Chapter 22: Cancer pain assessment and management
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Acupuncture
Background and definition
Acupuncture is a therapeutic technique that involves the insertion of fine needles into the skin and underlying tissues at specific points for therapeutic or preventive purposes (White et al. [233]). The use of acupuncture has been growing in popularity and it is now commonly used alongside conventional treatments for pain and symptom control in the cancer and palliative care setting (Filshie and Thompson [73]). Leng ([121]) carried out a survey into the use of acupuncture in the hospice and palliative care setting across the UK and found that 59% of centres were actively using acupuncture for symptom control.
The management of pain and nausea has improved significantly with the use of conventional medical treatments. However, there is a lack of management for other common symptoms of fatigue, anxiety and depression. As cancer patients will normally present with numerous symptoms it is ideal to address as many of these symptoms at once to ensure a positive outcome for the patient. Sagar and Capsulet ([198]) discussed that the use of complementary therapies to manage the wide spectrum of cancer patients’ symptoms can be beneficial. Lim et al. ([123]) compared the use of acupuncture with supportive care from a specialist nurse in managing patients’ symptoms. Out of the 42 patients surveyed they found a reduction in symptoms of 22% following acupuncture treatment compared with 14% following support care appointment. Hu et al. ([103]) performed a systematic review of 20 articles and found that acupuncture in combination with conventional analgesic treatment results in longer episodes of no pain, increased response time in pain relief, increase in length of analgesic duration, improved quality of life and reduction of analgesic side‐effects due to decrease in use.
Anatomy and physiology
Acupuncture has been used in China for over 2000 years; the history of Western medical acupuncture started in the 1970s when a medically qualified doctor took a rational, scientific approach to exploring acupuncture and its benefits (White et al. [233]). We still do not know exactly how acupuncture works but due to numerous scientific studies there is evidence to show that acupuncture works on the nervous system and the muscles.
Five mechanisms have been identified and these can overlap (White et al. [233]).
Local effects
The acupuncture needles activate action potentials in nerve fibres in the skin and muscle. Various substances are released as a result and this causes an increase in local blood flow. This can often be seen as a red mark around the acupuncture needle during treatment. The local effect can also cause an increase in the blood supply in the deeper tissue that can aid wound healing. It can also be used near an underactive salivary gland in the treatment of xerostomia (White et al. [233]) which can be a common side‐effect following radiotherapy.
Segmental effects
The action potentials activated by the local effects continue to travel up the nerve to the spinal cord and reduce the painful stimuli by reducing activity at the dorsal horn. This is the main mechanism by which acupuncture relieves pain.
Extrasegmental effects
This is a response in which the effect of acupuncture is not restricted to a single area. The action potentials continue to the brainstem; this then affects every segment of the spinal cord (White et al. [233]). This allows for the treatment of multiple symptoms, which is extremely useful for cancer patients as they often report a variety of different symptoms (Sagar and Capsulet [198]).
Central effects
Acupuncture affects other structures in the brain such as the hypothalamus and limbic system. In these areas acupuncture can have a regulatory effect; this can be used to treat nausea, hormone imbalances and drug addiction. These effects have been shown on MRI scans. This can be very effective in managing hot flushes following hormone treatment; it has been shown to reduce incidence of hot flushes by 50% (Hervik and Mjaland [97]).
Myofascial trigger point effect
People can experience pain due to ‘tight bands’ or ‘pressure/trigger points’ in their muscles. Acupuncture is effective in treating this pain; the needles are inserted directly into the painful area and often the patient experiences instant pain relief. It is thought that acupuncture was originally developed for this type of pain. There is limited evidence on the incidence of myofascial trigger points in cancer patients, however careful examination and palpation of the site of pain should be performed to identify the possibility (Hasuo et al. [92]).
Evidence‐based approaches
Acupuncture is now being used widely in the management of multiple symptoms in the cancer and supportive care setting. It has been shown to improve quality of life of patients through the improvement of one or multiple symptoms related to their cancer or treatment (Dean‐Clower et al. [49]). Towler et al. ([215]) looked at 17 systematic reviews into the effectiveness of acupuncture for symptom management in cancer patients. They found benefit was shown in the management of multiple symptoms and recommended its use in the control of symptoms when other treatments have failed.
