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Inhibition of Adrenal Steroidogenesis by the Anesthetic Etomidate

R. Lee Wagner, M.D., Paul F. White, Ph.D., M.D., Patricia B. Kan, M.D., Myer H. Rosenthal, M.D., and David Feldman, M.D.

N Engl J Med 1984; 310:1415-1421May 31, 1984DOI: 10.1056/NEJM198405313102202

Abstract
Abstract

The use of the intravenous anesthetic etomidate for prolonged sedation has been associated with low levels of plasma cortisol and increased mortality. We measured the cortisol and aldosterone responses to ACTH stimulation in five patients receiving etomidate, and we also studied the direct effects of etomidate on enzymes in the rat steroidogenic pathway. One patient who was receiving a 20-hour infusion of etomidate (1.3 to 1.5 mg per kilogram of body weight per hour) had marked adrenocortical suppression that was still evident four days after etomidate was discontinued. Four surgical patients receiving etomidate during their operations were all found to have adrenal suppression four hours after the operation; mean (±S.D.) increases in cortisol and aldosterone after ACTH stimulation were only 1.8±0.5 μg per deciliter and 0.5±1.1 ng per deciliter, respectively. In rat adrenal cells, etomidate produced a concentration-dependent blockade of the two mitochondrial cytochrome P-450–dependent enzymes, cholesterol-side-chain cleavage enzyme, and 11β-hydroxylase, without evident inhibition of the microsomal enzymes in the glucocorticoid pathway. Physicians should be aware that etomidate Inhibits adrenal steroidogenesis, and they should consider treating selected patients with corticosteroids if etomidate is used. (N Engl J Med 1984; 310:1415–21.)

Media in This Article

Figure 1,Steroid Responses to Serial ACTH-Stimulation Tests in a Patient Receiving an Infusion of Etomidate.
Figure 2Effect of Etomidate on Conversion of Steroidogenic Precursors in a Mitochondrial Preparation from Rat Adrenal Glands.
Article

ETOMIDATE is an intravenous sedative-hypnotic that has been used for the induction and maintenance of anesthesia and for prolonged sedation of critically ill patients. The drug is administered by either bolus injection or continuous infusion1 and is characterized by a rapid onset of action and recovery,2 excellent cardiovascular stability,3 and the absence of histamine release.4 Although only recently available in the United States, etomidate has gained wide acceptance in Furope as an anesthetic for patients with cardiovascular instability5 and as a sedative for ventilator-dependent patients.6

Recently, an intensive-care unit in England reported an increased mortality rate7 associated with low levels of plasma Cortisol8 , 9 in patients receiving prolonged sedation with etomidate. To evaluate this possible drug effect further, we performed serial ACTH-stimulation tests measuring Cortisol and aldosterone in one patient receiving etomidate for continuous sedation and in four patients receiving etomidate during cardiac or vascular surgery.

Etomidate is a substituted imidazole, as is the imidazole antifungal agent ketoconazole, which has been shown to suppress cortisol production in patients.10 We have recently shown this inhibitory effect to result from a blockade of mitochondrial cytochrome P-450–dependent enzymes.11 To ascertain whether the adrenocortical suppression in patients receiving etomidate was mediated by a similar mechanism, we studied the drug's effects on steroidogenesis in rat adrenal mitochondria and intact adrenal cells and compared the results with those obtained with ketoconazole.

