Guide to Pain Management in Low-Resource Settings
How can I treat sharp, stabbing pains?
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- Bu sahifa navigatsiya:
- How can I diagnose the cause of dyspareunia
- How can I help my patient with a painful vulva (vulvodynia)
- How can I help my patient with painful pelvic muscles
- When should I refer my patient with pelvic pain to a surgeon
- What are common barriers to eff ective pain management
- What should I ask at follow-up visits
- Guide to Pain Management in Low-Resource Settings Chapter 31 Pain Management Considerations
- Should you be concerned about prescribing pain killers in a pregnant or lactating woman
- What would be the ideal approach to pain management in pregnancy and lactation
- What would your advice be for Shillah and Alusine
- Are there any other analgesics that might be available when Shillah attends the large city hospital
How can I treat sharp, stabbing pains? Sharp, stabbing pains are usually a form of neuropathic pain. Treatment includes neuropathic pain medications (e.g., amitriptyline 5–25 mg in the early evening, gaba- pentin 100–1200 mg daily), regular sleep, regular exer- cise (start with regular low-level exercise to avoid initial worsening of pain), and stress reduction. Start all medi- cations at a very low dose and increase slowly. Where high-level surgical skills are available, excision of endo- metriosis lesions, if present, can sometimes improve the pain, although frequently this type of pain continues af- ter surgery. How can I diagnose the cause of dyspareunia? Dyspareunia (painful intercourse) may be the most dis- tressing symptom for many women, as it interferes with the relationship they have with their husband. She may feel that she is letting her husband down when she is unable to have intercourse due to pain, and he may feel that she is avoiding intercourse because she no longer loves him. It is important to identify the cause of the problem: • Examine the vulva visually for abnormalities (in- fection, dermatitis, lichen sclerosis). • Use a cotton-tipped swab to test for tenderness of the posterior fourchette, even if it looks normal (to check for vulvar vestibulitis). • Use one fi nger in the lower vagina to push back- wards (to check for pelvic fl oor muscle pain or vaginismus). Use one fi nger to push anteriorly (to check for bladder or urethral pain). • Use one or two fi ngers to check the upper vagina for nodules of endometriosis, pelvic masses, or uterine fi xation. Push the cervix to one side to check for contralateral adnexal pain (to check for endometriosis, ovarian cysts, pelvic infection, or adhesions). • Use a speculum to look for cervicitis, vaginal in- fection, vaginal anomaly, or endometriotic nod- ules in the posterior vaginal fornix. 232 Susan Evans If any part of the examination causes pain, ask the patient if this is the same pain she has with intercourse. It is important to examine the lower vagina gently with one fi nger before using the speculum, or pelvic fl oor/ bladder pain may be missed. Generalized dyspareunia, especially where sharp pains are present, may be neu- ropathic. Include in the consultation a discussion about the relationship she has with her husband and whether he is supportive of her. How can I help my patient with a painful vulva (vulvodynia)? General vulval care is often helpful. Th e patient should not use soap and should avoid vulval products such as talc or oils. Recommend aqueous cream as a soap, soother, and daily vulval moisturizer. Recommend cot- ton underwear and loose clothing. Treat any vaginal infection. Prescribe amitriptyline 5–25 mg at night or an anticonvulsant for vulval pain if present. For vulvar vestibulitis, prescribe a course of oral ketoconazole (an- tifungal) 200 mg and betamethasone cream (0.5 mg/g) applied thinly daily for 3 weeks. For lichen sclerosis, prescribe steroid cream applied thinly daily for intermit- tent courses only when symptoms are present. How can I help my patient with painful pelvic muscles? Th e muscles are in spasm and do not relax normally. Th is type of pain can be secondary to painful bladder symptoms, any type of pelvic pain, previous sexual as- sault, or anxiety regarding sexual intercourse. Pain is se- vere, just as pain from back spasms can be severe. Typi- cal symptoms include dyspareunia (with pain for 1–2 days afterwards), pain on moving, pain with insertion of a fi nger or a speculum, and pain with tampons. Th ere may be pain on prolonged sitting. Pelvic fl oor muscle spasm is involuntary, and the patient cannot “just relax.” Th e best treatment involves pelvic fl oor