ABSTRACT
Background and Aim: Spinal anaesthesia-induced hypotension (SAIH) is a frequent side effect of spinal anaesthesia. SAIH is usually observed in patients with hypovolemia. Ultrasonography has evolved as a non-invasive tool for volume status assessment. Methods: This prospective, blinded, observational study was conducted on 75 adult patients who required spinal anaesthesia after receiving ethical approval and registering the study. Ultrasonographic evaluation of the aorta and the inferior vena cava (IVC) was done preoperatively, and the IVC collapsibility index (IVCCI) and caval aorta index were calculated. The incidence of SAIH was recorded. The strength of the association between different parameters and SAIH was calculated. To find out the value of the optimal cut-off for the prediction of SAIH, receiver operating characteristic (ROC) analysis for various ultrasound parameters was done. The bidirectional stepwise selection was utilised for multivariate analysis to choose the single best predictor. Results: SAIH was observed in 36 patients. Among demographic parameters, age, female gender, and height showed a medium correlation. Among ultrasonographic measurements, minimum IVC internal diameter (IVCmin) and IVCCI showed a strong association with SAIH. The best parameter regarding area under the ROC curve (AUC) and diagnostic accuracy was IVCCI (0.828 and 85%, respectively). On multivariate analysis, age (95% CI [1.01, 1.12], P = 0.024) and IVCCI (95% CI [1.05, 1.18], P < 0.001) were significant independent predictors. At a cut-off point of ≥43.5%, IVCCI accurately predicted SAIH (sensitivity 81% and specificity 90%). Conclusion: Preoperative ultrasonographic assessment of IVC to evaluate its collapsibility index is a convenient, cost-effective, and reproducible tool for predicting SAIH.
ABSTRACT
Background and Aims: The perfusion index (PI) has been used as a marker of peripheral perfusion. A lower PI indicates greater peripheral vascular tone and increased risk of hypotension following spinal anesthesia. The present study was conducted to evaluate and correlate perfusion index (PI) with incidence of hypotension following spinal anesthesia for caesarean section. Material and Methods: The present prospective, double blind, observational study included sixty full term parturients in the age group 18-35 years belonging to American Society of Anesthesiologists (ASA) physical status I and II, having singleton pregnancy undergoing caesarean section under spinal anesthesia. On the basis of baseline PI, patients were allocated into one of the two groups: Group I (n = 30) Patients with baseline PI ≤.3.5 and Group II (n = 30) Patients with PI >3.5. Results: The incidence of hypotension in group I was 40% as compared to 73.3% in group II (p = 0.009). Thus, the incidence of hypotension in group II with baseline PI >.3.5 was more as compared to group I. Patients in group II with baseline PI >.3.5 had significantly more episodes of hypotension as compared to those in group I with baseline PI ≤3.5. Conclusion: PI can be used as a useful tool for predicting hypotension in parturients undergoing elective caesarean section under spinal anesthesia in everyday practice.
ABSTRACT
Laryngeal mirror (LM) is an inexpensive, portable, readily available device which can help visualize the vocal cords in difficult airway (DA) situations. We evaluated its use in improving glottic view prior to placing the airway adjuncts in simulated difficult airway.Eighty patients scheduled to undergo elective surgery under general anaesthesia with endotracheal intubation were allocated- Bougie group (Group B) and Stylet group (Group S). Direct laryngoscopy was performed and CL grade III simulated. The glottic view was obtained using laryngeal mirror and Gum Elastic Bougie (GEB)/ Styleted Endotracheal Tube (ETT) inserted under mirror view. Time taken to obtain glottic view in LM and time for successful intubation were noted.Significant improvement in glottic view with LM was observed, with the view improving to Grade I in 76.25% and grade II in 23.75% of patients. Both groups were comparable with respect to number of attempts and success rate (p = 0.55).The success rate was 90% in group B and 95% in group S. Time taken for intubation was less in Group S (52.44 ± 14.23 s vs. 62.805 ± 20.74 s) [p = 0.01]. Hence, overall stylet proved to be a better adjunct with mirror guided intubation.We recommend stylet assisted rather than GEB assisted ET intubation under LM guidance in emergency scenarios. Also, further controlled trials are recommended to know the exact location of the mirror in relation to bulb of the laryngoscope as well as different angles at which it is placed to improve the view and stabilize the assembly.
