Ortner’s Syndrome as a Complication of Severe High-Altitude Pulmonary Edema With Acute Cor Pulmonale: A Case Report
This case report describes a rare instance of Ortner's syndrome, characterized by left vocal cord paralysis, occurring as a reversible complication of severe high-altitude pulmonary edema and acute cor pulmonale in a soldier at extreme altitude, which resolved following treatment and recovery of pulmonary hemodynamics.
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At high elevations, where the air is thin and oxygen is scarce, the human body faces a unique physiological challenge. The lungs must work harder to extract what little oxygen is available, and in some individuals, this stress causes the blood vessels within the lungs to tighten dangerously. This narrowing forces the heart to pump with much greater force, a condition known as pulmonary hypertension. When this pressure becomes severe, it can strain the right side of the heart, which is responsible for sending blood to the lungs. While this strain is a known danger of high-altitude illness, it can also trigger a rare and unexpected side effect involving the voice. A specific nerve that controls the vocal cords, which takes a long, winding path through the chest, can become compressed by the enlarged blood vessels. This compression leads to a hoarse voice, a condition doctors call Ortner's syndrome. For decades, this phenomenon was primarily linked to chronic heart valve diseases, but the question remains whether sudden, acute changes in blood pressure at extreme altitudes can cause the same problem.
A team of researchers from the Armed Forces Medical College in India recently documented a striking instance of this occurrence. They followed a twenty-three-year-old soldier stationed at an extreme altitude of 19,500 feet. For three months, the soldier had been healthy, but after a period of intense physical exertion, he began to experience rapidly worsening breathlessness. Within two to three days, his condition deteriorated from being able to walk normally to being unable to breathe even while resting. He began coughing up frothy, blood-tinged fluid, his face swelled, and he suddenly lost his voice, developing a severe hoarseness. Medical teams initially diagnosed him with high-altitude pulmonary edema, a life-threatening form of altitude sickness where fluid fills the lungs. He was immediately given supplemental oxygen and evacuated by air to a lower altitude of 11,500 feet.
Upon arrival at the lower-altitude hospital, the soldier was in critical condition, with a heart rate of 134 beats per minute and an oxygen level in his blood that had dropped to 72 percent. While his breathing improved with oxygen and medication, and the fluid in his lungs eventually cleared, his voice did not return. Doctors noticed that his heart showed signs of significant strain, specifically on the right side, which pumps blood to the lungs. An ultrasound of his heart revealed that the right ventricle was enlarged and struggling, and the pressure in the main artery leading to the lungs was extremely high, estimated at 84 millimeters of mercury. A specialized scan of his chest confirmed that the main pulmonary artery was significantly dilated, measuring 36.6 millimeters, but ruled out blood clots or tumors as the cause.
To investigate the persistent hoarseness, the medical team examined the soldier's throat and neck. They found that the left vocal cord was stuck in a fixed position and could not move. Scans of his neck and chest showed no tumors, no inflammation, and no damage from previous injuries that could explain the paralysis. The only logical explanation was that the massively enlarged pulmonary artery, swollen by the extreme pressure, was pressing against the left recurrent laryngeal nerve as it passed through the chest. This nerve, which loops under the aorta and travels near the pulmonary artery, was being squeezed, causing the vocal cord to freeze. This specific condition, where a heart or lung problem causes voice loss, is known as Ortner's syndrome.
The soldier was treated with supportive care, including non-invasive breathing assistance and medication to lower the pressure in his lungs. Over the following months, his condition was monitored closely. By the one-month mark, his breathing had returned to normal, and the strain on his heart had eased, though his voice remained hoarse. Six months after the initial incident, a final check-up revealed that the pressure in his lungs had completely normalized, and his vocal cord had regained full movement. His voice returned to normal, and he was able to resume his daily activities without limitation.
This case provides clear evidence that Ortner's syndrome is not limited to chronic, long-term heart diseases but can also arise from the sudden, severe pressure changes seen in extreme high-altitude illness. The researchers concluded that the rapid expansion of the pulmonary artery during acute high-altitude pulmonary edema can temporarily compress the nerve, leading to voice loss. Because the underlying cause was the temporary swelling of the blood vessels rather than permanent damage, the nerve function recovered once the pressure subsided. The study highlights that when a person at high altitude develops unexplained hoarseness alongside breathing difficulties, doctors should consider this rare connection. It suggests that treating the high blood pressure in the lungs is the key to restoring the voice, and that with proper care, the damage to the nerve can be fully reversible.
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