- Research article
- Open Access
- Open Peer Review
Acute toluene intoxication–clinical presentation, management and prognosis: a prospective observational study
© Camara-Lemarroy et al. 2015
- Received: 3 August 2014
- Accepted: 29 June 2015
- Published: 18 August 2015
Toluene is one of the most widely abused inhaled drugs due to its acute neurologic effects including euphoria and subsequent depression. However, dangerous metabolic abnormalities are associated to acute toluene intoxication. It has been previously reported that rhabdomyolysis and acute hepatorenal injury could be hallmarks of the condition, and could constitute risk factors for poor outcomes. The objective was to describe the clinical presentation, to characterize the renal and liver abnormalities, the management and prognosis associated to acute toluene intoxication.
We prospectively assessed 20 patients that were admitted to a single center’s emergency department from September 2012 to June 2014 with clinical and metabolic alterations due to acute toluene intoxication.
The main clinical presentation consisted of weakness associated to severe hypokalemia and acidosis. Renal glomerular injury (proteinuria) is ubiquitous. Biliary tract injury (alkaline phosphatase and gamma-glutamyl transpeptidase elevations) disproportional to hepatocellular injury is common. Rhabdomyolysis occurred in 80 % of patients, probably due to hypokalemia and hypophosphatemia. There were three deaths, all female, and all associated with altered mental status, severe acidosis, hypokalemia and acute oliguric renal failure. The cause of death was in all cases due to cardiac rhythm abnormalities.
The hallmarks of acute toluene intoxication are hypokalemic paralysis and metabolic acidosis. Liver injury and rhabdomyolysis are common. On admission, altered mental status, renal failure, severe acidemia and female gender (not significant in our study, but present in all three deaths) could be associated with a poor outcome, and patients with these characteristics should be considered to be treated in an intensive care unit.
- Renal tubular acidosis
Toluene is present in many industrial solvents, and is responsible for environmental, accidental as well as intentional intoxications. It is the most widely abused inhaled volatile drug. It is easily accessible and used in the fabrication of various products such as paints, paint thinners, glues, adhesives and cleaning products . As a recreational drug, toluene is most often inhaled nasally (glue sniffing, huffing), and produces acute neurological effects such as euphoria followed by depression [5, 20]. However, almost all organs suffer some form of alteration . Toluene is metabolized by cytochrome p-450 into benzoic acid and hippuric acid, these are excreted by the kidney [8, 9]. The hallmarks of toluene intoxication are distal renal tubular acidosis type 1 (RTA-1), classically described as hyperchloremic with a normal anion-gap, as well as hypokalemia and muscle paralysis .
In a previous case series, we retrospectively studied 22 cases of acute toluene toxicity and found that toluene inhalation is associated with various severe metabolic alterations, including RTA-1, hypokalemic paralysis and profound metabolic acidemia . We also described elevations in alkaline phosphatase (ALP), and in a few patients, instances of rhabdomyolysis and proteinuria, but our data were insufficient to determine the relevance of these findings due to incomplete work-ups. No deaths were reported in that case series. In this prospective study, we sought to examine these alterations more thoroughly, to examine possible risk factors for poor outcome and the prognosis.
We included all patients presenting with acute toluene intoxication from September 2012 to June 2014. Patients were enrolled from the Emergency Department of the University Hospital “Dr. Jose E. González” in Monterrey, Mexico after the Ethics Committee of the Medical School of the Autonomous University of Nuevo Leon approved the study. Written informed consent was obtained from each patient. A case was considered when the chief complaint (characteristic odor and confirmation of it abuse by the patient) as well as when the metabolic alterations were attributed to toluene inhalation and after alternative diagnoses were ruled out. Cases were excluded if the patient was included in the previous case series (recurrences) . Each case was identified and assessed by 3 of the authors (RMR, CRCL and RRG).
We used the computer program SPSS, version 17.0 (SPSS Inc., Chicago, Ill., USA) for statistical analyses. We used Binary Logistic Regression using categorical co-variables with Confidence Intervals (CI) of 95 % for odds ratios (OR) to analyze the risk factors associated with survivors vs. non-survivors. We analyzed correlations between laboratory values using the Pearson correlation coefficient, and a p < 0.05 was considered as statistically significant.
Patient clinical and demographic data
20 (100 %)
8 (40 %)
12 (60 %)
Signs and symptoms
15 (75 %)
Altered mental status
5 (25 %)
4 (20 %)
119.1 ± 12.3
ST segment depression
10 (50 %)
AV block (1st degree)
6 (30 %)
4 (20 %)
4 (20 %)
The most common presentation was muscular weakness or paralysis, followed by altered mental status and gastrointestinal complaints including nausea, vomiting and abdominal pain (Table 1). All patients were tachycardic and tachypneic on admission. A characteristic “toluene” breath was perceptible in all patients.
