(CHEST 2004; 125:302–304) A 56-year-old man presented with complaints of dysphagia and shortness of breath for the past 2 days. He denied chest pain, cough, fever, chills, or chest trauma. Ten days prior to hospital admission, the patient was self-treated with the Heimlich maneuver after choking on a piece of candy. The patient had a 120 –pack-year history of smoking and a medical history signi...

Evidence Six systematic reviews of RCTs consistently supported Epley maneuvers (as classically described) despite considerable heterogeneity among trials.1-6 • Most recent review (11 RCTs, N = 745)1: -Results were statistically significant for the Epley maneuver versus control at 24 hours and 4 weeks. —Resolution of symptoms (5 RCTs, n = 273): 56% versus 21% with control (NNT = 3). —Positive to...

require the use of color in order to fully convey their points. Foreword Six years ago, the Marine Corps embarked on new efforts based on the " New Sciences " to provide quantitative answers, where possible, to the important questions facing military decision-makers. Maneuver Warfare Science 1998 described some initial thoughts on providing support to these decision-makers in areas that our tra...

In a swing-by maneuver, the variation of energy spacecraft is controlled by angle, velocity, and distance approach. These parameters are defined incoming trajectory, when far from planetary atmosphere. The passage atmosphere generates aerodynamic forces, affecting its trajectory giving new forms control, which functions attitude spacecraft. This maneuver called aerogravity-assist maneuver. cont...

In this paper, a closed-loop switching function for on-off thruster firings is proposed to provide good attitude control performance in the presence of modeling errors for single-axis slew maneuver of a rigid spacecraft and to eliminate double-sided thruster firings. The size of a single-sided deadband in the switching function provides the capability of a tradeoff between maneuver time and fue...

Paroxysmal supraventricular tachycardia (PSVT) is a common clinical problem. Valsalva maneuver and adenosine are effective therapies for many patients with PSVT, although any conversion to an irregular or wide complex tachycardia should prompt consideration of a preexcitation syndrome. We report a case where the Valsalva maneuver and adenosine, in a patient with PSVT and previously undiagnosed ...