SufentanilOhmefentanylOpioid: Opioids are substances that act on the nervous system in a similar way to opiates such as morphine and codeine. In a medical context the term usually indicates medications that are artificially made rather than extracted from opium.BupivacaineSpinal anaesthesia: Spinal anaesthesia (or spinal anesthesia), also called spinal analgesia, spinal block or subarachnoid block (SAB), is a form of regional anaesthesia involving injection of a local anaesthetic into the subarachnoid space, generally through a fine needle, usually 9 cm long (3.5 inches).Local anesthetic: Local anesthetic (LA) is a medication that causes reversible absence of pain sensation, although other senses are often affected as well. Also, when it is used on specific nerve pathways (local anesthetic nerve block), paralysis (loss of muscle power) can be achieved as well.Nordli's Cabinet: Nordli's Cabinet governed Norway between 15 January 1976 and 4 February 1981. The Labour Party cabinet was led by Odvar Nordli.Cervical dilation: Cervical dilation (or cervical dilatation) is the opening of the cervix, the entrance to the uterus, during childbirth, miscarriage, induced abortion, or gynecological surgery. Cervical dilation may occur naturally, or may be induced by surgical or medical means.Placebo-controlled study: Placebo-controlled studies are a way of testing a medical therapy in which, in addition to a group of subjects that receives the treatment to be evaluated, a separate control group receives a sham "placebo" treatment which is specifically designed to have no real effect. Placebos are most commonly used in blinded trials, where subjects do not know whether they are receiving real or placebo treatment.Paracervical block: A paracervical block is an anesthetic procedure used in obstetrics and gynecology, in which a local anesthetic is injected into between two to six sites at a depth of 3–7 mm alongside the vaginal portion of the cervix in the vaginal fornices.paracervical block By Robert Nadelberg.Preventive analgesia: Preventive analgesia is a practice aimed at reducing short- and long-term post-surgery pain. Activity in the body's pain signalling system during surgery produces "sensitization"; that is, it increases the intensity of post-operative pain.IsobutyramideUremic pruritus: Uremic pruritus (also known as uraemic pruritus or renal pruritus) is caused by chronic kidney failure and is the most common internal systemic cause of itching.James, William; Berger, Timothy; Elston, Dirk (2005).