INTRODUCTION Death due to severe scorpion envenoming syndrome. VS Natu*, RKK Murthy**, KP Deodhar*** Abstract. Original Article
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1 Original Article Efficacy of Species Specific Anti-scorpion Venom Serum (AScVS) against Severe, Serious Scorpion Stings (Mesobuthus tamulus concanesis Pocock) An Experience from Rural Hospital in Western Maharashtra VS Natu*, RKK Murthy**, KP Deodhar*** Abstract Background : Death caused by scorpion envenoming is a common event in the tropical and subtropical countries including many regions in India. Severe scorpion envenoming causes an autonomic storm producing multi-system organ-failure (MSOF) and death. Objectives : To determine the efficacy of Anti-scorpion venom serum (AScVS) in patients stung by scorpions (Mesobuthus tamulus concanesis Pocock earlier called Buthus tamulus); to compare it with other modalities of therapy and to detect complications, if any, arising out of AScVS treatment. Methods : Total 48 patients of severe, serious scorpion envenoming syndrome were studied during the period from 1992 to In 17 patients AScVS was the only mode of treatment. Others had received adjunctive therapy along with AScVS. Results : 47 patients out of 48 scorpion sting victims recovered completely. Recovery period in patients given AScVS (10 hours) was faster than those who received alpha blockers (16-42 hours). No anaphylactic reaction with AScVS was observed. Conclusions : AScVS is effective and safe method of therapy in severe scorpion envenoming syndrome. INTRODUCTION Death due to severe scorpion envenoming syndrome is a common event in the developing tropical and sub-tropical countries of Africa, Latin America, China, India and the Middle East. 1-4 All over the world there are about 650 species of scorpions that belong to 6 families. Buthidae is the largest family of the scorpions with the most toxic species such as the Androctonus, the Buthus, the Centruriodes, the Leiurus quinquestriatus and the Tityus. India harbors 99 scorpion species from six families, of which 45 species belong to Buthidae family. The venomous scorpions of Buthidae are responsible for a number of deaths in infants, children and adults. 5 These killer scorpions are geographically distributed all over *Vijayshree Hospital,Ghonsare, Chiplun, Ratnagiri, **Professor and Head, Dept. of Physiology, Seth GS Medical College, Parel, Mumbai ***Professor and Head, Dept. of Pathology, LTM Medical College, Sion, Mumbai Received : ; Revised : ; Re-revised : ; Accepted : the length and breadth of India. 5 In spite of zoological differences resulting in venoms of differing chemical structure, the signs and symptoms following stings by scorpions of Buthidae from all over the world are remarkably similar Severe scorpion envenoming causes an autonomic storm with massive release of catecholamines. The symptoms and signs are vomiting, profuse sweating, absence of pain to severe excruciating pain at the site of the sting, increased salivation, generalized tingling & numbness, priapism, tachycardia, tachypnoea, transient hypertension followed by hypotension and pulmonary edema. The earlier experimental studies on scorpion (Mesobuthus tamulus concanesis Pocock) envenoming demonstrated cardiac sarcolemmal defects displayed by alterations in Na + -K + ATPase, Mg ++ ATPase and Ca ++ ATPase activities. 7 initial transient hypertension followed by hypotension and shock, glycogenolysis in atria, ventricle, liver and skeletal muscle, hyperglycemia, increased free fatty acid levels and reduction in JAPI VOL. 54 APRIL
2 triglyceride levels, 5,8,9 altered erythrocyte Na + -K + ATPase activities resulting in osmotic fragility changes of red blood cells, involvement of exocrine pancreas causing acute pancreatitis, changes in insulin levels (hypoinsulinemia followed by hyperinsulinemia), increased glucagon, thyroid hormones (T 3, T 4 ), cortisol, angiotensin II levels; increased clotting time, Prothrombin time, thrombin time, partial thromboplastin time with kaolin, decrease in fibrinogen and acute reduction in platelet count, absence of factors V, VII and VIII in envenomed animals indicative of DIC, reduced partial pressure of oxygen, bicarbonate, changes in PH (acidosis), increased lactic acid and ketoacid levels, are also demonstrated. All these changes in scorpion envenoming indicate the involvement of multiple systems and organs and their failure along with cardiogenic pulmonary edema and Adult Respiratory Distress Syndrome (ARDS). 