ENT · Infectious Parotitis
The facts most likely to be tested
Staphylococcus aureus is the most common causative pathogen in acute suppurative parotitis.
The classic clinical presentation involves unilateral parotid swelling, erythema, and tenderness exacerbated by mastication.
Purulent discharge from the Stensen duct upon palpation of the parotid gland is the pathognomonic physical exam finding.
Risk factors include dehydration, poor oral hygiene, advanced age, and the use of anticholinergic medications that decrease salivary flow.
Initial diagnostic evaluation is primarily clinical, though ultrasound or CT scan is indicated if an abscess is suspected.
Empiric treatment requires antistaphylococcal antibiotics (e.g., nafcillin, oxacillin, or vancomycin) to cover methicillin-resistant strains.
Supportive care measures include sialagogues (e.g., lemon drops), hydration, and gland massage to promote salivary drainage.
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A 78-year-old nursing home resident is brought to the emergency department due to worsening right-sided facial pain and swelling. The patient has been bedbound following a recent hip fracture and is currently taking oxybutynin for urinary incontinence. Physical examination reveals a firm, erythematous, and tender mass in the right preauricular region. Gentle pressure on the area results in the expression of thick, purulent material from the Stensen duct into the oral cavity. The patient is febrile at 101.2°F.
What is the most appropriate initial management for this patient?
Intravenous antistaphylococcal antibiotics and hydration
The patient presents with classic signs of suppurative parotitis (unilateral swelling, purulent Stensen duct discharge), which is most commonly caused by S. aureus; treatment requires systemic antibiotics and supportive measures to restore salivary flow.
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Etiology / Epidemiology
Occurs primarily in elderly, dehydrated, or postoperative patients. Staphylococcus aureus is the most common pathogen.
Clinical Manifestations
Presents with unilateral parotid swelling, tenderness, and purulent discharge from Stensen's duct.
Diagnosis
Clinical diagnosis confirmed by CT scan with contrast to evaluate for abscess formation.
Treatment
Initial management includes IV Nafcillin plus Metronidazole; avoid delayed surgical drainage.
Prognosis
High risk of sepsis and deep neck space infection if not treated promptly.
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Epidemiology & Etiology
Predominantly affects the elderly and those with xerostomia or poor oral hygiene. Reduced salivary flow leads to retrograde bacterial migration. Staphylococcus aureus accounts for the vast majority of cases.
Pertinent Anatomy
The parotid gland drains via Stensen's duct into the oral cavity near the second maxillary molar. Inflammation causes significant tension due to the rigid parotid fascia.
Pathophysiology
Decreased salivary flow (hyposecretion) allows oral flora to ascend the ductal system. Stasis promotes bacterial colonization and subsequent infection. The confined space of the gland leads to rapid pressure buildup and potential tissue necrosis.
Clinical Manifestations
Patients present with acute, painful swelling of the parotid gland, often accompanied by trismus. A pathognomonic finding is the expression of purulent saliva from the Stensen's duct upon gland massage. Red flags include high fever, rigors, and signs of airway compromise.
Diagnosis
Diagnosis is primarily clinical. CT scan with contrast is the gold standard to differentiate between simple cellulitis and a drainable abscess. Ultrasound may be used as a bedside alternative to identify fluid collections.
Treatment
Empiric therapy requires IV Nafcillin or Oxacillin to cover methicillin-sensitive *S. aureus*. If MRSA is suspected, use Vancomycin. Do not delay surgical consultation if an abscess is identified, as drainage is required for source control.
Prognosis
Most patients recover with prompt antibiotics. Deep neck space infection and sepsis are the primary life-threatening complications. Patients must be monitored for airway patency due to rapid swelling.
Differential Diagnosis
Sialolithiasis: intermittent pain related to meals
Viral Parotitis: bilateral involvement, mumps history
Sjogren Syndrome: chronic, bilateral, autoimmune
Parotid Neoplasm: painless, slow-growing mass
Actinomycosis: chronic, 'lumpy jaw' with sulfur granules