BackgroundCorrect electrode placement and proper skin preparation for cardiac telemetry monitoring of patients at risk for arrhythmias increase the quality of the arrhythmic surveillance. Inconsistent arrhythmia surveillance can compromise patient safety and care outcomes. An inspection of international literature demonstrates that nurses generally do not adhere to cardiac monitoring standards.AimThe aims of this study were to determine cardiovascular nurses' knowledge of and adherence to practice standards for cardiac surveillance and whether their knowledge and practice improves over time.Study designA comparative study design was applied, and data were obtained by survey methodology.MethodsNurse delegates at the Annual National Congress on Cardiovascular Nursing in Norway completed surveys in 2011 and 2017 (delegates from 44 and 38 hospitals, respectively).ResultsIn total, 363 cardiac nurses (70%) responded to the questionnaires. Of these, 95% were female, with a mean age of 41 years. In 2011, 97% of participants were unaware of international practice standards. However, by 2017 unawareness decreased to 78% (P < .001). Despite their lack of knowledge of practice standards, 94% of participants often or always prepared patients' skin for telemetry; this improved from 2011 to 2017 (P = .001). Overall, 73% of nurses never or seldom scrubbed or washed the patients' skin before electrode placement, and 38% of the electrodes were misplaced. In 2011, 49% of nurses used protective telemetry covers; this increased to 80% in 2017 (P < .001). Overall, 64% always informed patients of the purpose of cardiac monitoring.ConclusionA significant percentage of nurses fail to adhere to recommendations for electrode placement, skin preparation and providing patients with telemetry information. In order to raise the quality of arrhythmic surveillance, investment in educational programmes in cardiac telemetry monitoring is required.Relevance to Clinical PracticeImproved in‐hospital telemetry practice is required to ensure patient safety and better care outcomes.