Medical Hypotheses 9:
179-181, 1982
LITHIUM CARBONATE IN VASOSPASTIC DISORDERS Julian Lieb 41 Village Lane, Pethany, Connecticut 06525 ABSTRACT Abnormal thermoregulation is a hallmark of many vasospastic disorders. Lithium carbonate is capable of reversing hypothermia and may be of prophylactic value in vasospastic disorders. INTRODUCTION Recently, an association between migraine, Raynaud's phenomenon, and variant angina has been identified. (1). I propose that a common underlying mechanism could be a thermoregulatory disorder caused by a disturbance in prostaglandin synthesis, and that lithium carbonate could be a prophylactic agent for all three conditions.
HYPOTHESIS Exposure to cold temperature or to wind may accentuate or precipitate the symptoms of angina, and Raynaud's phenomenon is essentially a cold sensitivity disease. There is also good evidence of a disturbance of thermoregulation in migraine (2-3). Prostaglandins play an important role in thermoregulation (4) and are in turn influenced by ambient temperature (5). Cold appears to reduce thromboxane A2 (TXAZ) synthesis in blood vessels and Horrobin has proposed that in patients with Raynaud's phenomenon cold may lead to excessive synthesis of prostaglandins secondary to reduced TXA2 synthesis (6). Prostaglandin E has a potent vasodilator effect on cerebral blood vessels, and prostaglandin F2 alpha causes vasoconstriction of the arterioles in the internal carotid system (7). Injection of prostaglandins can cause headache in susceptible subjects (8) and in some patients migraine headache can be alleviated by prostaglandin synthesis inhibitors (9). There is also evidence of disturbed prostaglandin synthesis or metabolism in coronary artery disease (lo), angina (ll), and cardiac arrhythmias (12).
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Lithium is effective prophylactically for some patients with vascular headaches (13~14~15) and 1 have reported remission of Raynaud's phenomenon in patients taking lithium (16). Competitive, always-pressed-for-time behavior, which has been termed Type A behavior, is associated with coronary artery disease (17). This pattern of behavior is characteristic of hypomanic individuals, which is one of the observations that led Voors to propose that lithium depletion could be a factor in atherosclerotic heart disease (18). CONCLUSION Lithium influences both thermoregulation and prostaglandin synthesis. It raises body temperature in manic depressives (19), it is capable of reversing hypothermia (20), and, by limiting the mobilization and conversion of dihomogammalinolenic acid it stabilizes prostaglandin El synthesis (21). Lithium is an effective remedy for such vasospastic disorders as cluster headache (13,14,15) and Raynaud's phenomenon (16). It is effective in many inflammatory and immune disorders that are characterized by unpredictable relapses and remissions (22). Thus, there is biochemical, epidemiological and clinical evidence to support the proposition that lithium may be of value in the prophylaxis of vasospastic disorders in general and of variant angina in particular.
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