5 Experimental study shows that antivenom administration resulted in reversal of ECG changes and reduction in LDH, SGOT, SGPT, CK-MB and alpha HBDH enzyme levels. 5,12,13 AScVS without any adjunctive therapy caused the return of normal blood pressure from hypertensive levels, prevented a further rise in blood pressure; maintained blood pressure and prevented the occurrence of hypotension. 12,13 Additionally, AScVS caused the return of normal blood pressure from hypotension, maintained blood pressure and prevented the occurrence of hypotension and hypertension. 12,13 If the antivenom did not inhibit the catecholaminemediated toxicity, which in turn suppressed the release of insulin secretion it would have resulted only the arrest of a further rise in hyperglycemia and FFA concentration. The attainment of normal blood glucose level and lipogenesis following antivenom therapy in the experimental animals indicated that the antivenom effectively neutralized the inhibiting action of catecholamines on insulin secretion. This resulted in physiologically active insulin secretion. 12,13 AScVS was available in few countries. 2 Haffkine Biopharmaceutical Corporation Ltd. (Mumbai) manufactured AScVS, conducted clinical field trials in 1992 and marketed it in Now with the free availability of antivenom, more rational treatment is use of AScVS to neutralize the venom present in the circulation and body fluids. AScVS is lyophilized monovalent enzyme refined immunoglobulins specific for the scorpion Mesobuthus tamulus concanesis Pocock. 1 ml. of AScVS neutralizes 1 mg. of dried scorpion venom. Usual mode of AScVS administration is either by i.v. or i.m route. Scorpion antivenins are rather species specific. 16 The toxicity of venom, collected from a scorpion, depends on age of the offending scorpion, season of the year; and the age, sex and weight of the scorpion stung victim. The amount of venom injected in to a victim is variable in scorpion stung patients. Therefore the dose of AScVS has to be increased till the symptoms are abolished. If the sufficient dose of antivenom are used, adjunctive therapy is seldom required. 12 Previously mortality rate following scorpion envenoming syndrome was 25-30%, with the use of alpha blocker therapy the mortality has reduced to 2-5%, but recovery time varies from hours and close monitoring for 48 hours is necessary as patient may develop pulmonary edema even after administration of alpha blocker (Prazocin). 17 The long stay of the venom in the body explains the development of pulmonary edema even after administration of alpha blockers and indicates the importance of neutralization of scorpion venom by AScVS. This study assessed the use of AScVS in 48 severe scorpion sting cases. MATERIAL AND METHODS 48 patients of scorpion sting treated with AScVS were studied prospectively. Confirmation of the species of the killer scorpion was made by identification of the preserved specimen. It was diagnosed on clinical presentation in one case of unknown sting. An adult male gave a history of passing of thick secretions like ejaculation, before the act of passing urine. Blood pressure, temperature, pulse and respiratory rate were recorded on admission and after completing the dose of AScVS. ECG was recorded in 15 cases at 4 and 8 hours after AScVS. All cases were given AScVS developed by Haffkine Biopharmaceutical Corporation Ltd; Mumbai (Batch no-110, 402-1, 403-1). 10 ml. Sterile Water for injection was used for reconstitution of one vial of AScVS. Informed consent was taken for AScVS treatment. AScVS test dose was given on forearm. Patient was observed for hypersensitivity reaction to antivenom for 15 minutes. 3 ml of reconstituted AScVS was injected i.m. every 15minutes and the contents in one AScVS vial were given in an hour. AScVS was given as slow i.v. bolus in severe cases of pulmonary edema with haemoptysis and cardiac arrhythmias. Patient was assessed clinically again after administration of one vial of AScVS. 2 nd, 3rd and 4th vials of AScVS were injected depending upon severity of envenomation. Inj. antihistamines and steroids were given along with AScVS (10 cases) till the year AScVS alone was given in 17 cases out of which 4 cases were before 2000, but after the year 2000, AScVS alone was used to start the treatment and 2-3 vials were injected one after another in critically ill victims, and was found to be sufficient in 13 cases. Adjunctive supportive therapy like inj. lasix, inj. Aminophylline with glucose, steroids and oxygen were used along with AScVS in another 10 patients of pulmonary edema JAPI VOL. 54 APRIL 2006