Methods

Studies in Patients

Prolonged Etomidate Infusion for Sedation

Case 1, a 38-year-old man with a history of alcohol abuse, was admitted to another hospital with a productive cough and a left pleural effusion. When his pulmonary function rapidly worsened, he-was intubated and transferred to the intensive-care unit at Stanford University Hospital, where a diagnosis of viral pneumonia complicated by adult respiratory-distress syndrome and hemodynamic instability was made. Sedation was a major problem early in the hospitalization, with alcohol-withdrawal syndrome superimposed on severe respiratory impairment. Initially, 2.5 to 5 mg of diazepam every three hours and 2 mg each of morphine sulfate and pancuronium hourly were required to suppress agitation and facilitate controlled mechanical ventilation. On the second day in the intensive-care unit, etomidate (Amidate, Abbott, Chicago), 2 mg per milliliter dissolved in 35 per cent (vol/vol) propylene glycol, was administered by continuous intravenous infusion. Although etomidate (1.3 to 1.5 mg per kilogram of body weight per hour) produced effective sedation to control ventilation adequately, concern regarding propylene glycol toxicity prompted discontinuation of the infusion after 20 hours and a return to the initial sedation regimen for an additional three days (during which time a comparable degree of sedation was required). Subsequently, the patient improved and was ultimately discharged. ACTH-stimulation tests were performed before, during, and after the etomidate infusion, and plasma etomidate levels were measured during the infusion.

Etomidate for Cardiovascular Anesthesia

Pertinent clinical features of the four surgical patients studied (Cases 2 through 5) are shown in Table 1Table 1Demographic and Drug-Dosage Data on Patients Undergoing Cardiac (Cases 2 and 3) and Vascular (Cases 4 and 5) Surgery.. The patients had normal preoperative hepatic and renal function and no evidence of adrenal or pituitary dysfunction. All patients were premedicated with an opiate and an antihistamine, and anesthesia was induced with a combination of fentanyl and etomidate. Patients undergoing cardiac surgery were maintained with fentanyl, nitrous oxide, and supplemental doses of etomidate (5 to 10 mg). Patients undergoing carotid surgery were maintained with isoflurane and nitrous oxide. After their operations, all patients received morphine sulfate for pain and diazepam for sedation. The total etomidate dose ranged from 0.2 to 0.7 mg per kilogram. ACTH-stimulation tests were performed 4 and 24 hours after the last dose of etomidate was given.

Clinical Laboratory Studies

The rapid ACTH-stimulation test was performed by injecting 250 μg of synthetic 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 ACTH (Cortrosyn, Organon, West Orange, N.J.), as an intravenous bolus. Cortisol levels were determined in plasma at 0, 30, and 60 minutes, with use of a specific radioimmunoassay12 after column chromatography.13 Levels of 11-deoxycortisol and ACTH were measured by specific radioimmunoassays.13 , 14 These assays were performed by the Endocrine Metabolic Center, Oakland, Calif. Normal values for this laboratory are as follows: cortisol, 5 to 25 μg per deciliter (0.1 to 0.69 μmol per liter); 1l-deoxycortisol, <0.5 μg per deciliter (<0.02 μmol per liter); and ACTH, 10 to 71 pg per milliliter (2 to 16 pmol per liter). A normal cortisol response to ACTH is a rise of at least 7 μg per deciliter (0.2 μmol per liter) above the basal cortisol level at either 30 or 60 minutes.15 Aldosterone was measured by a specific radioimmunoassay16 at 0 and 60 minutes by Endocrine Sciences Laboratory, Tarzana, Calif. Normal aldosterone.values are 3 to 16 ng per deciliter (83 to 440 pmol per liter), and the normal rise in aldosterone after ACTH stimulation in this laboratory ranges from 7 to 33 ng per deciliter (190 to 910 pmol per liter). Plasma etomidate levels were determined with a modification of a method using high-performance liquid chromatography.17

In Vitro Studies

To evaluate the effect of etomidate on enzymes in the steroidogenic pathway, a series of experiments was performed in which each steroidogenic intermediate was supplied as substrate and conversion products were assayed. Rat adrenal glands lack 17-hydroxylase activity, and the natural glucocorticoid produced is cortieostcrone, not cortisol. To estimate inhibitory potency, several concentrations of etomidate were compared with vehicle-treated controls as well as with ketoconazole. [3H]Cholesterol and [3H]11-deoxycorticoster-one ([3H]DOC) were added to a mitochondria-rich fraction because cholesterol-side-chain cleavage enzyme and 11β-hydroxylase are intramitochondrial. Intact adrenal cells were used to examine the effect of etomidate on the nonmitochohdrial enzymes 3β-hydroxysleroid dehydrogenase, Δ5-3 oxosteroid isomerase, and 21-hydroxylase.

