ESB stands for electrical stimulation of the brain, a medical technique that uses controlled electrical pulses to activate or inhibit specific brain regions. It plays a growing role in treating neurological and psychiatric conditions, from Parkinson’s disease to severe depression. In a separate medical context, ESB can also refer to an endoscopic (or nasal) septal button, a small silicone device placed in the nose to close a hole in the nasal septum.
How Electrical Brain Stimulation Works
At its core, ESB delivers small electrical currents to nerve cells, causing them to fire or quiet down depending on the settings. The electricity can reach the brain in two ways: directly, through electrodes surgically implanted into specific brain areas, or indirectly, through electrodes or magnetic coils placed on the scalp. Implanted systems send pulses deep into targeted circuits. Scalp-based methods pass electromagnetic energy through the skull, generating weak currents that stimulate neurons in a broader region near the surface.
The exact reason these pulses help remains an open question. The leading theory is that electrical stimulation “resets” malfunctioning neural networks, essentially overriding abnormal patterns of brain activity that produce symptoms like tremor, seizures, or persistent low mood. Clinicians can adjust the frequency, amplitude, and location of the pulses to fine-tune the effect for each patient.
Conditions Treated With Brain Stimulation
Deep brain stimulation (DBS), the most well-known implanted form of ESB, is used primarily for Parkinson’s disease. Electrodes placed in specific deep-brain structures can dramatically reduce tremor, stiffness, and slow movement. The same technology treats dystonia (involuntary muscle contractions), chronic pain, and certain forms of epilepsy that don’t respond to medication.
On the psychiatric side, brain stimulation therapies target severe, treatment-resistant depression and, in some cases, schizophrenia. Electroconvulsive therapy (ECT), a noninvasive form that briefly induces seizure activity, remains one of the most effective options for depression that hasn’t responded to other treatments. Newer scalp-based approaches use rapidly pulsing magnetic fields to stimulate nerve cells without surgery, offering a less invasive alternative for some patients.
ESB During Brain Surgery
Surgeons also use ESB as a mapping tool during operations to remove brain tumors or seizure-causing tissue. Called electrocortical stimulation, this technique is considered the gold standard for locating critical brain areas in real time. While the patient is awake on the operating table, the surgeon touches a small stimulator to the exposed brain surface and asks the patient to speak, move a hand, or report any sensations. If stimulating a spot disrupts speech or triggers involuntary movement, the surgeon knows that tissue must be preserved. This allows for maximum removal of diseased tissue while protecting essential functions like language and motor control.
What the DBS Procedure Looks Like
For patients receiving an implanted DBS system, the process unfolds over weeks to months. Surgery places thin electrodes into the targeted brain region and connects them to a battery-powered pulse generator, typically implanted under the skin near the collarbone. Recovery from the procedure itself involves about a week or two of facial swelling, up to a month of tenderness or numbness near the incision sites, and bruising that fades gradually.
Some patients notice an immediate improvement in symptoms right after surgery. This “honeymoon” effect can last days to weeks but is temporary. The real programming begins about a month after the pulse generator is placed, when a clinician turns on the device and starts calibrating settings. Finding the right combination of stimulation parameters often takes several sessions spaced a month apart. After that, adjustments typically happen every six months. Some patients also benefit from physical or speech therapy during this tuning period to get the best possible results.
Risks and Side Effects of Implanted Stimulation
Implanted brain stimulation is not risk-free. A long-term study of DBS patients found that neurological side effects were the most common, with gait disturbances and speech problems topping the list. Psychiatric side effects came second, affecting roughly 40% of patients and most often showing up as depression or mild cognitive changes. Falling risk is especially high in the weeks immediately after surgery.
Most side effects are mild and reversible, meaning they can be corrected by adjusting stimulation settings or resolved over time. In a smaller fraction of patients, roughly 23% of those receiving stimulation for Parkinson’s disease in one analysis, effects like impaired speech, gait changes, weight gain, or cognitive decline persisted and could not be fully reversed. Severe, irreversible outcomes were rare but documented, including significant weight gain (over 20 kg in one case) and, in isolated instances, worsening depression. The risk profile varies by the brain target being stimulated. Stimulation for dystonia, for example, carried negligible side effects in the same study.
The Other ESB: Nasal Septal Buttons
In ear, nose, and throat medicine, ESB refers to an endoscopic septal button, a small prosthesis used to close a perforation (hole) in the nasal septum. These perforations can cause nosebleeds, a whistling sound during breathing, crusting, and nasal obstruction. Surgery to repair them is complex and not always successful, so a septal button offers a simpler alternative.
Modern septal buttons are made of medical-grade silicone and come in sizes as small as 2 by 10 mm, designed to snap or magnetically couple through the perforation to seal it from both sides. The procedure is typically done in a day-surgery setting under local anesthesia. In a study of 15 patients, button insertion reduced nosebleeds, eliminated the whistling sound, and cut down on crusting and obstruction. Newer button designs made of softer, more flexible silicone conform better to the septum and are well tolerated long-term. The approach is not suitable for everyone: active infections, autoimmune conditions affecting the septum, tumors, or extremely large perforations are contraindications.