BACKGROUND: Ethical decision-making is a cornerstone of intensive care and emergency medicine. In acute scenarios, clinicians often face rapid, high-stakes decisions concerning life and death, made more challenging by time constraints and incomplete information. These decisions are further complicated by economic constraints, limited resources, and evolving technological capabilities. QUESTION: What decision-making aids and factors can be employed in ethical borderline cases within intensive care medicine? RESULTS: Fundamental ethical principles such as patient autonomy, beneficence, non-maleficence, and justice form the basis for medical treatment decisions. Evaluating the patient's will through advanced directives or proxy consensus is crucial, although advanced directives can be ambiguous. Assessing quality of life is increasingly important, with instruments such as the Clinical Frailty Scale (CFS) being utilized. For older patients, a holistic approach is recommended, focusing on overall health rather than chronological age. In patients with advanced underlying diseases, a multidisciplinary dialogue is essential. DISCUSSION: Decision-making in intensive care medicine requires careful consideration of medical, ethical, and individual factors. Despite advances in artificial intelligence and prognostic models, human judgment remains crucial. During periods of resource scarcity, ethically sound triage protocols are required. The challenge lies in applying these principles and factors in clinical practice while respecting the individuality of each patient.