Anesthetic management of an anemic parturient with severe kyphoscoliosis and bilateral poliomyelitis for emergency caesarean section.
CASE HISTORY: A 148 centimeter, 40 kilogram, 20 years old unbooked primigravida with severe kyphoscoliosis and bilateral poliomyelitis since childhood presented in labor at 37 weeks of pregnancy. She was posted for emergency caesarean section in view of cephalopelvic disproportion in labor. No history of effort intolerance throughout childhood or pregnancy. On examination, she was conscious and oriented with severe pallor. Bilateral fixed flexion deformity of the lower limbs was present. Pulse rate 98/min, Blood Pressure 140/86 mm Hg, Respiratory rate (RR) 18/min, temperature 38 degrees celsius, SpO2 99% on room air.
Airway assessment revealed Mallampatti grade II with full range of neck movements. On systemic examination, thorax was asymmetric with severe dorsolumbar kyphoscoliosis at the level of T7 to L4 spine and Intervertebral spaces were palpable in the loin. Cervical spine was normal, Chest was clear with decreased breath sounds over the right infrascapular area. Breath holding time was 15 seconds. Cardiovascular system was normal. Her investigations were hemoglobin 4.5g/dl, total leukocyte count, bleeding time, clotting time, platelets, renal profile, arterial blood gas analysis (ABG) and electrocardiography (ECG) were within normal limits.
Central nervous system examination revealed muscle power of 3/5 in the lower limbs. Preoperative pulmonary function tests, 2D echo, chest X-ray were not done in view of emergency. As the patient was severely anemic with severe kyphoscoliosis and in labor, GA was considered for emergency caesarean section. The various anesthetic options were discussed with the patient and an informed consent was taken to administer GA under ASA III.
Two 18G cannula were secured, continuous monitoring of ECG, non-invasive blood pressure, pulse oximetry, end tidal carbon dioxide were done. Difficult airway cart was ready. Preoxygenation was done with 100% oxygen (O2) for 3 minutes, premedicated with injection glycopyrrolate 0.004mg/kg intravenous (IV), injection ranitidine 1mg/kg, injection metoclopramide 0.15mg/kg IV.
Rapid sequence induction was done with injection thiopentone sodium 5mg/kg IV and injection rocuronium 0.8mg/kg IV. Intubation response was attenuated with injection xylocard 1.5mg/kg IV. Endotracheal intubation was done with 6.5mm cuffed tube and airway secured. Anesthesia was maintained with O2 6 litres/minute, isoflurane 0.2-0.4%.
Induction delivery time was 8 minutes. A 2.5 kg male child with APGAR score 7 at 1minute and 9 at 3 minutes was delivered. After delivery of the baby oxytocin 20 units, Injection midazolam 1mg and injection fentanyl 40[micro]g IV were given. Intraoperatively, vitals were stable. Two units of packed red cells were transfused. The patient was electively ventilated post operatively for 2hours, extubated according to standard criteria.
Urine output was 1ml/kg/hour. Postoperative analgesia was provided with IV fentanyl infusion at the rate of 12.5[micro]g/hour for the first 4 hrs. followed by injection diclofenac sodium 75mg intramuscularly twice daily. Postoperative ABG before and after extubation were normal, haemoglobin was 7g/dl. X -ray chest, CT scan and 2D echo were done on first postoperative day to assess the severity of kyphoscoliosis. Chest physiotherapy and deep breathing exercises were given. Her vitals were stable throughout the postoperative period and she was discharged on the tenth day.
DISCUSSION: An important focus in obstetric surgery is the safe and skilled anaesthetic management to minimize risk to the mother and the fetus. For an emergency caesarean section in a patient with severe kyphoscoliosis who has severe anaemia with a full stomach the choice of anaesthesia is important. The physiological changes in pregnancy can worsen the respiratory function in a scoliotic patient with restrictive lung disorder.
Poliomyelitis is associated with scoliosis in 30% of patients when compared to its prevalence in general population which is 0.3-15.3%. (4) Kyphoscoliosis is graded by measuring Cobb's angle and classified as mild (11-25 degrees), moderate (25-50degrees), or severe (>50 degrees). (5) The Cobb's angle can be correlated with the pulmonary function tests where Cobb's angle above 60 degrees is associated with progressive pulmonary and cardiac failure. (6) Pregnancy may further exacerbate both the severity of spinal curvature and cardiorespiratory abnormalities in patients with uncorrected scoliosis. (7) In our case, though the Cobb's angle was 72 degrees she did not have any symptoms of decreased cardiorespiratory reserve and could tolerate pregnancy.
