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Infectious Diseases

Acute Sinusitis

Acute rhinosinusitis is usually viral; identify the clinical patterns that increase the likelihood of bacterial disease, reserve imaging for complications or alternative diagnoses, and use watchful waiting or targeted antibiotics with defined reassessment and escalation thresholds.

Clinical question: How should clinicians distinguish uncomplicated viral from bacterial acute rhinosinusitis and select observation, antibiotics, imaging, or urgent referral?

First decision

Identify orbital, intracranial, and invasive disease before outpatient treatment

Escalate promptly when examination or host factors suggest disease beyond uncomplicated mucosal infection.

Do not manage as routine outpatient acute sinusitis when there is altered mental status, suspected meningitis or intracranial abscess, orbital cellulitis, intraorbital abscess, or cavernous sinus thrombosis. Persistent fever greater than 39°C is also a severe feature requiring reassessment for complicated disease. Arrange urgent specialty evaluation when these findings are present. ccjmTroponins in acute coronary syndrome Alcohol and ...

Treat acute invasive fungal paranasal sinusitis as a surgical and systemic antifungal emergency in severely immunocompromised patients. IDSA recommends surgical debridement plus systemic antifungal therapy; voriconazole is preferred, with a lipid formulation of amphotericin B as an alternative. Debridement may need to be repeated, and extensive surgery is best deferred until thrombocytopenia resolves when feasible because postoperative hemorrhage risk is increased. IDSAAspergillosis

Refer patients with immunocompromise, obstructive anatomic defects, recurrent sinusitis, suspected fungal sinusitis, or suspected neoplasm for specialist assessment rather than repeated empiric outpatient antibiotic courses. ccjmTroponins in acute coronary syndrome Alcohol and ...

Clinical findings that redirect acute sinusitis from routine outpatient care. ccjmTroponins in acute coronary syndrome Alcohol and ...IDSAAspergillosis
Finding or contextMost consequential concernNext action
Altered mental status or suspected meningitis/intracranial abscess ccjmTroponins in acute coronary syndrome Alcohol and ...Intracranial complication ccjmTroponins in acute coronary syndrome Alcohol and ...Urgent specialty-directed evaluation. ccjmTroponins in acute coronary syndrome Alcohol and ...
Orbital cellulitis, intraorbital abscess, or cavernous sinus thrombosis suspected ccjmTroponins in acute coronary syndrome Alcohol and ...Orbital or cavernous sinus complication ccjmTroponins in acute coronary syndrome Alcohol and ...Urgent specialty-directed evaluation. ccjmTroponins in acute coronary syndrome Alcohol and ...
Severely immunocompromised patient with acute sinusitis IDSAAspergillosisAcute invasive fungal paranasal sinusitis IDSAAspergillosisUrgent surgical debridement plus systemic voriconazole or lipid amphotericin B. IDSAAspergillosis
Proptosis or possible orbit/brain extension IDSAAspergillosisChronic invasive or granulomatous aspergillosis; invasive extension IDSAAspergillosisSpecialist-directed diagnostic and surgical management with systemic antifungal therapy. IDSAAspergillosis

Diagnosis

Use illness trajectory rather than isolated symptoms to diagnose bacterial disease

Most cases are viral, and purulence or facial pressure alone does not establish a bacterial infection.

Acute bacterial rhinosinusitis is a clinical diagnosis. Use one of three patterns: persistent nasal discharge or daytime cough for more than 10 days without improvement; severe illness for more than 3-4 consecutive days with fever at least 39°C and purulent nasal discharge or facial pain; or worsening/new fever, daytime cough, or nasal discharge after initial improvement from a viral URI lasting 5-6 days. CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...Wolters KluwerHighlights From the Infectious Diseases Society... : Infectious Diseases in Clinical Practice

The decision threshold should account for the natural history of viral illness: uncomplicated viral URIs generally peak around days 3-6 and are resolving by approximately days 5-7, although residual symptoms can extend beyond 10 days. A nonresolving course, rather than duration alone, supports bacterial disease. acepIt’s Not Just the Sniffles: Approach to Diagnosis and Management of Sinusitis in the Pediatric Population | Pediatric Emergency Medicine

Overall clinician impression and dental pain are among the clinical findings most suggestive of acute bacterial rhinosinusitis; overall clinical impression has a positive likelihood ratio of 3.9. Use these findings to refine probability, but retain the trajectory-based criteria before committing to antibacterial treatment. Wolters KluwerWhat are the most useful clinical findings for diagnosing ...

