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The Acute and Long-Term Ocular Effects of Accelerated Hypertension: a Clinical and Electrophysiological Study

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The Acute and Long-Term Ocular Effects of Accelerated Hypertension: a Clinical and Electrophysiological Study THE ACUTE AND LONG-TERM OCULAR EFFECTS OF ACCELERATED HYPERTENSION: A CLINICAL AND ELECTROPHYSIOLOGICAL STUDY 1 2 2 3 3 L2 S. J. TALKS , , P. GOOD , C. G. CLOUGH , D. G. BEEVERS and P. M. DODSON Birmingham SUMMARY the invention of the ophthalmoscope in 1851 the Thirty-four patients with accelerated hypertension were causes of this disturbance could be described? clinically examined. The visual evoked potential (VEP) Leibreich,4 in 1859, was the first to describe and electroretinogram (ERG) were recorded: acutely 'albuminuric retinitis' in Bright's disease. However, in 12 patients, being repeated in 7 patients up to 6 it was not until 1914, after the invention of the Riva­ months later. In the remaining 22 patients these tests Rocci sphygmomanometer at the end of the nine­ were performed 2-4 years after presentation. Visual teenth century, that Volhard and Fahr6 related the acuity was 5.6/12 in 22 of 68 (32 %) eyes at presentation retinopathy to arterial hypertension. and 5.6/12 in 10 of 58 (19%) eyes at follow-up. The It was then realised that the fundal appearance cause of severest loss of vision appeared to be anterior was associated with the severity of the hypertension ischaemic optic neuropathy, found in 3 cases. During and with the prognosis of the patient. In 1939 Keith the acute stage 11 patients (92%) had abnormal VEPs et aC drew up a four-group grading system. Grade 3 and all had abnormal ERGs. The group mean PI00 (more recently called accelerated hypertensionS) latency, of the 7 patients (14 eyes) seen acutely and consisted of 'angiospastic retinitis', 'characterised followed up at 6 months, was 123.8 ms with significant especially by oedema, cotton wool patches, and recovery of latency (p<0.005) to 110.9 ms. The ERGs, haemorrhages in the retina superimposed on a however, remained reduced and delayed. In those combination of sclerotic and spastic lesions in the patients recorded 2-4 years after their acute episode the arterioles'. Grade 4 (malignant hypertension) had YEP was abnormal in only 2 patients (9%); group the same picture with disc oedema. This group of mean PI00 latency was 109.1 ms. However, 18 patients patients had the worse prognosis, with 79% dead (82%) had abnormal ERGs. We suggest that during the within 1 year and only 1 % surviving at 5 years. This acute stage of accelerated hyertension there is a high classification is still used9 but more recently it has incidence of ischaemic optic neuropathy that usually been found that there is little difference in the resolves but can cause a permanent anterior ischaemic survival of patients with grade 3 or 4 hypertensive optic neuropathy, in addition to vascular retinopathy retinopathy.lO·11 It has therefore been proposed that that persists. the two stages be classified together and called accelerated hypertension.12,13 The effects of hypertension on the eye have long The prognosis for patients with accelerated hyper­ been recognised. In 1836, Bright! gave the first tension has greatly improved with the advent of report of renal disease associated with visual effective hypertensive treatment.14,15 However, the disturbance. Mackenzie? reporting a case of Bright's condition is still serious. The 10 year survival of such disease, wrote that 'the heart, the brain and the patients was reported as 48% in a paper published in organs of vision seem peculiarly liable to suffer from 1986,11 but many centres now have 5 year survival it', and that the deterioration of vision may vary data of 80%? with a worse prognosis in patients 'from dimness up to total insensibility to sight'. With with renal failure. With treatment, the damaging From: lDepartments of Medicine and Ophthalmology, Bir­ effect of hypertension is greatly reduced, but it is not mingham Heartlands Hospital; 2Birmingham and Midland Eye all reversed.16 Retinopathy and disc swelling usually 3 Hospital; and University Department of Medicine, City Hospital, disappear within 6-12 months of the onset of Birmingham, UK. Correspondence to: Mr S. J. Talks, The Eye Hospital, Radcliffe antihypertensive therapyP However, retinal and Infirmary, Woodstock Road, Oxford OX2 6HE, UK. optic nerve function may not return to normal Eye (1996) 10,321-327 © 1996 Royal College of Ophthalmologists 322 S. J. TALKS ET AL. because of infarction.1k Little has been written on the proteinuria. In the majority the blood pressure was long-term effects of hypertension on ocular function. greater than 200/140 mmHg. An exact level of blood With increased survivaL studies on this aspect are pressure is not required for the diagnosis of now appropriate. accelerated hypertension.n All had a clinical ocular The effects of hypertension on the eye can be examination at presentation, including pupil dilation divided into hypertensive retinopathy, choroidopa­ as well as systemic examination and investigations, thy and neuropathy.19.20 There has been debate including