Effectiveness of C-MAC video-stylet versus C-MAC D-blade video-laryngoscope for tracheal intubation in patients with predicted difficult airway: Randomized comparative study

Figures & data

Figure 1. Flow chart of the study.

Table 1. Characteristics of the participants in both groups.

Personal data	VS Group “n=80”		D Group “n=80”		P-value
Age in years Range Mean ± SD	19–64 44.7±12.7		19–64 41.8±12.5		0.1 N.S.
Sex Male Female	No	%	No	%	0.3 N.S.
	40 40	50 50	36 44	45 55
BMI Range Mean ± SD	17–43 27.6±6.8		18–43 28.4±6.6		0.2 N.S.

Data were expressed in terms of mean ±SD, range and percentage.

N.S.: not significant.

Table 2. Intubation conditions in both groups.

	VS Group “n=80”		D Group “n=80”		P-value
Number of intubation attempts	No	%	No	%	0.2
One attempt	68	85.0	61	76.3
Two attempts	11	13.8	14	17.5
Three attempts	1	1.3	5	6.2
Assisting device needed					0.001*
No	78	97.5	19	23.8
Stylet	0	0	54	67.5
Bougie	0	0	7	8.75
Oral airway	2	2.5	0	0
Technician assistance needed	10	12.0	29	36.3	0.001*

Data were expressed in terms of mean ±SD, range, and percentage.

*P-value significant at ≤0.05.

Figure 2. Intubation time in each difficulty cause in both studied groups.

Table 3. Intubation time in both groups in different causes of difficult airway.

Intubation time	VS Group “n=80”	D Group “n=80”	P-value
Intubation time for all the patients in sec.			0.021*
Range	23–166	30–279
Mean ± SD	53.2±24.2	65.5±40.6
For Limited mouth opening			0.001*
Range	23.0–63.0	32.0–178.0
Mean± SD	38.6±12.2	73.3±43.5
For Obese			0.0023*
Range	32.0–98.0	34.0–279.0
Mean± SD	50.9±17.5	92.1±62.4
For Limited neck mobility			0.0139*
Range	34.0–145.0	32.0–89.0
Mean± SD	63.8±24.9	48.7±16.3
For Mallampati ≥III			0.2 N.S.
Range	38.0–166.0*	30.0–153.0
Mean± SD	62.4±30.4	61.4±30.1
For Other			0.1 N.S.
Range	23.0–67.0	34.0–71.0
Mean± SD	40.3±15.3	49.1±13.1

Values are presented as mean ± SD and range.

*Significantly different compared to other group (P ≤ 0.05).

Figure 3. Oxygen saturation in both groups.

Table 4. Multiple regression analysis of different risk factors in relation to intubation time.

Model	Un-standardized coefficients		Standardized coefficients	t	Sig.
	B	Std. Error	Beta
Constant	31.9	20.7		1.5	0.1
Device used	15.8	5.4	0.2	2.9	0.004*
Cause of difficulty	3.5	2.1	0.1*	1.7	0.1
Age	0.3	0.2	0.1	1.6	0.1
Sex	7.2	5.5	0.1	1.3	0.2
BMI	0.3	0.4	0.1	0.8	0.4

Dependent variable: intubation time.

F-test (ANOVA) was used.

*P-value significant at ≤0.05

Figure 4. Heart rate changes in both groups.

Figure 5. Mean Arterial Blood Pressure (MABP) changes in both groups.

Table 5. Complications assessment in both groups.

Complication	VS Group “n=80”		D Group “n=80”		P-value
	No	%	No	%
Dental trauma	2	2.5	3	3.8	0.6 N.S.
Hematoma	1	1.3	4	5	0.1N.S.
Sore throat	3	3.8	5	6.3	0.1N.S.