physiotherapy, instruction in relaxation techniques, and the regular use of vaginal dilators in a relaxed, secure, nonpainful situ- ation. Intercourse should be avoided until the problem has resolved because the problem will worsen with re- peated painful intercourse. If intercourse continues, a vaginal lubricant and a slow approach to intercourse may help. Other treatments include: • Resolution of initiating factors, e.g., bladder symptoms/pelvic pain. • Avoid straining with voiding or trying to stop passing urine in mid-void. • Regular gentle exercise (e.g., walking, stretching, gentle yoga), improved posture, sitting square in a comfortable chair with good support, keeping both feet fl at on the fl oor when sitting, and taking regular breaks. • Heat packs to the pelvis and a warm bath 1–2 times daily for 3–6 weeks • Management of anxiety and depression, if present. When should I refer my patient with pelvic pain to a surgeon? Surgery should be considered where nonsurgical treat- ments have failed. Laparoscopy is preferred to laparoto- my where it is safe and available. However, laparoscopy requires advanced surgical equipment and skills, and major surgical complications do occur. It is therefore important to try nonsurgical options fi rst. Endometrio- sis surgery is frequently diffi cult and requires the best surgical skills available. Situations that suggest severe disease, possibly requiring a bowel surgeon as well as a gynecologist, include: • Th e presence of ovarian endometriomas. • Nodules of endometriosis palpable in the recto- vaginal septum. • An immobile uterus. • Pain opening the bowels during the menstrual period. In premenopausal women, if postoperative estro- gen replacement is unavailable, bilateral oophorec- tomy should be avoided, if possible. Endometriomas in young women should be managed with cystectomy rather than oophorectomy in most cases. Drainage alone of an endometrioma is usually followed by rap- id recurrence. What are common barriers to eff ective pain management? A long delay between the beginning of symptoms and the diagnosis and management of pelvic pain is com- mon for many reasons. Th e patient’s family may not believe that her pain is real and severe, she may believe that severe pain with periods is normal, or her local doctor may believe that she is too young for endome- triosis or underestimate how severe her pain is. Other barriers to eff ective pain management include fear of gynecological examination, especially where a female doctor is unavailable; fear of surgery, infertility, and cancer; and fear of the unknown. Dysmenorrhea, Pelvic Pain, and Endometriosis 233 It is therefore important to explain to the patient and her family: • Th e pain is real, and the pain is not her fault. • She does not have cancer, and her pain is not life- threatening. • Although it may not be possible to completely cure all her pain, she can optimistically look for- ward to less pain and living better with what pain remains. It is important to be positive. • Resources she can contact if she needs help. • What extra pain relief she can use if the pain be- comes more severe; her anxiety will decrease when she knows that she can manage pain if it occurs. • To ensure that she is not overworked, because tiredness will worsen her pain. • To ensure that she has activities in her life that she enjoys. What should I ask at follow-up visits? Follow-up assessments are important because the pain will vary over time, and the patient will need continued support to be well. At each follow-up: • Ask about each of the pains she reported at her fi rst visit to assess progress. Pain that has been resolved is often forgotten. She may feel that no progress has been made if any pains remain. • Ask about any new pains. Ask about sexual func- tion. Off er treatment for any new pains. • Discuss lifestyle issues again, such as regular ex- ercise, healthy diet, stress management, relation- ship issues, and activities that she enjoys. • Make sure she understands that her pain may change over time but that help is available if she needs it. Pearls of wisdom • Most women with chronic pelvic pain have sever- al diff erent pain symptoms. Each pain needs to be assessed, and a treatment plan made. Pelvic pain cannot be considered as a single entity. • Many common causes of pelvic pain cannot be seen during an operation, including bladder pain, neuropathic pain, uterine pain, pelvic fl oor mus- cle pain, and bowel pain. Some women have en- dometriosis and all these other pains. Migraine headaches are also common. • Women with chronic pain who appear “worn down” emotionally or depressed often have a