Persistent Cough Treatment in Corpus Christi, TX
A cough is among the most common reasons patients seek medical care, and when it persists beyond eight weeks—the clinical definition of a chronic cough—it can be debilitating, socially disruptive, and a source of significant anxiety. Chronic cough is rarely caused by a single condition; in the majority of cases, two or more contributing factors are identified. At Corpus Christi ENT Sinus & Allergy, Dr. Todd M. Weiss conducts a thorough, systematic evaluation to identify the specific causes of a persistent cough and develops a targeted, effective treatment plan.
Defining Chronic Cough
- Acute cough: duration less than three weeks; most commonly caused by a viral upper respiratory infection
- Subacute cough: duration of three to eight weeks; often post-infectious
- Chronic cough: duration greater than eight weeks; warrants comprehensive evaluation
The Most Common Causes of Chronic Cough
Upper Airway Cough Syndrome (Postnasal Drip)
Upper airway cough syndrome (UACS), formerly called postnasal drip syndrome, is the most common cause of chronic cough in adults. Mucus draining from the nasal passages and sinuses down the back of the throat stimulates cough receptors in the larynx and pharynx. Contributing conditions include allergic rhinitis, non-allergic rhinitis, chronic sinusitis, and vasomotor rhinitis. Patients typically report a sensation of mucus draining down the throat, frequent throat clearing, and a nasal quality to the voice.
Gastroesophageal Reflux Disease (GERD) and Laryngopharyngeal Reflux (LPR)
Gastroesophageal reflux disease is the second most common cause of chronic cough. Acid or non-acid reflux irritates the distal esophagus and larynx, triggering a vagally mediated cough reflex. Laryngopharyngeal reflux (LPR), also called silent reflux, refers to reflux that reaches the laryngopharynx without producing classic heartburn symptoms. Patients may present with cough as their primary or sole complaint, along with throat clearing, hoarseness, or a globus sensation (lump in the throat).
Cough-Variant Asthma
In cough-variant asthma, cough is the predominant or sole manifestation of airway hyperreactivity, without overt wheezing or dyspnea. The cough is typically dry, episodic, and worsens at night, with cold air, exercise, or allergen exposure. Diagnosis is confirmed by spirometry with bronchodilator response or a methacholine challenge test.
Eosinophilic Bronchitis
Non-asthmatic eosinophilic bronchitis is characterized by chronic cough and eosinophilic airway inflammation without bronchial hyperreactivity. It responds to inhaled corticosteroid therapy.
ACE Inhibitor-Induced Cough
Angiotensin-converting enzyme (ACE) inhibitors, a class of antihypertensive medications including lisinopril, enalapril, and ramipril, cause a dry, persistent, tickling cough in five to twenty percent of users, regardless of dose. The cough typically begins within weeks of starting the medication and resolves within one to four weeks of discontinuation. Switching to an angiotensin receptor blocker (ARB) eliminates the cough without sacrificing blood pressure control.
Chronic Bronchitis and COPD
Chronic bronchitis, defined as productive cough for at least three months in two consecutive years, is most commonly caused by cigarette smoking. It is a component of chronic obstructive pulmonary disease (COPD) in many patients.
Laryngeal Hypersensitivity (Neuropathic Cough)
In a subset of patients, chronic cough persists despite treatment of all identified contributing conditions. Current evidence supports a neuropathic mechanism in which the afferent limb of the cough reflex arc—the vagal sensory neurons supplying the larynx—becomes sensitized, producing cough in response to stimuli that would not ordinarily trigger it. Neuromodulatory agents (gabapentin, pregabalin, amitriptyline) and behavioral cough suppression therapy have demonstrated efficacy in this population.
Evaluation of Chronic Cough
Dr. Weiss performs a comprehensive history and physical examination with attention to upper airway findings, including nasal endoscopy, laryngoscopy to assess laryngeal mucosal changes consistent with LPR, and assessment of adenopathy. A thorough medication review is conducted. Additional workup may include chest X-ray, pulmonary function testing, pH-impedance monitoring for reflux, allergy testing, and CT imaging of the sinuses or chest when indicated.
Treatment
Treatment is directed at all identified contributing factors simultaneously:
- UACS: nasal corticosteroid spray, saline nasal irrigation, antihistamines, and treatment of underlying sinusitis or allergy
- GERD/LPR: dietary modification, head-of-bed elevation, weight loss, proton pump inhibitor therapy, and H2-receptor antagonists
- Cough-variant asthma: inhaled bronchodilators and inhaled corticosteroids
- ACE inhibitor cough: discontinuation of the offending agent and substitution of an ARB
- Neuropathic cough: neuromodulatory pharmacotherapy and behavioral cough suppression therapy
Schedule an Appointment Today
If a cough has lasted more than eight weeks, an evaluation can identify the cause and the right treatment. Call us at (361) 320-6130 or connect with us online to schedule an appointment.