Indications
Filshie et al. ([74]) list the following indications for the use of acupuncture in symptom management:
- pain acute and chronic (e.g. persistent pain following breast surgery)
- radiotherapy complications/side‐effects
- chemotherapy‐induced peripheral neuropathy
- joint pains secondary to aromatase inhibitors
- breathlessness
- nausea and vomiting
- hot flushes
- xerostomia
- anxiety
- fatigue.
Contraindications
Acupuncture is contraindicated in patients who:
- refuse, e.g. in cases of extreme needle phobia
- have pain originating from an unknown cause
- are unable to give informed consent or co‐operate with treatment
- have severe clotting dysfunction or who bruise spontaneously.
In addition needling should be avoided:
- directly onto a tumour nodule or into an area of ulceration
- in lymphoedematous limbs or limbs prone to lymphoedema
- in the ipsilateral arm in patients who have undergone axillary dissection (risk of development of swelling and lymphoedema after insertion of any needle)
- in areas of spinal instability due to potential risk of cord compression (due to acupuncture's muscle‐relaxing properties)
- into a prosthesis (could cause leakage of saline/silicone)
- over intracranial deficits following neurosurgery.
Caution should be taken with:
- patients who are underweight (not to needle too deeply over the chest wall)
- patients who are confused
- patients who are agitated
- patients with a metal allergy
- patients receiving anticoagulation therapy
- patients who are immunocompromised
- patients with peripheral vascular disease
- patients with bloodborne infections, e.g. HIV
- patients who are pregnant
- patients who are prone to keloid scar formation
- all cancer patients as they may be very sensitive to acupuncture, so close supervision is advised, especially during the first treatment.
Legal and professional issues
All acupuncture practitioners must have completed a recognized, validated, formal training course within their scope of professional practice (for example, the Foundation Course in Acupuncture provided by the British Medical Acupuncture Society [BMAS]). Any nurse who practises acupuncture should check with their union to ensure they have appropriate indemnity cover.
Pre‐procedural considerations
Equipment
Acupuncture needles consist of a shaft and a handle. The handle is made of either plastic or metal. The needles are single use, disposable and covered by a safety guide tube.
There are different dimensions of needles available:
- 0.25 or 0.30 mm diameter needles are standard
- 25 or 40 mm length needles are standard.
Assessment and recording tools
Record the patient's treatment in the hospital notes/hospital computer system (e.g. condition, acupuncture points used, outcome) (Figure 22.8).
Patient preparation
Patients should be treated in a comfortable well‐supported position on a couch, either lying down or sitting, with the facility to lie down quickly in case they feel faint during or after the procedure. A healthcare professional should remain with the patient throughout their first treatment as their reaction to acupuncture is unknown.
Consent
All patients must sign a consent form to agree to treatment. An example of a consent form to use can be found on the BMAS website (www.medical‐acupuncture.co.uk).
Procedure guideline 22.1
Acupuncture: preparation and administration
Post‐procedural considerations
If patients are having treatment in an outpatient setting, they can travel home immediately after treatment. If the patient feels dizzy/faint, they should rest and drink fluids until the feeling passes.
Complications
Acupuncture, when performed by a competent practitioner, is a very safe treatment. Macpherson et al. ([131]) found that in a study of 34,407 treatments there were 43 reports of mild adverse effects as a result of acupuncture and no serious event occurred. Complications can be categorized into three groups: mild, significant and serious (White et al. [233]).
Mild events
- Bleeding (more than a small drop) 3%.
- Exacerbation of symptoms 1–2%.
- Pain on insertion of needle 1%.
- Drowsiness 1%.
- Fainting less than 0.5%.
Significant events
These events are extremely rare and can include skin infections at insertion sites, peripheral nerve injury, exacerbation of asthma and seizures (commonly occur when the patient is treated sitting upright and then faints).
Serious events
- Pneumothorax: 54 cases reported caused by a practitioner with poor anatomical knowledge (Park et al. [166]).
- Cardiac tamponade: 9 cases reported.
- Damage to blood vessels, i.e. pseudoaneurysm: 10 reported cases.
- Brain/spinal cord injury: 12 reported cases.
- Infection: HIV (4 reported cases), hepatitis B (148 reported cases) caused by reuse of needles.