Sinha Pragya, Singh N P, Taneja D K, Sah Renuka
Department of Community Medicine, Maulana Azad Medical College, New Delhi 110002.
J Assoc Physicians India. 2010 Apr;58:225-8.
Blood pressure usually increases in winter and decreases in summer i.e, shows seasonal variation. In a tropical country like India women often complain off prominent symptoms like dizziness, giddiness, fainting and weakness during summer months. The objective was to study the prevalence of above symptoms which are common during summer and its association with variation in blood pressure among normotensive healthy females aged 18-40 years.
The present study was carried out on 132 women as a prospective observational study which included 2 home visits to the participants in the two different seasons in the months of May-June (summer) and December-January (winter) based on the data provided by the meteorological department of Government of India. Blood pressure and pulse rate (hemodynamic variables) was measured in these seasons and information was collected on the occurrence of the symptoms in these seasons.
There was mean decrease of 11.07 +/- 10.29 mm of Hg in Systolic blood pressure & 6.79 +/-6.88 mm of Hg in diastolic blood pressure in summer as compared to winter. The symptoms in the form of weakness, dizziness and blackout which are generally perceived by women in this area to be due to low blood pressure were observed in 32.6% of the study subjects in summer compared with 2.3% in winter. The difference was statistically highly significant (p < 0.001). There was no significant difference between the mean value of electrolytes, creatinine and urea in the cases and the controls.
Thus the seasonal variation in blood pressure rather than electrolytes abnormality may be responsible for these symptoms.
血压通常在冬季升高，夏季降低，即呈现季节性变化。在印度这样的热带国家，女性经常抱怨在夏季出现诸如头晕、眩晕、昏厥和虚弱等明显症状。目的是研究这些夏季常见症状的患病率及其与18至40岁血压正常的健康女性血压变化的关联。
本研究对132名女性进行前瞻性观察研究，根据印度政府气象部门提供的数据，在5月至6月（夏季）和12月至1月（冬季）这两个不同季节对参与者进行2次家访。在这些季节测量血压和脉搏率（血液动力学变量），并收集这些季节中症状发生的信息。
与冬季相比，夏季收缩压平均下降11.07±10.29毫米汞柱，舒张压平均下降6.79±6.88毫米汞柱。该地区女性通常认为因低血压导致的虚弱、头晕和昏厥等症状，在夏季32.6%的研究对象中出现，而冬季为2.3%。差异具有高度统计学意义（p<0.001）。病例组和对照组的电解质、肌酐和尿素平均值之间无显著差异。
因此，血压的季节性变化而非电解质异常可能是这些症状的原因。