3 In 11 cases, Prazosin was already given at peripheral primary health centre, and these patients were referred here as early improvement was not seen. These patients were then given AScVS and adjunctive treatment of inj. lasix, aminophylline and glucose. Prazosin was not repeated in our study. Local anesthesia at the site of sting was necessary in 3 pediatric cases. These patients complained of severe pain after systemic recovery. Attainment of normal pulse rate from tachycardia; warm extremities in cases of perspiration and cold clammy skin; blood pressure reaching normal levels in scorpion stung patients in whom the earlier blood pressure at the time of admission was low and sometimes not recordable; blood pressure reaching normal levels in whom there was hypertension; normal respiratory rate in patients with tachypnoea; and increasing pain at the site of the sting were considered as signs of improvement. RESULTS Total 48 cases were studied. 24 patients of scorpion sting reported within 2 hours, 14 patients reported within 4 hours and rest 10 patients within 4 to 8 hours. Pulse, respiratory rate, blood pressure and coldness of extremities were recorded on admission (Table 1). Blood pressure was not recordable in 12 pediatric patients. Priapism was seen in 6 cases, (adults as well as in pediatric age group). Complete improvement was seen in 2 hours in pediatric age group. Overall 41 out of 48 patients recovered completely within 12 hours (Table 1). In the present study one vial of AScVS (one vial of lyophilized AScVS was reconstituted with 10 ml. Sterile water) was sufficient in 28 cases. 20 ml. were required to neutralize the venom in 9 cases. 30 ml. in 9 cases, 60 ml. and 80 ml. were required in one case each. Table 2 : Year-wise distribution of scorpion sting victims Male Female Age-wise distribution of scorpion sting victims. Male Female Upto 12 years years Above 30 years ECG showed improving pattern 4 hours after AScVS. Ectopics disappeared within 2 hours of AScVS in an 11 year old female patient. Patient with severe perspiration with cold extremities started showing improvement within 4 hours. Eight out of 11 patients of severe tachycardia (H.R>120/min) had normal heart rate at the end of 12 hours after AScVS. 4 out of 11 patients had received prazocin before coming to this hospital. There were 8 patients with severe hypertension (B.P.>160/100 mm of Hg). Out of these, two young patients showed early recovery within 6 hours. Five patients improved within 12 hours and one after 16 hours. One patient out of these 8 patients had received prazocin at periphery. Most of the tachypnoea patients with fine crepitations had normal respiratory rate within 12 hours. Four patients had severe pulmonary edema with frothing. Two out of these 4 cases of pediatric age group showed early improvement within 6 hours. None of the patients had anaphylactic reaction. One Patient had rash behind left ear and back. Other Patient had allergic rash all over the body and itching. None had severe, rash which subsided after injecting dexamethasone and antihistaminic drugs. Table 1 Pulmonary Hyper- Hypo- Perspiration Tachycardia Pri- Recovery period edema tension tension cold apism Hours extremeties & more Ad Pae Ad Pae Ad Pae Adult Paed Adult Paed Ad Pae Patients treated with AScVS ( n=17 ) Patients treated with AScVS + steroids * antihist. ( n=10 ) AScVS + frusemide+ Aminophyllin+Glu O2 + stero.( n= 10) Patients who received alpha blocker first then referred here & treated with AScVS + adjunct treatment ( n=11) * - ventricular ectopics JAPI VOL. 54 APRIL