Steroidogenesis by Rat Adrenal Mitochondrial Fractions

Mitochondria-enriched fractions were prepared from rat adrenal glands by the method of Mason et al.18 An aliquot of this mitochondrial fraction was preincubated with etomidate at concentrations of 0.5, 1.0, 5.0, and 25 μg per milliliter, with ketoconazole at a concentration of 5 μg per milliliter, or with saline (control), all at 37°C for 15 minutes under an atmosphere of 95 per cent oxygen:5 per cent carbon dioxide. One microcurie of [3H]DOC (47 Ci per millimole) or [3H]cholesterol (47 Ci per millimole) was then added to start thereaction. The incubation was continued for an additional five minutes, and the experiment was terminated by the addition of Folch reagent (chloroform:methanol, 2:1 vol/vol). After an overnight extraction and Folch wash,19 the radioactive steroid products were analyzed by reverse-phase high-performance liquid chromatography as previously described.11

Steroidogenesis by Isolated Rat Adrenal Cells

Isolated adrenal cells were prepared by collagenase digestion of adrenal glands freshly removed from male rats as previously described.10 Cells were preincubated with the study drugs or saline for 15 minutes as described above, then 1 μCi of [3H]progesterone (53 Ci per millimole) or [3H]pregnenolone (19.3 Ci per millimole) was added as substrate, and the incubation continued for 20 minutes. The experiment was terminated, and the radioactive steroid products were analyzed by high-performance liquid chromatography as described above.

Materials

Crystalline etomidate and ketoconazole were obtained from Janssen Pharmaceutica (Beerse, Belgium), standard steroids were from Steraloids (Wilton, N.H.), and Radio-labeled steroids were from Amersham (Arlington Heights, I11.).

Results

Studies In Patients

Prolonged Etomidate Infusion

The results of serial ACTH-stimulation tests in Case 1 are summarized in Figure 1Figure 1,Steroid Responses to Serial ACTH-Stimulation Tests in a Patient Receiving an Infusion of Etomidate.. On the second day in the intensive-care unit (before etomidate), the unstimulated cortisol level was high (24 μg per deciliter [0.66 μmol per liter]), and the aldosterone level was low (1.3 ng per deciliter [36 pmol per liter]), presumably because of stress and intravenous saline administration, respectively. ACTH stimulation resulted in a doubling in the plasma cortisol level and a substantial rise in aldosterone level. On Day 3, during the etomidate infusion, the basal cortisol level was depressed to 4 μg per deciliter (0.1 μmol per liter). Results of the ACTH-stimulation test were clearly abnormal, with no incremental cortisol response and marked suppression of the aldosterone response. Although etomidate was discontinued on Day 3 after a 20-hour infusion period, the cortisol response to stimulation was still completely suppressed on Day 4 and only slightly improved on Day 5. The basal and ACTH-stimulated cortisol values on Day 7 were technically within normal limits, but markedly diminished as compared with the pre-etomidate pattern (Day 2). The aldosterone response remained suppressed through Day 7. The patient's clinical status was essentially unchanged over the five-day period during which adrenal function was assessed. In addition, there were no overt signs of acute adrenal insufficiency, as evidenced by changes in vasopressor requirements, electrolyte values, or routine blood tests.

Before etomidate administration, the level of the cortisol precursor 11-deoxycortisol was appropriately low,20 and the ratio of cortisol to 11-deoxycortisol was 100 (Fig. 1). During the etomidate infusion, there was an increase in the 11-deoxycortisol level, resulting in a ratio of cortisol to 11-deoxycortisol of 0.6. After etomidate, 11-deoxycortisol levels rose dramatically and remained elevated as late as Day 7 (four days after cessation of etomidate), with ratios of cortisol to 11-deoxycortisol slowly increasing to 2.

