Neurotransmitter-based diagnosis and treatment: A hypothesis (Part 1)

Serotonin deficiency (Table 1^14,19-29)

Mr. A is chronically depressed, hopeless,¹⁹ and easily angered.²¹ He does not believe anyone can help him.¹⁹ You are concerned for his safety because he had attempted to end his life by shooting himself in the chest.^19,21,22,25 Even when he’s not particularly depressed, Mr. A does not enjoy much of anything.^21,26,27 He becomes particularly agitated when he drinks alcohol,²⁵ which unfortunately is common for him.²⁹ He engages in binge eating to feel better; he knows this is not healthy but he cannot control his behavior.^20,29 Mr. A is poorly compliant with his medications, even with a blood thinner, which he was prescribed due to an episode of deep vein thrombosis. He complains of chronic daily headaches and episodic migraines.^23,24 He rarely blinks,^23,28 his skin is dry and cool, his hair is brittle,²³ his mouth is dry,^14,23,27 and he constantly licks his chapped lips.^14,26,27 Mr. A frequently has general body pain^26,31 but is dismissive of his body aches and completely stops reporting pain when his depression gets particularly severe. When depressed, he is slow in movement and thinking.^14,21,26,27 He is more concerned with anxiety than depression.²¹ Mr. A is plagued by constipation, abdominal pain, muscle tension, and episodes of shaking.^14,26,27 He also frequently complains about chronic tinnitus.²⁸

Impression. Mr. A shows symptoms associated with serotonin hypoactivity. SSRIs and any other antidepressants with serotonin activity would be an obvious choice for treatment. A mood-stabilizing antipsychotic with serotonin activity would be welcome in treatment. Thyroid hormone supplementation may be of value, especially if thyroid stimulating hormone level is high. Light therapy, a diet with food that contains tryptophan, psychotherapy, and exercise are desirable. Avoiding benzodiazepines would be a good idea.

Dopamine excess (Table 2^14,30-41)

Ms. L presents with complaints of “fibromyalgia” and “daily headaches,”¹⁴ and also dissociation (finding herself in places when she does not know how she got there) and “out-of-body experiences.”³² She is odd, and states that people do not understand her and that she is “different.”³⁸ Her friend, who is present at the appointment, elaborates on Ms. L’s bizarreness and oddness in behavior, out-of-context emotions, suspiciousness, paranoia, and possible hallucinations.^35,36,38 Ms. L discloses frequent diffuse body pains, headaches, nausea, excessive salivation, and tongue burning, as well as muscle twitching.¹⁴ Sex worsens her headaches and body pain. She reports seizures that are not registered on EEG. In the office, she is suspicious, exhibits odd posturing, tends to misinterpret your words, and makes you feel uncomfortable. Anxiety³⁸ and multiple obsessive-compulsive symptoms, especially excessive cleaning and grooming, complicate Ms. L’s life.^31,32,34 On examination, she is hypertensive, and she has scars caused by self-cutting and skin picking on her arms.^30-32 An electrocardiogram shows an elevated heart rate, widened QRS complex, and ectopic heartbeats.¹⁴ Ms. L has experienced trichotillomania since adolescence^32-34 and her fingernails are bitten to the skin.³⁴ She has difficulty with impulse control, and thrill-seeking is a prominent part of her life, mainly via gambling, compulsive sex, and compulsive buying.^35,36 She also says she experiences indigestion and delayed gastric emptying.³⁷

Impression. Ms. L exhibits multiple symptoms associated with dopamine excess. Dopamine antagonists should be considered and may help not only with her psychiatric symptoms but also with her pain symptoms. Bupropion (as a dopamine agonist), caffeine, and stimulants should be avoided.

Excessive dopamine is, in extreme cases, associated with somatic psychosis, somatic symptom disorder, factitious disorder, pain disorder, and hypochondria.³⁹ It may come with odd and bizarre/peculiar symptoms out of proportion with objectively identified pathology. These symptoms are common in chronic pain and headache patients, and need to be addressed by appropriate use of dopamine antagonizing medications.³⁹

Continue to: Dopamine deficiency