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Doyle TA, Schmidt KK, Halverson CME, Olivera J, Garcia A, Shugg TA, Skaar TC, Schwartz PH. Patient understanding of pharmacogenomic test results in clinical care. Patient Educ Couns 2023; 115:107904. [PMID: 37531788 DOI: 10.1016/j.pec.2023.107904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 06/30/2023] [Accepted: 07/15/2023] [Indexed: 08/04/2023]
Abstract
OBJECTIVE Previous research has not objectively assessed patients' comprehension of their pharmacogenomic test results. In this study we assessed understanding of patients who had undergone cytochrome P450 2C19 (CYP2C19) pharmacogenomic testing. METHODS 31 semi-structured interviews with patients who underwent CYP2C19 testing after cardiac catheterization and had been sent a brochure, letter, and wallet card explaining their results. Answers to Likert and binary questions were summarized with descriptive statistics. Qualitative data were analyzed using a grounded theory approach, with particular focus on categorization. RESULTS No participants knew the name of the gene tested or their metabolizer status. Seven participants (23%) knew whether the testing identified any medications that would have lower effectiveness or increased adverse effects for them at standard doses ("Adequate Understanding"). Four participants (13%) read their results from the letter or wallet card they received but had no independent understanding ("Reliant on Written Materials"). Ten participants remembered receiving the written materials (32%). CONCLUSION A majority of participants who had undergone CYP2C19 PGx testing did not understand their results at even a minimal level and would be unable to communicate them to future providers. PRACTICE IMPLICATIONS Further research is necessary to improve patient understanding of PGx testing and their results, potentially through improving patient-provider communication.
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Affiliation(s)
- Tom A Doyle
- Indiana University Center for Bioethics, Indianapolis, IN, USA; Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Karen K Schmidt
- Indiana University Center for Bioethics, Indianapolis, IN, USA; Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Colin M E Halverson
- Indiana University Center for Bioethics, Indianapolis, IN, USA; Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Jesus Olivera
- Indiana University Center for Bioethics, Indianapolis, IN, USA; Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Abigail Garcia
- Indiana University Center for Bioethics, Indianapolis, IN, USA; Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Tyler A Shugg
- Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Todd C Skaar
- Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Peter H Schwartz
- Indiana University Center for Bioethics, Indianapolis, IN, USA; Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA; Department of Philosophy, Indiana University-Purdue University, Indianapolis, IN, USA.
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