Ann Hematol Oncol. 2017; 4(7): 1161. Show
*Corresponding author: Hassan Al-Jafar, Department of Hematologist, Amiri Hospital, Kuwait AbstractSickle cell disease is a congenital blood disorder affecting hemoglobin molecule. It leads to a rigid, sickle like shape red blood cell. Most people with sickle cell disease have severe painful episodes called vaso-occlusive crises. However, the frequency, severity, and duration of these crises vary tremendously. The pain is classified into two types, nociception pain which is intact peripheral or central nervous system and neuropathic pain which is initiated by dysfunction of the peripheral or central nervous system. Despite the pain being the most common complication of sickle cell disease, there is a lack of novel pain treatments. Pain killers including opioid have continued to be the main stay of therapy over the past several decades. A non-conventional treatments for pain were applied effectively to avoid the serious systemic side effects of the pharmaceutical pain killers. IntroductionSickle cell disease (SCD) affects hemoglobin, the molecule in red blood cells that delivers oxygen to cells. This disorder has atypical hemoglobin molecule called hemoglobin S, which leads to a rigid, sickle-like shape red blood cell under certain circumstances. Problems in SCD typically begin around 5 to 6 months of age. Long term pain develops as people get older [1]. SCD may lead to various acute and chronic complications, several of which have a high mortality rate [2]. Most people with SCD have intensely painful episodes called vaso-occlusive crises. However, the frequency, severity, and duration of these crises vary tremendously. Painful crises complications are treated symptomatically with pain killer medications at regular intervals until the crisis settle down. The vaso-occlusive crisis is caused by sickle-shaped red blood cells that obstruct capillaries and restrict blood flow to an organs resulting in ischemia, pain, and often organ damage. The frequency, severity, and duration of these crises vary considerably [3]. Pain is the hallmark of SCD and the acute sickle cell painful episode is the most common cause of more than 90% of hospital admissions among adult patients who have SCD [4]. Effective management of sickle cell pain is variable and complicated [5]. Major prerequisites for an effective and rational management of sickle cell pain depend on the patient, the pathophysiology of the disease, the pharmacology of analgesics, and the attitude of the health care provider. Sickle cell pain is also strongly affected by psychological, social, cultural, and spiritual factors. It is, however, consequent to tissue damage generated by the sickling process and occlusion of the micro-vasculature [6]. Current research in characterizing pain in SCD patients indicates that both acute and chronic pain are prevalent among the adult patients, while infants and children mostly suffer from acute pain [7,8]. The shift from acute to chronic pain may therefore occur during the transition from childhood to adolescence. Young children with a median age of 3.8 years (range 0.3-7.6 years) exhibited less frequent pain. In another, study 100 young subjects, about 40% of children and adolescents in the age range of 8-18 years reported chronic pain with another 40% exhibiting episodic pain, and the remainder had no pain. Though the pain intensity and quality of life were comparable among the young patients with chronic and episodic pain, the patients with chronic pain suffered from greater functional disability, depression and hospital admissions compared to the episodic pain group [9]. The adult patients recruited in the Pain in Sickle Cell Epidemiology Study (Pisces) reported chronic SCD pain on 54.5% [8]. Opioids have remained the major strategy to treat acute sickle pain, while chronic pain is managed with the combination of Non-Steroidal Anti-Inflammatory Drugs (NSAIDs), opioids, anti-depressants, and anticonvulsant medications [10]. However, to date no satisfactory therapy exists [11]. Types of painNociception Pain is the more common type of pain in SCD. It is the process by which intense thermal, mechanical or chemical stimuli are detected by a sub population of peripheral nerve fibers, called nociceptors [12]. Nociception pain could happen due to vision, hearing, tasting, and feelings without nerve damage. The signals, when these nociceptors are activated, must be transduced and transmitted to the spine and brain where signals are modified before they ultimately understood [13]. Interaction of inflammatory mediators or nociceptive pain in SCD involves four major pathophysiological processes: transduction, transmission, modulation, and perception [14]. Pain transduction refers to the processes by which tissuedamaging stimuli activate nerve endings. Pain transmission