Regional blockade for delivery in women with scoliosis or previous spinal surgery

From Rib Hump to Baby Hump-Common Questions of Patients Suffering from and Undergoing Treatment for Scoliosis-A Comprehensive Literature Review

Background: Scoliosis, the most prevalent spinal deformity in children, is often associated with adolescent idiopathic scoliosis (AIS). Curves surpassing 50 degrees can deteriorate, especially thoracic curves, leading to pulmonary limitations. Surgical intervention is usually advised for curvatures exceeding 50 degrees to halt further progression. Severe AIS is notably more frequent in females, yet knowledge regarding subsequent pregnancies and associated risks is scarce. Female patients often inquire about conception, pregnancy, labor, and future back pain (BP) concerns. Reports on the long-term outcomes after pediatric AIS treatment and pregnancy consequences remain limited. Uncertainty looms over the likelihood of increased back pain (BP), cesarean sections (CSs), or other pregnancy-related issues following surgical AIS management. In this investigation, an attempt was made to scrutinize the existing research on individuals afflicted with scoliosis who received either conservative or surgical treatment, with the aim of delineating crucial and pragmatic findings that can serve as a compass for spine surgeons when counseling young patients with adolescent idiopathic scoliosis regarding the ailment, its repercussions, the available treatment modalities, and the associated outcomes. A comprehensive analysis pinpointed the optimal data at hand. Consequently, the primary objective of this investigation was to assess the patient-reported and clinical consequences in scoliosis patients who have undergone segmental posterior fusion and subsequently conceived. Conclusions: While the majority of individuals with AIS are capable of conceiving and bearing children, they may encounter greater challenges in fertility than healthy women unaffected by AIS. Pregnant women with a prior history of spinal fusion for AIS can undergo pregnancy and childbirth with no significant escalation in perinatal complications. Women who have undergone surgical procedures for AIS have been observed to exhibit a prevalence of back pain comparable with that of healthy pregnant women; however, a higher incidence of low back pain is evident when spinal fusion is extended to the L3 or L4 vertebra. Although back pain is a common occurrence in pregnant women with AIS, the spinal alterations induced by pregnancy are typically minor and transient. In comparison with healthy women, individuals with a history of spinal fusion necessitate cesarean sections more frequently. The degree of correction loss during pregnancy is lower in previous reports involving pedicle screw instrumentation than in previous reports involving Harrington or hybrid segmental instrumentation.

Pregnancy and childbirth after adolescent idiopathic scoliosis surgery: A study of 80 pregnancies

BACKGROUND

Adolescent idiopathic scoliosis (AIS) is a common spinal disease affecting 2% of adolescents, and women in 90% of the cases. When a surgical treatment is opted for, many questions are frequently asked by families and patients about the course of pregnancy and childbirth after the spinal fusion. This subject remains little studied in the literature, especially with modern instrumentation techniques.

HYPOTHESIS

The goal was to describe pregnancy and childbirth after AIS surgery in terms of access to epidural analgesia, need for cesarean section (c-section), and low back pain during and after pregnancy. We thus hypothesized that women undergoing spinal surgery for AIS have subsequently uncomplicated pregnancies and childbirths, and have access to epidural analgesia as women without AIS do.

PATIENTS AND METHODS

In this retrospective multicenter study, 198 women who underwent surgery between 1984 and 2014 were reviewed from two university hospitals. Among them, 50 women became pregnant, for a total of 80 pregnancies. Surgical data were collected [approach, uppermost and lowermost instrumented vertebra (UIV, LIV)]. Pregnancy characteristics were evaluated: time between surgery and pregnancy, number of births, mode of analgesia, type of delivery, weight gain. Occurrence of low back pain during pregnancy and at follow-up was recorded using ODI.

RESULTS

Of the 50 women, 34 had posterior surgery and 16 had anterior surgery. Deliveries took place from 1988 to 2018. Of the 80 pregnancies, 81% were delivered by vaginal route (n=65/80), and an effective epidural anesthesia was performed for 49% of them (n=39/80). Epidural analgesia failed in 9% of pregnancies (n=7/80), and was denied in 35% of cases (n=28/80), half of the time by anesthesiologists (n=15/80). Patients refused epidural in 13 pregnancies (16%, n=13/80). A general anesthesia was used in six pregnancies (8%, n=6/80), for c-sections only. Back pain was reported in 48% of the pregnancies (n=38/80). The level of fusion was correlated with c-section, and conversely with epidural anesthesia.

