Innocuous Oral Bleeding in the Elderly

I recently had two patients that presented with similar yet vague symptoms with two very different outcomes.

The first patient was a 70s-year-old female with a history of rheumatoid arthritis and hypertension who presented after finding dried blood in her mouth throughout the day. She denied any oral and dental injury or pain. She could not identify a source of the bleeding and did not feel any active bleeding. She had no associated symptoms, no melena or any other evidence of bleeding. She had no changes in her medications, but she is on methotrexate for her RA. Her physical exam was significant for dried blood in her oropharynx without an identifiable source. Her exam was otherwise benign. Lab work was significant for platelet count of 3, but otherwise normal. She was admitted for suspected ITP. On follow-up, she was later diagnosed with methotrexate toxicity. Her platelets improved after holding her home medications.

Second patient was an 80s-year-old female with severe dementia and hypertension. She was brought in by her son with whom she lives. The patient was unable to participate in her history or exam. He stated that when he went to get her out of bed that morning, he noticed dried blood in her mouth. Again, no trauma or source of bleeding was identified. She had no observed hematemesis or hemoptysis. Otherwise, history was unremarkable other than gradual weight loss secondary to poor intake. Exam was only significant for small amounts of dried blood in the oropharynx. Her mental status was at baseline. Lab work was insignificant. However, a chest x-ray showed a previously unknown left middle lobe mass. After a long discussion about goals of care with the son, the patient went home with plans for hospice care.

I found the juxtaposition of these two patients interesting as both had a vague, non-classic complaint with a generally benign exam.

Diabetes Insipidus in Intracranial Injury/Trauma

During a string of nights, I had two separate patients that despite having different injuries presented me with an interesting question. The first was a man in his 50s with a large intracranial hemorrhage, mass effect and the beginning of herniation; the second was a young male that was the victim of a GSW to the head. However, despite the different etiologies of their injuries, they both presented to Room 9 literally yelling for water. One became so combative in his demands for water, he had to be restrained.

This got me thinking; in the setting of very serious injuries, why is the only thing that concerns these men oral hydration?

The most concise information I found comes from Life in the Fast Lane. While it is referring to TBIs, the pathology relates to both of my patients as well. Thirst is controlled mostly by ADH released by the hypothalamus and transported to the posterior pituitary. Any disruption in this production chain can decrease ADH, leading to central diabetes insipidus.

In the setting of trauma, this can be caused by direct damage to the hypothalamus or posterior pituitary, disruption in their vascular supply or increased intracranial pressure/herniation that can compress these structures. Whether by a large hemorrhage or direct trauma like a GSW, intracranial injury can damage the ADH supply, leading to diabetes insipidus and the extreme thirst felt by these patients. Endocrinopathies have been associated with 30-50% of TBIs with the most common disorder being diabetes insipidus.