Laboratory alterations associated with toluene toxicity
Value (mean ± SD)
Blood pH (venous)
7.14 ± 0.09 *
7.35 – 7.45
7.5 ± 4.1 *
24 – 28
Anion Gap (mmol/L)
16 ± 6.9 *
8 – 12
2.1 ± 1.3 *
3.6 – 5.1
136.3 ± 4.3
135 – 145
109.1 ± 7.2
101 – 111
3.3 ± 3.1
2.5 – 4.5
8.8 ± 1.2
8.4 – 10.2
2.9 ± 0.6 *
1.8 – 2.5
61.8 ± 59 *
10 – 42
40.4 ± 21
38 – 126
152.4 ± 68.9 *
5 – 37
103.9 ± 66.9 *
0.2 – 1
Total Bilirubin (mg/dL)
0.5 ± 0.2
4.0 – 11.0
16.9 ± 5.8 *
22 – 262
1544 ± 1864 *
4.6 – 8.0
6.0 ± 0.1
22 – 262
Urinary potassium (mmol/L)
34.5 ± 32.2
25 – 125
1.7 ± 1.9 *
0.6 – 1.4
24 h Urinary protein (g)
0.9 ± 0.4 *
0 – 0.15
Serum creatine-phosphokinase (CPK) levels were elevated in 16 cases, with a mean elevation of 6 times the upper normal limit (1544 ± 1864 U/L) and reaching 6236 U/L in one patient. Liver function tests were normal, except for ALP, which was elevated in 15 patients, with a mean of 152.4 ± 68.9 (range: 67–328 IU/L). Gamma-glutamyl transpeptidase (GGT) was elevated in all patients, with a mean of 103.9 ± 66.9 (range: 45–245 IU/L). Bilirubin was normal in all cases. Serum creatinine was elevated in 5 cases. EKG abnormalities were common (Table 1). Ten out of the 15 patients with elevated ALP and GGT underwent upper abdominal ultrasound. One patient had biliary sludge, but none had biliary tract stone disease or dilatation.
On correlation analysis, chloride levels, but not potassium levels, were correlated with blood pH (0.480, p = 0.04). CPK, ALP and GGT levels did not correlate with pH, potassium, phosphorus, or creatinine levels, but an expected strong correlation was found between ALP and GGT (0.816, p = 0.004). Creatinine levels were strongly and negatively correlated with blood pH (−0.711, p = 0.001).
Most patients (18/20) showed some level of metabolic acidosis and hypokalemia, with established evidence of renal potassium wasting (urine potassium >20 mmol/L). Mean urine pH was inappropriately high (pH 6 ± 0.1) and in 13 cases the anion gap as measured in the urine was normal, suggesting distal RTA-1. All patients had some degree of proteinuria, but none reached nephrotic-range proteinuria in 24-h urine collection.
On admission, all patients received parenteral potassium, with doses ranging from 400 to 800 mEq/day, depending on the severity of hypokalemia. Mean hospital stay was 4.4 ± 2.1 days, and time to resolution of both acidemia and hypokalemia was 41.72 ± 20 h. All patients received in-hospital psychiatric counselling and on discharge were referred to State-sponsored addiction clinics. Five out of the 20 patients had at least one readmission (3.2 ± 2.1 months) with identical presentations.
Characteristics of deceased patients on admission
Blood pH (venous)
Risk factors for death in non-survivors vs. survivors
Unadjusted OR (CI 95 %)
pH ≤ 7.15a
Creatinine ≥ 2.0 mg/dLa
Altered mental statusa
The most common clinical presentation in acute toluene intoxication was muscular weakness due to hypokalemia (hypokalemic paralysis, a life-threatening complication that can lead to respiratory depression), a finding supported by previous reports [6, 12, 36, 45]. In contrast to the previous retrospective case series , we observed an alarmingly high mortality rate (15 %), and considering we gathered a similar number of patients over only 22 months, the incidence of acute toluene intoxication appears to be higher than previously recognized. Alterations in mental status were relatively infrequent, but it is worth mentioning that all of the patients who died presented with this clinical feature. Other interesting similarities between all fatal cases were female sex, severe acidemia and renal failure on admission. These patients also had rhabdomyolysis, which could partially account for oliguric renal failure.
