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Kartagener Syndrome

1. Situs inversus (complete mirror-image reversal of thoracic and abdominal organs)
2. Chronic sinusitis (and/or rhinosinusitis)
3. Bronchiectasis

• K J Lee's Essential Otolaryngology, p. 48
• Scott-Brown's Otorhinolaryngology Head & Neck Surgery Vol. 1, p. 1087

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Genetics and Epidemiology

• Inheritance: Autosomal recessive
• Prevalence: PCD affects approximately 1 in 20,000 individuals at birth; Kartagener syndrome accounts for ~50% of all PCD cases (i.e., those with situs inversus)
• Gene defects: Mutations in genes encoding dynein arm components (e.g., DNAI1, DNAI2, DNAAF1/KTU, DNAAF2, and >50 other PCD-associated genes). No single gene accounts for all cases.
• Histology: A Text and Atlas, p. 784

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Pathophysiology

• The dynein arms are absent (outer, inner, or both) from the A-tubules of peripheral microtubule doublets
• Basal bodies are often misoriented (feet point in random directions rather than a uniform orientation)
• Result: absent or severely reduced ciliary beat frequency and coordination → failure of mucociliary transport

• Histology: A Text and Atlas, pp. 784-787
• Junqueira's Basic Histology, p. 350

Electron Micrograph - Absent Dynein Arms

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Clinical Features

Respiratory Tract

• Recurrent sinusitis / rhinosinusitis - year-round, beginning in infancy
• Nasal polyps - present in ~27% of Kartagener patients
• Bronchiectasis - progressive airway damage from recurrent infections; basal predominant
• Chronic productive cough - from early childhood (<6 months of age)
• Recurrent otitis media - from Eustachian tube ciliary dysfunction
• Neonatal respiratory distress - a common early clue

Reproductive System

• Male infertility (virtually universal) - sperm flagella share the same 9+2 dynein arm structure; immotile flagella = azoospermia/asthenospermia. Spermatogenesis is normal, but the sperm cannot swim.
• Female subfertility - fallopian tube cilia are also impaired. Females may occasionally be fertile if residual ciliary movement is sufficient, but there is an increased risk of ectopic pregnancy due to impaired ovum transport.

CNS

• Hydrocephalus internus (rare) - ependymal cells lining the CSF spaces possess motile cilia; dysfunction may impair CSF circulation through narrow inter-ventricular spaces.

Chest X-Ray and CT Findings

• Murray & Nadel's Textbook of Respiratory Medicine, p. 1596
• Goldman-Cecil Medicine, p. 3739

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Diagnosis

• Unexplained neonatal respiratory distress
• Year-round daily cough beginning before 6 months of age
• Year-round daily rhinosinusitis beginning before 6 months
• Abnormal organ laterality (situs inversus/heterotaxy)

Diagnostic Algorithm (ATS 2018)

• Murray & Nadel's Textbook of Respiratory Medicine, pp. 1596-1597

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Management

• Airway clearance techniques - chest physiotherapy, positive expiratory pressure devices, mucolytics (hypertonic saline); a 2024 systematic review (PMID 39269762) found airway clearance is a mainstay of therapy but evidence on optimal techniques remains limited.
• Antibiotic therapy - prompt treatment of respiratory exacerbations; long-term low-dose macrolides for their anti-inflammatory effects (used similarly to bronchiectasis management).
• Sinus management - endoscopic sinus surgery for refractory sinusitis and polyposis.
• Fertility counseling - for both male (assisted reproduction via ICSI using morphologically normal sperm) and female patients.
• Surveillance - regular pulmonary function tests, CT chest monitoring, hearing assessments (for otitis media sequelae).
• Lung transplantation in end-stage disease.

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Key Summary Table

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Acute Appendicitis

Overview and Epidemiology

• Lifetime risk: 8.6% in males, 6.7% in females
• Peak incidence: Teens and early twenties; equal sex incidence before puberty; male-to-female ratio rises to 3:2 at age 25
• Rare in infants (<5 years); more dangerous due to underdeveloped omentum - inflammation less well-contained, leading to higher perforation rates
• Bailey and Love's Short Practice of Surgery, 28th ed., pp. 1358-1359
• Sleisenger and Fordtran's Gastrointestinal and Liver Disease, p. 172

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Aetiology and Pathophysiology

1. Obstruction - in 50-80% of cases, caused by:
   • Faecolith / appendicolith (most common in adults) - inspissated faecal material, calcium phosphates, bacteria, and epithelial debris
   • Lymphoid hyperplasia (most common in children/young adults)
   • Tumour (e.g. caecal carcinoma - important in middle-aged/elderly)
   • Foreign body, parasites (Enterobius vermicularis)
   • Fibrotic stricture (from previous resolved appendicitis)
2. Consequences of obstruction:
   • Continued mucus secretion raises intraluminal pressure
   • Lymphatic drainage obstructed → oedema and mucosal ulceration
   • Bacterial translocation to the submucosa (mixed aerobic/anaerobic flora; E. coli and Bacteroides fragilis predominate in perforation)
   • Progressive venous obstruction → ischaemia of appendix wall
   • Gangrene → perforation → peritonitis

Note: Progression to perforation is not inevitable - spontaneous resolution is recognised, suggesting uncomplicated and perforated appendicitis may represent different disease processes.

