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1996 Milroy MDMA Related Death Study
Text

Pathology of deaths associated with "ecstasy" and "eve" misuse,
by C.M. Milroy; J.C. Clark; A.R.W. Forrest
Journal of Clinical Pathology Vol 49, 1996; 149-153




INTRODUCTION

Recreational use of 3,4-methylenedioxymethylamphetamine (MDMA), more commonly known as "ecstasy" (and a variety of other names including "XTC", ~ or "E"), is now well established. In Britain upwards of 500 000 people are said to use the drug each week (Harris Poll (1992) for "Reportage", BBC2, 22 Jan 1993).

MDMA is a ring substituted amphetamine with psychoactive properties. First synthesised in 1914 from methylenedioxyamphetamine (MDA), itself a drug of misuse (known as the "love drug"), it has been used in psychotherapy and was originally used as an appetite suppressant. The drug has ceased to be used medicinally and is now an established part of the illegal drug scene. It is banned in most countries. In the UK it is a class A drug as defined in Schedule 2 of the Misuse of Drugs Act 1971. It has no medicinal use in the UK and cannot be prescribed.

As well as MDA and MDMA, another variant, methylenedioxyethylamphetamine (MDEA, known as "eve"), which is similarly proscribed, is commonly encountered. All have similar pharmacological effects. In the UK, MDMA is often taken by young people at discos and rave parties. Both involve dancing, but especially at the latter there is vigorous repetitive dancing in crowded rooms with a hot and humid atmosphere. The dangers of this activity are recognised to a certain extent as rooms to "chill out" are often available for people to rest in after periods of exertion. Toxic effects and the occasional death following ring substituted amphetamine misuse have been reported but postmortem data are lacking. 1-26 In this paper we report on deaths associated with ring substituted amphetamine misuse and detail the postmortem findings.


METHODS

Seven deaths have been investigated by the University of Sheffield Department of Forensic Pathology in the past three years, which were associated with ring substituted amphetamine misuse. One case has been reported previously.26 Case details are presented in table 1. All of the subjects were white men, between 20 and 25 years of age. Three of the victims collapsed at a rave or disco, two were found in bed, one in a collapsed state and one dead, one collapsed in the street, and one was admitted to hospital with progressive jaundice.

Only two of the men had documented hyperthermia, with temperatures of 440C and 39~50C. One of the deaths was thought to have been caused by water intoxication, the victim having drunk an estimated 14 litres of water in trying to quench the thirst that is frequently associated with ingestion of ring substituted amphetamines. None of the men were known intravenous drug abusers.

Full drug screening was performed on body fluids, including a screen for drugs of abuse. Screening by gas chromatography/mass spectroscopy was also performed.


RESULTS

Pathology
The pathologlcal and toxlcological data are summarised in table 1.


Liver
The liver showed dramatic changes. Necrosis was seen in all cases. In one case there was centrilobular and midzonal necrosis (fig 1). This patient survived for four days. In the other cases focal necrosis in zone 3 was present, with an acute inflammatory response surrounding necrotic hepatocytes (fig 2). Fatty change, sinusoidal dilatation and inflammation were also identified. No other hepatic pathology was identified in these cases. Postmortem virology was not done in these cases. In case 7 there was massive hepatic necrosis, with the liver only weighing 795 g at necropsy. Full viral screening was negative in this case. The livers were of normal size in the other cases.

Heart
Changes were seen in five of the seven hearts examined. Histologically, the changes ranged from contraction band necrosis to individual myocyte necrosis with a surrounding neutrophil and macrophage inflammatory response; the same changes as have been described in catecholamine induced myocardial injury (fig 3). In one case foci of fibrosis were identified in the heart of a man in whom traces of MDMA and MDA were found in the urine.

Brain
The brain of one of the cases of rapid death showed disseminated intravascular coagulation (DIC), oedema and degeneration of neurones, particularly apparent in the locus ceruleus. Two cases showed foci of haemorrhage (fig 4). One case showed severe cerebral oedema consistent with water intoxication and had additional occasional perivascular haemorrhages.

Other organs
Pulmonary infarction was seen in case 5. In two of the other rapid deaths intra-alveolar haemorrhage was present. In one case there was inhalation of gastric contents. In the patient who died of water intoxication there was complete necrosis of the pituitary gland. Severe cerebral oedema was present and the pituitary necrosis was probably a direct consequence of this as the blood supply was compromised. In two cases the kidneys were examined for myoglobin, which was not detected. No skeletal muscle damage was identified.


TOXICOLOGY

The toxicological data are shown in table 1. MDMA was found in five cases, varying from trace concentrations to 4~2 mg/l. MDEA was found in two cases, at concentrations of 3.5 and 0~187 mg/l. Amphetamines were detected in three cases at concentrations of 0~256, 0~453 and 1~4 mg/l. MDA was found in three cases, varying from trace concentrations to 8~5 mg/l. MDA is a metabolite of MDMA and MDEA, but may also be found as a constituent of "ecstasy" tablets, along with other pharmacological substances including amphetamines (vide infra). No opiates or other drugs associated with intravenous drug abuse were detected.


