Reversible Adrenal Hyperplasia Associated with Chronic Etomidate Use: A Case Report with 3-Year Radiological Follow-Up

The human body maintains a delicate balance of hormones, chemical messengers that regulate everything from energy levels to blood pressure. Among the most critical of these are the adrenal glands, two small, triangular organs sitting atop the kidneys. Their job is to produce cortisol, a hormone that helps the body manage stress, and aldosterone, which controls salt and water balance. To keep this system running smoothly, the brain constantly monitors hormone levels and sends signals to the adrenal glands to adjust production. Sometimes, however, an external substance can interfere with this process. One such substance is etomidate, a medication typically used by anesthesiologists to induce sleep before surgery. It works by temporarily blocking a specific enzyme inside the adrenal glands, essentially putting a pause button on the production of cortisol. While this effect is usually short-lived and harmless in a hospital setting, a new and troubling trend has emerged: the use of illicit electronic cigarettes containing etomidate. When inhaled repeatedly over years, this drug can trick the body into thinking it is in a state of chronic stress, causing the adrenal glands to grow larger in a desperate attempt to produce enough hormones.

For a long time, doctors knew that this drug could cause the adrenal glands to swell, but they did not know if the damage was permanent. The central question was whether the glands would return to their normal size and function once the drug was removed, or if the enlargement was a lasting scar on the body. This uncertainty made it difficult to distinguish between a temporary reaction to a drug and a rare, inherited genetic disorder that causes similar symptoms. A team of researchers in Guangzhou, China, decided to answer this question by following a single patient over a period of three years, documenting the journey from illness to recovery with detailed medical scans and blood tests.

The story begins with a thirty-three-year-old man who had been suffering from recurring weakness in his limbs for a decade. He would feel fine for a while, only to be struck by episodes of fatigue and weakness every few months. Over the years, doctors had found that his blood potassium levels were consistently low, a condition that explained his weakness, but they could not find the root cause. The patient had no family history of adrenal problems, and he had grown up normally, which made a genetic disorder unlikely. The breakthrough came when the patient revealed a hidden habit: for ten years, he had been inhaling a specific type of illicit electronic cigarette four to five times a week. These devices contained etomidate, a drug not meant for recreational use. The researchers realized that the chronic inhalation of this substance was the culprit. The drug was blocking the adrenal glands' ability to make cortisol, causing the brain to send constant, frantic signals to the glands to work harder. This overstimulation caused the glands to thicken and grow, a condition known as adrenal hyperplasia.

To confirm their suspicion, the medical team performed a series of tests. They found that the patient's blood pressure was high, and his levels of a stress hormone called ACTH were significantly elevated, while his cortisol levels were on the lower end of normal. A computerized tomography scan, or CT scan, provided the visual proof: both of his adrenal glands were noticeably thickened, measuring 9.3 millimeters on the right and 9.5 millimeters on the left. To ensure this was not a genetic condition, they analyzed his DNA and found no mutations in the genes responsible for adrenal disorders. The diagnosis was clear: the patient had acquired adrenal hyperplasia caused by the long-term use of etomidate-containing e-cigarettes. The treatment was straightforward but required discipline. The patient was advised to stop using the e-cigarettes immediately. He was given medication to control his blood pressure and potassium levels, which helped him feel better quickly, but the true test would be what happened over the next few years.

Three years later, the patient returned for a follow-up. He had successfully stopped using the e-cigarettes and had remained abstinent for the entire period. He was no longer taking any medication for his blood pressure or potassium, and he felt completely normal. When the doctors ran the same blood tests again, the results were striking. His potassium levels had returned to the normal range, and the elevated stress hormones had dropped back to healthy levels. The most significant finding, however, came from a repeat CT scan. The images showed that the adrenal glands had shrunk dramatically. The thickness on the right side had reduced to 3.9 millimeters, and the left side had reduced to 4.3 millimeters, bringing both back to a normal size. The swelling had almost entirely disappeared, and the glands looked healthy once again.

This case provides the first visual evidence that adrenal enlargement caused by etomidate is reversible. For years, it was unknown if the body could fully recover from such long-term chemical interference. The patient's journey demonstrates that once the drug is removed, the adrenal glands can heal themselves, returning to their original shape and function without the need for surgery or lifelong hormone replacement. The researchers noted that while they could not measure every specific chemical precursor in the blood due to testing limitations, the combination of the patient's history, the blood work, the genetic testing, and the dramatic shrinkage of the glands on the scan created a complete picture. This discovery is vital for doctors who encounter patients with similar symptoms. It suggests that when an adult presents with enlarged adrenal glands and low potassium, but has no family history of the condition, the cause might be a drug they are using rather than a genetic defect. By identifying the substance and stopping its use, patients can avoid unnecessary invasive procedures and allow their bodies to heal naturally. The case serves as a reminder that the body is resilient, capable of reversing significant physiological changes once the source of the stress is removed.