Aggregatibacter aphrophilus ventriculitis following C1-C2 transarticular screw fixation.

OBJECTIVE: Central nervous system (CNS) infections after cervical spine surgery are a rare but serious complication and may be caused by uncommon pathogens. We report the case of a 57-year-old male who developed slowly progressive mental confusion with headaches, increased daytime sleepiness and mild gait disturbance within the last 3 weeks. Six weeks prior to admission to our department, he underwent an atlantoaxial fusion by C1-C2 transarticular screw fixation for rheumatoid arthritis related C1-C2 multidirectional instability. METHODS: We analyzed clinical and neuroradiological findings. RESULTS: The findings were consistent with communicating hydrocephalus secondary to ventriculitis and the left C1-C2 screw was found to be misplaced with perforation of the dura. The situation was interpreted as implant related surgical site infection of the cerebrospinal fluid followed by ventriculitis and hydrocephalus. Bacterial broad range 16S rRNA gene PCR from the cerebrospinal fluid (CSF) followed by sequencing identified Aggregatibacter aphrophilus as the causative agent, while conventional cultures remained negative due to its fastidious growth. The patient was successfully treated with a lumbar drain and intravenous ceftriaxone. CONCLUSIONS: To our knowledge, this is the first report of Aggregatibacter aphrophilus ventriculitis following C1-C2 transarticular screw fixation.

Pseudomonas aeruginosa meningitis/ventriculitis in a UK tertiary referral hospital.

BACKGROUND: Pseudomonas aeruginosa is a rare cause of meningitis and ventriculitis but is generally associated with significant morbidity and mortality. AIM: We sought to determine the epidemiology, risk factors and outcome of meningitis and ventriculitis due to P. aeruginosa at our institution in order to inform preventive strategies and treatment guidelines. METHODS: Retrospective study of all patients with a positive cerebrospinal fluid (CSF) culture admitted to a tertiary care hospital over 18 years. Clinical details, demographic, microbiological and antibiotic data were obtained from laboratory and medical records. RESULTS: Twenty-four episodes occurred in 21 patients over 18 years. Pyrexia (75%), fluctuating mental status (50%) and headache (41%) were the most frequent presenting symptoms. Nineteen of the 21 patients had previously undergone a neurosurgical procedure and seven had extra-ventricular devices in situ. Twelve (57%) patients had P. aeruginosa isolated from another site prior to their episode. Most (89%) CSF samples demonstrated a neutrophilia; the CSF protein, when measured, was raised in all cases. Gram-negative bacilli were visible on CSF microscopy in only three isolates. There were relatively low rates of resistance to most antimicrobials tested and combination treatment of intravenous with intrathecal antibiotics was often used. No patients died within 28 days. CONCLUSION: Pseudomonas aeruginosa meningitis and ventriculitis are predominantly nosocomial and related to prior neurosurgery. It can be difficult to diagnose as CSF Gram-film and meningism are insensitive markers. Appropriate empirical treatment, neurosurgical prophylaxis and surveillance can aid in managing this infection.

Meningitis related ventriculitis--experience from a tertiary care centre in northern India.

OBJECTIVE: To assess clinical profile and short term outcome of patients with meningitis related ventriculitis. METHODS: Case records of 47 patients admitted with a diagnosis of ventriculitis (complicating meningitis) over 3 y were analysed retrospectively. RESULTS: The mean age of patients was 4.96 mo (20 d - 42 mo). The common symptoms were fever (27/47), enlarging head (23/47) and seizures (12/47) with signs of raised intracranial pressure (29/47). Ventricular cerebro-spinal fluid (CSF) showed mean cells - 237 cells/µL, sugar - 36 mg/dL and protein - 568 mg/dL. Gram stain and/or culture were positive in 5 patients. Ultrasonography of the head (done in 32 of 47 patients) showed hydrocephalus in 29 and internal echoes, debris or septations in ventricles in 5 patients. Computed tomography (CT) of brain (done in 42 of 47 patients) showed hydrocephalus in 36, abscesses in 7, ependymal enhancement in 4, infarcts in 4 and subdural empyema in 3 patients. MRI brain (done in 13 patients) showed hydrocephalus in all, 6 had cysts and 3 had ependymal enhancement. Thirty seven patients were started on ceftriaxone combined with vancomycin/cloxacillin with/without amikacin, and 10 patients received vancomycin and meropenem. Mean duration of antibiotics treatment was 4.17 wk (range; 0.8-12 wk). External ventricular drainage (EVD) was done in 22/47 patients. Cure rate (improvement in clinical and CSF parameters) in patients with external ventricular drainage was 59% as against 50% in patients who received antibiotics alone. At least 19 patients required ventriculoperitoneal (VP) shunt for unresolved significant hydrocephalus by discharge. There were 10 deaths, four of them occurred within first 2 wk of admission, one in 3rd wk and 5 within few months of discharge from hospital. CONCLUSIONS: Ventriculitis associated with meningitis is a difficult to treat infection with significant mortality and morbidity. It requires prolonged administration of antibiotics. External ventricular drainage may improve cure rate and hasten clearing of CSF infection.