refers to the message carried from the site of tissue injury to the brain. Pain modulation occurs when neurons in the thalamus and brain stem send signals down to the dorsal horn of the spinal cord. Pain perception is the sum of complex activities in the Central Nervous System (CNS) that may shape the character and intensity of pain [15]. Nociceptive somatic pain is the most common type of pain in patients with cancer and bone metastases. The widespread use of bisphosphonates has resulted in improved analgesia and a significant reduction of skeletal complications in patients with malignant bone pain [16]. Nociceptive visceral pain is mediated by discrete nociceptors in the cardiovascular, respiratory, gastrointestinal, and genitourinary systems. It is usually described as deep, squeezing, or colicky and is commonly referred to cutaneous sites, which may be tender. Recent experimental data in animals suggests that kappa-opioid receptor agonists are uniquely efficacious in the treatment of nociception visceral pain [17,18]. Neuropathic pain is defined as pain initiated by damage or dysfunction of the peripheral or Central Nervous System [19]. This is in contrary to inflammatory or nociceptive pain where tissue damage not nerve damage causes the pain [20]. Pain is a frequent complaint of people living with SCD. Nationwide epidemiological survey data indicate that over half of sickle cell patients, they have 1-2 episodes annually. One percent of patients have more than 10 episodes [21]. Hospital admissions for acute painful episodes have been reported to be a predictor of prognosis. Moreover, half of those hospital admissions are readmitted within 1 month after discharge [22]. A more recent study followed diary recordings of SCD patients for up to 6 months and found that 55% of patients with SCD reported pain on more than half of the diary days [23]. Risk for mortality in adults with SCD increases for patients with increased rates of painful episodes [20]. Amanda, et al. found that almost 40% of SCD study population had evidence of neuropathic pain [19]. Although the underlying pathobiology of SCD pain is not well known [24,25]. Neuropathic pain is shown to be associated with higher pain intensity and longer duration, it is harder to treat, and is more refractory to conventional analgesics [26]. Wilke, et al. found only 14% of their SCD study population reported taking an adjuvant drug that could treat neuropathic pain [27]. The infrequent use of neuropathic pain drugs could be because patients are not systematically screened for the presence of neuropathic pain. Appropriate screening using validated tools can identify patients with SCD that may benefit from existing neuropathic pain therapies [28]. Non-conventional management approachesPsychotherapy treatment: Refers to therapeutic interaction or treatment between a trained professional and patient [27]. These primarily relieve symptoms by exploring the patient’s underlying psychological conflicts and emotional disturbances. The psychotherapy focused on mechanisms for coping with stress and resolving emotional problems [29]. In SCD, the impact of genetic and environmental effects can be estimated in the psychological disorders such as the major depression or the individual symptoms like sadness or insomnia. Thus, a number of pain treatments focusing on psychosocial management of episodic painful vaso-occlusive crises and on emphasizing the proper manipulation of the environmental conditions, behaviors, or cognitions to effect change in response to pain. Change is believed to arise from psycho, social, supportive and validating therapeutic environment, in the traditional psychoanalytic approaches or in conflict model of psychopathology and behavioral disorder [30]. Relaxing exercise: Therapy is recommended as an effective treatment for relieving pain with lower back pain by most clinical guidelines [31]. The relaxation response is perhaps one of the most important skills used to gain control over the body. In addition, research on the relaxation response has shown that relaxation can: increase energy, decrease fatigue. It can increase motivation, productivity, and improve decision-making ability. The relaxation response lowers stress hormone levels and lowers blood pressure. It defined as the personal ability to make body release chemicals and brain signals that make muscles and organs slow down and increases blood flow to the brain. There are many ways of achieving the relaxation response. Some of these techniques are called Progressive Muscle Relaxation, Visual Imagery, Deep Breathing, Meditation, Hypnosis, Yoga, and Biofeedback. To date, there is no data supporting the idea that one method is better than any other. What does matter is the willingness to use a particular technique for own health and the ability to gain relaxation