This study aimed to explore the potential benefits and safety considerations of combining ultrasound-guided quadratus lumborum block (QLB) with low-dose spinal anesthesia (LDSA) versus general anesthesia (GA) for individuals undergoing percutaneous nephrolithotomy (PCNL). This prospective randomized controlled trial included 70 adult patients undergoing PCNL, divided into Group Q (QLB + LDSA, n = 35) and Group G (GA, n = 35). Primary outcomes included postoperative pain, assessed using the Visual Analog Scale (VAS), and opioid consumption, measured by pethidine usage. Secondary outcomes included patient satisfaction, stone clearance rates, hemoglobin and creatinine changes, and adverse events. Multivariate regression analysis identified predictors of outcomes. Postoperative pain scores were significantly lower in Group Q during the first 8 postoperative hours (all p < 0.001). Median pethidine consumption was lower in Group Q (70 mg vs. 105 mg, p < 0.001). Group Q demonstrated superior patient satisfaction, with 82.8% of individuals rating their experience as "satisfied" or "very satisfied," markedly exceeding the 8.6% observed in Group G (p < 0.001). Stone clearance outcomes were comparable between the groups, with no statistically significant difference in residual stone burden (p = 0.348). No significant differences were observed in postoperative hemoglobin levels (Group Q: 11.5 ± 0.6 g/dL vs. Group G: 11.5 ± 0.6 g/dL, P = 1.0) or serum creatinine levels (Group Q: 1.0 ± 0.2 mg/dL vs. Group G: 1.0 ± 0.2 mg/dL, p = 0.611). In PCNL procedures, QLB in conjunction with LDSA demonstrates superior postoperative analgesia, reduced opioid requirements, and improved patient satisfaction while maintaining comparable perioperative and urological outcomes.

A 1939 German publication on a search for novel synthetic atropine substitutes reported that 'Substanz III', named Dolantin (now generically known as pethidine and meperidine), was found coincidentally to also have morphine-like, albeit markedly weaker, analgesic properties. With a chemical structure not obviously related to morphine, it was thus an 'accidental opioid' and was soon successfully marketed in many countries for pain relief. By the 1970s, continuing advances in analytical chemistry were enabling pharmacokinetic studies of countless drugs. Among opioid analgesic agents, pethidine's larger dosing requirements made it suitable for such research, which was performed in healthy volunteers and patients with various doses and routes of administration, with some reports also including pharmacological responses. Standard postoperative intramuscular pethidine administration revealed steep and unpredictable plasma concentration-analgesic response relationships characterised by marked variability between patients. Novel computer-designed intravenous infusions based on typical pethidine pharmacokinetic data were trialled to replace intramuscular injections. These infusions improved the reliability of postoperative pain management but could not overcome the variability in individual patient requirements. This limitation accelerated the development of empirical 'patient-controlled analgesia' techniques, initially with pethidine, and subsequently with other opioid analgesic agents, thereby enabling personalised pain management. The 1970s' discovery of spinal opioid receptors and mechanisms led to neuraxial pethidine administration being investigated and subsequently integrated into standard clinical practice. Although pethidine has now been superseded in many countries, it served as an important 'model' drug to investigate how to improve the use of opioid analgesic agents for the management of severe pain.

Ultrasonography is a widely used diagnostic imaging technique in veterinary medicine and has gaining ground in wild animal medicine. This case series describes the ultrasonographic anatomy of abdominal organs and testicles in eleven adult captive crab-eating foxes (Cerdocyon thous) from the Brazilian Cerrado. All animals were considered clinically healthy based on physical examination and laboratory testing, including complete blood count and serum biochemistry. The animals were sedated with meperidine, acepromazine and propofol prior to ultrasonographic examination. The urinary bladder lumen was anechoic and homogeneous, with a mean wall thickness of 0.17 cm. The prostate was visualized caudal to the bladder, with mean length and height of 1.61 cm and 1.21 cm, respectively. The spleen showed homogeneous hyperechoic parenchyma with a mean thickness of 1.20 cm. Kidneys demonstrated well-defined corticomedullary differentiation, with mean lengths of 4.08 cm (left) and 4.15 cm (right). The liver displayed smooth margins, uniform echotexture, and intermediate echogenicity relative to the spleen and renal cortex. The gallbladder appeared as an anechoic structure with a mean wall thickness of 0.10 cm. The stomach wall measured 0.24 cm, intestinal wall thickness averaged 0.35 cm in the small intestine and 0.15 cm in the large intestine. Testicles displayed an oval shape with homogeneous echotexture and a visible mediastinum testis. Overall, the sonographic features observed were consistent with those reported in domestic dogs. These results aid to establishing reference ultrasonographic parameters for Cerdocyon thous and may facilitate clinical evaluation and diagnostic imaging in this species.