During pregnancy, increased minute volume is by increase in tidal volume rather than RR. In midgestation, diaphragmatic activity is restricted as the enlarging uterus enters the abdominal cavity thus decreasing functional residual capacity (FRC) and closing capacity (CC). In kyphoscoliosis with restrictive pattern, rise in tidal volume is not possible and the increased minute volume is achieved by increased RR resulting in increased work of breathing and oxygen consumption- Decrease in FRC and CC more than the anticipated values result in ventilation perfusion mismatch and reduced arterial oxygen content. In our case with severe anemia the oxygen supply was expected to be less.
The anesthetic goal was directed towards minimizing factors interfering with 02 delivery, prevent any increase in 02 consumption and to optimize the partial pressure of 02 in the arterial blood by avoiding hypoxia, minimising drug induced decrease in cardiac output by preventing bradycardia and hypotension.
Monitoring should be aimed at assessing the adequacy of perfusion and oxygenation of vital organs which includes monitors like ECG, non-invasive blood pressure, end tidal carbon dioxide, temperature, pulse oximetry, urine output and ABG analysis.
Preoperative blood transfusion was not possible as it was an emergency, but we gathered adequate units of packed red cells before induction. Hypothermia was avoided by infusing warm intravenous fluids and blood. Aspiration prophylaxis was given, rapid sequence induction was done. In view of polio, succinylcholine was avoided to prevent hyperkalemia. (8)
The different choices regarding the type of anaesthesia were General anaesthesia, spinal, continuous spinal, epidural or combined spinal epidural. Central neuraxial blocks are advantageous in providing good analgesia, ability to provide supplemental 02 and reduced blood loss. However, pitfalls with central neuraxial blocks include dangers of hypotension, subsequent heart failure or pulmonary oedema on the return of vascular tone (9), unsuccessful or multiple attempts for insertion, false loss of resistance, dural puncture, failed block or inadequate analgesia. (10)
In severe kyphoscoliosis, there is decreased volume of cerebrospinal fluid and even lower volumes of local anaesthetic drug can produce higher level than expected. (11) Systemic hypotension consequent to a regional block could have worsened the existent maternal decompensation.
GA was administered in this patient to avoid technical difficulty with regional, maternal decompensation associated with severe anaemia and due to emergency surgery, but disadvantages with GA like increase in pulmonary artery pressure leading to right heart failure, decrease in venous return and cardiac output with positive pressure ventilation were minimised. Postoperatively anticipating delayed recovery patient was ventilated for 2 hours.
CONCLUSION: Pregnancy along with kyphoscoliosis presents a unique challenge to the anesthesiologist which worsens when associated with severe anaemia, GA is preferable as it provides airway control and adequate oxygenation. Regional anaesthesia is widely practised but has limitations due to technical difficulty. In our case, anatomic deformity was much severe than physiologic abnormality.
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Sujay Mysore , Laxmi Priyanka Karri , Merajuddin S , Venugopalan V. M , Raghunath Ravirala 
[1.] Sujay Mysore
[2.] Laxmi Priyanka Karri
[3.] Merajuddin S.
[4.] Venugopalan V. M.
[5.] Raghunath Ravirala
PARTICULARS OF CONTRIBUTORS:
[1.] Assistant Professor, Department of Anaesthesiology, Kamineni Institute of Medical Sciences, Narketpally.
[2.] Post Graduate, Department of Anaesthesiology, Kamineni Institute of Medical Sciences, Narketpally.
[3.] Post Graduate, Department of Anaesthesiology, Kamineni Institute of Medical Sciences, Narketpally.
[4.] Professor, Department of Anaesthesiology, Kamineni Institute of Medical Sciences, Narketpally.
[5.] Post Graduate, Department of Anaesthesiology, Kamineni Institute of Medical Sciences, Narketpally.
NAME ADDRESS EMAIL ID OF THE CORRESPONDING AUTHOR:
Dr. Sujay M, #1-14-158, Balamrai, 68, Sappers Lines, Secunderabad--500003.
Date of Submission: 25/04/2014.
Date of Peer Review: 26/04/2014.
Date of Acceptance: 30/04/2014.
Date of Publishing: 15/05/2014.
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|Title Annotation:||CASE REPORT|
|Author:||Mysore, Sujay; Karri, Laxmi Priyanka; Merajuddin, S.; Venugopalan, V.M.; Ravirala, Raghunath|
|Publication:||Journal of Evolution of Medical and Dental Sciences|
|Date:||May 19, 2014|
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