Plasma etomidate levels ranged from 360 to 540 ng per milliliter during the 20-hour etomidate infusion—levels within the hypnotic concentration range.21 , 22 One hour after the infusion was discontinued, the plasma etomidate level had fallen to 210 ng per milliliter.

Etomidate for Cardiovascular Anesthesia

Plasma cortisol and aldosterone levels were normal before surgery in four surgical patients. After surgery, four hours after etomidate was last administered, basal plasma levels of ACTH were elevated in all four patients (Table 2Table 2Cortisol and Aldosterone Responses to Postoperative 1–24ACTH Stimulation in Four Patients Receiving Etomidate for Induction or Maintenance of Anesthesia.). Despite this endogenous ACTH stimulus, cortisol and aldosterone values were moderately depressed. The response to exogenous ACTH stimulation was flat, with a mean (±S.D.) maximal increase for cortisol and aldosterone of only 1.8±0.5 μg per deciliter (0.05±0.01 μmol per liter) and 0.5±1.1 ng per deciliter (14±30 pmol per liter), respectively. Twenty-four hours after surgery a normal cortisol response and a probably normal aldosterone response to ACTH were seen in the two patients tested. There were no obvious signs of acute adrenal insufficiency (e.g., hypotension or hyperkalemia) in anypatient during the perioperative period.

In Vitro Studies

Adrenal Mitochondrial Fractions

The ability of etomidate to inhibit steroidogenesis was first examined in a mitochondria-rich fraction, with [3H]DOC and [3H]cholesterol as substrates. The conversion of [3H]DOC substrate to [3H]corticosterone by the rat mitochondrial enzyme 11β-hydroxylase is illustrated in the lower panel of Figure 2Figure 2Effect of Etomidate on Conversion of Steroidogenic Precursors in a Mitochondrial Preparation from Rat Adrenal Glands.. Under control conditions, mitochondria converted all available [3H]DOC to [3H]corticosterone. In contrast, the etomidate-treated mitochondria showed marked inhibition of [3H]corticosterone production and a large residual quantity of unconverted [3H]DOC substrate. The degree of inhibition was directly related to the etomidate concentration. Etomidate at 0.5 μg per milliliter (data not shown) was approximately equal to ketoconazole at 5 μg per milliliter in inhibiting 11β-hydroxylase, whereas etomidate at 5 μg per milliliter completely inhibited this enzyme.

The other mitochondrial cytochrome P-450 enzyme studied, cholesterol-side-chain cleavage enzyme, was also inhibited by etomidate in a concentration-dependent manner (Fig. 2, upper panel). In the presence of excess [3H]cholesterol substrate, control mitochondria converted the [3H]cholesterol to [3H]pregnenolone, and small amounts were subsequently metabolized to form [3H]progesterone, [3H]DOC, and [3H]corticosterone. Etomidate-treated mitochondria produced these steroids from [3H]cholesterol in smaller amounts. The degree of inhibition was again directly related to the concentration of etomidate. Etomidate at 1 μg per milliliter (data not shown) was slightly less potent than ketoconazole at 5 μg per milliliter in the inhibition of cholesterol-side-chain cleavage activity, and etomidate at 5 μg per milliliter completely blocked enzyme activity.

Isolated Adrenal Cells

Isolated whole adrenal cells were used to examine the effect of etomidate on other enzyme activities in the steroidogenic pathway. When [3H]progesterone was employed as a substrate in the whole-adrenal-cell preparation (Fig. 3Figure 3Effect of Etomidate on Conversion of Steroidogenic Precursors in Intact Rat Adrenal Cells., lower panel), etomidate did not inhibit conversion to [3H]DOC by the enzyme 21-hydroxylase. Similarly, when [3H]pregnenolone was the added substrate (Fig. 3, upper panel), conversion to [3H]progesterone by 3β-hydroxysteroid dehydrogenase and Δ5-3 oxosteroid isomerase was unaffected by etomidate. Etomidate concentrations of up to 25 μg per milliliter failed to block the conversion of either substrate to [3H]DOC (data not shown). In both experiments the expected blockade of the conversion of [3H]DOC to [3H]corticosterone by 11β-hydroxylase was again demonstrated by the accumulation of [3H]DOC in both the etomidate-treated and keto-conazole-treated cells. Under these conditions, the blockade was essentially complete at etomidate concentrations as low as 0.5 μg per milliliter.

