Betran AP, Ye J, Moller A-B et al (2021) Trends and projections of caesarean section rates: global and regional estimates. BMJ Glob Health 6:e005671

Article  PubMed  PubMed Central  Google Scholar 

Uppal V, Retter S, Casey M et al (2020) Efficacy of intrathecal fentanyl for cesarean delivery: a systematic review and meta-analysis of randomized controlled trials with trial sequential analysis. Anesth Analg 130:111–125

Article  PubMed  Google Scholar 

Roofthooft E, Joshi GP, Rawal N, Van de Velde M (2021) PROSPECT Working Group of the European Society of Regional Anaesthesia and Pain Therapy and supported by the Obstetric Anaesthetists’ Association. PROSPECT guideline for elective caesarean section: updated systematic review and procedure-specific postoperative pain management recommendations. Anaesthesia 76(5):665–680

Article  CAS  PubMed  Google Scholar 

Günaydin B, Güngör İ, İzdeş S (2012) Final baricity of ropivacaine or bupivacaine combined with fentanyl for intrathecal administration. Turkish Journal of Medical Sciences 42:942–945

Google Scholar 

Imbelloni LE, Moreira AD, Gaspar FC et al (2009) Assessment of the densities of local anesthetics and their combination with adjuvants: an experimental study. Rev Bras Anestesiol 59:154–165

Article  CAS  PubMed  Google Scholar 

Heller AR, Zimmermann K, Seele K et al (2006) Modifying the baricity of local anesthetics for spinal anesthesia by temperature adjustment: model calculations. The Journal of the American Society of Anesthesiologists 105:346–353

CAS  Google Scholar 

Richardson MG, Wissler RN (1996) Density of lumbar cerebrospinal fluid in pregnant and nonpregnant humans. The Journal of the American Society of Anesthesiologists 85:326–330

CAS  Google Scholar 

Practice guidelines for obstetric anesthesia (2016) an updated report by the American Society of Anesthesiologists Task Force on Obstetric Anesthesia and the Society for Obstetric Anesthesia and Perinatology. Anesthesiology 124(2):270–300

Google Scholar 

Seki H, Shiga T, Mihara T et al (2021) Effects of intrathecal opioids on cesarean section: a systematic review and Bayesian network meta-analysis of randomized controlled trials. J Anesth 35(6):911–927

Article  PubMed  Google Scholar 

Gray JR, Fromme GA, Nauss LA et al (1986) Intrathecal morphine for post-thoracotomy pain. Anesth Analg 65:873–876

Article  CAS  PubMed  Google Scholar 

Desai N, Gardner A, Carvalho B (2019) Labor epidural analgesia to cesarean section anesthetic conversion failure: a national survey. Anesthesiol Res Pract 2019:6381792

PubMed  PubMed Central  Google Scholar 

Chekole AT, Kassa AA, Yadeta SA, Aytolign HA (2022) Comparison of sequential versus pre mixed administration of intrathecal fentanyl with hyperbaric bupivacaine for patients undergoing elective caesarean section at Zewditu memorial referral hospital: a prospective cohort study. Ann Med Surg (Lond) 74:103313

PubMed  Google Scholar 

Keera AAI, Elnabtity AMA (2016) Two syringe spinal anesthesia technique for cesarean section: a controlled randomized study of a simple way to achieve more satisfactory block and less hypotension. Anesth Essays Res 10:312

Article  PubMed  PubMed Central  Google Scholar 

Ginosar Y, Mirikatani E, Drover DR et al (2004) ED50and ED95of intrathecal hyperbaric bupivacaine coadministered with opioids for cesarean delivery. The Journal of the American Society of Anesthesiologists 100:676–682

CAS  Google Scholar 

Ousley R, Egan C, Dowling K, Cyna A (2012) Assessment of block height for satisfactory spinal anaesthesia for caesarean section. Anaesthesia 67:1356–1363

Article  CAS  PubMed  Google Scholar 

Morgan P, Lo J, Halpern S (1999) The development of a maternal satisfaction scale for caesarean section. Int J Obstet Anesth 8:165–170

