The perinatal autopsy

Classification of perinatal deaths: development of the Australian and New Zealand classifications

Classifications of perinatal deaths have been undertaken for surveillance of causes of death, but also for auditing individual deaths to identify suboptimal care at any level, so that preventive strategies may be implemented. This paper describes the history and development of the paired obstetric and neonatal Perinatal Society of Australia and New Zealand (PSANZ) classifications in the context of other classifications. The PSANZ Perinatal Death Classification is based on obstetric antecedent factors that initiated the sequence of events leading to the death, and was developed largely from the Aberdeen and Whitfield classifications. The PSANZ Neonatal Death Classification is based on fetal and neonatal factors associated with the death. The classifications, accessible on the PSANZ website (http://www.psanz.org), have definitions and guidelines for use, a high level of agreement between classifiers, and are now being used in nearly all Australian states and New Zealand.

An evaluation of the autopsy following death in a level IV neonatal intensive care unit

OBJECTIVE

To ascertain the determinants of neonatal autopsy, define clinical errors in the causes of death, and elucidate the possible audit and genetic value of the autopsy following death in a Level IV neonatal intensive care unit (NICU).

METHODS

A review and correlation of clinical and autopsy information in a case series of infants who died during the period 1991-97.

RESULTS

Two hundred and twenty-nine of 4057 infants admitted to the NICU died and 91 (39.7%) underwent an autopsy. The underlying cause of death was significantly different in infants who had an autopsy compared with infants who did not (P = 0.02). The autopsy rate was higher for deaths from miscellaneous causes (52.9%), lethal malformation (46.8%) and infection (45.4%) than deaths from prematurity (25.9%) and asphyxia (19%). Clinical errors in the causes of death were found in 22% of the infants, and in 4.4% a change in management may have been curative or prolonged life. The autopsy had audit value in 26% of infants and genetic value for a single gene (Mendelian) disorder in 4.4%.

CONCLUSIONS

Although the autopsy following death in a Level IV NICU yields potentially useful information in more than one-third of cases, this does not seem sufficient to ensure a high neonatal autopsy rate.

The perinatal autopsy: its conduct and reporting in Australia

OBJECTIVE

To assess the conduct and reporting on death certificates of perinatal autopsies in Australia.

DATA SOURCES

(i) Medical certificates of cause of perinatal death in all States and Territories; (ii) registrations of perinatal deaths in New South Wales in 1985 and 1986.

DATA EXTRACTION

Death certificates are assessed on three criteria: (i) an indication that an autopsy was performed; (ii) an indication whether the stated causes of death were based on autopsy findings; and (iii) an indication whether the clinical diagnosis was confirmed by autopsy.

DATA SYNTHESIS

Perinatal death certificates give insufficient information in all three areas. Assessment of the accuracy and usefulness of autopsies requires better information.

CONCLUSION

A two-part death certificate is suggested. The first part would report clinical diagnoses of the causes of death. The second part would compare these results with those of any autopsy.

The perinatal autopsy: a contemporary approach

As autopsy rates in general hospitals decline, interest in the perinatal autopsy continues to rise, reflecting the emergence of a vigorous specialty growing in parallel with fetal medicine, prenatal diagnosis and clinical genetics. Perinatal autopsies are best carried out in tertiary centres which provide these services. Meticulous documentation, flexibility of technique, intelligent use of laboratory tests and wide systematic histopathologic sampling are emphasized. Microbiologic examination is of particular value when carried out by a laboratory having a special interest in genital tract and perinatal pathogens. Karyotyping must be selective if resources are to be conserved and is most productive when there are multiple malformations. Perinatal autopsy is not complete without examination of the placenta and significant lesions should be clearly distinguished from curiosities and from changes secondary to fetal death. The pathologist's wider contribution to perinatal medicine includes providing high quality data to epidemiology units and auditing committees, contributing to the multidisciplinary management of prenatally diagnosed fetal abnormalities, monitoring iatrogenic disease patterns and supporting the process of perinatal grief management. Special problems and diagnostic challenges are to be found when investigating sudden, unexplained intrauterine fetal death, hydrops, bone dysplasias and complicated multiple pregnancies.