Hypothesis: We hypothesized that high be derived transtracheal oxygen (HFTTO) will improve exercise tolerance as compared with grave flow transtracheal oxygen (LFTTO) and that transtracheal oxygen (TTO) will increase exercise tolerance with les dyspnea as compared with nasal prong (NP) at equivalent oxygen saturation ([SaO.

Hypothesis: We hypothesized that high be derived transtracheal oxygen (HFTTO) will improve exercise tolerance as compared with grave flow transtracheal oxygen (LFTTO) and that transtracheal oxygen (TTO) will increase exercise tolerance with les dyspnea as compared with nasal prong (NP) at equivalent oxygen saturation ([SaO.sub.2]).

Patient selection: Ten exposes six male and four female, who were already receiving TTO were recruited for the study

cogitation design: Each subject underwent a total of four modified progressive treadmill criterions in a single-blind randomized fashion upon two separate days. Two ordeals were performed with the patients receiving LFTTO and HFTTO while the other sum of two units were performed with low- and high-flow oxygen at NP. The flows were adjusted to provide equivalent oxygen saturations at quiet for respective groups.

Results: The mean[+ or -]SD exercise distance with HFTTO (1134 [+ or -]631 ft) was 25 times greater than with LFTTO (446 [+ or -] 328 ft; p[les than]0.006); and high-flow NP (HFNP [1207 [+ or -] 763 ft]) was 238 times greater than with low-flow NP (LFNP[492 [+ or -] 487 ft; p [les than] 0005]) There was no significant difference in exercise distance and dyspnea scores with HFTTO as compared with HFNP and LFTTO versus LFNP

Conclusion: We infer that the use of high-flow oxygen via the two transtracheal catheter and NP significantly increased exercise tolerance in our COPD patients when compared to low-flow oxygen Transtracheal oxygen did not increase maximum exercise tolerance with les dyspnea as compared with oxygen via NP at equivalent [SaO.sub.2].

Previous reports with transtracheal oxygen (TTO) have demonstrated improvements in exercise capacity as judg by way of exercise time,[1] 12-min walk distance[2] and distance walked onward the treadmill.[3] The event of oxygen flow via transtracheal catheter forward exercise tolerance and sensation of dyspnea has not been well studied. A previous reflection by Couser and Make[4] base significant reduction in inspired minute ventilation VI with TTO. They demonstrated that low-flow TTO (LFTTO) at 2 L/min decreased VI according to 28 percent, and increasing the TTO liquefy to 6 L/min decreased VI further to 49 percent of baseline when TTO is not used. Kollef and Johnson[5] demonstrated that the sensation of dyspnea as measured on the visual analog scale is modified at TTO and transtracheal air and is unrelated to the oxygen saturation ([SaO.sub.2]) flush It was felt that TTO bring tos the inspiratory work of breathing and may be the reason for decreased dyspnea and increased exercise tolerance.

Based onward the aforementioned studies, we hypothesized that high-flow TTO (HFTTO) will improve exercise tolerance as compared with LFTTO and that TTO will increase exercise tolerance with les dyspnea as compared with oxygen via nasal prong (NP) at equivalent [SaO.sub.2].

METHODS

enthrall Selection

Ten enthralls six male and four female, who were receiving TTO therapy were recruited for the close attention All subjects gave informed consensus and the study was approved by the agency of the Institutional Review Board for Human Studies.

Design of the Study

Each subdue underwent a modified progressive treadmill standard protocol. This consisted of an initial work load fix at 1 mile per hour (mph)/0 percent grade. The grade was kept constant if it were not that the speed was increased by the agency of 0.5 mph every 2 min. Endpoints for the exercise exhibition were decreased [SaO.sub.2] to les than 85 percent marked shortness of breath, chest pain, periodical emphasis disturbance, or patient inability to continue. Distance in feet walked onward the treadmill was recorded for each studious mood Sensation of dyspnea was recorded forward a numeric Borg[6] scale ranging from 0 to 10 Saturation, dyspnea scores, and heart rate were recorded each minute while the subjects were forward the treadmill and during the final others of exercise. Subjects also were asked each minute if they could continue with the exercise study

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Each enthrall underwent a total of four treadmill standards Two tests were performed with the patient receiving LFTTO and HFTTO while the other brace were performed with low- and high-flow oxygen by dint of NP. The flows were adjusted to provide equivalent [SaO.sub.2] values at soft and high flows. Following are determinations for LFTTO, HFTTO, low-flow NP (LFNP) and high-flow NP (HFNP):

LFTTO--0.25 to 2 L [Osub2] to maintain [SaO.sub.2] 92 [+ or -] 1 percent at rest

HFTTO--3 to 8 L [Osub2] to maintain [SaO.sub.2] 98 [+ or -] 1 percent at rest

LFNP--05 to 4 L [Osub2] to maintain [SaO.sub.2] 92 [+ or -] 1 percent at rest

HFNP--3 to 8 L [Osub2] to maintain [SaO.sub.2] 98 [+ or -] 1 percent at quiet In order to make this a single-blind studious mood subjects received 0.5 L of airflow via NP when they received TTO and vice versa, 05 L of air via transtracheal catheter when they received oxygen via NP In addition, the one and the other air and oxygen flowmeters were hidden from the subject's view. The four trials were randomized and done forward two separate days with brace tests per visit. Exercise standards were conducted at the same time of the day with a minimum period of 30 min of interval between each test.

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