neuropathic component to their pain. Th is will be worse if the patient is stressed or overworked. • Recognize that many women have had pain for long periods of time, resulting in loss of confi - dence, employment and education opportunities, relationships, and sometimes fertility. • It is important that the patient’s family value her health and happiness, and that she has activities in her life that bring her joy, relaxation, and satis- faction. “Fit, happy people have less pain.” • Recognize that while surgery can be very helpful, it does not cure all pain. Th e decision whether to proceed to surgery or use nonsurgical treatment will depend on the surgical facilities available. • Be careful to explain the pain to the patient and make sure she knows that you believe in her pain. Most women with this type of pain have been told that “it is all in their head,” which lowers their self-esteem. • Make sure that the family knows that the pain is real. Th e patient will need the support of her fam- ily to access care. References [1] Evans S. Endometriosis and pelvic pain. Available from: www.drsusane- vans.com. (An easy-to-read book for patients that explains how to diag- nose and treat many types of pelvic pain.) [2] Howard FM. Pelvic pain: diagnosis and management. Lippincott Wil- liams and Wilkins; 2000. (A textbook for doctors describing all aspects of pelvic pain in detail.) [3] Stein A. Heal pelvic pain. Available from: www.healpelvicpain.com. (A book for patients with all types of musculoskeletal pelvic pain.) Websites www.endometriosis.org (world forum for patients and doctors) www.endometriosisnz.org.nz (for teenagers with endometriosis) www.ic-network.com (for bladder symptom information) 235 Guide to Pain Management in Low-Resource Settings, edited by Andreas Kopf and Nilesh B. Patel. IASP, Seattle, © 2010. All rights reserved. Th is material may be used for educational and training purposes with proper citation of the source. Not for sale or commercial use. No responsibility is assumed by IASP for any injury and/or damage to persons or property as a matter of product liability, negligence, or from any use of any methods, products, instruction, or ideas contained in the material herein. Because of the rapid advances in the medical sciences, the publisher recommends that there should be independent verifi cation of diagnoses and drug dosages. Th e mention of specifi c pharmaceutical products and any medical procedure does not imply endorsement or recommendation by the editors, authors, or IASP in favor of other medical products or procedures that are not covered in the text. Guide to Pain Management in Low-Resource Settings Chapter 31 Pain Management Considerations in Pregnancy and Breastfeeding Michael Paech Case report 1 (analgesics in pregnancy) You are visited by a woman, Shillah, and her partner, Alusine, from a large rural town. Th ey have recently married, and they plan to move to the regional city and stay with relatives because they are hoping to start a family. Alusine says: “Doctor, my wife has bad back and leg pain, and every day she takes medication prescribed by the local doctor. We are trying to have a baby, so I am worried about how those drugs might aff ect the baby. Is it okay for her to keep taking them?” You ask Shillah about her pain, and learn that she has had it for over a year since a motor vehicle ac- cident in which she broke some lumbar vertebrae. Th e pain has persisted and is a burning sensation that radi- ates from the low back down through the buttock past the back of her knee, often occurring at night when she is lying quietly. She also has an area near her spine in the lower back that tingles and feels sore, even when it is only touched lightly. He doctor has tried her on several diff er- ent analgesic drugs, and the only one that helps a little is a tablet she takes at night before bed, although she is also taking an anti-infl ammatory drug, and she takes some codeine when the pain is bad—but it makes her consti- pated, so she doesn’t like to use it much. On examination she has no obvious spinal abnormality. You later learn she is taking a low dose of amitriptyline (10 mg) at night, regular diclofenac (100 mg twice a day), and codeine (30–60 mg every 6 hours as required, but only once or two days each fortnight). Should you be concerned about prescribing pain killers in a pregnant or lactating woman? We should be cautious about prescribing any drug to a pregnant woman! Nevertheless, almost 90% of wom- en take prescribed drugs during pregnancy. Although the incidence of analgesic use during pregnancy varies across diff erent countries, it