Introduction

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When an urgent caesarean section is performed, it is widely advocated that the interval between the decision to operate and delivery of the baby should be less than 30 minutes. The recommendation states that a unit should be able to be ready to perform a caesarean section within 30 minutes, implying that the interval between decision and delivery may be a little longer.^1-3 The clinical negligence scheme for trusts (CNST) has recommended that for units to achieve level 3 for a risk management accreditation they will need to audit their performance against this standard.⁴ The clinical justification for this arbitrary time standard does not come from trials or even from observational studies in humans but from a "pragmatic" approach.⁵ Preparing a woman for caesarean section is a complicated multidisciplinary task with inherent risks for mother and baby (box). Since 1993 our unit has audited the time from decision to perform a caesarean section to delivery of the baby, with a continuous audit since May 1997. This paper describes that process and discusses its implications.

	Participants, methods, and interventions

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The audit took place in a large district general hospital delivering about 5500 women a year. The rate of emergency caesarean section during the period of the audit was 9-12%. The first audit was conducted from September to November 1993. There was no clear classification as to urgency, so this included all non-elective procedures. This led to a failure of communication between professionals about urgency. Some delays were attributed to the time taken to prepare for spinal anaesthesia, and this was tackled by arranging for prepacked equipment for spinal anaesthesia to be available. After the first cycle it was agreed at a joint meeting with anaesthetists and obstetricians that urgent cases should meet the 30 minute standard and that "semi-urgent" cases should meet a 40 minute standard. Difficulty in agreeing on the categorisation of urgent caesarean section led to a delay before the second audit.

The second audit, in October to December 1995, looked at each element of the process. One of the areas of delay was in moving the patient to theatre. There was organisational uncertainty about whose responsibility this was. The communication of urgency was felt to be poor. On at least three occasions the second theatre was not opened when appropriate. Recommendations were that a second theatre should be opened if there was any concern about the urgency of another caesarean section and that a team approach should be used to move patients to theatre within a target time of 10 minutes. The obstetrician was to tell the anaesthetist of the target time for delivery. The use of a 40 minute category was thought to be confusing so it was dropped.

In the third audit, from April to June 1996, delay in moving the women was highlighted as an issue. It was proposed that consent for the operation could be obtained once the patient had been moved, and it was also felt that increasing a woman's awareness that she might need a caesarean section could reduce the time needed to obtain consent.

From May 1997 we undertook a continuous audit of the time to delivery for caesarean section. The results were posted every three months on the delivery suite to provide feedback and they were discussed every six months at departmental audit meetings. As new registrars started in the unit they were informed of the ongoing audit, their responsibilities, and the need to aim for the 30 minute interval between decision and delivery. The consultant responsible for the delivery suite also initiated discussions about the need to move women swiftly to theatre and to communicate the degree of urgency.

We have used the continuous audit to analyse compliance with the standard in different clinical situations and to determine whether fetal outcome is affected by variance from the standard. All emergency caesarean sections were retrospectively assessed as to the need for delivery within 30 minutes. They were included if the delivery was because of an abnormal fetal heart rate trace, a cord prolapse, or failed instrumental vaginal delivery, or if there were other important concerns such as bleeding that suggested a diagnosis of placental abruption. Differences in outcome were assessed by rates of admission to the special care unit and analysed using the ² test. The reasons for considerable delays (>50 minutes) were analysed separately.

	Results

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During the first cycle 188 cases of emergency section occurred, of which 77 (41%) had a time of under 30 minutes between decision and delivery.

In the second cycle 55 of 107 (51%) cases were considered to need delivery within 30 minutes; 38 of 55 (69%) cases achieved this. A total of 23 (22%) cases were considered to need delivery within 40 minutes; 14 (61%) achieved this.

In the third cycle 58 of 135 (43%) cases needed delivery within 30 minutes; 32 (60%) cases were delivered in 30 minutes and 50 (86%) in 40 minutes. The audit showed that if women were in theatre within 10 minutes then 70% would be delivered within 30 minutes.

During the fourth cycle 721 of 1344 (54%) non-elective caesarean sections needed urgent delivery. Of these, 478 (66%) were delivered within 30 minutes and 637 (88%) within 40 minutes; 29 (4%) were undelivered at 50 minutes. A total of 500 (69%) women got to theatre within 10 minutes; 409 (82%) were delivered in 30 minutes and 485 (97%) in 40 minutes. If it took 10 minutes to get to theatre, only 69/221 (31%) of women were delivered in 30 minutes (P<0.001) and 152/221 (69%) in 40 minutes (P<0.001). Significantly more women were delivered within 40 minutes in 1999 than in 1997 (261/287 v 163/193; P<0.05, table 1). No other differences between years were significant.

