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Effect of Magnesium Sulfate (A Laxative) on Accommodation and Converegence Function by Osude-Uzodike, E

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Effect of Magnesium Sulfate (A Laxative) on Accommodation and Converegence Function by Osude-Uzodike, E EFFECT OF MAGNESIUM SULFATE (A LAXATIVE) ON ACCOMMODATION AND CONVEREGENCE FUNCTION BY OSUDE-UZODIKE, E. B. AND AKANOH, R. N. DEPARTMENT OF OPTOMETRY,ABIA STATE UNIVERSITY UTURU, ABIA STATE, NIGERIA Email:[email protected] *Corresponding author ABSTRACT Magnesium sulfate (MgSO4 ), a laxative and over-the-counter drug is abusively used by individuals to relieve constipation, hard and inconsistent stool, and after effect of poor diet. Thirty young volunteers of both sexes were administered 15g of MgSO4 effervescence laxative. The effect of the drug on accommodation, accommodative convergence /accommodation (AC/A) ratio, near point of convergence (NPC) and lateral phoria at far and near were studied by measuring these visual functions pre and post MgSO4 administration. Results showed that there was no effect on accommodation, NPC decreased with a peak percentage decrease of 27.5%, lateral phoria at far had peak percentage decrease of 375.4%, lateral phoria at near had peak percentage decrease of 50.9% and AC/A ratio a percentage decrease of 43.4%. These effects were found to be significant (P<0.05). Eye care practitioners should advise their patients to desist from abusing laxatives and other over-the-counter drugs and should consider its effects during analysis of visual test finding for effective patient care. KEYWORDS: Magnesium sulfate, Laxatives,Accommodation, Convergence, Near point of convergence, Lateral phoria. INTRODUCTION rectal reflex and laxatives dependent constipation3 . Laxatives of various types are widely prescribed Chronic use of laxatives can become habituating and more widely purchased without prescription leading to the development of a dilated atonic indicating a cultural pre-occupation with laxative colon, which requires increasing laxative 1 “regularity” of intestinal walls and stool . They are use with little success5,6 . generally described as over-the-counter (OTC) Magnesium sulfate also known as Epsom salt products2 . or bitter salt9 is a hydrate salt with a chemical name Laxative drugs that affect the fecal constituent of magnesium sulfate heptahydrate9,10 . Chemical accelerate elimination of stool from the rectum3 . 11 formula is MgSO4 . 7H 2 O and trade name is They can be used to relieve constipation during Andrews liver salt. pregnancy, in those whose bowel motility has been Dried magnesium sulfate is an osmotic laxative4,11 altered through use of anticholinergic drugs, or a saline laxative12,13 that acts by increasing the narcotics, antihelmintic therapy and generally bulk of the stools through attracting and holding 4 short-term treatment of constipation and other large amounts of fluids, the increased bulk results possible conditions that can lead to constipation inthe mechanical stimulationof peristalsis4 . like condition within the colon and rectum or Systemically administered drugs are known to 5,6,7 externally . The external conditions can be as a produce effect in the eye when sufficient result of poor dietary habits (most common), concentration of the drug reaches its site of action medications and psychological factors. Bowel- in the eye and can influence various clinical conscious individuals easily abuse laxatives. procedures and visual test results. Laxatives like other being an OTC drugs, the result The adverse effect of MgSO4 in the body may be similar to simple, prolonged diarrhea with system can also affect the eyes hence it is worth- symptoms of potassium ion (K+) depletion, while that the ocular and visual effects (if any) are intestinal hypotonus, alkalosis and muscle known by the primary eye-care practitioners for 8 weakness . The use of laxatives may become better patient management. habitual and can lead to hyponatremia, loss of the JNOA - VOL 10, 2003 8 MATERIALSANDMETHOD 72hours post ingestion (see fig. 2). Zcal (8.819) was Effect of magnesium sulfate on found to be greater than Ztab (1.96 0.05 ), hence, it was accommodation and convergence functions is a concluded that ingestion of 15g of MgSO4 had prospective and clinically based study. Abia State significant effect on NPC. The minus signs showed University Optometry Clinics (Uturu and that the values were less than the baseline value. Umuahia) were used for the study. Thirty healthy Analysis of data obtained showed that lateral volunteers between the ages of 18 and 34years phoria at far decreased gradually from 2hrs after were used. Those volunteers with ocular MgSO4 intake by -0.82±0.16Δ D and had a peak pathology, refractive error and history of systemic decrease 4hrs after intake with induced change of - abnormalities were screened out as suchconditions 2.29±0.28Δ D.The peak percentage induced might jeopardize the test results. Experimental change was 375. 