Dermatomes of hypoalgesia was @ @ segments in group P. VAS scores of rest pain ( @ @ , @ @ , @ @ , @ @ vs @ @ , @ @ , @ @ , @ @ , all P < @ ) , cough pain ( @ @ , @ @ , @ @ , @ @ vs @ @ , @ @ , @ @ , @ @ , P < @ , < @ ) and sedation scores ( @ @ , @ @ , @ @ , @ @ , @ @ , @ @ , @ @ , @ @ , P < @ ) in group P were significantly lower than in group I at the four points .