Reducing sensory input in critically ill patients: are eyemasks a blind spot?

colleagues [1] reporting that earplugs may be useful in the prevention of delirium in non-ventilated ICU patients. Unfortunately, they did not report any potentially negative effects of earplugs related to sensory deprivation for example, restlessness, discomfort, or anxiety. In non-ventilated critical care patients the combination of earplugs and eyemasks were effective to improve sleep [2], and the use of eyemasks, in healthy volunteers, in a simulated ICU environment led to improved nighttime sleep and higher nocturnal melatonin levels [3]. Whether or not these positive results also apply to intubated ICU patients is not known and the mentioned possible disadvantages might especially occur in this vulnerable patient group. Nevertheless, the Dutch guideline on delirium management states that the use of nighttime eyemasks should be considered [4]. As the use of eyemasks in intubated patients could very well lead to a feeling of sensorial deprivation and its feasibility in critically ill patients is not clear, we analyzed 18 ICU patients who were offered the choice of wearing a nightmask from 10 p.m. to 6 a.m. (Table 1). The need for informed consent was waived since the use of eyemasks is a part of national delirium guidelines and participation was on a voluntary basis. Eleven patients (61%) were willing to wear a nightmask on average on 28% (median 4 nights, range 1 to 5) of nights on the ICU. In these patients self-perceived quality of sleep, using a visual analog scale (VAS), improved from 6.6 (5.9 to 8.2) to 7.5 (7.0 to 8.0) (P = 0.041) when the mask was worn. In 72% of cases, the mask was refused or taken off prematurely due to restlessness (30%), discomfort (20%), or anxiety (11%). While eyemasks might improve sleep in selected patients, it also may lead to feelings of discomfort and anxiety in mechanically ventilated ICU patients and there fore its standardized use should be used with caution and only on a voluntary basis in this specific group.