|Year : 2013 | Volume
| Issue : 2 | Page : 79-84
Ketamine/propofol (ketofol) versus propofol/fentanyl for induction of general anesthesia in parturients with rheumatic valvular lesions undergoing elective cesarean section
Nashwa Samy ELZayyat1, Amira Refae Hassan1, Ahmed Ibrahim ELSakka1, Ahmed Hussein Saad2
1 Department of Anesthesia and Intensive Care, Cairo University, Cairo, Egypt
2 Department of Obstetrics and Gynecology, Cairo University, Cairo, Egypt
|Date of Submission||17-Oct-2012|
|Date of Acceptance||29-Dec-2012|
|Date of Web Publication||31-Dec-2013|
Nashwa Samy ELZayyat
12 Ahmed Mokhtar Hegazy-Manial
Source of Support: None, Conflict of Interest: None
In this study, we assumed that the addition of ketamine to propofol (ketofol) would maintain cardiac stability in parturients with valvular heart without any deleterious effect on the fetus, that is no respiratory depression for the baby and hence a better Apgar score. This open-label randomized study was carried out in the High-risk Obstetric Unit, Cairo University Hospitals, in collaboration with the Anesthesia Department. The study included full-term parturients, 36-38 weeks' gestational age, 25-40 years old with severe rheumatic valvular heart lesions (mitral stenosis, mitral regurge, aortic stenosis, aortic regurge) of functional class II or III according to the New York Heart Association Classification. At the time of induction, patients were allocated randomly to one of the two study groups: group K (n = 25) received intravenous ketamine 1 mg/kg combined with propofol 1 mg/kg. Group P (n = 25) received propofol 2 mg/kg and fentanyl 2 mg/kg. Mean arterial blood pressure (MAP), heart rate (HR), and central venous pressure were recorded at the following times:T1, T2, T3, T4, T5, and T6. Decrease in MAP was only significant in group P (P < 0.001 at T2 and T3). The magnitude decreases in MAP. The absolute value of MAP was significantly lower in group P after induction, intubation, and skin incision. The median decrease in MAP was significantly higher in group P after induction and intubation. HR increased significantly after induction of anesthesia and after endotracheal intubation in the two groups. It reverted to near baseline values thereafter. The magnitude decreases in HR. The absolute value of HR was significantly lower in group P after intubation and skin incision. Apgar scoring was significantly better (higher) in the ketofol group at 1 and 5 min. We can conclude that a combination of ketamine and propofol seems to be an appropriate choice for anesthesia of critically ill rheumatic cardiac parturients undergoing cesarean section. It proved to be effective and hemodynamically safe for such a critical situation.
Keywords: apgar score, cardiac parturients, ketamine/propofol (ketofol),valvular lesions
|How to cite this article:|
ELZayyat NS, Hassan AR, ELSakka AI, Saad AH. Ketamine/propofol (ketofol) versus propofol/fentanyl for induction of general anesthesia in parturients with rheumatic valvular lesions undergoing elective cesarean section. Egypt J Cardiothorac Anesth 2013;7:79-84
|How to cite this URL:|
ELZayyat NS, Hassan AR, ELSakka AI, Saad AH. Ketamine/propofol (ketofol) versus propofol/fentanyl for induction of general anesthesia in parturients with rheumatic valvular lesions undergoing elective cesarean section. Egypt J Cardiothorac Anesth [serial online] 2013 [cited 2017 Jun 25];7:79-84. Available from: http://www.ejca.eg.net/text.asp?2013/7/2/79/124041
| Introduction|| |
Ketamine, which has been used as an induction agent during general anesthesia since the 1960s, has been shown to cause dissociative anesthesia and a potent analgesic effect. Although ketamine can maintain the muscle tones and airway reflexes, its use was limited because of its sympathomimetic effect, hallucination during emergence, nausea, and vomiting  .
Propofol is another induction agent that has been discovered since the 1970s. It has a rapid onset of action with antiemetic and anticonvulsive effects; however, it may cause severe myocardial depression and hypotension  .
Frizelle et al.  postulated that the use of both drugs as a combination in the same syringe was pharmaceutically accepted by the use of different concentrations of both drugs, and it was assumed that it exerts an additive effect with a decrease in the side effects of hypotension, and nausea and vomiting.
