الفهرس 
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Abstract
Gestational diabetes mellitus (GDM) is a type of diabetes that presents during pregnancy and usually disappears shortly after a woman gives birth. The latter is an important distinction between GDM and preexisting diabetes, as many pregnant women with previously undiagnosed Type 2 diabetes mellitus are often mistakenly diagnosed as having GDM. Most women who have GDM give birth to healthy babies, especially when they control their blood glucose levels, eat a healthy diet, exercise and keep a healthy weight. In some cases, GDM can negatively affect the pregnancy, the fetus, and the long-term health of both the mother and her child. Spinal anaesthesia (SA) is a frequently used anaesthetic technique for caesarean deliveries. it is important to control the spread of the local anaesthetic through the cerebrospinal fluid (CSF), to provide block that is adequate for the surgery but without producing unnecessarily extensive spread and so increasing the risk of complications. Twenty-three factors can be implicated in the distribution of the local anaesthetic in the spinal space. Assuming that the cerebrospinal fluid (CSF) is the diluent for drugs delivered by the subarachnoid route, the physico-chemical characteristics of CSF are among these 25 factors governing the distribution of local anesthetic solutions in the subarachnoid space and influencing the result of spinal anaesthesia. The aim of this observational prospective case controlled clinical trial is studying the spinal block criteria in diabetic parturient scheduled for C.S compared to the non-diabetic ones. CONCLUSION We concluded in our study that in the patient with diabetes mellitus the dermatomal block after the subarachnoid administration of 2.5mL of 0.5% hyperbaric bupivacaine is different from that observed in the non-diabetic patient, in the form of rabid establishment of the maximum level of sensory and motor blockade in diabetic group and short duration of the level of maximum blockade and the time of total regression, probably as a consequence of the differences in the composition of the CSF.