Discussion

Our study confirms previous reports that prolonged infusions of etomidate depress cortisol production.9 The findings presented clearly show that the site of the inhibition is within the adrenal gland. The serial ACTH-stimulation tests in Case 1 demonstrate a marked suppression of adrenal steroidogenesis during etomidate infusion, followed by a gradual recovery of glucocorticoid production during the four days of observation after cessation of etomidate. The aldosterone response to ACTH was suppressed even on Day 7, four days after etomidate. Similarly, there was a continued abnormal elevation of the level of 11-deoxycortisol, the immediate precursor to cortisol, suggesting a continued partial blockade of 11β-hydroxylase four days after discontinuation of the etomidate infusion. Our data suggest a more prolonged inhibition of 11β-hydroxylase than of cholesterol-side-chain cleavage enzyme. Inhibition of cholesterol-side-chain cleavage activity blocks the initial step in steroidogenesis, thereby limiting production of all subsequent intermediates in the pathway. Inhibition of this enzyme may explain the relatively low 11-deoxycortisol level on Day 3. Later, increasing levels of 11-deoxycortisol suggest diminishing blockade at the cholesterol-side-chain cleavage site, with persistent inhibition of 11βhydroxylase. We have no data on whether etomidate also inhibits the 18-hydroxylase conversion of corticosterone to aldosterone. However, both the prolonged inhibition of aldosterone responsiveness to ACTH and the fact that 18-hydroxylase is a mitochondrial cytochrome P-450–dependent enzyme suggest this possibility.

In the presence of enzyme inhibition, it is important to use a specific assay for measuring plasma cortisol because accumulation of cortisol precursors (e.g., 11-deoxycortisol) could result in falsely elevated values when less specific techniques are used. In our Case 1 for example, a falsely elevated plasma cortisol level of 36 μg per deciliter (0.99 μmol per liter) was measured on Day 4 by a conventional competitive-protein-binding assay (transcortin), as compared with levels of 18 μg of 11-deoxycortisol per deciliter (0.54 μmol per liter) and only 3 μg of cortisol per deciliter (0.08 μmol per liter) that were measured by highly specific radioimmunoassays.

In patients receiving etomidate during cardiac or vascular surgery, we found inhibitory effects on adrenal function four hours after administration of etomidate (Table 2). In a subsequent controlled study involving the use of either thiopental or etomidate for the induction of anesthesia,23 we found that the thio-pental (control) group had normal responsiveness to ACTH during the early postoperative period, with cortisol and aldosterone levels rising 20.1 ±8.1 μg per deciliter (0.554±0.22 μmol per liter) and 10.2±6.0 ng per deciliter (283± 166 pmol per liter), respectively. In the etomidate group, plasma cortisol and aldosterone levels failed to increase in response to ACTH administration. Although additional studies are needed to determine the magnitude and time course of adrenal suppression after various doses of etomidate, our case studies suggest that adrenal suppression resolved within 24 hours after a single dose of etomidate, whereas a prolonged infusion (20 hours) of etomidate produced adrenal suppression lasting at least four days.

