Delirium
Delirium is a complex state of confusion that can be seen as an acute failure of brain
function. It is characterised by fluctuating deficits in cognition and attention,
dysregulation of emotions and circadian rhythm as well as psychomotor changes.
In intensive care units (ICU) delirium is the most frequent syndromic complication with a
prevalence between 26 - 60%. In mechanically ventilated patients, delirium is even
detected in more than 80%. In elective cardiac surgery patients admitted to the ICU for
postoperative monitoring postoperative delirium presents as a major complication and
occurs in up to 33.5%. Hypoactive delirium outperforms the other two types - hyperactive
and mixed - by far.
Occurrence of delirium is associated with several negative repercussions: Delirious
patients show higher prevalence in morbidity and mortality, longer stays in intensive
care units and the regular ward, as well as impaired cognitive function even months after
the acute illness. The intensity of impairment in cognitive and executive function
correlates with the duration of delirium. Furthermore, delirious patients cause major
additional costs of up to 20% more compared to non-delirious patients.
Although there are several approaches for prevention of deliria in ICUs they are still
highly prevalent causing a high and versatile burden as mentioned above. The several
mainly pharmacological treatment approaches are more to be seen as a symptomatic
treatment than a causal treatment. No groundbreaking prevention or treatment strategy has
been found so far. Therefore, improvement of existing and development of new prevention
strategies is therefore crucial and highly necessary. Further it has to be shown if
prevention of delirium has an effect on clinical outcome.
Between March 2018 and February 2019, 584 patients that met the inclusion criteria of
this study were admitted to the ICU of the University Hospital Basel. Of those, 167
patients (28.6%) developed a delirium within the first 48 hours. After 7 days (168
hours), 277 (47%) had at least once an ICDSC score of ≥4.
Wheat beer
Consumption of alcoholic beverages and therewith beer is widespread in Switzerland.
Healthy effects of moderate beer consumption, especially benefits for prevention of
cardiovascular diseases, are discussed in literature. Beer's major ingredients are water,
hop, malt and yeast.
Alcohol Surveys in US American ICUs showed a pre-existing alcohol use disorder in 16-31%
of ICU patients. Further research showed anamnestic alcohol abuse as a significant risk
factor for development of delirium in ICUs.
Swiss governmental statistics show a widespread alcohol consumption among the Swiss
population: While 82% consume alcohol periodically, 10% drink alcoholic beverages on a
daily and almost 60% at least on a weekly basis. Alcohol consumption increases with age.
In the group of the over 75-year-olds around 40% drink alcohol daily. Around 5% of the
population bear a chronic risky alcohol consumption, 16% get drunk at least once a month.
Thereby beer is one of the most popular beverages.
Alcohol, in alcoholic beverages ethanol, targets multiple central receptors and neural
networks. In habituated individuals an abrupt abstinence from alcohol consumption leads
to generalised central hyperexcitability due to unchecked excitation and impaired
inhibition whereby alcohol withdrawal syndrome (AWS) and delirium tremens (DT) are more
likely to occur. Similar mechanisms can be thought of in patients with moderate,
non-abusive alcohol consumption favouring or causing delirium.
Hop Hop (Humulus lupulus) is a major ingredient of beer. Its main pharmacologically
active constituent is humulone. It bears several health beneficial properties. Its main
impact is the calming effect, which could be shown in a study in healthy nurses when
consuming alcohol-free beer. Improvement of sleep quality and a hypnagogic effect induced
by alcohol-free beer and hop extracts could also be shown in different studies.
On the molecular level the hop's sedating and hypnotic effect could be shown at the
gamma-aminobutyric acid A (GABAA) receptor in a rat model which - positively modulated by
ethanol - shortened sleep onset, increased duration of sleep and decreased the
spontaneous locomotion.
Standard procedure and treatment of delirium at University Hospital Basel (USB)
All patients admitted to the ICU receive a standard care prevention for delirium
including management of causes of delirium such as pain treatment using non-opioid and
opioid analgesics and support of sleep-wake-cycle using Melatonin (Circadin®). The
support in perception, orientation and communication as well as early and regular
mobilisation, general stress reduction and inclusion of patient's next of kin are the
main pillars of standard delirium care prevention.
For assessment of delirium Richmond Agitation Sedation Scale (RASS) and the Intensive
Care Delirium Screening Checklist (ICDSC) are used regularly for delirium recognition
(see "Measurement of delirium and sedation" in section 3.2 for details).
Current standard prevention and treatment of non-withdrawal delirium in the intensive
care unit of the University Hospital Basel depends on the type of delirium.
Hyperactive and mixed delirium (ICDSC ≥ 4, RASS > 0) is treated when RASS ≥ 2 with
Quetiapin (Seroquel®) orally or Haloperidol (Haldol®) intravenously if oral
administration is not possible. As rescue for excessive motoric restlessness
Levomepromazin-neuraxpharm intravenous or intramuscular is used. If restlessness with
RASS ≥ 2 is persistent, syringe pumps with Dexmedetomidine (Dexdor®) or Propofol
(Propofol®) are installed.
For treatment of hypoactive delirium, caring measures including registering and rapid
handling of hunger, thirst, urine or stool urging are of great importance. Further
preventive measures of delirium in general are applied for treatment such as giving
orientation and feeling of safety, support of perception, activation and mobilisation.
For withdrawal delirium a separate treatment algorithm is provided. According to the
intern treatment concept withdrawal delirium presents usually as hyperactive delirium
with agitation tremor, tachycardia, sweating and hallucination in combination. For the
prevention and treatment the same non-pharmacological procedures as described above for
other types of deliria are applied.
Pharmacologically Lorazepam (Temesta®) or Phenobarbital is administered in case of
motoric agitation. In case of conducting oneself in an endangering way for the patient
itself or others a Propofol perfusor might be installed. Additionally, Clonidine
(Catapressan®) is administered when strong vegetative symptoms occur. As a rescue
treatment for most intense motoric agitation Levomepromazin-neuraxpharm is administered.
For concomitant psychosis Haloperidol (Haldol®) is foreseen for its treatment. Alongside
an early start of nutritional therapy as well as substitution of vitamins and minerals
are important.
Research question
The BABE-D clinical trial wants to provide answers to the question if delirium in
critically ill patients can be prevented or reduced in duration, as well as if intensity
of agitation can be reduced by regularly administering a moderate amount of beer.