through that method [32]. Transcutaneous electrical nerve stimulation (TENS): Has been clinically used for over three decades; the mechanisms by which analgesia is produced are only recently being described [33]. Gate control theory is the most common theory used to support the effect of inhibiting pain by TENS. Pain is reduced when the area is rubbed or stimulated due to activation of non-nociceptive fibers inhibiting the nociceptive response in the dorsal horn of the spinal cord. In TENS, non-nociceptive fibers are selectively stimulated with electrodes in order to produce this effect and thereby inhibit pain [34]. One randomized double-blinded study showed that TENS intervention in female patients with salpingitis, ovarian cyst, dysmenorrhea, reduced pain, anxiety, heart rate, nausea, and arteriolar vasoconstriction with an improvement of overall patient satisfaction [35]. The effect of TENS producing pain relief was further supported in another study in which patients suffering from acute posttraumatic hip pain felt less pain and anxiety with TENS intervention [36]. These observations suggest that TENS could be an effective and fast-acting pain treatment with applications within paramedic practice [37]. TENS has been used in a variety of acute and chronic painful conditions, but has not been studied in SCD pain crises yet which could be a research for the non-nociceptive fibers [38]. Placebo treatment: Placebo treatment is a simulated or otherwise medically ineffectual treatment for a disease or other medical condition intended to deceive the recipient. A person given such an ineffectual treatment will often have a perceived or actual improvement in their condition, a phenomenon commonly called the placebo effect or placebo response [39]. Several different elements contribute to the effect, and the methods of placebo administration may be as important as the administration the drug itself [40]. Common placebos include inert tablets like sugar pills, vehicle infusions [41] and other procedures based on false information [42]. It has also been shown that use of therapies about which patients are unaware is less effective than using ones that patients are informed about. Placebo effects are the subject of scientific research aiming to understand underlying mechanisms [43]. Brain imaging techniques done by Emeran Mayer, Johanna Jarco and Matt Lieberman showed that placebo can have real, measurable effects on physiological changes in the brain [44]. Placebos can produce some objective physiological changes, such as changes in heart rate, blood pressure, and chemical activity in the brain, in cases involving pain, depression, anxiety, fatigue [45]. Ernst and Resch also attempted to distinguish between the “true” and “perceived” placebo effect, as they argued that some of the effects attributed to the placebo effect could be due to other unknown factors [46]. Vibration therapy: Vibration therapy is a mechanical stimulus characterized by an oscillatory motion. The biomechanical variables that determine its intensity are the frequency and amplitude. The extent of the oscillatory motion determines the amplitude (peak to peak displacement, in mm) of the vibration. The repetition rate of the cycles of oscillation determines the frequency of the vibration (measured in Hz) [47]. Recent work has suggested that low amplitude, low frequency mechanical stimulation of the human body is safe and effective way to exercise and relieve musculoskeletal pain [48]. Vibration therapy works in two ways. First, the gentle vibrations help stimulate muscles and ligaments to increase blood circulation. Second, the vibrations serve as a sensory distraction, disrupting pain signals that are constantly traveling from the body to the brain and replacing them with gentle, massaging sensations [49] Best of all, with vibration therapy, there is no feeling of electric shock commonly associated with TENS units [50]. Vibration therapy and circulation treatment is an effective, although it is simple methods of physiotherapy [51]. Massage therapy: Involves working and acting on the body with pressure tension, motion, or vibration, done manually or with mechanical aid [52]. Massage offers physical benefits, such as increased blood and parasympathetic circulation, and improved joint movement, along with psychological benefits, such as relaxation, daily activity promotion, and pain relief [53]. Massage may produce pain relief by pressure stimuli from massage competing with pain stimuli to reach the brain first, thereby, closing the gate to pain, or by restoring sleep and inhibiting the release of Substance P, which is associated with pain [54]. A reduction in muscle rigidity and spasm also may be critical in SCD due to the role of spasms in SCD pain .Tiffany Field and her colleagues at the Touch Institute have extensively