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 Table of Contents  
LETTER TO EDITOR
Year : 2016  |  Volume : 3  |  Issue : 2  |  Page : 153-154

Venous air embolism during ventriculoatrial shunt placement!


1 Department of Neuroanaesthesiology, All Institute of Medical Sciences, New Delhi, India
2 Department of Anaesthesiology, All Institute of Medical Sciences, New Delhi, India

Date of Web Publication13-May-2016

Correspondence Address:
Surya K Dube
Department of Neuroanaesthesiology, All India Institute of Medical Sciences, New Delhi
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/2348-0548.182341

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How to cite this article:
Tomer GS, Mitra R, Kumar S, Dube SK. Venous air embolism during ventriculoatrial shunt placement!. J Neuroanaesthesiol Crit Care 2016;3:153-4

How to cite this URL:
Tomer GS, Mitra R, Kumar S, Dube SK. Venous air embolism during ventriculoatrial shunt placement!. J Neuroanaesthesiol Crit Care [serial online] 2016 [cited 2019 Apr 24];3:153-4. Available from: http://www.jnaccjournal.org/text.asp?2016/3/2/153/182341

Sir,

Ventriculoatrial (VA) shunt channel cerebrospinal fluid (CSF) from the ventricle of brain into the right atrium of the heart. It is indicated in conditions where repetitive shunt revisions may be required due to ventriculoperitoneal (VP) shunt obstruction, infection or migration.[1] Shunt occlusion, bacteraemia, cardiac tamponade, cardiac rupture, thromboembolism and intracranial haemorrhage are commonly encountered complications with VA shunts.[2] However, venous air embolism (VAE) is a rare complication of VA shunt procedure. We report a case of intra-operative VAE and its successful management in a 5-year-old child who underwent a VA shunt surgery for hydrocephalus.

A 5-year-old, 11 kg, American Society of Anesthesiologists class I male child was planned for VA shunt placement under general anaesthesia. He was an operated case of occipital encephalocele with obstructive hydrocephalus and had CSF ascites following VP shunt placement. The patient had a stable intra-operative course until the surgeons dissected the subclavian vein. While inserting the shunt catheter into the vein, there was a sudden drop in end-tidal carbon oxide (EtCO2) from 35 to 22 mmHg along with transient hypotension (detected by invasive arterial blood pressure). Careful inspection revealed an open shunt insertion site, as the gauge piece covering the site was displaced.

Immediately, patient's lungs were ventilated with 100% oxygen assuming VAE to be the cause of the event. The surgery was briefly interrupted, and the operative site was covered with saline-soaked gauze pieces. Hypotension was managed with intravenous (IV) fluid and mephentermine (1.5 mg) IV. The EtCO2 returned to normal within next 5 min. Rest of the surgery was uneventful, and after tracheal extubation, the patient was shifted to Neurosurgical Intensive Care Unit.

VAE is the entrainment of air into the venous vasculature from the operative field or other communication with the environment; producing systemic effects.[3] Position of the patient and height of the vein with respect to the right side of the heart determine the rate and volume of air entrainment which ultimately determine morbidity and mortality after VAE.[3] In our case, there was a pressure gradient between the shunt insertion site and right side of heart due to the elevated position of right shoulder leading to entrainment of air through exposed subclavian vein. In VA shunt placement, risk of VAE is maximum when central vein is opened for tube insertion, and children appear to at higher risk of VAE as compared to adults.[4] However, EtCO2 decrement is not specific to VAE, and acute hypotension or pulmonary embolism can also lead to a decrease in EtCO2.[5],[6] There was no predisposing factor for pulmonary embolism, and there was no preceding hypotension before fall in EtCO2 in our patient. Hence, we considered VAE to be the aetiology of the event and managed it.

VAE can occur during VA shunt procedure, especially during the inserting of the shunt into central vein. Meticulous surgical technique and high level of vigilance during insertion of VA shunt are warranted to avoid VAE. In the event of sudden and sustained fall in ETCO2 in VA shunt surgery, VAE should be the first diagnosis and should be managed accordingly.

 
  References Top

1.
Yavuz C, Demirtas S, Caliskan A, Kamasak K, Karahan O, Guclu O, et al. Reasons, procedures, and outcomes in ventriculoatrial shunts: A single-center experience. Surg Neurol Int 2013;4:10.  Back to cited text no. 1
[PUBMED]  Medknow Journal  
2.
Camarata PJ, Haines SJ. Ventriculoatrial shunting. In: Rengachary SS, Wilkins RH, editors. Neurosurgical Operative Atlas. Chicago: The American Association of Neurological Surgeons; 1993. p. 231-9.  Back to cited text no. 2
    
3.
Mirski MA, Lele AV, Fitzsimmons L, Toung TJ. Diagnosis and treatment of vascular air embolism. Anesthesiology 2007;106:164-77.  Back to cited text no. 3
    
4.
Flanagan JP, Gradisar IA, Gross RJ, Kelly TR. Air embolus – A lethal complication of subclavian venipuncture. N Engl J Med 1969;281:488-9.  Back to cited text no. 4
    
5.
Bithal P, Dash HH, Vishnoi N, Chaturvedi A. Venous air embolism: Does the site of embolism influence the hemodynamic changes? Neurol India 2003;51:370-2.  Back to cited text no. 5
[PUBMED]  Medknow Journal  
6.
Hatle L, Rokseth R. The arterial to end-expiratory carbon dioxide tension gradient in acute pulmonary embolism and other cardiopulmonary diseases. Chest 1974;66:352-7.  Back to cited text no. 6
    




 

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