4 DISCUSSION Scorpion envenoming causes release of massive amount of catecholamines, (epinephrine and norepinephrine) 5 and suppresses insulin secretion. This causes lipolysis and results in increased FFA levels, which are arrhythmogenic in nature. Excessive sympathetic and parasympathetic stimulation causes severe perspiration, severe vasoconstriction of medium sized arterioles, myocardial dysfunction and pulmonary edema. About 20 years ago treatment of scorpion sting was symptomatic and consisted of inj. Atropine for perspiration and inj. lasix and steroids for pulmonary edema. In the last 15 years, with better understanding of pathophysiology, the treatment is now directed towards correcting hormonal imbalance. Insulin allows the incorporation of fatty acids into triglycerides in the liver and in adipose tissues. Glucose infusion along with insulin suppresses fat mobilization 5, 6,13 by favoring re-esterification. The alpha blocker treatment is directed towards neutralizing the effects of over-stimulated autonomic nervous system. Prazosin is an alpha adrenoreceptor antagonist 17 and stimulates insulin secretion. The results in this study confirm that scorpion antivenom directly neutralizes the venom in the circulation as well as present at the other body compartments. In an experimental study after administration of intravenous Tc-99m labeled venom, the venom was found in the blood (28%), muscle (30%), bone (13%), kidney (12%), and liver (11%) within 5 minutes. The labeled venom was excreted through renal and hepatobiliary pathways. The maximum renal uptake of 32% at 30 minutes dropped to 22% at 3 hours, indicating that clearance of labeled venom from the kidney is slow. 10 The scorpion venom has a half-life of 24 hours, indicating a slow elimination with the long mean residence time of 33.7 hours in the body and 26 hours in the peripheral compartments. 11 These findings are very well corroborated in human beings. As the venom stays in the body for more than 36 hours, neutralizing the venom and removing the root cause of pathophysiology should be the first and only line of treatment. The majority of investigators 11-15,18 consider antivenom is the only specific treatment for scorpion stings. Other investigators 4,17 however questioned the effectiveness of the antivenom. The opinions and conclusions presented were based on individualized clinical observation in a given population that would be influenced by availability and potency of the antivenom, the dosage, the route and time of administration, the lethality and venom yield of the scorpion under study and the use of adjunctive or alternative therapy. The improvement after injecting AScVS is rapid and is seen within 1 or 2 hours. 85% cases showed complete recovery within 12 hours. The mean recovery time with antivenin is 10 hours. The recovery time with Prazosin is hours (mean 27 hrs.) and close monitoring of cardiac and pulmonary status is necessary for 2 days as patient can develop pulmonary edema even after administration of prazocin. 17 The long half life of scorpion venom in the body explains the development of pulmonary edema even after administration of Prazosin and indicates the importance of neutralization of scorpion venom by antivenin. The aim of the study was to see efficacy of AScVS. We were using insulin-glucose and alpha blocker therapy in the absence of AScVS and our results were similar as reported in the literature. We found a appreciable reduction in the morbidity period of critically ill patients after using AScVS. In the present study also 11 cases showed slow recovery with alpha blocker therapy and recovery was hastened after AScVS confirming superiority of the therapy and supporting experimental observations. The only argument against antivenom is allergic reaction to foreign protein but clinically as well as theoretically it does not hold true in case of AScVS. In the present study and a clinical field trial of 203 patients 15 not a single anaphylactic reaction was observed. Scorpion venom causes excessive amount of outpouring of adrenaline which in turn causes severe vasoconstriction. An anaphylactic reaction results in severe vasodilatation and its antidote is adrenaline. In patients of scorpion envenoming syndrome due to excessive outpouring of adrenaline already in circulation it is unlikely that scorpion antivenom will ever cause severe anaphylactic reaction. AScVS is species specific and prepared from scorpion venom