Meperidine, morphine, and sufentanil exhibit a critical duality in contemporary medicine: while serving as essential clinical anesthetics with well-established therapeutic value, they have paradoxically contributed to a severe public health crisis due to their widespread abuse. In response to the pressing demands of contemporary anesthetic regulation and drug control initiatives, this study employs a home-made atmospheric pressure corona discharge ion mobility spectrometer. By introducing an ammonia dopant to suppress the ionization of specific proton-binding sites in morphine, the technical challenge of overlapping mobility peaks between meperidine and morphine is overcome. Experimental results reveal that under optimized drift tube temperature conditions (40-100°C), the drift time of these anesthetics decreases as temperature rises, while the signal intensities of meperidine exhibit a pronounced increasing trend. Through an exploration of signal response characteristics during multi-component simultaneous detection, the competitive ionization mechanisms among the three anesthetics are comprehensively elucidated. This research provides significant value by successfully applying the method of ammonia dopant to additional opioid anesthetic compounds while simultaneously developing and refining the methodological approach.

Intravenous meperidine during labor can interfere with nursing and maternal use of meperidine during breastfeeding can sedate the infants. Postpartum intravenous meperidine can slightly reduce the willingness of infants to breastfeed. Patient-controlled epidural analgesia postpartum appears to be free from these effects. Other agents, such as fentanyl, are preferred for intravenous or intramuscular use, especially while nursing a newborn or preterm infant.[1-3] A single dose of meperidine for anesthesia or conscious sedation usually does not cause problems in older breastfed infants.[4,5] When a combination of anesthetic agents is used for a procedure, follow the recommendations for the most problematic medication used during the procedure. Maternal use of oral opioids during breastfeeding can cause infant drowsiness, which may progress to rare but severe central nervous system depression. Newborn infants seem to be particularly sensitive to the effects of even small dosages of narcotic analgesics. If the mother of a newborn requires meperidine, it is not a reason to discontinue breastfeeding; however, once the mother's milk comes in, it is best to provide pain control with a nonnarcotic analgesic and limit maternal intake of meperidine to 2 to 3 days at a low dosage with close infant monitoring. If the baby shows signs of increased sleepiness (more than usual), difficulty breastfeeding, breathing difficulties, or limpness, a physician should be contacted immediately. Withdrawal symptoms can occur in breastfed infants when maternal administration of an opioid analgesic is stopped, or when breastfeeding is stopped.

Purpose: To compare the effectiveness and report on oral sedation-related events using three different multiagent regimens in pediatric patients up to 24 hours post-discharge. Methods: Sixty healthy 3- to 7-year-old patients were randomly allocated to 1 of 3 groups. Group 1 received midazolam, meperidine, and hydroxyzine (MZ/M/H; n equals 20). Group 2 received meperidine and hydroxyzine (M/H; n equals 20). Group 3 received midazolam and hydroxyzine (MZ/H; n equals 20). Nitrous oxide inhalation was concurrently used in all groups. After completion of sedation, the treating dentist answered survey 1 regarding the preoperative period until discharge. Parents completed 2 phone interviews at 8 and 24 hours post-discharge (surveys 2 and 3). Data analysis included chi-square, 1-way analysis of variance, and post-hoc tests (P<0.05). Results: Over-all, the 3 regimes were effective (90%). Group 1 showed a significant increase in slurring/difficulty speaking post-operatively and up to discharge (P=0.04). Groups 1 and 3 exhibited significantly greater difficulty walking on their own at discharge (P=0.02). Groups 1 and 2 experienced significantly increased lethargy (P=0.02) within 8 hours post-discharge. Overall musculoskeletal effects were significantly less prior to discharge in Group 2 (P=0.02), while gastrointestinal upset was significantly more in Group 1 at 24 hours post-discharge (P=0.01). Conclusions: This randomized clinical trial demonstrated that oral sedation regimens containing different combinations of midazolam, meperidine, and hydroxyzine are effective and relatively safe. Postoperative monitoring remains essential up to 24 hours. Longer postoperative monitoring may be required when a 3-medication regimen is used.