Evaluation of respiratory muscle dysfunction in patients with idiopathic pulmonary fibrosis: a prospective observational study with magnetic resonance imaging

Table 4 Correlations between motion metrics and pulmonary function in IPF patients

		TLV (L)	6MWD(m)	FVC%	FEV1%	TLC%	DLco%
Chest Wall motional metrics
AAL	Left AP	0.347**	0.469**	0.434**	0.377**	0.386**	0.327**
	Right AP	0.355*	0.464*	0.454**	0.383**	0.371**	0.299*
	LR	0.334*	0.413*	0.278*	0.278*	0.267*	0.240*
	Area	0.466**	0.447**	0.458**	0.406**	0.329**	0.375**
TCL	Left AP	0.355**	0.353*	0.259*	0.309*	0.267*	0.240*
	Right AP	0.512**	0.305*	0.472**	0.425**	0.453**	0.367**
	LR	0.188	0.443*	0.227	0.161	0.206	0.367**
	Area	0.444**	0.463**	0.458**	0.410*	0.265*	0.389**
LDL	Left AP	0.208*	0.401**	0.279*	0.276*	0.264*	0.171
	Right AP	0.425**	0.398**	0.388**	0.416**	0.385**	0.395**
	LR	0.366*	0.417**	0.164	0.104	0.104	0.109
	Area	0.488**	0.481**	0.467**	0.462**	0.422**	0.347**
Diaphragm motional metrics
CP	Left CC	0.342**	0.269*	0.391**	0.351**	0.345**	0.445**
	Right CC	0.292*	0.217*	0.366**	0.341**	0.328**	0.434**
	Area	0.383**	0.383*	0.329**	0.276**	0.269*	0.400*
RSP	AND	0.167	0.167	0.143	0.153	0.169	0.145
	APD	0.205	0.205*	0.335**	0.350**	0.359**	0.340**
	POD	0.341*	0.341*	0.325**	0.333**	0.305*	0.320**
	Area	0.390**	0.390**	0.403**	0.416**	0.391**	0.429**
	DH	-0.306*	0. 240*	-0.385**	-0.429**	-0.395**	-0.309**
	DA	-0.281*	0.138	-0.347**	-0.378**	-0.398**	-0.270*

Note: * indicated p<0.05; ** indicated P<0.01.TLV, total lung volume; 6-MWD, 6 min-walk distance; FVC, forced vital capacity; FEV1, forced expiratory volume; TLC, total lung capacity; DLCO, diffusing capacity of the lungs for carbon monoxide; AAL, the arcus aortae level; TCL, the tracheal carina level; LDL, the liver dome level; CP, the coronal plane; RSP, the right sagittal plane. AP, anterior-posterior (AP) distance; LR, left-right (LR)distance; CC, the cranial-caudal distance; AND, APD, POD, the distance between the lung apex and anterior, apex, and posterior of diaphragm on sagittal plane, respectively. DH, the height of diaphragm; DA, the area of diaphragm

ISSN: 1471-2466