The mechanism of hypokalemic paralysis is an increased ratio between intra- and extracellular potassium concentrations, which alters membrane polarization and thereby alters the function of excitable tissues such as nerve and muscle . We found inappropriately high urinary levels of potassium in 15 patients (urine potassium >20 mmol/L), confirming that potassium wasting is another mechanism responsible for hypokalemia in toluene intoxication. Inadequate intake, gastrointestinal losses, intracellular shift and diuretic use are all common causes of hypokalemia and should be included in the differential diagnosis. Intracellular shift can be secondary to insulin excess, thyrotoxic periodic paralysis, among others. A limitation of our study is the lack of objective studies that validated the diagnosis of toluene intoxication, such as hippuric acid measurements in urine or the identification of other toluene byproducts in urine or serum this due to the fact that they were not assays available for these metabolites in our country. However, in our study, toluene intoxication diagnosis was established by a compatible clinical presentation and either the patients or relatives statement of intentional toluene inhalation. Besides toluene intoxication, other conditions may present with secondary RTA, hypokalemia and paralysis, such as Sjögren’s syndrome, hypothyroidism and systemic lupus erythematosus were discarded [15, 33, 34].
An association between distal RTA-1 and toluene inhalation was first described in 1974 . Since then, the acid base abnormalities caused by toluene intoxication have been well characterized. Distal RTA-1, classically described as a hyperchloremic metabolic acidosis with hypokalemia, is characterized by an inability to lower urine pH despite severe acidemia and minimal HCO3 wastage. The main proposed mechanisms in toluene-induced distal RTA-1 is an inability of the distal tubule to excrete hydrogen ions as ammonium, mediated by decreased proton conductance through the active conduction pathway , as well as overproduction of hippuric acid by toluene metabolism . Unfortunately, measurements of urinary fractional excretion of bicarbonate or urine chloride to determine urinary anion gap were not obtained. These investigations would be useful in understanding the underlying pathophysiology. Irrespective of the mechanisms involved, severe acidemia seems to be associated with a poor prognosis.
Toluene might cause both glomerular and tubular damage. Fanconi syndrome and hematuria have all been previously associated with toluene intoxication [14, 37, 41, 45]. We found that all patients showed some degree of proteinuria, which supports the hypothesis of Fanconi syndrome as characteristic of this entity, although 24 h levels of protein did not reach nephrotic-range levels. Cross-sectional studies of workers chronically exposed to toluene and other organic solvents found an increased urinary albumin excretion compared to controls . Among industrial solvents, toluene exposure was found to confer the greatest risk for progression to end-stage renal disease in patients with established glomerulonephritis . Toluene has also been associated to direct induction of acute tubular necrosis and acute oliguric renal failure . Vomiting, dehydration, tubular injury and rhabdomyolysis are all possible causes of acute renal failure in toluene intoxication, and this complication seems to carry an ominous prognosis.
Rhabdomyolysis, occurring either by direct toluene muscular injury or prolonged immobility , was another abnormality found in the majority of patients (80 %). None of our patients reported periods of immobility and the elevated values of CPK we observed, suggest direct muscular injury. The major causes of rhabdomyolysis include trauma, ischemia, drugs, toxins and metabolic disorders. Electrolyte disturbances, notably hypokalemia and hypophosphatemia, are known causes of rhabdomyolysis that might play important roles in the setting of toluene intoxication. Muscular phosphate depletion in severe hypophosphatemia impairs the biochemical pathways of ATP production and alters the affinity of oxygen for haemoglobin in erythrocytes, also leading to muscle injury [18, 31].
Frank rhabdomyolysis is thought to occur mainly when serum potassium levels are < 2.0 mmol/L [18, 32]. In our series, the 12 patients presenting with a serum potassium < 2.0 mmol/L, all had elevated CPK, whereas serum potassium levels were > 2.0 mmol/L in all 4 patients with normal CPK values. Hypophosphatemia was also ubiquitous in patients with rhabdomyolysis. Acidosis itself has been proposed as a contributing factor in the development of rhabdomyolysis in hypokalemia [16, 26], but in vivo animal studies failed to show that either chronic or acute acidosis increases myoglobin renal toxicity . Therefore, direct toluene muscular injury and electrolyte abnormalities appear to be the main causes of rhabdomyolysis in acute toluene intoxication.
