Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0042571 (vertigo)
 7,148 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Eighteen patients, five women and 13 men, (mean age 70 +/- S.E.M. 2 years) treated with QT sensing rate responsive pacemakers due to symptomatic high degree AV block took part in a double-blind study, comparing the rate responsive (TX) mode with fixed rate ventricular inhibited (VVI) pacing. The pacemaker was blindly programmed to either mode in a cross-over design. During the 1 month period a daily diary of symptoms (chest pain, vertigo, dyspnea, and palpitations) was kept. At the end of each period, a mental stress test and an exercise test were performed. The patient rated the general well-being and stated a preference for one of the modes. In the TX mode the heart rate was significantly higher at the end of exercise compared with VVI (107 +/- 4 vs 73 +/- 3 bpm; P less than 0.001) and the exercise tolerance was improved by 9% (104 +/- 8 vs 96 +/- 7 W; P less than 0.01). The patients reported significantly less dyspnea and fatigue at comparable workloads with TX pacing. During the mental stress test the pacing rate increased by 10% in the TX mode (from 73 +/- 2 to 82 +/- 4 bpm; P less than 0.001). There was a physiological rate variability on 24-hour Holter monitoring. Ten patients reported a significant improvement in feeling of general well-being in the TX mode. Eleven patients preferred the TX mode, five patients could not distinguish between the modes and two patients preferred the VVI mode due to worsening of angina pectoris with TX pacing. This preference for the TX mode was significant (P less than 0.05). The results of this controlled study indicate that TX is preferable to VVI in most cases, but the worsening of angina pectoris in two of the patients and the occurrence of rapid rate oscillations in a third patient are factors that warrant some caution in selecting patients.
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PMID:QT sensing rate responsive pacing compared to fixed rate ventricular inhibited pacing: a controlled clinical study. 246 48

Drugs interfering with sympathetic tone may result in depression of the function of the sinus node, especially in patients with disease of the sinus node. In 11 patients presenting with palpitations, vertigo, or syncope, the heart rate, the recovery time of the sinus node, the carotid sinus pressure slowing, and the atrioventricular conduction capacity were assessed before and every five minutes up to 30 minutes after intravenous administration of 0.15 mg of clonidine. The following significant maximal mean effects were noted at about 15 minutes after the administration of clonidine: the heart rate decreased 12 percent (59 vs 52 beats per minute); and the atrioventricular conduction capacity (ie, paced heart rate at second-degree atrioventricular block) decreased by 9 percent (132 vs 121 beats per minute), while the maximal recovery time of the sinus node increased by a factor of two (1,704 vs 3,562 msec) when atrial overdrives of 120, 150, and 200 beats per minute were used for each five minute period. In analyzing maximal carotid sinus pressure slowing after administration of clonidine, three of 11 patients developed hypersensitive carotid sinus reflex de novo, and two patients showed a decrease and three patients an increase of carotid sinus pressure slowing, while three patients had no carotid sinus pressure slowing both before and after administration of clonidine. We conclude that caution should be taken in administering clonidine to patients with signs indicative of dysfunction of the sinus node.
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PMID:Effects of clonidine on sinus node function in man. 701 48

We report a case of polymyositis with extensive disturbance of the cardiac conduction system. A 55-year-old woman had received corticosteroids for the treatment of polymyositis for six years. She was admitted to our hospital because of palpitations and vertigo. Abnormalities on electrocardiogram (right bundlebranch block, right axis deviation, and atrioventricular block) and prolonged H-V time on His bundle electrogram revealed extensive disturbance of the cardiac conduction system. Myocardial pathology showed perivascular fibrosis and fatty infiltration. As shown is this case, patients with polymyositis often develop severe cardiac disorders. Therefore, the attention should be paid to the cardiac condition of there patients.
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PMID:[A case of polymyositis associated with extensive disturbance of cardiac conduction]. 757 Feb 12