is probably 5–10% during the fi rst trimester and is likely to be much higher in later pregnancy. Th e incidence of perinatal use of illicit drugs (including opioids) also varies widely, but it ranges from 10% to 50%. Th us, it is extremely common for preg- nant women and their fetuses to be exposed to drugs relevant to pain management during pregnancy and lactation. Th e incidence of fetal abnormalities among live births is approximately 2%, so this background rate should be considered when comparing rates in the whole pregnant population with those among women taking specifi c drugs. Despite the prevalence of their use, there is very little information about the eff ects of analgesic drugs being taken prior to conception on fertility. Th ere are limited human epidemiological or observational data on the eff ects of pain-relieving drugs during early preg- nancy. With the exception of aspirin and the nonsteroi- dal anti-infl ammatory drugs (NSAIDs), the embryo ap- pears protected in the fi rst 2 weeks. Th e fetus is most 236 Author(s) at risk during the period of organogenesis, between 17 and 70 days postconception; however, the use of some drugs during the second and third trimesters of preg- nancy can also cause organ abnormalities, especially in the central nervous and cardiovascular systems. It is thus important to know, in detail, the potential risks as- sociated with analgesic drug administration at any stage of pregnancy. Fortunately, we know it is likely that millions of women have taken some of the commonly used pain killers, both at the time of conception and dur- ing early pregnancy. For a number of analgesic drugs, extensive clinical experience indicates a very low risk of problems, which is reassuring. When clinical in- formation is combined with analysis of animal data about potential teratogenic or carcinogenic eff ects, or data about how much drug is transferred into the breast milk, the level of concern about a drug can be estimated. Consequently, regulatory bodies and edu- cational organizations in many countries have classi- fi ed drugs into risk categories that are used to guide a risk versus benefi t assessment in the pregnant and lactating woman. For example, there is no evidence that opioids are risky in early pregnancy, but they may cause depression of the neonate at birth, so most opi- oids are classifi ed as drugs that have harmful but re- versible pharmacological eff ects on the human fetus or neonate, without causing malformations. It is imperative to relieve maternal suff ering, but at the same time, harm to the fetus should be avoided. Breastfeeding is also a critical imperative for optimizing the infant’s health, possibly with life-long benefi ts. It is important that we know where to look and are able to access information about these topics when specifi c in- formation is required. What would be the ideal approach to pain management in pregnancy and lactation? During and immediately prior to pregnancy, nonphar- macological pain management options should be con- sidered and explored before analgesic drugs are used. Ideally, if available in the regional city, and prior to Shillah becoming pregnant, she should be reviewed by a group of health care providers, particularly those with an interest in pain medicine and clinical experience dealing with patients with diffi cult pain management problems. In Shillah and Alusine’s case, for example, this group might include an orthopedic surgeon, a reha- bilitation physician, an obstetrician, a family doctor, an anesthetist or pain specialist, a physiotherapist, a chi- ropractor, a psychologist, a pharmacist, and/or a com- munity nurse. Th is multidisciplinary team approach will optimize her care, and regular review of her pain management can be organized. Shillah may well have physical and psychological factors contributing to her pain that can be treated in various ways, includ- ing physical therapies and even invasive pain therapy procedures or surgery, such that her reliance on drugs might be reduced or even eliminated. Th e latter would, of course, solve all the issues related to the potential pharmacological toxicities of drugs administered dur- ing pregnancy. Even if drug treatment remains the only way of controlling her pain, her response to the types of drugs, their doses, and the regimens prescribed will need to be reviewed once she becomes pregnant and as pregnancy advances. What would your advice be for Shillah and Alusine? Shillah has chronic nonmalignant pain with neuro- pathic features, and you should refer to the chapters on back pain and neuropathic pain for information. You also need to