Medical Management of Acute Pain
Opioids can be effective in the treatment of acute pain, especially when combined with other analgesics. However, they are not always necessary and at times pose more risks than benefits to the patient.
By definition, acute pain is self-limited discomfort that typically lasts from a few moments to several weeks but less than 3 to 6 months.1 It can relate to soft tissue or skeletal damage, and may be categorized as spontaneous or post-traumatic, with the trauma planned (surgical) or unplanned (accidental). As the injured tissues heal, acute pain gradually resolves. In the meantime, the pain can vary in severity from mild to severe. Some therapies, such as opioids, are reserved for more severe pain. However, even if pain is severe, it is important to recognize that not all acute pain requires opioid therapy. In fact, over the past 10 to 15 years, there has been overutilization and prolonged use of opioids for acute pain. This increased opioid prescribing and availability has led to increased abuse and misuse. Studies suggest that patients discharged on opioids are more likely to remain on opioids 1 year later compared with patients who were not discharged on opioids.2,3
Types of Acute Pain
Acute pain can vary significantly and may be categorized into two main types: spontaneous insult or trauma and elective or planned procedures.
Spontaneous Insult or Trauma
Mildly painful spontaneous conditions include headache, upper respiratory infection, or a sore back from doing yard work, and may be self-treated with rest-ice-compression-elevation (RICE) therapy and over-the-counter analgesics. Moderately painful conditions include a sprained ankle, strained ligament, deep laceration, or simple bone fracture. These may require interventions such as minor outpatient surgery or splinting, but are generally managed with nonsteroidal anti-inflammatory drugs (NSAIDs), acetaminophen, and RICE.4 Severely painful conditions include trauma such as a motor vehicle accident, traumatic amputation, or burn, and will likely involve surgery and a protracted hospital stay. A stronger combination of analgesics, including opioids, may be required. Of course, the pain level for each case must be individually determined.
Elective or Planned Procedures
Office procedures, including immunizations, phlebotomy, or catheter placement, tend to result in mild acute pain that is usually eased with application of topical lidocaine/prilocaine (EMLA), lidocaine, ice, or devices like a Buzzy, which combines the application of ice and vibration. Moderately painful procedures include same-day dental, arthroscopic, laparoscopic, or podiatric surgeries. This type of pain may be managed with simple analgesics, such as NSAIDs and acetaminophen. At most, a total of 6 to 8 doses of an opioid and acetaminophen combination might be needed if the patient’s discomfort is not controlled with simple analgesics. Severely painful procedures include surgeries requiring inpatient stays, such as orthopedic joint replacement, spine surgery, or colorectal surgery. These will require a combination of analgesics and stronger opioids, possibly starting preoperatively (Table 1).
Multimodal treatment is crucial for optimizing pain relief. Because different modalities may be additive or synergistic, this approach can also reduce the potential for side effects. The cornerstones of multimodal treatment include nerve blocks or epidurals, opioids or other analgesics, adjunctive medications, physical modalities (RICE), and rehabilitation. Psychosocial interventions, including distraction, meditation, and deep breathing, are also central components. Providers and patients are often too focused on the pharmacologic options, which are only a small part of the solution.
Simple analgesics, including NSAIDs and acetaminophen, are most effective for treating acute pain because they target the natural inflammation that occurs with an injury. NSAIDs can be more effective than opioids and/or muscle relaxants for treating acute low back pain.5 They are also very effective in reducing swelling and pain caused by a muscle strain or sprain. In a study of patients who underwent ambulatory orthopedic surgery, NSAIDs appeared more effective as patients required less rescue analgesics and had fewer adverse effects than patients taking either placebo or hydrocodone/acetaminophen.6 They can be given as “pre-emptive” analgesics for surgery as well as postoperatively in the elective setting.
Of course, simple analgesics are not without risk. Acetaminophen should be avoided in patients who drink alcohol or who have liver disease. Patients with coronary artery disease, stroke, renal disease, significant peptic ulcer or gastroesophageal reflux disease (GERD), or bleeding disorders should not take NSAIDs. There are a few exceptions. COX-2 selective agents, such as celecoxib (Celebrex), are used in the surgical arena because they do not affect platelet function or directly increase the risk of bleeding (all other contraindications apply).
Menthol, camphor, methyl salicylate, or a combination of these counterirritants can be useful in managing localized musculoskeletal injuries, particularly when they can be massaged into the painful area. As long as the skin is intact, these can offer short-term relief of muscle pain. Many products are inexpensive and available over the counter. However, they must be applied several times per day, and some products have a strong, offensive odor.
Lidocaine or lidocaine/prilocaine may offer some localized, superficial anesthesia prior to IV catheter placement or phlebotomy. These typically require a prescription and must be applied at least 15 to 30 minutes prior to the procedure. Topical NSAIDs, including diclofenac patches or gel, also can provide good pain relief and are generally underutilized, particularly in the elderly.7 These, too, require a prescription.8
Historically, in response to concerns about inadequately treated pain, both patients and providers began looking to opioids to relieve pain and suffering. Unfortunately, as a result of the increase in prescribing and availability, misuse and abuse resulted. Sometimes opioids are used long past the resolution of an acutely painful condition.
Treating Acute Pain With Opioids
A few key points to consider when determining the most appropriate treatment for a patient with acute pain: