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Intraoperative hypertension during thyroidectomy for Graves' disease
A K Sharma1, S K Mishra, A Mithal
1Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow.
Insights
Patients with well-controlled Graves' disease experience significant intraoperative cardiovascular instability, including hypertension and tachyarrhythmia. This instability is more common in Graves' disease than in toxic nodular goiter or euthyroid goiter patients.
Area of Science:
- Endocrinology
- Cardiology
- Anesthesiology
Background:
- Hyperthyroidism, particularly Graves' disease, is linked to cardiovascular issues.
- Intraoperative cardiovascular instability can complicate management even in well-controlled hyperthyroid patients.
Purpose of the Study:
- To investigate the incidence and nature of intraoperative cardiovascular instability in patients with Graves' disease compared to other thyroid conditions.
- To identify potential factors contributing to this instability in Graves' disease.
Main Methods:
- Retrospective analysis of 137 patient records.
- Comparison of patients with Graves' disease (n=35), toxic nodular goiter (n=42), and euthyroid benign goiter (n=60).
- Assessment of cardiovascular events like hypertension, tachyarrhythmia, and bradycardia during surgery.
Main Results:
- Graves' disease patients showed a significantly higher incidence of intraoperative hypertension and tachyarrhythmia (9/35) compared to toxic nodular goiter (3/42) and euthyroid goiter (2/60) patients.
- Elevated T3 and T4 levels at presentation correlated with a higher incidence of these cardiovascular complications.
- Despite well-controlled thyrotoxicosis, instability was observed.
Conclusions:
- Well-controlled Graves' disease poses a higher risk of intraoperative cardiovascular instability than other goiter types.
- Further research is needed to explore the roles of catecholamine sensitivity and renin-angiotensin system activation in these findings.
Abstract:
Hyperthyroidism is well known to be associated with cardiovascular manifestations. The authors have noted that patients of well controlled Graves' Disease often pose problems due to intrapoperative cardiovascular instability. Retrospective analysis of 137 case records of patients with Graves' disease (n = 35), toxic nodular goitre (n = 42) and those with euthyroid benign goitre (n = 60) were studied. In Graves' disease cardiovascular instability was found in the form of hypertension (n = 9) associated with tachyarrhythmia (n = 8) and bradycardia (n = 3). The incidence of first 2 of the above mentioned 3 problems was significantly higher in Graves disease (n = 9/35 patients) in contrast to a comparable group of patients with toxic nodular in (3/42 patients; P value 0.05) and euthyroid goiter (2/60 patients; P value < 0.001). Certain parameters such as high T3, T4 at the time of presentation were associated with higher incidence of these complications, in spite of very well controlled thyrotoxicosis. Whether heightened receptor sensitivity to catecholamines and higher renin-angiotensin activation explain these findings in Graves' disease, remains to be ascertained.