examined the positive effects of massage therapy on emotional adjustment (e.g., depression, anxiety), pain responses, activities of daily living (e.g., school attendance, sleeping habits), and stress hormones levels (e.g., cortisol, epinephrine) [55]. Lemanek, et al. studied a randomized controlled trial investigated the short-term effects of massage therapy on youth with SCD and their parents. Youth in this group showed higher levels of functional status, and lower levels of depression, anxiety, and pain [56]. Acupuncture therapy: It has been practiced for thousands of years in China [57]. Most recently, a meta-analysis found acupuncture to be an effective treatment for chronic pain. Acupuncture may mediate various pathways in the CNS between afferent impulses from pain regions and impulses from acupoints to alleviate pain. Existing evidence also suggests that diverse signal molecules contribute to mediating acupuncture analgesia [58], such as opioid peptides, 5-hydroxytryptamine, and cholecystokinin octapeptide and increase endogenous pain modulating substances, such as beta-endorphins, magnesium, and CSF met-enkephalin [59,60]. To date, there are limited studies on the usefulness of acupuncture for SCD. Patients who are facing significant distress due to their pain and are not being provided adequate relief with pharmacologic therapy alone, acupuncture could potentially serve as adjuvant therapy for pain management [61]. Aquatic rehabilitation: Aquatic rehabilitation program found statistically significant reduction in pain [62-64]. It is beneficial in the management of patients with musculoskeletal problems, neuropathic and pain problems. In addition, the margin of therapeutic safety is wider than that of almost any other treatment milieu [65]. Warm water facilitates muscle relaxation and increases peripheral circulation and stimulates body awareness, balance, and trunk stability; the reduction of gravitational forces results in decreased pain sensitivity. Improvement of patient morale and confidence can be established by providing a positive media to function. Aquatic Rehabilitation may be prescribed specifically for cases with chronic and longstanding pain as in SCD [66]. The aquatic rehabilitation program is used for patients with sickle cell anemia. The treatment included warm water exercises, stretching, aerobic exercise, and relaxation. The patient experienced a significant decrease in pain, significant increase in the strength of respiratory muscles, and improved quality of life. It is conclude that aquatic rehabilitation can be used to improve the clinical condition of SCD patients [67]. Hydroxyurea therapy: The only drug currently approved by the US Food and Drug Administration (FDA) for the treatment of SCD. Long-term HU is currently the accepted treatment for frequent and severe pain. HU is a potentially leukemogenic and carcinogenic agent [68]. These increases total and fetal hemoglobin in SCD. The increase in fetal hemoglobin retards gelation and sickling of RBCs. HU also reduces levels of circulating leukocytes, which decreases the adherence of neutrophils to the vascular endothelium. In turn, these effects reduce the incidence of pain episodes [69] and other complications [70]. Studies reviewed herein provide increasing support of efficacy, effectiveness, and safety in both children and adults. In a meta-analysis of the literature through 2007, Strouse, et al. studied found that in children fetal the hemoglobin levels increased from 5-10% to 15-20%; hemoglobin concentration increased modestly (approximately 1 g/L) but significantly; hospitalizations decreased by 56-87%; and the frequency of pain crisis decreased [71]. Children studied by a cooperative group remained on hydroxyurea for more than a year with only minor adverse effects, but potential complications [72]. Vitamin D: Pain in SCD is the earliest, clinical manifestation and the major cause by vaso-occlusion crises [73]. Vitamin D deficiency (VDD) is quite common in SCD. VDD can cause chronic pain, compression fractures, and muscle weakness [74]. Thus, VDD condition are associated with an increased risk of low bone mineral density (BMD). Bone integrity in SCD affected by VDD and bone vasculature abnormalities which could lead to osteopenia, osteoporosis and osteonecrosis [75]. VDD affects 33%- 78% of children and 60-100% of adults with SCD [76]. Research has shown that vitamin D exerts anatomic, hormonal, neurological, and immunological influences on pain manifestation, thereby potentially playing a big role in the etiology and maintenance of chronic pain states and associated comorbidities [77]. It appears there is a substantial overlap between the symptoms of chronic pain seen in SCD and VDD. In both conditions, pain is commonly localized to the lower spine, pelvis and extremity bones and described as a