Mitral stenosis and aortic stenosis are considered the most common valvular heart lesions in parturients, especially in developing countries  . Valvular heart disease represents the leading etiology of cardiac disease during pregnancy in developing countries. A recent study from Egypt reported a frequency of 1.66/100 deliveries; two-thirds of cases were rheumatic in nature  . Patients with a tight valvular lesion have a fixed cardiac output and any decrease in the systemic vascular resistance caused by regional anesthesia is poorly tolerated in these patients, which makes general anesthesia a better alternative option  .
Anesthesia used for these patients usually depended on fentanyl as a narcotic analgesic combined with propofol as an induction agent; these drugs have been proved to maintain cardiac stability, but a decreased Apgar score for infants in the first and fifth minute with associated respiratory depression and hypnosis was observed  .
We assumed that the addition of ketamine to propofol (ketofol) would maintain cardiac stability in parturients with a valvular heart without any deleterious effect on the fetus, that is no respiratory depression for the baby and hence a better Apgar score.
| Patients and methods|| |
This open-label randomized study was carried out in the High-risk Obstetric Unit, Cairo University Hospitals, in collaboration with the Anesthesia Department. The study was approved by the Departmental Ethical and Research Committee and an informed written consent was obtained from all patients. The study was carried out in accordance with the provision of the world medical association Declaration of Helsinki. The study extended over the period from March 2010 to September 2011 (18 months).
The primary outcome measure was mean arterial blood pressure (MAP). The secondary outcome measures included other haemodynamics [heart rate (HR) and central venous pressure (CVP)], postoperative nausea and vomiting (PONV), and fetal outcome in terms of the Apgar score.
The study included full-term parturients, 36-38 weeks' gestational age, 25-40 years old with severe rheumatic valvular heart lesions (mitral stenosis, mitral regurge, aortic stenosis, aortic regurge) of functional class II or III according to the New York Heart Association Classification (NYHAC) [Table 1]. Fifty parturients fulfilled the inclusion criteria and were enrolled in the study.
|Table 1 New York Heart Association Functional Classification of heart disease |
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Patients who had undergone valvular replacement, valvotomy, commissurotomy, had severe pulmonary hypertension (mean pulmonary artery pressure>55 mmHg), pregnancy-induced hypertension, or other associated comorbidities such as diabetes or heart failure, and any fetal abnormalities or fetal distress were excluded.
The anesthesiologist interviewed, assessed, and examined patients preoperatively and explained the anesthetic intervention. The patients were allocated randomly to the two study groups using a computer-generated table. Prophylaxis against acid aspiration was provided in the form of 150 mg ranitidine intravenously on the night before and on the morning of the procedure.
| Preoperative|| |
On arrival to the operating room, all patients were monitored according to the basic American Society of Anesthesiologists standards. A peripheral intravenous line was secured. The radial artery and internal jugular vein were cannulated before induction of anesthesia using lidocaine infiltration. Fetal HR monitoring was performed by one of the surgeons from the time of entry to the theater till surgical site sterilization.
| Intraoperative|| |
All patients were preoxygenated by 100% oxygen using a face mask for 5 min. At the time of induction, patients were allocated randomly to one of the two study groups: group K (n = 25) received intravenous ketamine 1 mg/kg combined with propofol 1 mg/kg. Group P (n = 25) received propofol 2 mg/kg and fentanyl 1 μg/kg. Cricoid pressure was maintained after loss of eye lash reflex, endotracheal intubation was facilitated with the use of succinylcholine 1 mg/kg, and intubation was applied in rapid sequence induction. Sevoflurane at a mean alveolar concentration of 2% was used. Higher doses were avoided to prevent any uterine atony. Fractional inspired oxygen concentration (FiO2) of 1.0 was used throughout the operation. The lungs were ventilated using the volume-controlled mode of ventilation adjusted to maintain normocapnia. Normocapnia was monitored continuously to optimize the pulmonary vascular resistance and also to optimize the HR and avoid tachycardia. The patient's position was adjusted in the left uterine displacement by applying a wedge under the right flank. Oxytocin regimen: 5 mg diluted to 10 ml saline slowly intravenously as a bolus dose over 10 min then 10 U in 500 ml saline infusion over 30 min. Hypotension was treated using ephedrine boluses aiming to maintain the MAP within 10% of the preoperative values. At the end of the operation, the patients were extubated and monitored continuously for normocarbia and maintenance of blood pressure until they were transferred to the cardiac ICU unit.
