A randomized controlled comparison of non-channeled king vision, McGrath MAC video laryngoscope and Macintosh direct laryngoscope for nasotracheal intubation in patients with predicted difficult intubations

Table 2 Intubation profiles

	King Vision n = 33	McGrath n = 33	Macintosh n = 33	p value
Intubation time (sec) ¹	37.6 (7.3) ***	35.4 (8.8) ***	46.8 (10.4)	< 0.0001
First success of intubation (%)	33 (100%) *	33 (100%) *	28 (85%)	0.0017
Laryngoscopy time (sec) ¹	16.7 (5.5) *	15.6 (6.3) *	22.8 (7.2)	0.0002
C-L grade I/II/III/IV	29/4/0/0 ***	27/6/0/0 ***	6/10/12/5	< 0.0001
C-L grade I and II (%)	33 (100%) ***	33 (100%) ***	16 (48%)	0.0004
Assist maneuvers (%) ¹	5 (15%) ***	4 (12%) ***	18 (64%)	< 0.0001
Difference between MAP_maximum and MAP _{post-induction} (mmHg) ¹	47.7 (12.5)*	45.1 (10.3)**	54.9 (10.2)	0.0030

Data presented as mean (SD) or number (percentage). C-L: Cormack and Lehane. MAP: mean arterial pressure. NS: not significant. Assist maneuvers: use of the BURP maneuver, Magill’s forceps or cuff inflation. ¹: n = 28 in Macintosh group. *p < 0.05; **p < 0.01; ***p < 0.001 compared with Macintosh group

ISSN: 1471-2253