Trajectory-based approach to acute rhinosinusitis. CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...Wolters KluwerHighlights From the Infectious Diseases Society... : Infectious Diseases in Clinical PracticeacepIt’s Not Just the Sniffles: Approach to Diagnosis and Management of Sinusitis in the Pediatric Population | Pediatric Emergency Medicine
Clinical trajectoryInterpretationManagement implication
Symptoms peak at days 3-6 and are improving acepIt’s Not Just the Sniffles: Approach to Diagnosis and Management of Sinusitis in the Pediatric Population | Pediatric Emergency MedicineTypical uncomplicated viral URI pattern acepIt’s Not Just the Sniffles: Approach to Diagnosis and Management of Sinusitis in the Pediatric Population | Pediatric Emergency MedicineProvide symptomatic management; do not diagnose bacterial sinusitis solely from nasal symptoms. acepIt’s Not Just the Sniffles: Approach to Diagnosis and Management of Sinusitis in the Pediatric Population | Pediatric Emergency MedicineCDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...
Symptoms persist >10 days without improvement CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...Wolters KluwerHighlights From the Infectious Diseases Society... : Infectious Diseases in Clinical PracticeClinical acute bacterial rhinosinusitis pattern CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...Wolters KluwerHighlights From the Infectious Diseases Society... : Infectious Diseases in Clinical PracticeOffer watchful waiting if reliable follow-up is available or initiate first-line antibiotic therapy. CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...ccjmRhinosinusitis and the role of imaging | Cleveland Clinic Journal of medicine
Fever ≥39°C plus purulent discharge or facial pain for >3-4 days CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...Wolters KluwerHighlights From the Infectious Diseases Society... : Infectious Diseases in Clinical PracticeSevere bacterial pattern CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...Wolters KluwerHighlights From the Infectious Diseases Society... : Infectious Diseases in Clinical PracticeTreat as acute bacterial rhinosinusitis and assess for severe or complicated disease. CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...ccjmTroponins in acute coronary syndrome Alcohol and ...
New or worsening symptoms after initial improvement from URI CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...Wolters KluwerHighlights From the Infectious Diseases Society... : Infectious Diseases in Clinical PracticeDouble-worsening bacterial pattern CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...Wolters KluwerHighlights From the Infectious Diseases Society... : Infectious Diseases in Clinical PracticeOffer watchful waiting with reliable follow-up or initiate first-line antibiotic therapy. CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...ccjmRhinosinusitis and the role of imaging | Cleveland Clinic Journal of medicine

Workup

Avoid routine imaging in uncomplicated disease and image when the result changes disposition

Imaging does not distinguish routine viral from bacterial acute rhinosinusitis sufficiently to guide usual outpatient care.

Do not order sinus radiographs routinely for acute rhinosinusitis. Clinical criteria determine whether acute bacterial rhinosinusitis is likely, and routine imaging is not recommended in uncomplicated cases. CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...ccjmRhinosinusitis and the role of imaging | Cleveland Clinic Journal of medicine

Obtain targeted imaging when complications, an alternative diagnosis, or a high-risk process is suspected. CT detects isolated sphenoid sinus disease more consistently than plain films, whereas plain films can miss approximately half of sphenoid sinusitis cases; use this distinction when localizing suspected deep sinus disease rather than relying on routine radiography. WHO::: Pakistan Armed Forces Medical Journal :::

In a patient with persistent or recurrent symptoms, separate acute episodes with complete clinical resolution from chronic rhinosinusitis. Chronic rhinosinusitis persists for at least 12 weeks, while recurrent acute disease is characterized by discrete episodes with symptom-free intervals and normalization between attacks. ScienceDirectAllergic Fungal Sinusitis - an overviewScienceDirectSinus Headache - an overviewWHO::: Pakistan Armed Forces Medical Journal :::