MAP, HR, and CVP were recorded at the following times:
- T1: just before induction of anesthesia (baseline).
- T2: just after induction of anesthesia (injection of intravenous anesthetics and before intubation).
- T3: after endotracheal intubation.
- T4: at skin incision and before delivery of the baby.
- T5: after delivery of the baby.
- T6: after oxytocin bolus.
- T7: in the recovery room.
Apgar scores at 1 and 5 min were recorded to assess the neonatal outcome. A follow-up interview was conducted by the in-charge anesthesiologist 24 h after cesarean section and patients were asked about recall, quality of sleep, dreams, PONV.
Sample size and estimation
On the basis of an estimated difference of MAP after induction of anesthesia of 4 mmHg between ketofol and propofol with a common SD of 4.2 mmHg, a sample size of 24 cases in each group will be satisfactory and convenient for an α level of 0.05 and a power of the test of 90%  .
Categorical variables were assessed using the χ2 or the Fischer exact test when appropriate. Normally distributed data are presented as mean ± (SD) and were analyzed using Student's t-test and two-way analysis of variance with repeated measures and post-hoc Dunnett's test as appropriate. Data not normally distributed (tested by the Kolmogorov-Smornov test) are presented as median (range) and were analyzed using the Mann-Whitney U-test or the Kruskal-Wallis test as appropriate. The software SPSS v 15.0 for Windows (SPSS Inc., Chicago, Illinois, USA) was used for statistical analysis.
| Results|| |
Demographic data of both groups were comparable, with no statistically significant differences [Table 2].
Echocardiography performed before and after measurement of the ejection fraction values showed no statistically significant difference between groups and in the same group: (62 ± 9.5, 62 ± 9.7%) in group (K) compared with (61 ± 8.9, 63 ± 9.2%) in group P, respectively.
As shown in [Figure 1], MAP decreased after induction of anesthesia with a slight increase after endotracheal intubation in the two groups. The decrease in MAP was only significant in group P (P < 0.001 at T2 and T3). The magnitude of decrease in MAP is shown in [Table 2]. The absolute value of MAP was significantly lower in group P after induction, intubation, and skin incision [Figure 1]. The median decrease in MAP was significantly higher in group P after induction and intubation [Table 3].
|Table 3: Percentage change in mean arterial pressure and heart rate during surgery in the two groups studied|
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HR increased significantly after induction of anesthesia and after endotracheal intubation in the two groups. It reverted to near baseline values thereafter. The magnitude of decrease in HR change is shown in [Table 2]. The absolute value of HR was significantly lower in group P after intubation and skin incision [Figure 2]. The median change in HR was significantly different between the groups after intubation and skin incision [Table 2]. However, all changes were within the clinically accepted range. [Figure 3] shows changes in CVP during the operative time. There was no significant change in CVP in the two groups and no difference in CVP between the two groups.
Apgar scoring was significantly better (higher) in the ketofol group at 1 and 5 min [Table 4].
In terms of recall, hallucination, and PONV, no patient in either group experienced recall or hallucination and only one patient in the fentanyl propofol group experienced nausea and vomiting, treated with 10 mg metoclopramide intravenously.
| Discussion|| |
This study showed that a combination of ketamine and propofol (ketofol) is a safe and effective option for induction of anesthesia for cesarean section in parturients with severe cardiac disease. Ketofol produced a moderate clinically acceptable decrease in MAP (median value of 10%) in addition to a slight change in HR and CVP. Compared with propofol/fentanyl, it seems to be of comparable effectiveness and with a safer hemodynamic impact.