dull, aching pain exacerbated by activity and weight bearing [78]. The combination of vitamin D and calcium supplement are the major agents in treating low BMD due to osteonecrosis in general population even including SCD patient as there is no restrictions in using such agents in SCD patients [79,80]. Herbs therapy: Niprisan has passed phases IIA and IIB, and is widely used in Nigeria, and is known and popular in India and the USA. The US FDA has determined there is sufficient safety and efficacy data for NIPRISAN to start Phase III clinical trial. The US FDA Botanical Review Team (BRT) suggested a simpler formulation of NIPRISAN, development of a chemical fingerprint for the formulation using LC/ MS and elucidation of some of the anti-sickling compounds would improve standardization and increase the probability of obtaining FDA marketing approval [81]. This method may include the use of herbs that can prevent crisis and relieve chronic pain. It is proved that use of prickly ash bark and ginkgo bilboa reduces the risk of crisis up to 75% [82,83]. Traditional Herbal Approaches to SCD in Nigeria are grains of paradise Sorghum bicolor, Pterocarpus osun are used in various health conditions, including SCD [84,85]. Hypnosis therapy: The effects of these techniques on pain control, quality of life, and health care utilization were inconsistent, perhaps because of inadequate study designs (e.g., a lack of suitable control groups and non-standardized scripts) [86]. Evidence exists supporting the efficacy of hypnotic analgesia in a variety of experimental [87], and clinical settings, including pain associated with medical or surgical procedures [88]. Gil and colleagues demonstrated a direct correlation between daily use of pain-coping skills and less major health care contacts. Thus, cognitive measures that influence attitudes and improve pain-coping skills appear to have a significant impact on sleep, functional outcomes such as work and school attendance, use of analgesics, and major health care utilization. Since hypnosis is a cognitive-behavioral strategy that has been shown to have a powerful effect on pain management in a number of settings [89]. A study by Rainville and colleagues (2002) using Positron Emission Tomography (PET) provides supportive evidence that distinct brain changes occur during hypnosis particularly in the anterior cingulate cortex, the thalamus, and the pontomesencephalic brainstem during the production of hypnotic states [90]. Blood exchange transfusion: Red cell exchange transfusions remain an effective but possibly underutilized therapy in the acute and chronic treatment of SCD. In a red cell exchange, the patient’s red cells are removed and replaced by exogenous normal red cells. The exchange transfusion removes the sickle cells from participating in new vaso-occlusive events, pain, reduces hemolytic complications, and provides added oxygen carrying capacity while decreasing the blood viscosity. Red cell exchange may also be useful when there is a need for chronic maintenance of low Hb levels. There are multiple indications for keeping HbS low, the best documented of which are primary and secondary stroke prevention and reduction of severe pain [83,91]. Other indications with less supporting data include elements of the triad of pulmonary hypertension, priapism and leg ulcers associated with red cell hemolysis [92]. Future trendAnti-adhesive agents: Anti-adhesive agents-i.e., agents that impair adhesion in sickle cell disease. These include several classes of drugs/ agents such as anti-selectin, blockers of cell-cell, cell-protein and or protein-protein adhesion. Some of the anti-selectin agents are SelG1-a humanised monoclonal antibody antibodydirected against P-selectin called SelG1. A phase I clinical study showed that SelG1 was safe and well tolerated in healthy males and females. There were no infection-related adverse events, alterations in coagulation test results, bleeding, or formation of specific antibodies against SelG1. Pharmacodynamic analysis showed that a single 5 mg/kg dose of SelG1 was sufficient to block P-selectin activity for at least 28 days. The current phase II trial is testing the use of SelG1 as preventive therapy for vaso-occlusive complications of SCD, specifically acute painful episodes. SelG1 is being tested as monthly infusions at two dose levels (5 mg/kg and 2.5 mg/kg). Potential adverse effects of P-selectin inhibition include bleeding, the possibility of infection because P-selectin is a mediator of neutrophil adhesion to the vascular endothelium [93]. Anti-platelet agents: Treatment of either acute or chronic clinical manifestation of SCD is still limited due to the small and relative lowquality design of the studies [94] and few reports on the use of such agents in SCD. However, most of these studies did not correlate with in