Risks of anaesthesia
Your anaesthetist is present throughout the procedure, and aims to prevent and treat adverse reactions and complications immediately and effectively. There are however risks associated with anaesthesia and despite vigilance, best anaesthetic practice and preventative measures, complications may still arise.
We therefore discuss some of the more common and more serious complications below. A more complete list with precise statistics on complications is available on request.
General risks:
Complications can occur at injection sites, including bruising, bleeding, infection, nerve injury, scarring or even limb loss in the worst cases.
Injections in the neck, shoulder and chest may cause a puncture of the lung leading to air collecting in the chest cavity outside the lung (pneumothorax), causing chest pain and shortness of breath. It necessitates the placement of a tube between the ribs inside the chest to remove the air.
Nerve injury caused by positioning on the theatre table may occur, which can lead to altered touch sense, partial paralysis or vision loss.
Sensitivity to, or side effects of medications administered can lead to nausea, vomiting, itching and rashes. Serious allergic reactions may occur which can lead to asthma, low blood pressure or even heart and circulation arrest.
It may become necessary to administer blood or blood products and this may cause complications, including serious incompatibility reactions and transmission of infections (including hepatitis, HIV and mad cow disease).
Occlusion of blood vessels by blood clots, which can lead to shortness of breath, chest pain, or even heart and circulation arrest, may occur.
Risks of general anaesthesia:
General anaesthesia may cause nausea and vomiting.
Support of the airway by intubation or laryngeal mask may cause sore throat. Intubation may lead to tooth damage or even tooth loss. The throat, vocal cords or airways may also be damaged leading to difficulty in swallowing, hoarseness or difficulty of breathing.
Malignant hyperthermia is a rare inherited disease that is triggered by anaesthetic gases and agents. It necessitates immediate intensive care treatment.
Awareness under anaesthesia may occur.
Risks of regional anaesthesia:
Regional anaesthesia may fail resulting in pain and sensation.
After spinal or epidural anaesthesia your legs will be weak and numb, limiting your mobility, and you may have difficulty urinating which necessitates the placement of a catheter in your bladder. This weakness may spread to your arms and breathing muscles requiring assisted breathing.
Your blood pressure may drop after spinal or epidural anaesthesia, but this is usually easily treated.
Severe headache is a known complication after spinals and epidurals and is usually treatable. Backache may occur after spinals or epidurals. During and after pregnancy backache is very common, but rarely caused by epidurals or spinals.
Limb blocks can cause nerves other than those intended to be blocked causing hoarseness, drooping of the eyelids or difficulty breathing, but this usually wears off along with the block.
Eye blocks may rarely lead to blindness.
All regional anaesthetics can cause direct injury to, bleeding in, inflammation or infection of the spinal cord or nerves leading to sensation loss and paralysis of the specific body part, incontinence, impotence and in the worst cases quadriplegia.