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Articles by K. J Cho
Total Records ( 2 ) for K. J Cho
  Y. H Joo , D. I Sun , J. H Cho , K. J Cho and M. S. Kim

Objective  To determine the risk factors related to postoperative pulmonary complications in patients who undergo supracricoid partial laryngectomy.

Design  Retrospective analysis of medical records.

Setting  Tertiary care referral center.

Patients  One hundred eleven patients who underwent supracricoid partial laryngectomy from January 1, 1993, through December 31, 2008.

Main Outcome Measures  Relationship between postoperative pulmonary complications and perioperative risk factors, such as age, sex, chronic lung disease, smoking status, tumor site, tumor stage, preoperative irradiation, extent of surgery, reconstruction method, and pulmonary function tests.

Results  Thirty-six patients (32.4%) developed postoperative pulmonary complications. Significant correlations were found among age (P = .002), chronic lung disease (P = .005), smoking status (P = .02), and postoperative pulmonary complications. Cricohyoidopexy (P = .008) and ipsilateral arytenoidectomy (P = .03) were associated with postoperative pulmonary complications. The multivariate analysis showed a significant association of the postoperative pulmonary complications with age (odds ratio [OR], 3.8; 95% confidence interval [CI], 1.2-11.7 in patients 60 to 69 years old; and OR, 7.1; 95% CI, 1.3-37.6 in patients 70 to 79 years old) and cricohyoidopexy (OR, 4.4; 95% CI, 1.1-18.1).

Conclusion  Patients 60 years or older and patients with cricohyoidopexy are at high risk of having postoperative pulmonary complications after supracricoid partial laryngectomy.

  K. J Cho , T Reponen , R Mckay , R Shukla , H Haruta , P Sekar and S. A. Grinshpun

The aim of this study was to investigate respirator filter and faceseal penetration of particles representing bacterial and fungal spore size ranges (0.7–4 µm). First, field experiments were conducted to determine workplace protection factors (WPFs) for a typical N95 filtering facepiece respirator (FFR). These data (average WPF = 515) were then used to position the FFR on a manikin to simulate realistic donning conditions for laboratory experiments. Filter penetration was also measured after the FFR was fully sealed on the manikin face. This value was deducted from the total penetration (obtained from tests with the partially sealed FFR) to determine the faceseal penetration. All manikin experiments were repeated using three sinusoidal breathing flow patterns corresponding to mean inspiratory flow rates of 15, 30, and 85 l min–1. The faceseal penetration varied from 0.1 to 1.1% and decreased with increasing particle size (P < 0.001) and breathing rate (P < 0.001). The fractions of aerosols penetrating through the faceseal leakage varied from 0.66 to 0.94. In conclusion, even for a well-fitting FFR respirator, most particle penetration occurs through faceseal leakage, which varies with breathing flow rate and particle size.

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