Despite increased use of ambulatory surgery, few data exist regarding
patient recovery patterns and home-readiness. We prospectively identif
ied the pattern of home-readiness, the persistent symptoms after surge
ry, and the factors that delay discharge after home-readiness criteria
are satisfied. Five hundred patients were scored by the same investig
ator using the Postanesthetic Discharge Scoring System (PADSS) every 3
0 min, commencing 30 min after surgery, until the PADSS score was grea
ter than or equal to 9. The same investigator telephoned each patient
24 h after discharge to administer a standardized questionnaire so tha
t postoperative symptoms could be identified. Eighty-two percent of pa
tients were discharged 2 h and 95.6% 3 h after surgery. These patients
could have been discharged earlier. After home-readiness criteria wer
e satisfied, some patients had delayed discharge because of the unavai
lability of immediate escorts or the recurrence of pain. Persistent sy
mptoms delaying discharge occurred in 4.4% of patients. Patients who u
nderwent certain ambulatory surgical procedures, such as laparoscopy o
r orthopedic and general surgery, had a sixfold increased risk of deve
loping persistent symptoms in the ambulatory surgery unit. The time to
home-readiness was 2.5-fold longer and the incidence of 24-h postoper
ative symptoms, two- to eightfold higher in the group with persistent
symptoms in the ambulatory surgery unit. In summary, periodic objectiv
e evaluation of home-readiness revealed that the majority of patients
would achieve a satisfactory score on or before 2 h after surgery. The
time to home-readiness by objective evaluation correlated with the ty
pe of surgery. Most delays after satisfactory home-readiness scores we
re reached were due to nonmedical reasons. Patients with persistent po
stoperative symptoms in the ambulatory surgery unit correlated with in
creased 24-h postoperative symptoms.