Fewer babies were admitted to special care when the interval between decision and delivery was shorter, but not when prematurity was excluded as a reason for admission to special care (tables 2 and 3). Three babies born at 28, 32, and 32 weeks, whose intervals between decision and delivery were 41, 30, and 26 minutes, later died. All babies were in reasonable condition at birth and died when several days old. Six babies born at term needed ventilation. Five had only short term ventilation and had no long term adverse events. The interval between decision and delivery in these cases was 18, 25, 30, 30, and 77 minutes. One baby had signs of hypoxic ischaemic encephalopathy with fits. The mother had had an abruption and the interval between decision and delivery was 20 minutes. The interval between admission and delivery was less than 50 minutes.

Delays of more than 50 minutes stemmed largely from problems in providing anaesthesia or delays in getting the woman to theatre (table 4).

	Discussion

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A caesarean section is a complex multidisciplinary procedure. The Royal College of Obstetricians and Gynaecologists, the Obstetric Anaesthetists Association, the Royal College of Midwives, the Clinical Negligence Scheme for Trusts, and controls assurance standards have recommended that caesarean section should be ready to be performed within 30 minutes.^1-4 This learned body of opinion places a great responsibility on the shoulders of clinicians faced with delivering babies in an emergency. It also provides a large body of evidence to be quoted as suggesting negligent care should a baby be born in suboptimal condition when there has been a delay of more than 30 minutes. Our audit questions whether the standard as established is "reasonable."

Many tasks, some of which are quite complex (see box, p 1330), are needed to perform an emergency caesarean section. The procedure needs at least seven professionalsan anaesthetist and a skilled assistant, an obstetrician and an assistant, a theatre nurse or midwife to assist with the operation, a midwife, and a paediatrician to take the baby. The staff have to be assembled before the necessary complex tasks can be undertaken.

Anaesthesia
One of the major successes in maternal outcome has been that anaesthesia now rarely causes death in women having caesarean section.⁶ Anaesthetists have a primary responsibility to the mother and reasonably guard their right to ensure that the procedure they use is safest for the mother, yet they are expected to do complex tasks under pressure of time. This emphasis on maternal safety may conflict with concerns about the baby. The increased safety of regional anaesthesia has been shown. ^{7 8} Regional anaesthesia is often as quick to administer as general anaesthesia but no randomised controlled trial has looked at the time taken to be ready to start surgery with each method. The move to increased use of regional anaesthesia gives concern that training in obstetric general anaesthesia is threatened.^9-12 The decision to convert to general anaesthesia when there is difficulty with spinal anaesthesia is one that trainees in particular may be increasingly reluctant to make. The rate of failed intubation is higher in the cases now managed with general anaesthesia.⁹

Audits of timing
The audit shows that even with an emphasis on the need to deliver babies promptly in situations where there is concern about fetal wellbeing or maternal wellbeing, the standard as laid down nationally cannot be met in a considerable minority of cases. The question this raises is whether a "reasonable" doctor will fail in this considerable minority. When medicolegal experts review cases retrospectively, knowing the outcome for the baby, then the interval between decision and delivery is certain to be examined. If the arbitrary national standard is used then it may well be that a considerable number of cases will be judged to have received "unreasonable" care. It is probably more appropriate to consider what proportion of cases will be delivered within a particular time from the decision to deliver in a real, day to day situation. Audit of the time between decision and delivery in a teaching unit has produced results similar or worse to ours.¹³

Fetal wellbeing
The main reason for urgent delivery is the presumption that it is important for fetal wellbeing. Although, in our series, there was a difference in the rate of admission to special care when times from decision to delivery were compared, this difference did not hold when premature cases were excluded. The lack of difference in rate of admission for term infants could be for several reasons. It could be because this audit did not include enough babies or did not contain enough genuinely compromised babies. Only one baby would have fulfilled the criteria of the international consensus statement relating cerebral palsy to peripartum events.¹⁵ This is the classic dilemma for obstetricians. If intervention leads to a good outcome it is seen as unnecessary; if it leads to a bad outcome it is seen as too slow or too late.