Diabetes Care 30:2501-2502, 2007 DOI: 10.2337/dc07-0597 © 2007 by the American Diabetes Association
Seasonal Changes in Preprandial Glucose, A1C, and Blood Pressure in Diabetic PatientsFrom the Department of Endocrinology and Metabolism, Da Chien Hospital, Miaoli, Taiwan Address correspondence and reprint requests to Wen Wei Liang, MA, No. 72-1 Fusing Rd., Tongluo Shiang Miaoli County, Taiwan, ROC. E-mail: l6105180@cm1.hinet.net
The American Diabetes Association has recommended glycemic goals for nonpregnant diabetic individuals (1). These goals are aimed at controlling blood glucose levels, blood pressure, and lipid profiles. In addition, seasonal variation of blood pressure has been recognized and found to exist in both normotensive subjects and hypertensive patients (2). However, the relation between blood pressure patterns, as well as blood glucose levels and lipid profiles, in diabetic patients and seasonal cycles remains unclear.
We collected data from all patients who received treatment at the endocrinology and metabolism clinic at Da Chien Hospital (Miaoli, Taiwan) at least two times per year from 2003 to 2006. The clinic opened in May 2002, and data excluding personal information were retrieved from the hospital data bank; this procedure was approved by Da Chien Hospital. There were diabetic patients treated at the clinic in 2003 (n = 465), 2004 (n = 615), 2005 (n = 599), and 2006 (n = 662). Some patients (n = 212) were retained throughout the entire study period, while others only attended the clinic for a fraction of the 2003–2006 time frame. The mean diabetes duration in these patients
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