|LETTER TO EDITOR
|Year : 2013 | Volume
| Issue : 2 | Page : 282
Chest tube and air travel "Patient worsening and improving spontaneously"
Preet Mohinder Singh, Anuradha Borle, Ajisha Aravindan, Anjan Trikha
Department of Anaesthesia, All India Institute of Medical Sciences, Delhi, India
|Date of Web Publication||13-May-2013|
Preet Mohinder Singh
Department of Anaesthesia, All India Institute of Medical Sciences, Delhi
Source of Support: None, Conflict of Interest: None
|How to cite this article:|
Singh PM, Borle A, Aravindan A, Trikha A. Chest tube and air travel "Patient worsening and improving spontaneously". J Anaesthesiol Clin Pharmacol 2013;29:282
|How to cite this URL:|
Singh PM, Borle A, Aravindan A, Trikha A. Chest tube and air travel "Patient worsening and improving spontaneously". J Anaesthesiol Clin Pharmacol [serial online] 2013 [cited 2019 Dec 7];29:282. Available from: http://www.joacp.org/text.asp?2013/29/2/282/111743
We recently had a patient shifted to our tertiary care intensive care unit (ICU) via air travel. The patient was spontaneously breathing with oxygen by facemask. He had chest tube in situ and had no signs of respiratory distress prior to airlift, however, during the air travel in a medically equipped helicopter his condition worsened (desaturation up to 85% with tachypnea) and he required endotracheal intubation with ventilatory assistance, however after landing he improved within minutes and his requirement for mechanical ventilation vanished. The above finding prompted us to examine possible causes of his unique condition of spontaneous worsening and improvement.
The literature on management of patients with pneumothorax and chest drains in situ is scarce. Patients are often not optimally managed prior to air travel and clinical condition worsens in air, where management resources are limited. We discuss the physics and physiological management involved for better outcomes of such patients.
Medical helicopters fly around 500-1000 feet above the ground while commercial/medical airplanes fly at 24-40 thousand feet above the ground level. The plane cabins are often pressurized and atmosphere barometric changes may be minimal, depending upon the efficacy of pressurizing. Presuming the temperature of flight is maintained as at the ground level, thus by "Boyle's Law" the volume of gas is inversely related to its pressure.  So as the flight ascends the atmospheric pressure falls and the volume of gas trapped in closed body cavity would expand. Normal sea level pressure is 760 mmHg and on ascent to 8000 feet it falls to 560 mmHg (a 25% reduction), this would mean that air in cavities expands by 25%. Another aspect important in these patients is the decrease in PaO 2 with ascent. At sea level the partial pressure of oxygen is around 150 mmHg, on ascent it falls to around 110 mmHg (this is equivalent to use of FiO 2 of only 15% at sea level). 
In our patient, it was later realized that although chest tube was optimally functioning, he still had loculated collection that expanded (compressing lung) and in addition the lower apparent FiO 2 lead to dyspnea.  As per guidelines by American College of Chest Physicians, patients with spontaneous pneumothorax should not air travel for at least a week after complete resolution on imaging. Patients with recurrent pneumothorax or predisposition should not air travel unless a chest drain or surgical intervention is done.  In patients with a chest drain, the functioning of drain must be confirmed and no clamping should be done at the time of travel. Prior to travel, imaging must be done to rule out any extra-pulmonary air not in communication with the drain. Wherever possible patients must be transported in closed pressurized chamber planes, as the artificial air 'pumped in' maintains both external pressure and FiO 2 . 
In our patient, the size of loculated air, on landing again decreased and FiO 2 increased, thus patient immediately recovered. It must be kept in mind that these problems are preventable if appropriate steps are taken.
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