ObjectiveAcute intermittent porphyria is a rare metabolic disorder that affects heme synthesis. Patients with acute intermittent porphyria may experience acute debilitating neurovisceral attacks that require frequent hospitalizations and negatively impact quality of life. Although clinical aspects of acute intermittent porphyria attacks have been documented, the experience of patients is not well known, particularly for those more severely affected patients who experience frequent attacks. The aim of the present study was to qualitatively characterize the experience of patients with acute intermittent porphyria who have frequent attacks, as well as the impact of the disease on daily living.MethodsPatients with acute intermittent porphyria who experience frequent attacks were recruited and took part in 2-h qualitative one-on-one interviews with a semi-structured guide. Interviews were anonymized, transcribed, and coded. The inductive coding approach targeted textual data related to acute intermittent porphyria attack symptoms, chronic symptoms, and the impact of the disease. Saturation analysis was conducted to assess whether the research elicited an adequate account of patients’ experiences.ResultsIn total, 19 patients with acute intermittent porphyria were interviewed (mean age 40 years; 79% female). Eighteen patients (95%) experienced both attack and chronic symptoms. Patients described attacks as the onset of unmanageable symptoms that generally lasted 3–5 days requiring hospitalization and/or treatment. Pain, nausea, and vomiting were considered key attack symptoms; pain, nausea, fatigue, and aspects of neuropathy (e.g., tingling and numbness) were considered key chronic symptoms.ConclusionsIn this study population of acute intermittent porphyria with frequent attacks, most patients had symptoms during and between attacks. In these patients, acute intermittent porphyria appears to have acute exacerbations as well as chronic day-to-day manifestations, and is not just intermittent as its name implies. As a result, patients reported limitations in their ability to function across multiple domains of their lives on a regular basis and not just during acute attacks.Electronic supplementary materialThe online version of this article (10.1007/s40271-018-0319-3) contains supplementary material, which is available to authorized users.

Introduction Acute hepatic porphyria (AHP) is a family of rare metabolic diseases characterized by potentially life-threatening acute attacks and, in some patients, chronic debilitating symptoms. While patients with frequent or recurrent attacks (three or more attacks annually) are known to have reduced health-related quality of life (HRQoL) as most aspects of daily living are impacted, limited data exist in patients with sporadic attacks. This research aims to identify porphyria-related symptoms between attacks, characterize the frequency, severity, and bothersomeness of these symptoms, and more generally understand the burden of this disease in patients who experience attacks sporadically. Methods Patients with AHP with sporadic attacks (AHP-SA) (at least one porphyria attack in the past 2 years, but no more than two attacks per year in the previous 2 years) were recruited, via outreach performed by patient advocacy groups, for participation in qualitative telephone interviews. Interviews were conducted using a semi-structured guide and were audio-recorded, transcribed, anonymized, coded, and analyzed to determine if saturation was reached. Results A total of 14 participants with AHP-SA were interviewed (mean age 45 years, 100% female). The most frequently reported chronic symptoms were fatigue, pain, heartburn, and constipation. The most frequently experienced chronic impacts were difficulty performing daily activities, difficulty exercising, negative impact on work, need for a special diet, anxiety, and depression. Beyond these chronic symptoms and impacts, participants also frequently described flares in their porphyria that were severe, did not qualify in their minds as an acute attack, but were nonetheless more severe than their typical chronic experience. Conclusion Patients with acute hepatic porphyria who experience sporadic attacks face significant chronic symptoms and impacts that frequently require significant pharmacological and clinical treatment. The reported severity of these symptoms and impacts suggests that the humanistic burden of AHP-SA is substantial and may lead to a significant decrease in health-related quality of life in these patients between acute attacks. The presence of flares that do not reach the level of what is considered an acute attack by patients is a unique finding of this study not reported elsewhere and requires additional investigation. Supplementary Information The online version contains supplementary material available at 10.1007/s12325-022-02172-8.