When imaging meaningfully changes management. WHO::: Pakistan Armed Forces Medical Journal :::ccjmTroponins in acute coronary syndrome Alcohol and ...CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...IDSAAspergillosis
Clinical settingImaging approachReason for imaging
Uncomplicated acute rhinosinusitis meeting clinical criteria CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...No routine sinus radiograph. CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...Imaging is not routinely recommended. CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...
Suspected isolated sphenoid sinus disease WHO::: Pakistan Armed Forces Medical Journal :::CT rather than plain film. WHO::: Pakistan Armed Forces Medical Journal :::Plain films may miss about 50% of sphenoid sinusitis; CT consistently detects it. WHO::: Pakistan Armed Forces Medical Journal :::
Ocular, neurologic, or mental-status abnormality ccjmTroponins in acute coronary syndrome Alcohol and ...Urgent complication-directed imaging with specialty involvement. ccjmTroponins in acute coronary syndrome Alcohol and ...Evaluate for orbital, cavernous sinus, or intracranial complications. ccjmTroponins in acute coronary syndrome Alcohol and ...
Severe immunocompromise or suspected invasive fungal disease IDSAAspergillosisUrgent imaging as part of surgical and antifungal planning. IDSAAspergillosisDefine invasive disease and possible orbital or cerebral extension. IDSAAspergillosis

Treatment

Choose observation or antibiotics based on bacterial pattern, severity, and follow-up reliability

Antibiotics offer limited benefit for many clinically diagnosed cases, so observation is a deliberate treatment strategy.

For uncomplicated acute bacterial rhinosinusitis with reliable follow-up, encourage watchful waiting. The American Academy of Otolaryngology-Head and Neck Surgery approach permits either antibiotics or a 7-day observation period, with antibiotics started if symptoms worsen or fail to improve. ccjmRhinosinusitis and the role of imaging | Cleveland Clinic Journal of medicine About 65% of patients thought to have acute bacterial rhinosinusitis who receive placebo improve spontaneously, supporting an observation option when follow-up is dependable. ccjmTroponins in acute coronary syndrome Alcohol and ...

If antibiotic treatment is selected, prescribe amoxicillin or amoxicillin-clavulanate as first-line therapy. IDSA recommends amoxicillin-clavulanate after a clinical diagnosis of acute bacterial rhinosinusitis; clavulanate expands coverage for beta-lactamase-producing Haemophilus influenzae and Moraxella catarrhalis. CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...ccjmRhinosinusitis and the role of imaging | Cleveland Clinic Journal of medicine A cited adult standard-dose regimen is amoxicillin-clavulanate 875 mg/125 mg orally twice daily for 7 days. cdn clinicaltrials[PDF] Clinical trial of the treatment of acute sinusitis with standard-dose vs ...

Avoid macrolides, including azithromycin, because Streptococcus pneumoniae resistance is approximately 40%. For penicillin-allergic adults, doxycycline or a respiratory fluoroquinolone, levofloxacin or moxifloxacin, are listed alternatives. CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ... Reassess symptoms within 48-72 hours after starting amoxicillin-clavulanate; failure to improve should trigger diagnostic reassessment and an antibiotic change rather than simply extending the same regimen. ccjmRhinosinusitis and the role of imaging | Cleveland Clinic Journal of medicine

Antibiotic selection and reassessment for clinically diagnosed acute bacterial rhinosinusitis. ccjmRhinosinusitis and the role of imaging | Cleveland Clinic Journal of medicinecdn clinicaltrials[PDF] Clinical trial of the treatment of acute sinusitis with standard-dose vs ...CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...
SituationActionTiming or caution
Uncomplicated bacterial pattern with reliable follow-up CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...ccjmRhinosinusitis and the role of imaging | Cleveland Clinic Journal of medicineWatchful waiting or first-line antibiotic therapy. CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...ccjmRhinosinusitis and the role of imaging | Cleveland Clinic Journal of medicineIf observing, start antibiotics for worsening or failure to improve during 7 days. ccjmRhinosinusitis and the role of imaging | Cleveland Clinic Journal of medicine
First-line treatment selected CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...ccjmRhinosinusitis and the role of imaging | Cleveland Clinic Journal of medicineAmoxicillin or amoxicillin-clavulanate; cited adult regimen: 875/125 mg orally twice daily for 7 days. CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...cdn clinicaltrials[PDF] Clinical trial of the treatment of acute sinusitis with standard-dose vs ...Monitor response within 48-72 hours. ccjmRhinosinusitis and the role of imaging | Cleveland Clinic Journal of medicine
Penicillin allergy CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...Doxycycline, levofloxacin, or moxifloxacin. CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...Avoid macrolides because pneumococcal resistance is approximately 40%. CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...
No improvement after amoxicillin-clavulanate ccjmRhinosinusitis and the role of imaging | Cleveland Clinic Journal of medicineChange to high-dose amoxicillin-clavulanate, doxycycline, respiratory fluoroquinolone, or clindamycin plus a third-generation oral cephalosporin. ccjmRhinosinusitis and the role of imaging | Cleveland Clinic Journal of medicineReassess diagnosis and evaluate for alternate or complicated disease. ccjmRhinosinusitis and the role of imaging | Cleveland Clinic Journal of medicineccjmTroponins in acute coronary syndrome Alcohol and ...

