Methods and aim of the study: The on-scene performance during all miss
ions of the emergency physician-operated rescue helicopter and mobile
intensive care unit based at a large-city hospital over a period of 1
year was retrospectively analysed; 2,254 hospital discharge reports we
re available (92% of the patients treated by the emergency physicians
[n = 2,493]). The following parameters were investigated: reliability
of the primary diagnosis established by the emergency physician (by co
mparison with the discharge diagnoses); initial on-scene therapeutic m
easures; means of transportation (with or without accompanying emergen
cy physician); and level of care of the target hospital. Results. The
most common reasons for a mission were cardiopulmonary diseases (55%),
neurological disorders (18%), and traumatic events (7%). The diagnose
s, therapeutic measures, and mode of transportation were correct in 2,
033 (90%) patients with a discharge report, Severe errors of assessmen
t by the emergency physician were identified in 73 patients (3%): life
-threatening conditions were not recognised and/or grossly incorrect t
herapeutic measures were taken and/or the chosen means of transportati
on was unsuitable, Relative errors in assessment occurred in 4% (n = 8
3): the most crucial diagnosis was not made, but the patient was escor
ted by the emergency physician (without therapeutic errors) to a suita
ble hospital. In 3% (n = 65) of the cases, the patient's condition was
overestimated by the emergency physician as suggested by the obviousl
y exaggerated on-scene therapy. Underestimations of the severity were
most common in patients with cardiopulmonary diseases and increased in
frequency and severity with increasing age and the presence of a conc
omitant neurologic deficit. Underestimations of a severe condition in
younger patients were extremely rare; overestimations of the severity
and consequent overtreatment were particularly common in traumatised p
atients independent of age. Conclusions. In the context of quality man
agement measures, a careful evaluation of on-scene diagnoses, therapeu
tic measures, and decisions made by the emergency physician is a suita
ble procedure for identifying systematic errors. A high percentage of
correct diagnoses and therapy at the emergency site can only be ensure
d by clinically experienced physicians who constantly deal with patien
ts with acutely life-threatening conditions.