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. 2021 Feb 18;2(2):CD013390.
doi: 10.1002/14651858.CD013390.pub2.

Surgical interventions for infantile nystagmus syndrome

Kwang M Cham  1 , Larry A Abel  1 , Ljoudmila Busija  2 , Lionel Kowal  3 , Anat Bachar Zipori  4 , Laura E Downie  1
Affiliations

Surgical interventions for infantile nystagmus syndrome

Kwang M Cham et al. Cochrane Database Syst Rev. .

Abstract

Background: Infantile nystagmus syndrome (INS) is a type of eye movement disorder that can negatively impact vision. Currently, INS cannot be cured, but its effects can potentially be treated pharmacologically, optically, or surgically. This review focuses on the surgical interventions for INS. Despite the range of surgical interventions available, and currently applied in practice for the management of INS, there is no clear consensus, and no accepted clinical guidelines regarding the relative efficacy and safety of the various treatment options. A better understanding of these surgical options, along with their associated side effects, will assist clinicians in evidence-based decision-making in relation to the management of INS.

Objectives: To assess the efficacy and safety of surgical interventions for INS.

Search methods: We searched CENTRAL, MEDLINE Ovid, Embase Ovid, ISRCTN registry, ClinicalTrials.gov, and the World Health Organization (WHO) International Clinical Trials Registry Platform (ICTRP) to 3 July 2020, with no language restrictions.

Selection criteria: We included randomised controlled trials (RCTs) studying the efficacy and safety of surgical options for treating INS.

Data collection and analysis: Our prespecified outcome measures were the change from baseline in: binocular best-corrected distance visual acuity; head posture; amplitude, frequency, intensity, and foveation period durations of the nystagmus waveform; visual recognition times; quality of life and self-reported outcome measures; incidence of adverse effects with a probable causal link to treatment; and permanent adverse effects after surgery. Two review authors independently screened titles and abstracts and full-text articles, extracted data from eligible RCTs, and judged the risk of bias using the Cochrane tool. We reached consensus on any disagreements by discussion. We summarised the overall certainty of the evidence using the GRADE approach.

Main results: We only identified one eligible RCT (N = 10 participants), undertaken in India. This trial randomised participants to receive either a large retro-equatorial recession of the horizontal rectus muscle of 9 mm on the medial rectus and 12 mm on the lateral rectus, or a simple tenotomy and resuturing of the four horizontal rectus muscles. We did not identify any RCTs comparing a surgical intervention for INS relative to no treatment. In the single eligible RCT, both eyes of each participant received the same intervention. The participants' age and gender were not reported, nor was information on whether participants were idiopathic or had sensory disorders. The study only included participants with null in primary position and did not explicitly exclude those with congenital periodic alternating nystagmus. The study did not report funding source(s) or author declaration of interests. The evaluation period was six months. We judged this study at low risk for sequence generation and other sources of bias, but at high risk of bias for performance and detection bias. The risk of bias was unclear for selection bias, attrition bias, and reporting bias. There is very uncertain evidence about the effect of the interventions on visual acuity and change in amplitude, frequency, and intensity of the nystagmus waveform. We were unable to calculate relative effects due to lack of data. None of the participants in either intervention group reported adverse effects at six-month follow-up (very low-certainty evidence). There was no quantitative data reported for quality of life, although the study reported an improvement in quality of life after surgery in both intervention groups (very low-certainty evidence). Change in head posture, foveation period durations of the nystagmus waveform, visual recognition times, and permanent adverse effects after surgery were not reported in the included study. We judged the certainty of the evidence, for both the primary and secondary efficacy outcomes, to be very low. Due to a lack of comprehensive reporting of adverse events, there was also very low-certainty of the safety profile of the evaluated surgical interventions in this population. As such, we are very uncertain about the relative efficacy and safety of these interventions for the surgical management of INS.

Authors' conclusions: This systematic review identified minimal high-quality evidence relating to the efficacy and safety of surgical interventions for INS. The limited availability of evidence must be considered by clinicians when treating INS, particularly given these procedures are irreversible and often performed on children. More high-quality RCTs are needed to better understand the efficacy and safety profile of surgical interventions for INS. This will assist clinicians, people with INS, and their parents or caregivers to make evidence-based treatment decisions.

PubMed Disclaimer

Conflict of interest statement

KMC: none known LAA: no direct conflicts of interest; one reimbursement by a non‐profit‐organised research workshop and one hour's expert witness testimony on nystagmus and stress LB: Monash University received payments from Jesuit Social Services Limited (Victoria, Australia) and Charité – Universitätsmedizin Berlin for statistical consultancy work performed by LB LK: none known ABZ: none known LED: has previously received funding to undertake clinical trials in the fields of dry eye disease and contact lenses, which are unrelated to this work, from Allergan Pty Ltd, Alcon Pty Ltd, Azura Ophthalmics Pty Ltd and Coopervision Pty Ltd.

Figures

1
1
Study flow diagram
2
2
'Risk of bias' graph: review authors' judgements about each risk of bias item presented as percentages across included study
3
3
'Risk of bias' summary: review authors' judgements about each 'Risk of bias' item across included study
See this image and copyright information in PMC

Update of

  • doi: 10.1002/14651858.CD013390

References

References to studies included in this review

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