Thromboembolic deterrent stockings fail to prevent hypotension associated with spinal anaesthesia for elective caesarean section.

This study was carried out to determine whether the use of thrombo-embolic deterrent (TED) stockings, in combination with an intravenous crystalloid preload, would prevent hypotension following spinal anaesthesia for caesarean section. Fifty parturients undergoing elective caesarean section under spinal anaesthesia were randomly allocated into two groups. TED stockings were applied to the study group 1 h before spinal anaesthesia but none were applied to the control group. Both groups received a crystalloid preload of 15 ml kg(-1) over 15 min before spinal injection. Significant hypotension, defined as an absolute value of systolic arterial pressure (SAP) of less than 90 mmHg and a decrease of more than 20% from baseline SAP was treated with 3 mg bolus of ephedrine as required. The difference in SAO between the two groups was not statistically significant. In the control group, 80% of parturients required ephedrine as opposed to 56% in the TED group; a difference that was also not statistically significant.

Identification of epidural space by drip method.

In 100 pregnant women, identification of the epidural space was performed by a modified drip method. A saline infusion was prepared, leaving the distal 40 cm of infusion tubing full of air, and then attached to the hub of a Tuohy needle. Accurate identification of the epidural space was accomplished in less than one minute in 95% of cases. There were no unintentional dural punctures. This technique has advantages over the hanging drop and the manual loss of resistance techniques.

Effect of needle puncture on morphine and lidocaine flux through the spinal meninges of the monkey in vitro. Implications for combined spinal-epidural anesthesia.

BACKGROUND: Combined spinal-epidural anesthesia is a technique growing in popularity. However, there have been no attempts to investigate the risk of epidural drug reaching the subarachnoid space in high concentration by passing through the meningeal hole left by the spinal needle. This study begins to address this question by quantitating the flux of morphine and lidocaine through the spinal meninges of the monkey in vitro after puncture with three different-sized needles. METHODS: Spinal meningeal tissue from anesthetized monkeys was mounted in a diffusion cell and drug flux was measured through intact tissue and through tissue punctured with a 27-G Whitacre, a 24-G Sprotte, and an 18-G Tuohy needle. RESULTS: The flux of morphine through the meningeal tissue was significantly increased by puncture with each of the study needles. The flux of lidocaine was significantly increased only by puncture with the 24-G Sprotte and 18-G Tuohy needles. The flux of morphine through intact tissue was less than the flux of lidocaine through intact tissue. In contrast, the flux of morphine and lidocaine were the same through tissue punctured with the study needles. The magnitude of the drug flux through the needle puncture was a function of the diameter of the study needle. CONCLUSIONS: Epidural anesthesia after accidental or intentional puncture of the spinal meninges has occasionally resulted in high spinal blocks and total spinal anesthesia. This study suggests that drug movement through the meningeal hole is responsible for this complication and that the risk may be decreased by using the smallest possible needle to puncture the meninges.

Audit standards in ectopic pregnancy.

Due to a combination of increasing public awareness and improved diagnostic techniques, women now present to the clinician early in pregnancy. The majority of women with an ectopic pregnancy are haemodynamically stable. This enables the gynaecologist to consider several management options, such as expectant, medical or laparoscopic surgical treatment rather than just the conventional open surgical approach. This review article examines current literature on the management of ectopic pregnancy and proposes audit standards to be used in the diagnosis and optimal treatment of ectopic pregnancy. It is hoped that this would then enable meaningful audit and review of current clinical practice, leading to improved patient outcome.

A morphological and immunological study of human placental bed biopsies in miscarriage.

Placental bed biopsies were examined in three groups of pregnant women for maternal vascular response to placentation as well as for the presence of cells associated with local immunosuppression activity. In the group of women undergoing legal abortion, the histological appearance of trophoblastic invasion was normal in all but one, and the proportion of immunosuppressor cells was also normal. In the missed miscarriage group the histological appearances were abnormal except in one patient. In women with a history of recurrent miscarriage who had miscarried after immunization, placentation was normal in some and defective in others. Immunosuppressor cells appeared to be diminished in number, although there was no correlation between the cytotoxic status of their sera and their pregnancy outcome.