4%. It then returned to baseline subjects were well fed during the period of the value 72hrs post ingestion. Fig. 3 showed the study and they served as their own control. graphical representation of this effect. Statistical The visual functions of i nt e res t : analysis showed a significant effect of MgSO4 on accommodation (using minus-lens-to-blur lateral phoria at far (Z 10.6> Z 1.96 at 96% method), lateral phoria (using Von-Graefe cal tab confidence interval). technique), NPC (using PD rule) and AC/A ratio Fig. 4 represents the analysis of the MgSO (using the induced phoria method) were measured 4 pre and post MgSO administration. The research effect on lateral phoria at near. Lateral phoria at 4 near decreased gradually from 2hrs after MgSO lasted fora period of 3days. Pilot studyshowedthat 4 systemic effects start 2hours after 15g MgSO intake by 0.98±0.18Δ D. Peak induced change was 4 obtained 4hrs after intake with induced change of - ingestion, hence, measurement of visual functions 2.8±0.31Δ D and percentage induced change of started 2hours post administration of 15g MgSO 4 50.9%. It returned to baseline value 72hrs post on volunteer subjects. The visual functions were ingestion. Statistically, the effect was shown to be reassessed at intervals of 30minuts till 2hours after significant (Z 7.68>Z 1.96). MgSO ingestion and then once daily for the next cal tab 4 From fig. 5, AC/A ratio decreased gradually 3days. Data obtained were analyzed using tables, from 2hrs after MgSO by 0.56±0.14. Peak figures andZ-test forsignificance ofthe result. 4 intake decrease was obtained 4hrs after intake with Magnesium sulfate used was manufactured induced change of -1.98±0.26 and percentage from Glaxo Smith Kline (Nig. PLC) with batch no. induced change of 43.4%. AC/A gradually 034E. increased and returned to baseline value 72hrs post ingestion. Statistically, the induced effect was RESULTS foundto be significant (Z 5.89>Z 1.96). The test substance, Magnesium sulfate cal tab heptahydrate was administered on volunteer subjects and its effect on visual functions of DISCUSSION interest was measured. The analysis of the data Analysis of data obtained as a result of administration of 15g MgSO , a laxative, on obtained is presented below. The symbol used in 4 the graphs: Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8, volunteer subjects showed no effect on amplitude represents 2hours, 2½hrs, 3hrs, 3½hrs, 4hrs, of accommodation (P>0.05) but significant effect 4½hrs, 24hrs, 48hrs, and 72hrs post ingestion of on NPC, lateral phoria at far and near and AC/A magnesium sulfate respectively. ratio(see figs.2-5; P<0.05). These effects can be explained on the stimulation Fig. 1 showed that MgSO4 has no effect on Amplitude of Accommodation (A.A). When the of parasympathetic nervous system in stimulating data obtained was subjected to statistical analysis, peristalsis, as the bulk of the stool is increased4,7,12,14,15 . Postganglionic parasympathetic Ztab (1.96 0.05 ) was found to be greater than Z cal (0.32) confirming the graphical representation. fibres stimulate accommodation while NPC deceased gradually from 2hours after preganglionic parasympathetic fibres stimulate convergence. In both the preganglionic and magnesium sulfate intake by 1.32cm, peak postganglionic parasympathetic fibre stimulation, decrease was obtained 4hrs after intake with 16,17 induced change of -2.8cm and percentage induced acetylcholine will be released . Ingestion of MgSO stimulates peristalsis and change of27.59%. It started to increase from 24 hrs 4 post ingestion and returned to baseline value suppresses myenteric plexus, which is also innervated by the preganglionic parasympathetic 9 JNOA - VOL 10, 2003 system. The information is sent to the brain stem synkinesis between accommodation and where the neurons of the reticular activating convergence and the accommodation by MgSO4 system processes the information and in turn administration can be explained by the fact that stimulates the motor part of the vagus nerve and ciliary body and iris sphincter muscles involved in motor part of any other cranial nerve (oculomotor accommodative action are supplied by autonomic nerve inclusive). Innervations of the motor part of fibres of oculomotor nerve not the motor fibres of the oculomotor nerve led to stimulation of medial oculomotor nerve which is being affected by recti muscles of both eyes increasing the tonic MgSO4 . convergence which results in decreased values of In conclusion, MgSO4 effervescence, a NPC and lateral phoria (far and near) tending laxative and OTC drugs, when abused can lead to towardsesophoria (as shown infigs 2-5). over convergence and esophoric conditions which The effect of 15g MgSO4 on AC/A ratio is a could degenerate to binocularity problem. Primary cumulative effect and is supported by Borish's18 eye care practitioners should take note of the use of assertion that central nervous depressants decrease over-the-counter drugs and advice patients against AC/A ratio by selectively reducing convergence its abuse. They should also consider it while response without affecting accommodation and prescribing to the patients as it affects some visual that generally, the action of drugs indicate a test results.
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