Chronic toluene abuse has been associated with liver damage characterized by increases in transaminases and ALP [10, 11]. In our previous series, the most common alteration in liver function tests was an elevated ALP, but GGT levels were not measured and diagnostic imaging procedures to study the biliary tract were not done. Although there is evidence that chronic glue sniffing and severe acidosis (including RTA-1) are associated with osteomalacia and increased bone resorption (; Fulop et al., 2004; ), it is unlikely that elevated levels of ALP are originated from bone in toluene intoxication. First of all, in both non-toluene causes of RTA-1 (Sjögren’s syndrome) and severe acidosis (diabetic ketoacidosis), ALP levels have actually been found to be decreased [21, 48]. Serum calcium levels were also normal. Moreover, we found that GGT, a more specific marker of biliary tract injury, was consistently elevated, in addition to the absence of concomitant alterations in ultrasound findings or elevations in serum total bilirubin levels. These findings suggest that toluene leads to direct biliary tract injury. Interestingly, ALP was not elevated and GGT was only mildly elevated in those patients who died. Liver injury in acute toluene intoxication appears to be mild and not to contribute to mortality.
The hepatotoxic potential of toluene has been recognized for some time. In 1971, O’Brien et al. described the case of a glue sniffer who was admitted with renal and hepatic failure and persisted with elevated ALP levels after 7 days of supportive treatment . In 102 patients exposed to car paint, none showed alterations in any liver enzyme, including GGT and ALP . However, animal studies have conclusively established the hepatotoxic effects of toluene inhalation. Subacute toluene exposure leads to liver balloon degeneration and liver function test abnormalities trough a variety of mechanisms, including increased oxidative stress and CYP2E1 dependent chlorzoxazone hydroxylation [38, 47]. Interestingly, in a rat study of toluene exposure in breathing air for a period of 4 weeks, the only liver abnormality found was increased ALP . This is consistent with reports of increased ALP as the only liver alteration found in volatile-substance abusing street children (Olgar et al., 2008), as well as with our results.
Arrhythmia , ST wave changes related to hypokalemia, and even acute myocardial infarction have been described in association with toluene intoxication . Severe hypokalemia decreases conduction velocity, increases automaticity and shortens the refractory period, leading to ST wave changes, atrioventricular block and cardiac arrest . Chronic toluene abusers also have longer QT and corrected QT wave duration and dispersion compared to controls . The development of cardiac arrhythmias is indeed the principal cause of death following inhalant abuse . Severe acidosis could have contributed to refractory cardiac arrest. Cardiovascular monitoring and urgent correction of electrolytic and metabolic alterations are critical to prevent cardiac complications.
There is evidence suggesting that the female sex demonstrates distinct electrocardiographic patterns of ventricular repolarization associated with a longer rate-corrected QT interval, in both humans and animals . Androgen deficiency could account for these changes, as it leads to alterations in rectifier potassium and calcium current densities in ventricular repolarization that provokes a prolongation of action potential and QTc interval [28, 30]. These hormonal differences make women more susceptible to drug-induced arrhythmia such as Long QT syndrome, Torsade de Pointes, among others [1, 30]. We speculate that this could account for the exclusively female mortality due to conduction defects we observed in this study.
The treatment of acute toluene toxicity consists in correction of the electrolytic and acid base alterations. Aggressive potassium replacement, hydration and close monitoring of the cardiac rhythm are essential [2, 3]. Respiratory depression due to paralysis is rare, and if present, it requires prompt intubation and mechanical ventilation. Management of hypokalemia should follow published guidelines [23, 49], and large doses are often needed. In our experience, the placing of a central line is essential for adequate potassium repletion.
On the basis of our findings, specific recommendations can be made. Patients should be evaluated for rhabdomyolysis. Acute oliguric renal failure should be treated aggressively and in case of nonreversal, dialysis might be promptly considered . Acute liver injury does not appear to be clinically relevant. Urgent cardiologic consultation and evaluation are needed in most cases. The role of bicarbonate therapy remains unclear, and even though a specific recommendation cannot be made in severe cases its use might be considered . After stabilization, great care should be placed on preventive measures, including patient education, rehabilitation and follow-up.
Toluene intoxication due to intentional inhalation is a common admission diagnosis in Mexico and it can lead to death. The acute neurological symptoms are accompanied by severe metabolic alterations, as well as organ injury and dysfunction. The hallmarks of toluene intoxication are hypokalemic paralysis and metabolic acidosis. Liver injury and rhabdomyolysis are common. Altered mental state on admission, renal failure, severe acidemia and female gender could be associated with a poor outcome (not significant in our study), and patients with these characteristics should be treated in an intensive care unit. Further studies should establish an optimal treatment regimen, and great effort should be placed in preventive measures.
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