Treatment failure after initial antibiotics

When an adult treated with amoxicillin-clavulanate does not improve at reassessment, change therapy to high-dose amoxicillin-clavulanate, doxycycline, a respiratory fluoroquinolone such as levofloxacin or moxifloxacin, or clindamycin plus a third-generation oral cephalosporin. At the same visit, reconsider an alternative diagnosis, obstructive anatomy, recurrent disease, fungal disease, or neoplasm, particularly if symptoms are atypical or recurrent. ccjmRhinosinusitis and the role of imaging | Cleveland Clinic Journal of medicineccjmTroponins in acute coronary syndrome Alcohol and ...

Adjuncts

Use local symptom therapies selectively and recognize fungal phenotypes

Adjunctive treatment should not obscure deterioration or substitute for escalation in high-risk disease.

For acute bacterial rhinosinusitis, use nasal saline irrigation and intranasal glucocorticoids as adjuncts. IDSA does not recommend decongestants or antihistamines as adjunctive treatment for acute bacterial rhinosinusitis. ccjmRhinosinusitis and the role of imaging | Cleveland Clinic Journal of medicine Analgesics, including acetaminophen and nonsteroidal anti-inflammatory drugs, are symptomatic options during observation or alongside antibacterial therapy. ccjmRhinosinusitis and the role of imaging | Cleveland Clinic Journal of medicine

Consider allergic fungal rhinosinusitis in chronic rather than routine acute presentations with nasal polyposis and characteristic eosinophilic mucin containing fungal hyphae. Fungal culture of nasal secretions is usually unhelpful because it commonly reflects airborne fungi rather than the causative process. Allergic fungal rhinosinusitis can produce ophthalmic involvement, bony erosion, or cavernous venous thrombosis, which should prompt specialty-directed evaluation. IDSAAspergillosis

Do not treat a chronic symptom pattern as repeated acute bacterial sinusitis. Chronic rhinosinusitis has evidence supporting saline lavage and intranasal steroids; this is a separate management pathway from short-course antibacterial treatment for acute bacterial disease. jacionlineChronic rhinosinusitis: Epidemiology and medical ...ScienceDirectBacterial Sinusitis - an overview

Distinguishing acute bacterial, chronic inflammatory, and fungal rhinosinusitis pathways. ScienceDirectBacterial Sinusitis - an overviewjacionlineChronic rhinosinusitis: Epidemiology and medical ...IDSAAspergillosis
PatternDiscriminatorNext step
Acute bacterial rhinosinusitis CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...Persistent >10 days without improvement, severe fever/purulence/facial pain pattern, or double worsening. CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...Observation with reliable follow-up or first-line amoxicillin/amoxicillin-clavulanate. CDCOutpatient Clinical Care for Adults | Antibiotic Prescribing ...ccjmRhinosinusitis and the role of imaging | Cleveland Clinic Journal of medicine
Chronic rhinosinusitis ScienceDirectBacterial Sinusitis - an overviewjacionlineChronic rhinosinusitis: Epidemiology and medical ...Symptoms persist at least 12 weeks. ScienceDirectBacterial Sinusitis - an overviewUse chronic-rhinosinusitis evaluation and medical management; saline lavage and intranasal steroids have the highest level of evidence among cited treatments. jacionlineChronic rhinosinusitis: Epidemiology and medical ...
Allergic fungal rhinosinusitis IDSAAspergillosisNasal polyposis with eosinophilic mucin and fungal hyphae; possible bony or ophthalmic complications. IDSAAspergillosisSpecialty-directed assessment; nasal secretion fungal culture is usually unhelpful. IDSAAspergillosis
Acute invasive fungal sinusitis IDSAAspergillosisSevere immunocompromise with acute disease, with possible orbit or brain extension. IDSAAspergillosisUrgent debridement plus systemic voriconazole or lipid amphotericin B. IDSAAspergillosis

References

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