urea and electrolytes, creatinine. chest about whether disc swelling in accelerated hyperten­ radiograph and electrocardiogram (all were exam­ sion is due to raised intracranial pressure or to ined by the authors). Patients with ocular or ischaemia.21 We felt electrophysiological measure­ neurological abnormalities not related to hyperten­ ments would be useful to examine these processes sion were excluded. All the patients had repeat and are not aware that this has been done before. clinical examinations at follow-up. Twelve of the patients had electrophysiological SUBJECTS AND METHODS and visual field measurements within a few days of A total of 34 patients with accelerated hypertension their acute presentation. Seven of these were were studied: 20 males, 14 females (age range 17-80 followed up for up to 6 months with repeat years, mean age 47.5 years). These patients were measurements. Twenty-two of the patients had referred to the authors over an 8 year period for the electrophysiological and visual field measurements management of accelerated hypertension. The only 2-4 years after their initial presentation, but not patients were studied prospectively; however, not at acute presentation. all the patients had electrophysiological tests acutely The information recorded was: best corrected as will be explained. The diagnosis was made on visual acuity; fundal appearance (this was documen­ finding grade III or IV hypertensive retinopathy ted by grading with the Keith, Wagener, Barker (Keith, Wagener, Barker classification: grade III, classification in both the acute and treated patients, narrowing of retinal arterioles, arteriovenous nip­ plus by other features, such as optic atrophy, being ping, cotton wool spots, haemorrhages, exudates, recorded); Goldmann visual fields; pattern visual retinal oedema; grade IV, the same changes plus disc evoked potentials (VEP); flash electroretinograms swelling) in combination with hypertension and (ERG). As this study was carried out over an 8 year ----r-- - -, RIght eye I Right eve I Repeat Repeat Right eye I 5 month Right eye ! follow-up 2 -1 month fn!l()\\-up Repeat lOOms Fig. 2. Patient 5, from Table 11 (male, aged 27 years). I ()()nv.; Right YEP during the acute phase showing a paramacular Fig. 1. Patient 1, from Table 11 (female, aged 19 years). (P 135) response to 50 minute checks. Repeat traces are The right YEP, during the acute phase, showing a shown. This resolved 5 months later. The left eye (not paramacular response to 50 minute checks. Repeat traces illustrated) had a delayed low-amplitude response that did are shown. This resolved 4 months later. not resolve. OCULAR EFFECTS OF ACCELERATED HYPERTENSION 323 period, only two of the more recently performed tests of a 50 minute checkerboard reversing at 5.9 Hz. The included pattern electroretinograms (PERG). responses were averaged 150 times and repeated The YEP and ERG results were compared with 20 three times, using an artefact rejection of 50 f.1V and randomly selected controls. These were age- and sex­ a band-pass of 1-100 Hz. matched normotensive, normal subjects with no Statistical analysis of results was done using the neurological or ophthalmic abnormality, selected paired t-test for comparisons of findings in those from the electrophysiological department's control patients assessed both acutely and at 6 month follow­ data base (mean age 43.8 years; 10 male, 10 female). up (n = 7) and using analysis of variance with VEPs were obtained using a Nicolet C4 clinical Bonferroni's procedure for comparisons of findings averager. The stimulus consisted of a black and white between controls, acute patients and long-term post­ checkerboard of 100% contrast reversing at 1.9 Hz. acute patients without acute data. Figures from The stimulus field was 14 degrees, and the check size individual eyes were used for calculations. was 50 minutes of arc subtended at the eye. A Ag/ AgCI electrode was located at positions Fz (10/20 montage system) and referred to Ag/AgCI electrodes RESULTS positioned at 01 and 02. The amplifier band-pass Visual Acuity filterwas set at 1-50 Hz and artefact rejection was set At presentation 22 eyes (22/68, 32 %) had a best at 100 f.1V. No notch filtering was employed. For each corrected visual acuity of �6/12. At follow-up 10 recording sequence 40 averages were obtained, and eyes (10/58, 17%) had visual acuities of �6/12. The this was repeated two times for responses falling separate figures for the patients seen at 6 month within the normal range of amplitude and latency, follow-up and those with 2-4 years of follow-up are and three times for abnormal responses. given in Table I. The long-term causes of decreased The presence of PNP wave forms in pattern VEPs visual acuity were: anterior ischaemic opti� neuro­ of patients with anterior ischaemic optic neuropathy pathy (3), including one which developed after (AI ON) has been previously described by Thompson starting treatment), continuing macular exudates et al.,22 where the PIOO macular response is replaced (4), branch vein occlusion (1), cataract (1) and by a P135 paramacular response leaving a negative atrophic depigmented area of macula (1).
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