DISCUSSION

A normal pregnancy with vaginal delivery seems to be the rule for women undergoing spinal fusion for AIS. The c-section rate in AIS women was similar to the general population (19%). Yet, access to epidural anesthesia still seems problematic with only 49% of births in this series, compared with 81% in the French population.

LEVEL OF EVIDENCE

IV, retrospective cohort.

The impact of pregnancy on women with adolescent idiopathic scoliosis: a scoping review

INTRODUCTION

Adolescent idiopathic scoliosis is the most common spinal deformity encountered in adolescents and larger curves are more prevalent in girls. For females with scoliosis, women's health issues are of particular concern, especially pregnancy. The aim of this review was to summarise the best available evidence to determine the influence of pregnancy on scoliosis-related outcomes in women with scoliosis and whether scoliosis affects maternal-health outcomes, differentiating between patients who have been managed conservatively and/or surgically.

EVIDENCE ACQUISITION

A search was conducted using CINAHL, Scopus, Cochrane Database, MEDLINE, and EMBASE from inception to May 2023 to identify relevant articles in any language. The scoping review followed the PRISMA-ScR guidelines. Studies were eligible if they included pregnant women (primiparous or multiparous) with a diagnosis of scoliosis of unknown aetiology. The results were summarized by outcomes, including pregnancy and scoliosis-related outcomes and type of management.

EVIDENCE SYNTHESIS

Our comprehensive search strategy identified 6872 articles, of which 50 articles were eligible for this review. Back pain appears to be more prevalent in this population during pregnancy and associated with the major curve and the decrease of lumbar lordosis. There have been reports of failed attempted spinal anaesthesia among patients with instrumented scoliosis correction and minor complications related to epidural anaesthesia at a higher rate compared to non-instrumented patients and healthy controls, however successful spinal analgesia can be achieved in patients with instrumented scoliosis correction. Overall, the caesarean section rate was similar in scoliosis patients compared to controls without scoliosis and to national averages. Curve progression occurs in some but not all patients during pregnancy, and this phenomenon occurs irrespective of the treatment received.

CONCLUSIONS

Higher-quality prospective longitudinal research is needed to understand the relationship between pregnancy and adolescent idiopathic scoliosis. Further, the patient's perspective, concerns and fears surrounding pregnancy with scoliosis are yet to be explored. Exploring the impact of pregnancy on women with adolescent idiopathic scoliosis would have clinically relevant outcomes and could help provide pertinent answers to patients and healthcare workers and help guide future research.

First Report of Spinal Anesthesia for Cesarean Delivery in a Parturient With Jeune Syndrome: A Case Report

Jeune syndrome, also known as asphyxiating thoracic dystrophy, is a rare form of autosomal recessive skeletal dysplasia. Respiratory distress due to thoracic and lung dysplasia is the primary complication associated with this disorder in neonates. Women with Jeune syndrome seldom conceive and give birth, as only a few survive until adulthood. Herein, we report the world's first case of a cesarean delivery under spinal anesthesia in a pregnant woman with Jeune syndrome with a history of chest wall reconstruction and spinal fusion surgeries.

Pragmatic approach to neuraxial anesthesia in obstetric patients with disorders of the vertebral column, spinal cord and neuromuscular system

Neuraxial anesthesia provides optimal labor analgesia and cesarean delivery anesthesia. Obstetric patients with disorders of the vertebral column, spinal cord and neuromuscular system present unique challenges to the anesthesiologist. Potential concerns include mechanical interference, patient injury and the need for imaging. Unfortunately, the existing literature regarding neuraxial anesthesia in these patients is largely limited to case series and rare retrospective studies. The lack of practice guidance may lead to unwarranted fear of patient harm and subsequent avoidance of neuraxial anesthesia for cesarean delivery or neuraxial analgesia for labor, with additional risks of exposure to general anesthesia. In this narrative review, we use available evidence to recommend a framework when considering neuraxial anesthesia for an obstetrical patient with neuraxial pathology.

Thoracolumbar curve and Cobb angle in determining spread of spinal anesthesia in Scoliosis. An observational prospective pilot study

Background and Aims

Disparity in spread of spinal anesthesia is a known complication in scoliosis patients. Our primary aim was to compare this disparity based on Cobb Angle and thorocolumbar spine curvature. Secondary aim was to calculate the appropriate lateral angulation of the spinal needle from midline for successful lumbar puncture.