vivo effect of the drugs on platelet activation with specific clinical endpoints [91]. Recent reports suggest that antiplatelet agents, particularly when administered at doses sufficient to inhibit platelet activation may be beneficial in preventing or treating vaso-occlusive complications in patients with SCD [95,91]. Anti-coagulant treatment: Treatment with heparin, has been considered as an additional therapeutic approach to block sickle cell adhesion to endothelial cells through the P-selectin pathway [96], or binding to TSP that can mediate the interactions between sickle erythrocytes and the vascular endothelial surface. A doubleblind randomized trial with tinzaparin in SCD patients during acute vaso-occlusive events documented a reduction of their severity and duration [97]. Studies with low dose of warfarin or acenocoumarol were reported to slightly reduce the frequency of acute pain events with decreased thrombin generation and fibrinolysis, however without reaching a significant clinical amelioration [98]. Calpain 1 therapy: In the Berkeley sickle mice, mast cell activation contributes to neurogenic inflammation, chronic pain, and Hypoxia/Reoxygenation (H/R)-evoked hyperalgesia, which were ameliorated upon treatment with mast cell inhibitor imatinib, and cannabinoids as well as nociception receptor ligand AT200 [99,100]. Systemic deletion of calpain-1 in Townes sickle mice ameliorated chronic pain behaviors including mechanical, heat, cold, and deep tissue/musculoskeletal hyperalgesia. The ultimate goal of any sickle cell therapy is the reduction of chronic pain and episodes of acute pain crises in patients with SCD [101]. In rat models of spinal nerve injury, inhibition of calpain-1 reduced neuropathic pain [102]. Thus, evaluated whether experimental sickle mice SSCKO would show a reduction in pain behaviors that have been previously characterized in the Berkeley and Townes sickle mice [99]. The chronic thermal and deep tissue hyperalgesia are completely ameliorated by the deletion of calpain-1 gene in SS mice. Thus, calpain-1 may contribute to the regulation of chronic hyperalgesia in SCD [101]. Gene therapy treatment: Has long been proposed as a potential cure for SCD [103]. The permanent delivery of a corrective or antisickling gene cassette into long-term, repopulating hematopoietic stem cell could allow for the production of corrected RBCs for the long life of the patient. In order for gene therapy for SCD to become a reality, 2 main objectives must be achieved: (1) safe and efficient gene transfer or correction of long-term repopulating hematopoietic stem cell and (2) high-level, appropriately regulated, stable gene expression. With current progress at the laboratories and in the clinical work, these goals now appear within reach. The long path to the clinic for SCD gene therapies has been paved by landmark discoveries that have provided important insights into the developmental regulation of the β-globin gene cluster [104]. ConclusionPain in SCD is multifactorial, nociceptive and neuropathic. The nociceptive pain which seems the more common type of pain in SCD, could happen due to vision, hearing, tasting, and feelings without nerve damage. Although there is no guideline to treat the sickle cell anemia, the non convenential methods in pain relief as the reassurance, hand massage; vibration massage, transcutaneous electrical nerve stimulation, psychological treatment and social care should be all applied to avoid using the opioids which could drive the sickle cell patients to be opiods dependent. AcknowledgmentOur thankful to the sickle cell Kuwaiti group in its co-operative work in this review. References
How do you manage sickle cell anemia pain?Diclofenac and ibuprofen are commonly used NSAIDs in sickle cell anemia patients. If the pain persists, an opioid can be added. Moderate-to-severe pain usually is treated with opioids. For moderate pain, a weaker opioid such as codeine may be sufficient.
What is commonly prescribed for pain relief during a sickle cell crisis?Based on the pain pathophysiology, physicians frequently choose non-steroidal anti-inflammatory drugs (NSAIDs), paracetamol and opiates to treat sickle cell painful crisis. These are the three main classes of analgesics that prove to be most effective in painful crisis.
Should sickle cell patients be treated with ice?Vaso-occlusive episodes are blockages of the blood vessels by deformed red blood cells. Infection, fatigue and dehydration are possible triggers for a pain crisis. Do not use ice packs to treat pain.
Is ice or heat better for sickle cell anemia?Apply warm compresses where it hurts (never use ice or cold packs). Drink lots of water and other non-caffeinated beverages. Take over-the-counter pain medicines, like ibuprofen or acetaminophen.
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