Role of perfusion index in early detection of hypotension following spinal anesthesia for cesarean section

Figures & data

Figure 1. Line graph describes mean changes that occurred in PI, MABP, and SBP starting from baseline to 60 minutes of cesarean section.

Figure 2. Correlation between change in PI and change in systolic blood pressure during spinal anesthesia for cesarean delivery.

Table 1. Correlations between changes that occurred in the systolic blood pressure and in perfusion index.

		Correlations
		Systolic BP	Perfusion index
Systolic BP	R	1	−.439*
	P		<.0001*
	No.		100

Note: R; Spearman correlation.

*Statistically significant.

Table 2. Univariate linear regression analysis to predict the effect of PI on SBP.

	Unstandardized coefficients		Standardized coefficients	t	p	95% Confidence interval
	B	Std. error	Beta
(Constant)	−10.646	.883	-	−12.057	<.0001*	(−12.39 to −8.89)
PI	−2.089	.419	−.450	−4.987	<.0001*	(−2.920 to −1.258)

Note: Dependent variable: SBP.

Figure 3. Diagnostic ability of PI in prediction of hypotension during cesarean section.

Table 3. Diagnostic ability of PI in prediction of hypotension during cesarean section.

NPV (95% CI)	PPV (95% CI)	Specificity (95% CI)	Sensitivity (95% CI)	Cutoff point	P value	AUC (95% CI)
86.1 (75.9–93.1)	100 (87.2–100)	98.7 (94.2–100)	73.7 (56.9–86.6)	>2.127	<.0001*	.92 (0.859–0.970)	PI

Table 4. Relations between the blood pressure variables and perfusion index following oxytocin bolus.

	Before oxytocin bolus (No. = 100)	After oxytocin bolus (No. = 100)	Test of significance (P)
SBP	103 (88–115)	105 (93–114)	(z = −1.9, P = .05*)
MABP	67.33 (59–78)	69 (65–75)	(z = −.86, P = .38)
PI	4.5 (2.8–12.4)	5 (2.9–11)	(z = −4.3, P < .0001*)

Note: Data described by median (Min-Max).

z; Wilcoxon test.

*Statistically significant.

Figure 4. Relations between perfusion indexes before ephedrine bolus vs. after ephedrine bolus.

Table 5. Relations between perfusion indexes before ephedrine bolus vs after ephedrine bolus.

	Before ephedrine bolus (No. = 83)	After ephedrine bolus (No. = 83)	Test of significance (P)
PI	10 (5.5–15)	7.5 (6–15.5)	(z = −6.6, P < .0001*)