Materials and Methods

All poliomyelitis patients with scoliosis posted for lower limb orthopedic contracture release surgeries were enrolled into Group A (Cobb Angle <50°), Group B (Cobb Angle >50°), and on thoracolumbar curve into Group R (Right), Group L (Left). Group A, B, R, and L were studied for bilateral spread of spinal anaesthesia. Lateral angle of the spinal needle from midline was noted with Goniometer in groups A and B. Statistical analysis was done using unpaired t test and Chi-square test.

Results

Failures in subarachnoid block (SAB) (unilateral anaesthesia/inadequate/patchy block) was significant in Group B (P = 0.033). Segmental disparity in bilateral spread of spinal anaesthesia was significant in Group R with P value of 0.042. Approximate lateral angle for needle in Group A was (4.1 ± 2.45) and in Group B was (9.14 ± 2.45).

Conclusions

The study showed that there was a strong correlation between right-sided thoracolumbar curve and the spread of spinal anesthesia.

Adolescent idiopathic scoliosis for the primary care physician: frequently asked questions

PURPOSE OF REVIEW

Provide primary care physicians with the best available evidence to support answers to frequently asked questions by caregivers of patients with adolescent idiopathic scoliosis (AIS).

RECENT FINDINGS

A review of best available evidence shows that schoolbag design and weight are not associated with higher odds of developing AIS. However, patients with AIS are more prone to balance problems with asymmetric backpack carrying and with rising weights. In patients with AIS, the backpack should be worn in a symmetric way and should never exceed 10% of the child's body weight. Although no relationship was found between systematic exercising in general and development of AIS, classical ballet and professional swimming in skeletally immature adolescents were associated to higher odds of having AIS. Since AIS affects adolescent girls mainly, women health issues are of paramount importance in this disease. Except for limited sexual activity and higher need for infertility treatment, patients with AIS perform similar to controls in marriage rates, age at first pregnancy, gestational age, offspring, labor and delivery. Best available evidence shows that adults with AIS diagnosed during adolescence have similar physical activity level compared with controls. In patients with AIS, adults with surgically treated idiopathic scoliosis have slightly lower physical activity level than previously braced and untreated patients.

SUMMARY

Although schoolbag weight isn't associated with higher odds of developing AIS, classical ballet and professional swimming in adolescents are. Except for limited sexual activity, patients with AIS perform similar to controls in remaining women health issues. Adults with AIS diagnosed during adolescence have similar physical activity level compared with controls.

Anaesthetic management for caesarean section of a parturient with a known difficult airway and closed spinal dysraphism

Many anaesthetists consider patients with existing neurological deficits, untreated spinal pathology or those having undergone major spinal intervention to be precluded from undergoing neuraxial anaesthesia. While this is partly rooted in fears of litigation there is also a lack of consensus of the best practice in the anaesthetic management of these patients. We present our management of a parturient who attended our institution, having a number of anaesthetic complexities including a known difficult airway, spinal fusion and persistent spinal cord tethering. She successfully underwent delivery under neuraxial blockade for the delivery of her fourth child. We believe that by undergoing a thorough multidisciplinary clinical evaluation, including the extensive use of neuroimaging and ultrasound, it may be possible to plan and perform safe neuraxial anaesthesia.

The impact of curve severity on obstetric complications and regional anesthesia utilization in pregnant patients with adolescent idiopathic scoliosis: a preliminary analysis

OBJECTIVE

Adolescent idiopathic scoliosis (AIS), the most common type of scoliosis, often presents immediately prior to a woman’s childbearing years; however, research investigating the impact of AIS on women’s health, particularly pregnancy delivery outcomes, is sparse, with existing literature reporting mixed findings. Similarly limited are studies examining the change in scoliotic curve during or after pregnancy. Therefore, this study aims to determine 1) the impact of scoliotic curvature on obstetric complications (preterm births, induction of labor, and urgent/emergency caesarean section delivery), 2) regional anesthetic decision making and success during delivery for these patients, and 3) the effect of pregnancy on curve progression.

