Nursing based evidence: moving beyond evidence-based practice in mental health nursing

Various authors suggest mental health nursing is dominated by knowledge borrowed from psychiatry, pharmacology and the behavioural sciences. These disciplines favour knowledge developed using quantitative methodologies so they and evidence-based practice (EBP) and evidence-based nursing (EBN), increasingly called for in mental health nursing, fit seamlessly together. Nevertheless, as these movements dismiss qualitative approaches to knowledge (evidence) development, I argue against the move toward EBP/EBN in mental health nursing. This is because the specialty's primary interests - human experiences of illness/health care and human relationships, often do not lend themselves to being quantitatively researched. Using nursing examples, I demonstrate how qualitative research, wholly unacceptable in relation to EBP/EBN quality of evidence scales, is indispensable to mental health nursing. The need for evidence arising from qualitative research in no way precludes the need for quantitatively derived evidence. Indeed, the specialty's twofold interest - the work of nurses with clients and the explication of phenomena which inform practice, require diverse knowledge and thus, diverse research approaches. This twofold interest defines the area of mental health nursing practice, and knowledge informing it is referred to as nursing based evidence (NBE). Because it values multiple approaches to knowledge development, NBE provides a way to articulate the specialty's distinct contribution to the health care of people experiencing mental illness and advances mental health nursing.