Because etomidate has an imidazole structure, we suspected that its mechanism of steroid inhibition might be analogous to that of ketoconazole.11 Our data indicate that etomidate, like ketoconazole, blocks adrenal steroid synthesis by inhibiting the two mitochondrial cytochrome P-450–dependent enzymes in the glucocorticoid-synthetic pathway — namely, cholesterol-side-chain cleavage enzyme and 1lβ-hydroxylase. The blockade of glucocorticoid production appears limited to these two enzymes, since the in vitro experiments showed normal function of the three microsomal enzymes in the pathway. Although we did not measure sex-steroid production, we predict that the concentrations of these hormones will also be shown to be decreased, since they traverse the same initial steroidogenic pathway by means of cholesterol side-chain cleavage enzyme. Indeed, ketoconazole has been shown to inhibit testosterone production.24

In our experiments, etomidate was at least as potent as ketoconazole (on a mass basis) as an inhibitor of steroidogenesis. Although ketoconazole also binds to the glucocorticoid receptor and thereby exhibits antagonist activity at the target tissue,25 etomidate did not displace [3H]dexamethasone from glucocorticoid-receptor sites in rat kidney (data not shown). The ability of this imidazole-containing drug to inhibit mitochondrial cytochrome P-450–dependent enzymes and adrenal steroidogenesis suggests that this property may be present in other structurally related imidazole drugs. As suggested previously,10 , 11 , 24 imidazole drugs may be useful as therapeutic agents that could block steroidogenesis in Cushing's disease, hirsutism, and endocrine-dependent neoplasms (e.g., breast and prostate cancer). In addition, etomidate and other imidazole-containing drugs may inhibit hepatic cytochrome P-450 enzymes that are involved in drug metabolism and detoxification.

The clinical implications of the demonstrated effect of etomidate on steroidogenesis are unclear. Prevention of the glucocorticoid response to surgery during the perioperative period is considered a therapeutic goal by some anesthesiologists.26 On the other hand, it is well accepted that patients with adrenocortical insufficiency require glucocorticoid supplementation during surgery.27 In addition, acute adrenal failure with addisonian crisis may supervene when patients with limited adrenal reserve undergo severe stress.27 We are unaware of any reports of acute adrenal insufficiency after surgery in which etomidate has been a component of the anesthesia. Interestingly, in a patient receiving a prolonged infusion of etomidate, hypotension developed that was unresponsive to vasopressor drugs but improved with the administration of a glucocorticoid.28 Although one intensive-care unit has reported a markedly increased mortality rate in patients receiving prolonged infusions of etomidate,7 others have been unable to confirm this observation.29 Our patients did not have obvious signs of adrenal insufficiency. However, they were being carefully maintained with respect to blood pressure and fluid and electrolyte balance, so that clinical signs of adrenal insufficiency may have been masked.

In conclusion, our data suggest that the use of etomidate is followed by biochemical evidence of cortisol suppression and impaired responsiveness of both cortisol and aldosterone to exogenous ACTH. Although patients may not have overt signs of adrenal insufficiency, we believe they have inadequate adrenal reserve and may be at increased risk if complications occur. Until the clinical implications of these findings are clarified, we think that physicians should be aware of this side effect of the drug and be prepared to treat postoperative adrenal insufficiency in patients receiving the anesthetic etomidate. If the drug is used in critically ill patients, corticosteroid supplementation may be required. Further studies are necessary to ascertain whether the risks of adrenal suppression outweigh the benefits of this otherwise useful anesthetic agent.

Note added in proof: Since submission of our paper, two subsequent reports30 , 31 have described clinical signs consistent with acute adrenal insufficiency in patients who bad blunted cortisol responses to ACTH while receiving etomidate. These reports are consistent with our findings and indicate that adrenal insufficiency may follow prolonged etomidate infusion.

Supported in part by grants (GM 28825 and Al 20409) from the National Institutes of Health. Dr. Kan is the recipient of a National Research Service Award (AM 06962) from the National Institutes of Health.

We are indebted to A. Scott Connelly, M.D., for allowing us to participate in the care of bis patients; to C. Philip Larson, M.D., for his helpful review of the manuscript; to E. Price Stover for performing the glucocorticoid-receptor-binding studies; and to Virginia Gibbons for assistance in the preparation of the manuscript.

Source Information

From the Departments of Anesthesia and Medicine, Stanford University School of Medicine, Stanford, Calif. Address reprint requests to Dr. Feldman at the Division of Endocrinology, Department of Medicine, Stanford University School of Medicine, Stanford, CA 94305.

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