METHODS

Records of all pregnant patients diagnosed with AIS at the authors’ institution who delivered between January 2002 and September 2016 were retrospectively reviewed. Demographic information, pre- and postpartum radiographic Cobb angles, and clinical data for each pregnancy and delivery were recorded and analyzed. The Wilcoxon rank-sum test and the Wilcoxon signed-rank test were used for statistical analyses.

RESULTS

Fifty-nine patients (84 deliveries) were included; 14 patients had undergone prior posterior spinal fusion. The median age at AIS diagnosis was 15.2 years, and the median age at delivery was 21.8 years. Overall, the median major Cobb angle prior to the first pregnancy was 25° (IQR 15°–40°). Most births were by spontaneous vaginal delivery (n = 45; 54%); elective caesarean section was performed in 17 deliveries (20%). Obstetric complications included preterm birth (n = 18; 21.4%), induction of labor (n = 20; 23.8%), and urgent/emergency caesarean section (n = 12; 14.0%); none were associated with severity of scoliosis curve or prior spinal fusion. Attempts at spinal anesthesia were successful 99% of the time (70/71 deliveries), even among the patients who had undergone prior spinal fusion (n = 13). There were only 3 instances of provider refusal to administer spinal anesthesia. In the subset of 11 patients who underwent postpartum scoliosis radiography, there was no statistically significant change in curve magnitude either during or immediately after pregnancy.

CONCLUSIONS

The results of this study suggest that there was no effect of the severity of scoliosis on delivery complications or regional anesthetic decision making in pregnant patients with AIS. Moreover, scoliosis was not observed to progress significantly during or immediately after pregnancy. Larger prospective studies are needed to further investigate these outcomes, the findings of which can guide the prenatal education and counseling of pregnant patients with AIS.

Ultrasound-guided continuous spinal anesthesia for cesarean section in a parturient with scoliosis corrected with Harrington's rod surgery

With rapid improvement in healthcare in Saudi Arabia, increasing number of women with surgically corrected kyphoscoliosis are likely to present for cesarean section (CS) or vaginal delivery requiring anesthesia or analgesia. Despite the surgical correction, these patients have poor cardiopulmonary reserves which increase the risks associated with general anesthesia. Whereas altered vertebral anatomy from previous surgery and the presence of metal work in spine make performing of regional anesthesia (RA) difficult and unpredictable, we report anesthetic management of such a patient who underwent CS using continuous spinal anesthesia technique. Challenges of placement of a spinal catheter in such a patient are discussed, and use of ultrasonography to circumnavigate these challenges is described. We propose that ultrasound can prove extremely valuable in performing of RA in patients with surgically corrected kyphoscoliosis. We could not find a similar case report from Saudi Arabia in the published literature.

Spinal anaesthesia in poliomyelitis patients with scoliotic spine: A case control study

Background:

There is limited data to predict the course of sub-arachnoid block in poliomyelitis patients with scoliotic spine. So we intended to study the course of intrathecal anaesthesia in these patients in comparison to patients with normal spine using 0.5% bupivacaine (heavy).

Methods:

In this prospective observational study, 41 poliomyelitic patients scheduled for lower limb corrective surgeries under spinal anaesthesia were enrolled. Patients were studied in two groups (Scolotic spine, n=20; Normal spine, n=21). All patients were injected 2 ml of 0.5% bupivacaine heavy intrathecally in the sitting position. The extent of block, bilateral spread, regression of sensory block and motor block were recorded. Demographic data were analysed using the unpaired t test or the chi square test as applicable. Block characteristics were analysed using the Mann Whitney U test.

Results:

There was statistically significant difference in bilateral spread of sensory block in between the groups. However, there was no significant difference in the maximum extent of the sensory block and the time taken for two segment regression of sensory block. There was no significant difference in time taken to reach complete motor block and for complete recovery from motor block to its preoperative value.

Conclusions:

Bilateral symmetrical spread of local anaesthetics through intrathecal route cannot be predicted accurately in patients with scoliotic spine. Spinal anaesthesia can be safely administered in poliomyelitis patients with scoliosis with less adverse effects.