DISCUSSION

Ring substituted amphetamines (amphetamine derivatives) are taken because they give a feeling of euphoria and benevolence and heighten the sensations at raves and discos. However, when 29 volunteers took MDMA, as well as pleasant symptoms, all complained of undesirable effects which included loss of appetite, trismus and bruxism, nausea, muscle aches, stiffness, and ataxia.27 Sweating, tachycardia and hypertension, insomnia, and fatigue were also reported. More serious complications reported include hyperthermia, convulsions, other cardiac arrhythmias, rhabdomyolysis, disseminated intravascular coagulation, renal failure, hyponatraemia, hepatoxicity, pneumomediastinum, aplastic anaemia, cerebral infarction, cerebral haemorrhage, and cerebral venous sinus thrombosis. 1 26

In five of the cases reported here complications followed shortly after ingestion. Four of these deaths seem to be linked directly to the toxic effects of MDMA and MDEA. In the fifth case there was evidence of water intoxication, which followed the taking of "ecstasy". In this case, however, myocardial and liver pathology was identified which was similar to the other cases. The sixth case collapsed in the street. Myocardial fibrosis and foci of liver necrosis were identified and toxicology revealed traces of MDMA.

MDMA is believed to act on at least three neurotransmitter pathways, as does cocaine, but with MDMA the serotoninergic (5-hydroxy-tryptamine) pathway is principally affected, which would account for the more pronounced effect on mood. Cocaine acts chiefly on the dopaminergic system, which accounts for its greater addictive properties. MDMA also acts on the noradrenergic system. Serotonin plays a major role in thermoregulation and interference with this mechanism is believed to be the cause of the hyperthermia which arises as a complication of ring substituted amphetamine misuse. Stimulation of the noradrenergic system also probably contributes to hyperthermia.

Hyperthermia may account for many of the changes seen in deaths from ring substituted amphetamine misuse, although it is interesting to note that raised temperatures were only documented in two of our cases. The pathology of heatstroke has been reported in a number of papers. In the liver the most striking change is centrilobular necrosis. Sinusoidal congestion and dilatation, and portal and sinusoidal inflammation may be present. Fatty change has been reported occasionally. Cholestasis may be present, especially in fatal cases. Rubel and Ishak34 did not find liver necrosis as frequently as other authors. They examined the liver in 50 military recruits who had died of heatstroke. These men were predominantly white. Kew et a131 had found liver necrosis a common finding in black South African gold miners. The difference in frequency may be related to the fact that the gold miners work in very high environmental temperatures with over 90% humidity, conditions not dissimilar to some raves and discos. In the myocardium contraction band necrosis and small foci of necrosis with a mixed inflammatory infiltrate are seen. These features are also evident in catecholamine induced injury. In the brain ring haemorrhages and hypoxic changes have been described. The kidneys may show acute tubular necrosis and pulmonary haemorrhage is common.

The mechanism of damage in heatstroke is postulated to be caused by circulatory collapse and hypoxic damage, possibly combined with disseminated intravascular coagulopathy, which has been recorded in heatstroke,3637 and as a complication of MDMA and amphetamine ingestion.37 In the myocardium the damage may be related to catecholamine induced injury. These myocardial changes are also seen secondary to brain pathology, and contraction band necrosis may be seen in resuscitation, especially when catecholamines are used. Whilst these are alternative explanations for the changes seen, not everyone was resuscitated, and the myocardial changes are frequently seen, even in early deaths.

The pathological changes present in these deaths are the same as those seen in deaths from heatstroke. These changes provide further evidence that hyperthermia can cause death following misuse of ring substituted amphetamines. Evidence of disseminated intravascular coagulopathy was also present in the brain. These deaths may therefore be a complication of hyperthermia, DIC and shock. Some caution must be exercised, however, in ascribing a death from ring substituted amphetamine misuse to these mechanisms as a high temperature is not recorded in all cases, although hyperpyrexia may have been present at some time. In the seventh case death was caused by fulminant liver failure and postmortem examination revealed massive hepatic necrosis. All investigations for the cause of liver failure were negative. The young man admitted to regular and heavy ecstasy use, and this case is similar to cases described by Henry et al.7 There is increasing evidence that "ecstasy" is hepatotoxic, and liver changes have been reported following biopsy. 10 55

These changes, however, differed from those found in the acute deaths described above. Whether the damage is caused by an idiosyncratic reaction to MDMA, or a contaminant of the drug is unclear. Therefore, there seems to be a second mechanism for liver injury from ring substituted amphetamines unrelated to hyperthermia. Furthermore, the possibility that the myocardium may also be damaged by these drugs without documented hyperthermia is suggested by case 6 and other reports, where myocardial fibrosis has been reported following misuse of MDMA.3 Individual susceptibility to ring substituted amphetamines may be related to its metabolism in the liver. Abnormalities have been reported in demethylation in susceptible individuals, related to human debrisoquine hydroxylase (CYP2D6).38 Another problem for the recreational drug taker is the quality of the tablets they take. Examination of "ecstasy" tablets by one of the authors (ARWF) has shown that the contents of the tablets vary greatly, and may be a mixture of MDA, MDMA, MDEA, amphetamines, or no pharmacologically active substance; compounds such as potassium chlorate may also be found (table 2). With such material the possibility of toxic contaminants being present is evident.

The short term risks of "ecstasy" use are becoming increasingly more apparent and questions must be asked about the long term effects on the brain, liver and heart considering the pathology found in those who die.