The cost of serial cerebrospinal fluid aspirations between ventricular access device (VAD) and ventriculosubgaleal shunt (VSGS) for treatment of post-hemorrhagic ventricular dilatation (PHVD) in premature infants

Introduction: Ventriculosubgaleal shunts (VSGS) require fewer cerebrospinal (CSF) aspirations than ventricular access devices (VAD) for temporization of post-hemorrhagic ventricular dilatation (PHVD) in preterm infants. Cost of postoperative CSF aspiration has not been quantified. Methods: We reviewed CSF aspiration and laboratory studies obtained in preterm infants with PHVD and VAD at our institution between 2009-2020. Cost per aspiration was calculated for materials, labs, and Medicare fee schedule for ventricular puncture through implanted reservoir. We searched PubMed, Cochrane Library, Embase, CINAHL, and Web of Science for meta-analysis of pooled mean number of CSF aspirations and proportion of patients requiring aspiration. Results: Thirty-five preterm infants with PHVD had VAD placed with 22.2±18.4 aspirations per patient. Labs were obtained after every aspiration per local protocol. Cost per aspiration at our institution was $935.51. Of 269 published studies, 77 reported on VAD, 29 VSGS, and 13 both. Five studies on VAD (including the current study) had a pooled mean of 25.8 aspirations per patient (95%CI:16.7-34.8). One study on VSGS reported a mean of 1.6±1.7 aspirations. 3 studies on VAD (including the current study) had a pooled proportion of 97.4% of patients requiring aspirations (95%CI: 87.9-99.5). Four studies on VSGS had a pooled proportion of 36.5% requiring aspirations (95%CI:26.9-47.2). Frequency of lab draws ranged from weekly to daily. Based on costs at our institution, mean number of aspirations, and proportion of patients requiring aspirations, cost difference ranged between $4,243 to $23,235 per patient and $500,903 to 2.36 million per 100 patients depending on frequency of taps and Medicare locality. Discussion/Conclusion: Lower number of CSF aspirations using VSGS can be associated with considerably lower cost compared to VAD.

Case of penetrating brain injury caused by a ventriculoperitoneal shunting procedure

Brain injury with ventricle puncture is a well-known complication of ventriculoperitoneal (VP) shunting. However, parenchymal injuries caused by a shunt tunneller are rare. Herein, we present a case of penetrating brain injury caused by a shunt tunneller during VP shunting. An 83-year-old woman with brainstem glioma underwent VP shunting to control hydrocephalus due to tumour growth. She underwent brainstem tumour biopsy with a lateral suboccipital approach. After the shunting, CT showed a linear haematoma in the left occipital lobe far from the site of the ventricular puncture. MRI revealed a small contusion in the left cerebellar hemisphere, disconnection of the left tentorial membrane and linear haematoma on a straight line. These facts suggested that the shunt tunneller had penetrated the skull through the craniotomy of the posterior fossa. This is a rare complication of VP shunting, with limited cases reported in the literature.

Challenging diagnosis of chronic cerebral fungal infection: Value of (1→3)-ß-D-glucan and mannan antigen testing in cerebrospinal fluid and of cerebral ventricle puncture

Primary fungal infection of the central nervous system (CNS) is rare but often associated with severe prognosis. Diagnosis is complicated since cerebrospinal fluid (CSF) samples obtained from lumbar puncture usually remain sterile. Testing for fungal antigens in CSF could be a complementary diagnostic tool. We conducted such measurements in CSF from patients with CNS fungal infection and now discuss the usefulness of ventricular puncture. Mannan and (1→3)ß-D-glucan (BDG) testing were retrospectively performed in CSF samples from three patients with proven chronic CNS fungal infection (excluding Cryptococcus), and subsequently compared to 16 controls. Results from lumbar punctures and those from cerebral ventricles were confronted. BDG detection was positive in all the CSF samples (from lumbar and/or ventricular puncture) from the three confirmed cases. In case of Candida infection, mannan antigen measurement was positive in 75% of the CSF samples. In the control group, all antigen detections were negative (n = 15), except for one false positive. Faced with suspected chronic CNS fungal infection, measurement of BDG levels appears to be a complementary diagnostic tool to circumvent the limitations of mycological cultures from lumbar punctures. In the event of negative results, more invasive procedures should be considered, such as ventricular puncture.

Pericardial disease

The most common clinical presentations of pericardial disease are pericarditis, effusion, tamponade, and constriction. With acute pericarditis, the most common proven causes are viral infection or as a complication of myocardial infarction, but a wide range of other conditions including autoimmune rheumatic disorders and tuberculosis need to be considered. With pericardial effusion, acute rapid collection is usually caused by traumatic injury, iatrogenic ventricular puncture, or aortic dissection. Presentation is with pericardial tamponade, which is a condition of haemodynamic instability caused by chamber compression because increased intrapericardial pressure is greater than the filling pressure of the right and left ventricles. Presentation is typically with shortness of breath or circulatory collapse. With pericardial constriction, a stiff pericardium loses its stretching ability to accommodate normal changes in intracardiac pressures. Most patients present with leg or abdominal swelling and dyspnoea.