Neuraxial techniques in patients with pre-existing back impairment or prior spine interventions: a topical review with special reference to obstetrics

Many anaesthetists consider neurological disorders of all kinds as a contraindication for regional anaesthesia particularly for neuraxial techniques. This hesitation is partly rooted in fears of medicolegal problems but also in the heterogeneous literature. Therefore, the present topical review is an attempt to describe the feasibility and the risks of neuraxial techniques in patients with spinal injury, anatomical compromise, chronic back pain or previous spinal interventions, ranging from 'minor' types like epidural blood patches to major surgery such as Harrington fusions. Most reviews and case reports were describing experiences in obstetrics as these patients are more likely to insist on neuraxial blocks. In the acute phase of new neurologic injury, general anaesthesia may be the technique of choice to prevent further haemodynamic and respiratory deterioration. After the acute phase, current evidence is mostly reassuring with respect to the risks of neuraxial blocks as they may even be recommendable in some conditions. Ultrasound technology may be of additional help to increase the success rate. A careful pre-operative examination remains mandatory, while patients should be sufficiently informed about technical aspects and possible relapses or progression of their disease. When necessary, patients should have additional technical and clinical examinations as close as possible to surgery to establish the actual pre-operative status. Most patients may benefit more from spinal techniques rather than from less reliable epidural ones. High concentrations and volumes of local anaesthetics should be avoided at all times, especially in patients with nerve compression, large disc herniation or spinal stenosis.

Peripartum anesthetic management of a patient with brittle cornea syndrome

Brittle cornea syndrome (BCS) is a rare autosomal recessive disease that affects the connective tissue. The syndrome is caused by genetic changes in the 4.7-Mb interval between the D16S3423 and D16S3425 markers on the 16q24 chromosome and mutations in the Zinc-Finger 469 gene (ZNF469). BCS is characterized by thin and fragile cornea that tends to perforate spontaneously or as a result of minor trauma to the eye. In addition, the patient usually suffers from hearing loss, mental retardation, hyperextensibility of skin and joints, as well as varying degrees of scoliosis. This phenotypical expression presents an interesting challenge to anesthetic care. We briefly present the perioperative management of a patient with BCS who underwent three cesarean sections.

The preoperative assessment of obstetric patients

The importance of early identification and management of the high-risk obstetric patient is emphasised in the Confidential Enquiry into Maternal and Child Health (CEMACH) report. High-risk patients who need anaesthetic input include those with airway problems, cardiorespiratory disease and rare genetic conditions, such as malignant hyperthermia and suxamethonium apnoea. Anaesthetic options for labour analgesia as well as anaesthesia for operative delivery will need to be discussed in detail with the patient if a delivery management plan is to be constructed. Input from other medical teams, such as cardiologists or haematologists, are often needed. Ultimately, these measures should reduce maternal morbidity and mortality.

Anaesthetic considerations for patients with a pre-existing neurological deficit: are neuraxial techniques safe?

Pre-existing neurological and muscular disease may be a specific concern for anaesthetists as they need to consider the effect of anaesthesia upon the disease, vice versa, and the interaction of anaesthesia with the medication taken by the patient. Despite a lack of controlled studies, many anaesthetists, being afraid of a claim, will prefer general rather than regional anaesthesia in these patients. Nevertheless regional anaesthesia certainly merits its place because it offers undeniable advantages. A good pre-operative examination is very important while patients should also be informed about peri-operative implications of anaesthesia, surgery and stress. Paraesthesias, epinephrine and high concentrations of local anaesthetics should be avoided in the majority of the diseases. Some diseases may benefit from epidural anaesthesia while for others a spinal technique may be the technique of preference. Special attention should be paid to patients with spinal stenosis despite recent reassuring reports with respect to safety of regional anaesthetic techniques. Anaesthetists should not automatically take all responsibility in case of progressive or new deficit after the procedure.

Anaesthesia for caesarean section in a patient with diastrophic dwarfism

Diastrophic dwarfism is a rare disease in which pregnancy is uncommon. In this report we present a woman with diastrophic dwarfism who underwent caesarean section under epidural anaesthesia. Her care was successfully managed with multidisciplinary team planning. The total dose of local anaesthetic needed for epidural block was greater than the doses reported for achondroplastic dwarfism.

Anaesthesia for caesarean section in spinal muscular atrophy type III

We describe the conduct of general anaesthesia for a patient with spinal muscular atrophy Type III (Kugelberg-Welander disease) undergoing elective caesarean section. Apart from a delayed return of skeletal muscle power following non-depolarising neuromuscular blockade the procedure was uneventful. We found no previously published reports of general anaesthesia for caesarean section in this condition in the English language literature. We review the available literature and discuss the potential anaesthetic problems in the management of obstetric patients with this degenerative neuromuscular disorder.