Anesthesia of cardiac patients undergoing cesarean section has always been a challenge for experienced anesthesiologists. A compromised cardiovascular system encounters an extra burden during pregnancy that increases late close to delivery. This is the situation during elective cesarean delivery, a compromised heart carrying an overload that will increase after delivery of the fetus secondary to relief of inferior vena cava obstruction and autotransfusion of about 500 ml from uterine contraction  .
Rheumatic heart diseases during pregnancy are not uncommon, especially in developing countries such as Egypt  . Carapetis et al.  reviewed the worldwide burden of these diseases; they estimated a prevalence of at least 15.6 million cases of rheumatic heart disease, with a yearly 282 000 new cases and 233 000 deaths. They calculated a 1.8/1000 regional prevalence in Middle East and North Africa. In the current study, we included cases with rheumatic valvular heart lesions of NYHAC functional class II or III.
Both general and spinal anesthesia can be used for elective cesarean section in cardiac parturients. Spinal anesthesia is simple, with rapid onset and dense block  . However, to prevent intraoperative visceral pain, a level of anesthesia including T5 is required , , which carries the risk of hypotension with a subsequent reduction of cerebral perfusion and unpleasant nausea and vomiting  . More severe and prolonged hypotension may cause loss of consciousness, with the risk of airway obstruction or aspiration and subsequent hypoxia. Inadequate uteroplacental perfusion may place the fetus at risk  .
Pathophysiologically, hemodynamic changes are a reflection of a marked decrease in systemic vascular resistance compensated by increased stroke volume and HR  . Hemodynamic stability under spinal anesthesia can be achieved by titrated regional anesthesia by intravenous volume, phenylephrine infusion, and small repeated doses of intravenous oxytocin  .
In patients with mitral stenosis, epidural anesthesia is a preferable choice because of slower onset of blockade, allowing controllable hemodynamic alterations. However, patients are also at risk of developing hypotension because of venous pooling. Prophylactic ephedrine and appropriate intravenous fluid administration are needed to maintain hemodynamic stability  .
During general anesthesia, hemodynamic stability can be achieved if sympathetic stimulation associated with intubation, suction, and extubation is minimized and by avoidance of induction with drugs that commonly produce tachycardia. Blunting of hemodynamic response to stimulating events may be accomplished by the use of opioids. Controlled emergence is necessary to avoid postoperative tachycardia and increase in blood pressure. We believe that the opposing hemodynamic and respiratory effects of ketamine and propofol are a tempting option that enhances the practicality of this combination to ensure safety and efficacy, with a consequent reduction of the required dose of propofol to induce adequate sedation. The results of this study proved this assumption, which is supported by other investigations that utilized ketofol in other critical situations.
Prospective studies investigated the effects of propofol-ketamine in pediatric patients undergoing cardiac catheterization. Low-dose ketamine combined with propofol led to better preservation of MAP compared with propofol alone , . This combination was also proved to be safe in pediatric patients undergoing auditory brainstem response testing; it prevented the risk of respiratory depression because of propofol  . It was also safe and effective in pediatric patients undergoing burn dressing changes  .
Another prospective, randomized trial included 90 adults to study the effects of ketamine addition to propofol on hemodynamic profile and laryngeal mask airway insertion conditions. Higher blood pressure was observed following the administration of ketamine compared with either fentanyl or saline. Ketamine was associated with less prolonged apnea than fentanyl  . Ketofol was tested in 114 procedural sedation and analgesia in emergency orthopedic procedures. It was found to be effective and safe for such painful procedures, with rapid recovery and satisfaction among both patients and staff  . Similar success of ketofol combination for procedural sedation and analgesia was reported in a prospective study of 219 pediatric patients. Few adverse events were observed  .
Ketofol provided effective sedation in children undergoing bone marrow aspiration with rapid recovery and insignificant complications  . Ketofol also produced deep sedation as an adjunct to regional analgesia for lower limb surgery  . Ketofol maintained hemodynamic stability in oncology procedures , .
| Conclusion|| |
The combination of ketamine and propofol seems to be an appropriate choice for anesthesia of critically ill rheumatic cardiac parturients undergoing cesarean section. It proved to be effective and hemodynamically safe for such a critical situation. Further larger randomized trials are required to confirm these findings.
| Acknowledgements|| |
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3]
[Table 1], [Table 2], [Table 3], [Table 4]