• Schwartz's Principles of Surgery, 11th ed., pp. 1359-1360
• Robbins & Kumar Basic Pathology, p. 587

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Pathology (Morphological Stages)

• Robbins & Kumar Basic Pathology, pp. 587-588

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Clinical Features

Symptoms - Classic Sequence

1. Periumbilical/central colic (visceral pain from appendix - T10 dermatome)
2. Pain migrates to the right iliac fossa (RIF) within 6-8 hours, becomes constant and somatic as parietal peritoneum becomes inflamed
3. Anorexia (very characteristic - nearly universal)
4. Nausea ± vomiting (usually follow onset of pain, not precede it)
5. Low-grade fever 37.2-38.4°C

The classic visceral-to-somatic pain migration is present in only ~50% of patients. Atypical presentations are more common in the elderly, young children, and with malpositioned appendix.

Signs

• Retrocaecal (~65%): Rigidity may be absent ("silent appendix"), deep loin tenderness, psoas spasm causing hip flexion
• Pelvic: No abdominal rigidity; suprapubic pain; diarrhoea; bladder symptoms (frequency); tenesmus; only tender on rectal exam
• Postileal: Pain may not shift; diarrhoea; ill-defined tenderness near umbilicus

Vital signs

• First 6 hours: Often no fever or tachycardia
• After 6 hours: Mild pyrexia 37.2-37.7°C, pulse 80-90 bpm
• High fever (>38.5°C) in a child suggests alternative diagnosis (e.g. mesenteric adenitis)
• High fever + high WBC in adults suggests perforation/abscess
• Bailey and Love's Surgery, pp. 1359-1362
• Schwartz's Principles of Surgery, pp. 1400-1401

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Investigations

Laboratory

Scoring Systems

• Score 5-6: Suggestive → surgical review or imaging
• Score 7-8: Probable appendicitis
• Score 9-10: Almost certainly appendicitis

Imaging

• Sensitivity ~80%, specificity ~90%
• Technique: high-frequency linear transducer with graded compression
• Primary criteria: tubular, blind-ending, non-compressible structure with outer diameter >6 mm
• Additional findings: wall hyperaemia, hyperechoic periappendiceal fat, appendicolith (with posterior acoustic shadowing)

• Sensitivity ~94-98%, specificity ~95%
• Shows: enlarged enhancing appendix, periappendiceal fat stranding, appendicoliths, perforation, abscess
• Rarely necessary in children if USS is adequate

• Grainger & Allison's Diagnostic Radiology, pp. 1801-1802

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Differential Diagnosis

• Loose stools misdiagnosed as gastroenteritis (pelvic appendicitis)
• Pyuria/dysuria misdiagnosed as UTI (appendix adjacent to ureter/bladder)
• Antibiotics masking/mollifying signs and delaying presentation
• RLQ pain from right lower lobe pneumonia (always consider chest exam)
• Bailey and Love's Surgery, p. 1362

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Management

General Resuscitation (all patients)

• IV access, IV fluids, analgesia (opioids are safe and do not mask signs)
• NBM (nil by mouth)
• Broad-spectrum IV antibiotics covering aerobic and anaerobic organisms (e.g. cefuroxime + metronidazole; or co-amoxiclav; or piperacillin-tazobactam for perforated disease)
• Pregnancy test, cross-match if needed

Uncomplicated Appendicitis

• Laparoscopic appendicectomy is now the standard of care
• Advantages over open: less pain, faster recovery, lower wound infection rate, better cosmesis, allows concurrent diagnosis of alternative pathology
• No further antibiotics needed post-operatively for uncomplicated disease

• Multiple RCTs (APPAC, CODA trials) show ~70% of patients with uncomplicated appendicitis can be successfully treated with antibiotics alone in the short term
• ~30% require appendicectomy within 1 year due to recurrence
• Patients with appendicoliths have significantly higher failure rates with antibiotics alone
• The 2024 SAGES guidelines and 2026 WSES Jerusalem Guidelines support offering antibiotics-first as an option for selected patients with uncomplicated appendicitis (shared decision-making)

Complicated Appendicitis

• Septic patient: Immediate surgery (laparoscopic or open), though associated with higher risk of abscesses and enterocutaneous fistulae due to dense adhesions
• Stable patient with abscess/phlegmon: Percutaneous CT-guided drainage + IV antibiotics; interval appendicectomy can be considered at 6-12 weeks (though evidence for mandatory interval appendicectomy is limited)
• Post-operative antibiotics for 3-7 days

• Often managed non-operatively with antibiotics initially
• In children with unobstructed appendix mass, conservative management is appropriate; interval appendicectomy considered 6 weeks later but not mandated

• Routine histology of all appendicectomy specimens - to detect unexpected pathology (carcinoid, carcinoma, Crohn's)
• ~10-20% of appendicectomies find a normal appendix ("negative appendicectomy") - acceptable rate to avoid missed perforation; the 2023 systematic review (PMID 37914953) confirmed imaging integration reduces this rate significantly
• Bailey and Love's Surgery, pp. 1363-1366
• Schwartz's Principles of Surgery, pp. 1401-1405

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Special Populations

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Key Summary

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Recent guidelines update (2026): The WSES Jerusalem Guidelines 2025 (PMID 41604201) published in JAMA Surgery now formally endorse antibiotic-first therapy as a valid alternative to surgery in carefully selected uncomplicated appendicitis, with the caveat that patients with appendicoliths on imaging have substantially higher failure rates and should be offered surgery as first choice.