Awake Craniotomy: A Modern Approach in Neurosurgery
Awake craniotomy (AC) represents a significant advancement in neurosurgical practice, offering a highly specialized approach for the treatment of brain tumours. Craniotomy surgery procedure enables surgeons to operate on tumours located in critical areas of the brain, regions responsible for vision, movement, speech, and other essential functions, while the patient remains awake and responsive.
By facilitating real-time feedback on neurological functions, awake craniotomy minimizes the risk of damage to vital brain areas and allows for greater surgical precision. This guide explains what craniotomy is and the procedure involved.
What Makes Awake Craniotomy Unique?
Generally, conventional brain surgeries are performed under general anesthesia. The patient remains unconscious throughout the surgical procedure. However, in awake craniotomy, the patient remains conscious during the procedure. The doctor asks the patient to perform certain tasks like moving limbs, speaking, or identifying objects.
This interaction enables the surgical team to accurately identify and preserve critical brain regions, thereby optimizing tumour removal and reducing the likelihood of post-operative neurological deficits.
Who is a Candidate for Awake Craniotomy?
Craniotomy surgery procedure is a highly selective procedure and is generally recommended for patients with tumours located in eloquent brain areas responsible for essential functions such as speech, movement, and cognition. Eligibility criteria include:
- Cooperation and Maturity
The patient must be able to understand the procedure and actively participate during intraoperative tasks.
- Emotional Stability
Patients suffering from emotional conditions such as severe anxiety, schizophrenia, or have a low pain tolerance may not be a fit candidate for awake craniotomy.
- Physical Health
Individuals who have a chronic cough or are suffering from obstructive sleep apnea may find it difficult to cope with the procedure.
Doctors performed a detailed evaluation of the patient before recommending awake craniotomy.
Preoperative Preparation
During the preparation for craniotomy surgery procedure, doctors follow a multidisciplinary approach. Neurosurgeons, neuropsychologists, anesthesiologists, and radiologists are all involved.
- Health and Mental Assessment
Doctors perform a detailed medical evaluation to ensure the patient is fit to undergo the surgical procedure. Along with this, a psychological assessment is also performed to understand if the patient is mentally ready.
- Practice Before Surgery
Patients have to perform certain tasks during surgery and they are trained for it beforehand. Imaging diagnosis is also performed, which includes MRI and assessment of body functions. These are done to map the tumour and the surrounding structures of the brain.
- Medication Changes
If the patient is already having anti-epileptic or blood pressure medications, the doctor may adjust these medicines for a brief period. To avoid seizures, benzodiazepines are usually recommended.
Surgical Procedure
Awake craniotomy is a procedure where a patient is usually put on mild sedation at the beginning. The surgeon positions the patient’s head and makes the first incision while the patient is still unconscious. Right after the patient’s brain is laid open, the anesthesiologist wakes the patient so that they can participate in intraoperative testing. This helps doctors understand which areas are safe to be operated on.
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Brain Mapping
Brain mapping is a critical component of awake craniotomy. Doctors perform this to map the brain and differentiate between tumour tissue and functional brain parts. The techniques involved are:
- Direct Electrical Stimulation (DES)
On specific brain parts, electrical stimulation is applied. This is done while the patient performs tasks TL ensure real-time identification of the concerned parts of the brain.
- Functional MRI (fMRI)
An MRI is conducted to understand the condition of the tumour or the underlying concern. It maps the active parts of the brain based on the blog flow pattern.
- Neuronavigation and Ultrasound
Through ultrasound and neuronavigation, the doctors look for real-time guidance. It also compensates for the anatomical changes during surgery.
Anesthesia Management
Anesthesia is given to the patient before the surgery begins. After some time when the brain is open, the patient regains consciousness to perform surgery-related tasks. Common approaches to anesthesia are:
- Conscious Sedation
In the initial steps of the surgery, the patient is given minimal sedation. During brain mapping, the patient gets back to full alertness
- Asleep-Awake-Asleep Technique
During the initial and the end of the procedure, the patient is under general anesthesia. Only for a short period of brain mapping, the patient regains consciousness.
Doctors conduct continuous monitoring to ensure the safety and comfort of the patient throughout the procedure.
Recovery After Surgery
Compared to conventional brain surgery, the recovery after craniotomy is faster. Most patients can experience the following recovery journey:
- Within 24-48 hours, patients resume eating and physical movement
- Within a few days, the patient gets back to routine activities
- Full recovery may take a few weeks after the surgery.
After surgery, patients may experience headaches, fatigue, and swelling. These are commonly managed with proper medication and rest. Follow-up is a must to ensure complete recovery.
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Advantages Over Traditional Surgery
Awake craniotomy can be beneficial in several ways:
- Better Tumor Removal
The real-time feedback during brain craniotomy allows removal of the tumor largely without damaging the main functional areas of the brain.
- Quicker Healing
Lesser use of general anesthesia results in shorter duration of hospitalisation for the patient.
- Minimum Possibility of Complications
There will be fewer anesthesia-related issues such as nausea and airway problems
When Is This Procedure Used?
Awake craniotomy is commonly recommended to patients suffering from a brain tumour. However, it can be suggested in several other conditions such as:
- Epilepsy surgery
- Parkinson’s disease
- Brain biopsies
Who Should Not Undergo Awake Craniotomy?
Some patients may not be fit for awake craniotomy. Doctors do not recommend AC in the following cases:
- Severe anxiety
- Physiological instability
- Cognitive impairment
- Obstructive sleep apnea
- Chronic cough
Potential Complications and Risks
Although awake craniotomy is generally safe, the surgery may involve certain risks. Common craniotomy risks are:
- Seizures
Some patients may experience seizures. However, these are short-term and manageable.
- Nausea and Vomiting
Vomiting or feeling nauseated is common among patients after the surgery. However, the doctor prescribes medications to control these effects.
- Pain or High BP
Experiencing pain can be common after the surgery. Some patients may also have high blood pressure due to anxiety. These are also properly managed by doctors.
Conclusion
With awake craniotomy, a neurosurgeon combines deep understanding, high-end equipment, and close cooperation with the patient. It allows the doctor to continuously monitor the patient’s neurologic status during surgery. Not only does this technique lead to better surgical results, but patients who undergo it are also generally able to return to a more normal, everyday life.