be in a position to advise her about the specifi c risks of the drugs she is currently taking and about any risks associated with alternative drugs. First, what about a tricyclic antidepressant such as am- itriptyline, an NSAID such as diclofenac, and an opioid such as codeine? It is important to be honest and transpar- ent in all communication. Although there can be no guarantees of complete safety with any drug, and be- cause controlling neuropathic pain can be challenging, it is not necessary for her to abandon all pain killers. Indeed, there is no evidence that continuing amitrip- tyline in early pregnancy signifi cantly increases the risk of malformations. Th is is a drug many pregnant women have used, so the couple can be reassured of its relative safety, and it could be continued. Th e NSAIDs such as diclofenac and indomethacin (and a similar drug, aspirin) are not eff ective against neuropathic pain but may be very helpful for a few days for mus- culoskeletal or postoperative wound pain. However, unless there is active infl ammation, which is unlikely in Shillah’s case, they should not be continued long- term. Although these drugs do not cause fetal mal- formations, they adversely infl uence fertility, increase the risk of miscarriage by interfering with blastocyst implantation, and can cause serious problems in late Chapter Title 237 pregnancy (see below). You should advise Shillah to stop the diclofenac, and if available to try paracetamol (acetaminophen) instead, this being a much safer op- tion. Although it is not ideal, there is no reason why Shillah should not continue to take codeine when she needs it (at a maximum dose of 240 mg per day), es- pecially if you check her diet and advise her as to how to reduce her risk of constipation. Codeine has been used by many pregnant women and is considered safe for the fetus in early pregnancy. Th e main problem with codeine is that some people lack the liver enzyme required to demethylate it to its active metabolite, morphine, rendering it completely ineff ective. Other people are ultrarapid codeine metabolizers and will ex- perience higher plasma concentrations and more side eff ects (sedation, dysphoria, constipation, and neonatal depression), even after small to modest doses. Are there any other analgesics that might be available when Shillah attends the large city hospital? Th ere are some other pain killers that might prove more eff ective or cause fewer side eff ects. Instead of codeine, oxycodone (5–15 mg repeated as required) is an ex- ample of an oral opioid, eff ective against moderate to severe pain, which causes less constipation. Long-term opioid administration continued until delivery of the baby has some signifi cant disadvantages, however (see case 3 below), so it would be essential to confi rm that Shillah’s pain is opioid-sensitive. She could be admitted to hospital, her pain evaluated (pain scores, functional disability, and opioid-related side eff ects) and docu- mented, and then the opioid introduced at a low dose, escalating the dose over a few days until the drug is ef- fective with acceptable side eff ects, or until failure (lack of eff ect, or benefi t limited by excessive side eff ects). Another possibility is tramadol, which has oral and intravenous formulations. Doses of 400–600 mg per day are eff ective against both acute pain and neu- ropathic pain. Tramadol has several antinociceptive ac- tions (serotoninergic, noradrenergic, and weak mu-opi- oid activity from its principal metabolite), is useful for moderate to severe pain, and does not cause respiratory depression. Tramadol should be avoided in women who are at increased risk for seizures, such as those with preeclampsia or eclampsia, or those taking other drugs that increase central nervous system levels of serotonin. Common side eff ects are nausea and dizziness. Animal studies indicate that tramadol is a low-risk drug for fetal abnormalities, but experience in early pregnancy is very limited, so it would be preferable to use an opioid in- stead for Shillah. After the period of organogenesis, lim- ited data suggest that tramadol is probably of low risk to the fetus, although high dosing near delivery should be avoided (see case 3 below). In some countries, transdermal clonidine patch- es (100 μg/day) are available, but clonidine is of ques- tionable eff ectiveness, and despite extensive clinical use during pregnancy without evidence of causing congeni- tal abnormalities, data on its safety in the fi rst trimester are very limited. Th erefore, the use of clonidine is not recommended. 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