Effects of Clonidine on Sinus Node Function in Man
| Autor: | Helmut Neuss, Jochen Thormann, Martin Schlepper, Veselin Mitrovic |
|---|---|
| Rok vydání: | 1981 |
| Předmět: |
Male
Pulmonary and Respiratory Medicine medicine.medical_specialty Coronary Disease Critical Care and Intensive Care Medicine Clonidine Diabetes Complications Electrocardiography Heart Conduction System Heart Rate Internal medicine Vertigo Heart rate Bradycardia otorhinolaryngologic diseases medicine Palpitations Humans Sinus (anatomy) Aged Clinical Trials as Topic biology medicine.diagnostic_test business.industry Carotid sinus Middle Aged medicine.disease biology.organism_classification medicine.anatomical_structure Anesthesia Injections Intravenous cardiovascular system Cardiology Female medicine.symptom Cardiology and Cardiovascular Medicine business Atrioventricular block medicine.drug |
| Zdroj: | Chest. 80:201-206 |
| ISSN: | 0012-3692 |
| DOI: | 10.1378/chest.80.2.201 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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