COPD, a Black Tongue, and a Lateral Tongue Mass

Correct answer: A. 2 cartridges

• A. Correct. For the medically compromised patient the accepted epinephrine ceiling is 0.04 mg per appointment. Each cartridge of 1:100,000 contains 0.018 mg, so two cartridges deliver 0.036 mg and a third would exceed the limit.
• B. Incorrect. Five cartridges deliver 0.09 mg. This approaches the healthy-adult range but is well beyond a restricted limit.
• C. Incorrect. Four cartridges deliver 0.072 mg, nearly double the restricted ceiling.
• D. Incorrect. Three cartridges deliver 0.054 mg of epinephrine, above the 0.04 mg ceiling applied to medically compromised patients.

Note: Flagged — read this one carefully. The 0.04 mg epinephrine ceiling is defined for significant cardiovascular disease, and COPD alone does not strictly invoke it. This patient is ASA III with hypoxemia and takes a beta-2 agonist, which is why board recalls apply the restricted limit. For a healthy ASA I adult the ceiling is 0.2 mg, roughly 11 cartridges, and the lidocaine dose itself caps out first in practice at about 13 cartridges (500 mg absolute maximum).

Correct answer: A. Stratified squamous non-keratinized epithelium

• A. Correct. Chronic irritation converts pseudostratified ciliated columnar epithelium into stratified squamous epithelium, which resists mechanical and chemical insult far better. The cost is the loss of cilia and mucus-secreting goblet cells, crippling mucociliary clearance and predisposing to infection and to squamous cell carcinoma.
• B. Incorrect. Transitional epithelium (urothelium) is confined to the urinary tract, where it accommodates distension. It does not arise in the airway.
• C. Incorrect. Simple squamous epithelium forms the alveolar lining and vascular endothelium. A single flat cell layer would provide less protection, not more.
• D. Incorrect. Simple cuboidal epithelium lines the terminal bronchioles and renal tubules. It offers no protective advantage against smoke and is not the metaplastic endpoint.

Note: Metaplasia is by definition reversible — it regresses if the stimulus is removed. It is nonetheless a warning sign, since persistent irritation drives progression to dysplasia and then carcinoma.

Correct answer: A. Decreased respiratory drive with reduced rate and tidal volume

• A. Correct. Arterial carbon dioxide is the primary stimulus to the central chemoreceptors of the medulla. When it falls, that drive is withdrawn and ventilation is suppressed — which is exactly why breathing into a paper bag, allowing carbon dioxide to be rebreathed, relieves the symptoms of acute hyperventilation.
• B. Incorrect. This inverts the physiology. Rising carbon dioxide increases ventilation; falling carbon dioxide decreases it.
• C. Incorrect. Losing carbon dioxide removes acid from the blood, producing respiratory alkalosis. Retaining carbon dioxide would cause acidosis.
• D. Incorrect. Hypocapnia causes cerebral vasoconstriction and reduced cerebral blood flow. That is the mechanism behind the lightheadedness and perioral tingling of a hyperventilating patient.

Note: Correction to source. The original recall recorded “increased tidal volume,” which is physiologically backwards. This same error was identified and corrected in an earlier file in the series. Special caution in COPD: some patients with chronic carbon dioxide retention rely on hypoxic drive, so high-flow oxygen requires care.

Correct answer: D. Mechanical debridement of the dorsal tongue with tobacco cessation counseling

• A. Incorrect. This is a benign, entirely reversible condition of papillary elongation. Surgery has no role.
• B. Incorrect. Candida may colonize the elongated papillae secondarily, but it is not the cause. Antifungal therapy alone will not resolve the condition.
• C. Incorrect. Black hairy tongue is not inflammatory or immune-mediated, so corticosteroids offer no benefit.
• D. Correct. Black hairy tongue reflects failure of normal desquamation of the filiform papillae, with pigment from tobacco, coffee, and chromogenic bacteria. Gently brushing or scraping the dorsum restores normal turnover, and removing the causative agents — tobacco chiefly, and here also chlorhexidine — prevents recurrence.

Note: Debridement is the correct first-line management; an essential-oil or other antiseptic rinse is at best an adjunct. Common precipitants: tobacco, coffee and tea, chlorhexidine, oxidizing rinses, antibiotics, and xerostomia.

Correct answer: A. Nicotinic stomatitis

• A. Correct — this is the exception. Nicotinic stomatitis is a diffuse white change of the hard palate with red inflamed minor salivary duct openings, caused by heat rather than by the chemical constituents of tobacco. It is confined to the palate and never presents as a discrete tongue nodule.
• B. Incorrect — this belongs in the differential. Schwannoma is a benign nerve sheath tumor that presents as a firm, well-circumscribed, slow-growing submucosal nodule, with the tongue its most common intraoral site.
• C. Incorrect — this belongs in the differential. Traumatic fibroma is the most common reactive soft tissue nodule of the oral cavity and readily occurs on the lateral tongue where it is caught between the teeth.
• D. Incorrect — this belongs in the differential. Granular cell tumor is a benign lesion of Schwann cell origin with a strong predilection for the dorsal and lateral tongue, and is classically associated with pseudoepitheliomatous hyperplasia of the overlying epithelium.

Note: Do not lose sight of the clinical priority. In a 40 pack-year smoker, any persistent enlarging mass on the lateral or ventral tongue — the highest-risk intraoral site — must be biopsied to exclude squamous cell carcinoma, whatever the benign possibilities.

Correct answer: A. Incisional biopsy

• A. Correct. For a lesion of this size, in a high-risk site, in a high-risk patient, an incisional biopsy establishes the diagnosis before any definitive surgery is planned. Include representative lesional tissue together with the adjacent margin, and sample the most clinically suspicious area.
• B. Incorrect. Fine-needle aspiration is valuable for deep masses and lymph nodes, but it does not preserve tissue architecture and is not the standard for an accessible mucosal lesion.
• C. Incorrect. Excisional biopsy is appropriate for small lesions, generally under about 1 cm, that can be removed completely with a margin. Excising this lesion before diagnosis risks an inadequate margin if it proves malignant.
• D. Incorrect. Exfoliative cytology samples only surface cells and cannot assess whether invasion through the basement membrane has occurred. It is a screening adjunct, never definitive for a submucosal mass.