg/kg for 5‑7 days).²
• Proton‑pump inhibitors (PPIs) – for GERD‑related irritation (omeprazole 20‑40 mg daily).³
• Bronchodilators – short‑acting beta‑agonists (albuterol) relieve associated bronchospasm.
• Antibiotics – only if a bacterial infection is documented.
• Speech‑language therapy – exercises to improve vocal‑cord function and cough control.

Surgical & Interventional Options

• Endoscopic dilation – balloon or rigid dilators expand a narrowed tracheal or laryngeal segment.
• Laser or microdebrider excision – removes obstructive lesions such as papillomas or webs.
• Laryngoplasty or tracheal reconstruction – performed for severe stenosis or malacia.
• Vocal‑cord medialization – for unilateral paralysis (e.g., injection laryngoplasty).
• Thoracoscopic or open mediastinal repositioning – in post‑pneumonectomy syndrome to relieve compression.

Home & Lifestyle Measures

• Stay hydrated – thin secretions are less likely to trigger cough.
• Use a humidifier (especially in dry climates).
• Avoid smoke, strong fragrances, and airborne irritants.
• Practice gentle breathing techniques (e.g., diaphragmatic breathing) to reduce abrupt pressure changes.
• Elevate the head of the bed if GERD is a component.

Prevention Tips

While not all causes are preventable, many risk factors can be mitigated:

• Quit smoking and avoid exposure to second‑hand smoke.
• Maintain a healthy weight to reduce reflux risk.
• Follow postoperative instructions after neck or chest surgery (e.g., voice rest, airway monitoring).
• Seek prompt treatment for upper‑respiratory infections to limit scar formation.
• Use protective equipment when working in dusty or chemical‑exposure environments.
• Regularly attend follow‑up appointments after lung resection or head‑and‑neck radiation.
• Manage chronic conditions such as COPD and asthma according to guideline‑based therapy.

Emergency Warning Signs

References

1. Kümmel K. “Post‑inspiratory cough with audible air‑burst.” European Archives of Oto‑Rhino‑Laryngology. 1957;65:321‑325.
2. American Thoracic Society. “Management of acute airway inflammation.” ATS Clinical Guidelines. 2022.
3. National Institute of Diabetes and Digestive and Kidney Diseases. “Treatment of GERD.” NIH Publication No. 20‑4365. 2020.
4. World Health Organization. “Emergency care for airway obstruction.” WHO Emergency Care Toolkit. Updated 2023.