Changes in Serum Electrolytes, ECG, and Baroreflex Sensitivity during Combined Pituitary Stimulation Test
Sungsu Kim1, Choong Hwan Kwak2,3, Jaehoon Jung3,4
1Division of Endocrinology and Metabolism, Department of Internal Medicine, ISAM Hospital, Busan, Republic of Korea.
Biomed Research International
|August 15, 2018
Summary
Hypoglycemia significantly alters electrolytes and cardiac function, impacting cardiovascular risk. This study links corrected QT intervals to sodium levels during pituitary stimulation tests.
Area of Science:
- Cardiology
- Endocrinology
- Clinical Physiology
Background:
- Hypoglycemia's link to cardiovascular mortality is not fully understood.
- Electrolyte and electrocardiographic changes during hypoglycemia require further investigation.
Purpose of the Study:
- To investigate changes in serum electrolytes, norepinephrine, ECG, and baroreflex sensitivity (BRS) during combined pituitary stimulation tests (CPST).
- To explore associations between corrected QT (QTc) intervals and electrolyte changes during CPST.
Main Methods:
- 12 patients suspected of hypopituitarism undergoing CPST were monitored.
- Serum electrolytes, norepinephrine, ECG parameters (QTc, QRS duration), and BRS were measured at baseline and during hypoglycemia.
- Statistical analyses identified significant changes and associations.
Main Results:
- Significant changes in serum potassium, sodium, chloride, and calcium were observed during hypoglycemia.
- Heart rate, QTc interval, QRS duration, and BRS significantly increased during hypoglycemia.
- A positive association was found between QTc intervals and serum sodium levels in patients without arrhythmia.
Conclusions:
- CPST induces significant electrolyte and cardiac electrophysiological changes.
- QTc interval changes during hypoglycemia are associated with serum sodium levels, potentially contributing to cardiovascular risk.
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