Methods and devices useful for monitoring a patient and for monitoring and displaying the value of a physiological parameter are disclosed. In one embodiment, a user interface for a medical monitoring device is provided. The user interface can have a monitoring screen with a current value screen and a trend screen. The current value screen can displaying a graphical representation of a value of a physiological parameter over time, e.g., over a current time period, and the trend screen can display a graphical representation of a mean value of the physiological parameter over time, e.g., over a historical time period. The time periods can be adjustable. In some embodiments, an out-of-limit condition for the physiological parameter can be indicated with shading. For example, the current value screen can display shading between a trendline representing the value of the physiological parameter and a threshold line, which sets the alarm threshold. The historical value screen can display shading between a trendline representing the value of the physiological parameter and another threshold line. In yet other embodiments, the user interface can provide an event marking screen. The event marking screen can provide the ability to mark events, e.g., delivery of a drug to the patient, adjustment of a sensor, and so on, on a historical trend screen that displays a value of the physiological parameter over time. Such event marking can enable a caregiver to correlate events to a change in a patient's condition as manifested by the physiological parameter.