Article  CAS  PubMed  Google Scholar 

Desai S, Lim Y, Tan C, Sia A (2010) A randomised controlled trial of hyperbaric bupivacaine with opioids, injected as either a mixture or sequentially, for spinal anaesthesia for caesarean section. Anaesth Intensive Care 38:280–284

Article  CAS  PubMed  Google Scholar 

Kocarev M, Watkins E, McLure H et al (2010) Sensory testing of spinal anaesthesia for caesarean section: differential block and variability. Int J Obstet Anesth 19(3):261–265

Article  CAS  PubMed  Google Scholar 

Sachan P, Kumar N, Sharma J (2014) Intrathecal clonidine with hyperbaric bupivacaine administered as a mixture and sequentially in caesarean section: a randomised controlled study. Indian J Anaesth 58:287

Article  CAS  PubMed  PubMed Central  Google Scholar 

Hare GM, Ngan J (1998) Density determination of local anaesthetic opioid mixtures for spinal anaesthesia. Can J Anaesth 45:341–346

Article  CAS  PubMed  Google Scholar 

Wang C, Chakrabarti MK, Whitwam JG (1993) Specific enhancement by fentanyl of the effects of intrathecal bupivacaine on nociceptive afferent but not on sympathetic efferent pathways in dogs. The Journal of the American Society of Anesthesiologists 79:766–773

CAS  Google Scholar 

Riley ET, Walker D, Hamilton CL, Cohen SE (1997) Intrathecal sufentanil for labor analgesia does not cause a sympathectomy. The Journal of the American Society of Anesthesiologists 87:874–878

CAS  Google Scholar 

Gaiser RR, Cheek TG, Gutsche BB (1998) Comparison of three different doses of intrathecal fentanyl and sufentanil for labor analgesia. J Clin Anesth 10:488–493

Article  CAS  PubMed  Google Scholar 

Grant GJ, Susser L, Cascio M et al (1996) Hemodynamic effects of intrathecal fentanyl in nonlaboring term parturients. J Clin Anesth 8:99–103

Article  CAS  PubMed  Google Scholar 

Kanwariya A, Khatri C, Janweja S (2020) Intrathecal administration of fentanyl with hyperbaric bupivacaine either a mixture or sequentially in elective caesarean section: a randomised single blind study. J Clin of Diagn Res 14(6):UC06-UC10

Google Scholar 

Akerman N, Saxena S, Wilson R, Columb M, Lyons G (2005) Effect of intrathecal diamorphine on block height during spinal anaesthesia for caesarean section with bupivacaine. BJA: British Journal of Anaesthesia 94:843–847

Article  CAS  PubMed  Google Scholar 

Joshi S, Tailor R, Pandya M, Vachhrajani P (2018) Two syringe technique for spinal anesthesia in cesarean section: a study of a simple way to achieve more satisfactory block, less frequency of hypotension and prolong analgesia. International Journal of Science and Research 7:1984–1988

Google Scholar 

Shivashankar A, Rath P, Iyer SS, Mohan C (2017) Combination of buprenorphine with hyperbaric bupivacaine administered either as a mixture or sequentially for spinal anaesthesia for caesarean section. Indian Journal of Clinical Anaesthesia 4:291–297

Google Scholar 

Barada M, Kanawati S, Rajab O, Naja Z (2021) Subdural injection: a possible cause of loss of consciousness during cesarean section. Journal of Obstetric Anaesthesia and Critical Care 11:46–47

Article  Google Scholar 

Jasinski T, Migon D, Sporysz K et al (2021) The density of different local anesthetic solutions, opioid adjuvants and their clinically used combinations: an experimental study. Pharmaceuticals (Basel) 14(8):801

Article  CAS  PubMed  Google Scholar 

Singh NP, Makkar JK, Jafra A et al (2022) The effect of two groups of intrathecal fentanyl doses on analgesic outcomes and adverse effects in parturients undergoing cesarean delivery: a systematic review and meta-analysis of randomized controlled trials with trial sequential analysis. Int J Obstet Anesth 50:103270

Article  CAS  PubMed  Google Scholar 

Jahanara HSK, Asthana V, Nautiyal R (2020) Comparison of premixed with sequential administration of intrathecal morphine and hyperbaric bupivacaine for lower segment caesarean section. Academia Anesthesiologia International 5:174–178

Article  Google Scholar