The COPD patient who couldn’t stop worrying

Evaluation of anxiety and depression in a patient with COPD is complicated by a high degree of symptom overlap. Patients with COPD may experience anxiety symptoms such as shortness of breath, rapid heart rate, numbness/tingling, and racing thoughts, and/or depressive symptoms such as decreased energy, impaired sleep, and impaired concentration. It can therefore be difficult to discern if a symptom is attributable to the physical diagnosis, the psychiatric diagnosis, or a combination of both. Catastrophic thinking about mild physical symptoms is common in patients with COPD. This can lead to hyperventilation and hypocapnia (manifested by lightheadedness, dizziness, paresthesia, and altered consciousness), with a reciprocally escalating cascade of anxiety and somatic symptoms.¹

First-line therapy for anxiety disorders with comorbid COPD is CBT and other nonpharmacologic interventions.^2,3However, access to CBT-trained psychotherapists is limited due to the cost and a shortage of qualified professionals.⁴ One randomized clinical trial evaluated improving accessibility to this therapy by training respiratory therapists to perform CBT sessions for COPD patients who were anxious and depressed.⁴ This method was as successful as using CBT-trained psychotherapists, and also reduced emergency room visits and hospitalizations in this population.⁴ Respiratory therapists often intuitively use CBT concepts in coaching patients and generally have the knowledge and background to be able to help patients identify symptoms caused by anxiety vs when to seek additional medical support. Furthermore, these interventions have been shown to increase quality-adjusted life years,⁴ improve physical performance, and reduce symptoms of anxiety and depression as reported on the Beck Anxiety Inventory and Beck Depression Inventory.⁵ In addition to relaxation/imagery training, cognitive restructuring, breathing retraining, and maintaining daily symptom logs, CBT for COPD may include interoceptive exposure therapy. This technique involves deliberately inducing hyperventilation, followed by desensitization exercises to uncouple any uncomfortable physical sensations with the conditioned fear response.¹

Although there is little evidence that traditional pharmacologic treatments (eg, antidepressants, benzodiazepines) have a statistically significant effect on anxiety and depression in COPD, studies have found that they have some clinical benefit.³ Risks, however, limit the utility of certain agents. Sedative-hypnotics potentially decrease respiratory drive and, particularly in older patients, antidepressants’ sedating effects can increase the risk of falls³ leading to increased morbidity, hospitalization, and mortality.

TREATMENT Mindfulness techniques and meditation

Ms. M’s symptoms show no improvement with the addition of lorazepam, 0.5 mg twice daily. A clinician teaches Ms. M mindfulness techniques, and she begins a trial of daily, individual, guided meditation using a meditation app. Respiratory therapists also instruct her on controlled breathing techniques such as pursed-lips breathing, diaphragmatic breathing, and deep breathing. They also encourage Ms. M to participate in the daily exercise group while on the unit.

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The authors’ observations

Research indicates that low doses of opioids are safe and effective for refractory breathlessness in patients with severe COPD(those with an arterial partial pressure of oxygen ≤55 mm Hg or arterial oxygen saturation ≤88%).^6,7 Patients at this advanced stage of illness have likely been started on oxygen therapy to improve survival but may need additional palliative measures to alleviate the discomfort associated with the severe breathlessness experienced at this stage.⁸ In such situations, low-dose opioids, such as immediate-release morphine, 1 mg/d given as 0.5 mg twice daily, can be started.⁸ The dose can be increased by 0.5 mg until a therapeutic dose is achieved.⁸ Alternately, 24-hour extended-release morphine, 20 mg/d, or an equivalent dose of oxycodone or hydromorphone, can be prescribed.⁸ The proposed therapeutic mechanisms of low-dose opioids for these patients include decreasing one’s sense of effort, altering central perception, altering activity of peripheral opioid receptors located in the lung, and decreasing anxiety.⁸

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