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Intraocular Haemorrhage As a Complication of Pneumoencephalography

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Intraocular Haemorrhage As a Complication of Pneumoencephalography J Neurol Neurosurg Psychiatry: first published as 10.1136/jnnp.39.4.375 on 1 April 1976. Downloaded from Journal ofNeurology, Neurosurgery, and Psychiatry, 1976, 39, 375-380 Intraocular haemorrhage as a complication of pneumoencephalography I. F. MOSELEY AND J. B. PILLING' From the Lysholm Radiological Department, National Hospital for Nervous Diseases, Queen Square, London SYNOPSIS The ocular fundi of 20 patients were examined before and after pneumoencephalo- graphy. In four of these, fresh venous retinal haemorrhages were seen, and a further patient had developed an exudate. Possible reasons for a rise in retinal venous pressure include bodily inverting the patient, compression of the thorax, the use of positive pressure respiration, and the air injection itself. It may be advisable to take steps to limit the effects of such possible causative factors. In 1973, Simon and colleagues published an neuroradiologists or neuro-ophthalmologists account of several cases of intraocular haemor- seem to have encountered individual cases. It Protected by copyright. rhage resulting from air myelography carried out therefore seemed desirable to examine systema- under general anaesthesia. They described three tically a series of patients undergoing pneumo- cases of symptomatic haemorrhage occurring in encephalography in order to detect subclinical an uncontrolled series of 480 gas myelographies, retinal or preretinal haemorrhage, since, if this while in a pilot series of 19 patients examined were occurring, the possibility of a more serious before and after myelography there were five vitreous haemorrhage would always be present patients with asymptomatic retinal or pre- (Simon et al., 1973). retinal haemorrhages. At the time of the original presentation of this work, the authors were criticised for what appeared to be 'faulty' METHODS techniques and, indeed, they pointed out in a Twentypatientsundergoingpneumoencephalography footnote that, after certain modifications to the under general anaesthesia at the National Hospital procedure, no further haemorrhagic incidents for Nervous Diseases, Queen Square, were examined funduscopically before and after the procedure. In http://jnnp.bmj.com/ occurred. It was also claimed that such compli- the majority of cases, these examinations were cations were specific to gas myelography and did within a few hours of the encephalogram, and a not occur with, for example, pneumoencephalo- short acting mydriatic was employed. Fluorescein graphy. angiography was carried out in one case. Retinal haemorrhage is not a recognised complication of pneumoencephalography (Mil- kowski, 1969; Clark et al., 1970; Bergeron and RESULTS Rumbaugh, 1971), although intracranial hae- The patients have been divided into three groups: on September 28, 2021 by guest. morrhage, usually subdural, is well documented 1. Those in whom fundal examination was (Bucy, 1942; Robinson, 1957; Khalifeh et al., normal before and after the encephalogram (10 1964; Zotti, 1966; Calkins et al., 1967, Seshia, patients: Table 1). 1971; Mead, 1973); one case only of retinal haemorrhage appears to have been recorded 2. Those in whom pre-encephalogram fundu- (Hoyt and Beeston, 1966). However, many scopy revealed some abnormality which was unaffected by the radiological procedure (five 1 Present address: Department of Neurology, St. Bartholomew's patients: Table 2). Hospital, West Smithfield, London E.C.l. (Accepted 3 December 1975.) 3. Those in whom some intraocular lesion was 375 J Neurol Neurosurg Psychiatry: first published as 10.1136/jnnp.39.4.375 on 1 April 1976. Downloaded from 376 I. F. Moseley and J. B. Pilling TABLE 1 TABLE 2 PATIENTS WITH NORMAL FUNDI BEFORE AND AFTER PATIENTS WITH ABNORMAL FUNDI, UNCHANGED AFTER PNEUMOGRAPHY PNEUMOGRAPHY Patient Age Diagnosis Patient Age Diagnosis Funduscopy (yr) (yr) CH 58 Cerebral atrophy AP 34 Ischaemic papillitis Papilloedema both eyes PS 58 Atrophy + infarct BR 65 Chordoma Left optic atrophy AM 33 Cerebellar atrophy MR 16 Hydrocephalus Blurred disc margins HP 60 Pituitary adenoma NS 43 Thalamic tumour Discs pale MP 16 Retrobulbar neuritis SR 31 Suprasellar tumour Discs pale AT 39 Chiari malformation+ ? syringomyelia JB 14 ? Vestibular neuronitis AB 38 ? TD 39 ? BM 51 Normal TABLE 3 PATIENTS WITH INTRAOCULAR CHANGES AFTER PNEUMOGRAPHY (PEG) Patient Age Diagnosis Pre-PEGfunduscopy Post-PEG funduscopy (yr) GC 41 Optic neuritis Questionably swollen discs; venous Scattered perimacular, blot pulsation normal haemorrhages, left more than right TS 54 Cerebral atrophy ? Small haemorrhages left disc Scattered blot haemorrhages both eyes Protected by copyright. margin plus flame on left KF 11 Communicating hydrocephalus Bilateral papilloedema Florid, pre-retinal perivenous, haemorrhages both eyes WH 49 Recurrent meningioma Chronic papilloedema; small Small, fresh, pre-retinal perivenous haemorrhage on right haemorrhages both eyes LB 62 ? Cholesteatoma Normal Small linear exudate on right http://jnnp.bmj.com/ on September 28, 2021 by guest. FIG.1 Fluorescein angiography, carried out on patient GC, 48 hours after pneumoencephalography (a) left eye, 18 seconds, (b) right eye, five minutes. No significant angiographic abnormality is seen, but small haemor- rhages (dark spots) are seen scattered throughout both fundi. J Neurol Neurosurg Psychiatry: first published as 10.1136/jnnp.39.4.375 on 1 April 1976. Downloaded from Intraocular haemorrhage as a complication ofpleumoencephalography 377 Protected by copyright. FIG. 2 A patient in the Mimer III chair, in the FIG. 3 The patient is inverted duirinig the somersault 'hanging head' position. This may be sustained for manoeuvre. The neck veins are engorged and the several minutes while tomography is carried out. The facial skin is darker-hued than that of the hands or cuirasse-type harness is showni. legs. Much of the weight is taken on the chest. http://jnnp.bmj.com/ produced or exacerbated by the encephalogram There was no significant difference between (five patients: Table 3). the duration of anaesthesia in groups (1), (2), In every case, the encephalogram was carried and (3), the mean for the first two groups being out under general anaesthesia, with atropine 130 minutes, and for the last 135 minutes. In all on September 28, 2021 by guest. premedication, induced with methohexitone and three the mean volume of air injected was 35 ml. suxamethonium and maintained with a nitrous Of the five patients who showed fresh fundu- oxide/oxygen/trichlorethylene mixture and with scopic abnormalities after the encephalogram, pancuronium. Intermittent positive pressure three denied any visual disturbance as a result respiration was always employed. The patients of the lesions, while one (WH) still showed a were placed in the Mimer III apparatus and, in hemianopia which had been present before the every case, the somersault manoeuvre was used procedure. The last (GC) thought that some to fill the temporal horns. improvement in his visual acuity which he had J Neurol Neurosurg Psychiatry: first published as 10.1136/jnnp.39.4.375 on 1 April 1976. Downloaded from 3783L F. Moseley and J. B. Pilling noticed shortly before the encephalogram had been maintained. This last patient was subjected to fluorescein angiography, which showed no abnormality (Fig. 1). DISCUSSION Since the haemorrhages seem to be of venous origin, factors causing raised intracranial and/or intraocular venous pressure must be sought. In this situation, several may be contributory. HEAD-DOWN POSITION During much of the procedure, the patient's legs are above the head and in certain positions-for example, when the anterior end of the third ventricle is being examined (Fig. 2) and during the somersault manoeuvre (Fig. 3)-this may be exaggerated. Although no correlation between the duration of anaesthesia and the incidence of haemorrhage was found, this factor cannot, we think, be dis- Protected by copyright. regarded. In the case of retinal haemorrhage after an encephalogram described by Hoyt and Beeston (1966), there was a suggestion that an excessive amount of time had elapsed with the patient inverted. COMPRESSION OF ABDOMEN AND THORAX In the chair of the Mimer III, the anaesthetized patient FIG. 4 The initial erect position, before injection of is supported, in part, by a flexible cuirasse, and air. The neck veins are clearly engorged. much of the weight is taken on this in the 'brow down' position. We have noticed that the neck veins may be engorged and the face rather dusky (Fig. 4) in the erect position, when the pressure traumatic asphyxia-a severe form of crush on the thorax should be least. Compression injury in which retinal lesions are found along injury of the chest is almost certainly the causa- with severe systemic disturbance-have been http://jnnp.bmj.com/ tive factor in Purtscher's disease-traumatic reviewed by Ravin and Meyer (1973). The normal retinal angiopathy-in which retinal exudates findings in the present case are not at variance and haemorrhages were originally (Purtscher, with this since, clearly, the degree of compression 1910) thought to be due to an associated head during encephalography is much milder, al- injury. Stockhusen (1938) described traumatic though, in a discussion of what he termed retinal angiopathy in a pilot who crashed while 'Valsalva haemorrhagic retinopathy', Duane wearing a halter-type safety harness. This was a (1973) suggested that frank haemorrhages occur- on September 28, 2021 by guest. relatively severe injury, but bilateral retinal red only with a severe rise
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