collected from scorpion (Mesobuthus tamulus concanesis, Pocock - earlier called Buthus tamulus) of coastal Maharashtra. Severe local pain only, at the site of sting, suggests that there is no systemic involvement. The symptom of increasing intensity of pain in an earlier subject without pain at the site of sting suggests improvement from systemic manifestations. In the present study it was found that pediatric age group is more susceptible to scorpion envenoming syndrome but at the same time complete recovery is also very fast after injecting AScVS in children. It is concluded that AScVS therapy directly neutralizes the venom in the circulation and other body compartments. Anaphylactic reaction is not seen and seems unlikely. It is rational, effective and safe method of therapy in severe scorpion envenoming syndrome. Further multicentre randomized clinical trials are necessary to confirm the superiority of AScVS therapy JAPI VOL. 54 APRIL 2006
5 REFERENCES 1. Bhaskara Reddy D, Suvarnakumari G. Fatal cases of scorpion sting. Autopsy study of seven cases. Clinician 1972;36: Hering SE. Jurca, M. Vichi F, Azevedo-marques MM, Cupo P. Reversible cardiomyopathy in patients with severe scorpion envenoming by Tityus serrulatus: evolution of enzymatic, electrocarediographic and echocardiographic alterations. Ann Trop Paediatr 1993;13: Amaral CFS, Rezende NA. Both cardiogenic and noncardiogenic factors are involved in the pathogenesis of pulmonary edema after scorpion envenoming. Toxicon 1997;35: Gueron M, Ilias R, Sofer S. The management of scorpion envenoming syndrome. Toxicon 1993;31: Radhakrishnamurthy K. The scorpion envenoming syndrome. J Venom Anim Toxins 2000;6: Yugandhar B, RadhaKrishna Murthy K, Sattar SA. Insulin administration in severe scorpion envenoming. J Venom Anim Toxins 1999;57: Radhakrishnamurthy K. Investigations of cardiac sarcolemmal ATPase activity in rabbits with acute myocarditis produced by scorpion (buthus tamulus) venom. Jpn Heart J 1982;23: Radhakrishnamurthy K, Anita AG. Reduced insulin secretion in acute myocarditis produced by scorpion (buthus tamulus) venom. Indian Heart J 1986;38: Radhakrishnamurthy K, Haghnazari L. Blood levels of glucagon, cortisol and insulin following scorpion (Mesobuthus tamulus concanesis Pocock) envenoming in dogs. J Venom Anim Toxins 1999;5: Murugesan S, Radhakrishnamurthy k, Noronha OPD, Samuel AM. 99m Tc-scorpion venom: labeling, biodistribution and scinti imaging. J Venom Anim Toxins 1999;5: Ismail M. The scorpion envenoming syndrome Toxicon 1995;33: Kankonkar RC, Radhakrishnamurthy K, Zare AM, Malathi A, Bala Subramaniam P, Yeolekar ME. Reversal of cardiovascular and haemodynamic disturbances by scorpion antivenin administration in myocarditis due to envenomation by Indian red scorpion. (Buthidae family). Venom Rec Adv Toxinol Res 1992;2: Radhakrishnamurthy k, Vakil AE, Yeolekar ME, Vakil YE. Reversal metabolic and electrocardiographic changes by scorpion antivenin administration in experimental myocarditis induced by Indian red scorpion (Buthidae family) venom. Rec Adv Toxinol Res1992;2: Radhakrishnamurthy K, Dubey AS, Zare Abbas, Haghnzari L, Investigations on the role of insulin and scorpion antivenom in scorpion envenoming syndrome. JVenom Anim Toxins incl Trop Dis 2003;9: Taherbhai M. A report on clinical field trials of antiscorpion venom serum conducted in three districts of Maharashtra, viz. Thane, Raigad and Ratnagiri ( Report submitted to Government of Maharashtra). 16. Kankonkar RC, Kulkarni DG, Hullikavi CB. Preparation of potent antiscorpion venom serum against the venom of the scorpion (Buthus tamulus) J Post graduate Med 1998; 44: Bawaskar HS, Bawaskar PH. Prazocin therapy and scorpion envenomation. JAPI 2000; 48: Freire-Maia L, De Matos IM. Heparin or PAF antagonist (BN-52021) prevents the acute pulmonary edema induced by Tityus Serrulatus scorpion venom in the rat. Toxicon 1993;31: Announcement KAPICON th Annual Conference of API - Karnataka Chapter, 26th-28th May Convention Centre, NIMHANS, Bangalore. For registration and further details, please contact: Dr. V. Channaraya, Bharathi Nursing Home, 42/77, South End Road, Basavanagudi, Bangalore Tel. : / ; Mobile : bangalorekapicon2006@yahoo.co.in JAPI VOL. 54 APRIL
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