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Table of Contents  
CASE REPORT
Year : 2017  |  Volume : 11  |  Issue : 4  |  Page : 1115-1117  

Anaesthetic implications of severe hyperthyroidism secondary to molar pregnancy: A case report and review of literature


Department of Anaesthesiology, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India

Date of Web Publication28-Nov-2017

Correspondence Address:
Srinivasan Swaminathan
Department of Anaesthesiology, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/aer.AER_38_17

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   Abstract 


Pregnant women with gestational trophoblastic disease have an increased likelihood to develop hyperthyroidism secondary to increased secretion of human chorionic gonadotropin. Most of these cases of hyperthyroidism remain undiagnosed and may present as a thyrotoxic crisis during the perioperative period. Pregnant patients with gestational trophoblastic disease should be always evaluated for hyperthyroidism, and in cases of severe hyperthyroidism, antithyroid treatment should be initiated before evacuation of the mole. Anesthetic management of these cases is challenging in view of the emergency nature of the surgery and potential for thyroid crisis. Spinal anesthesia can be safely administered and has a protective role in preventing thyroid crisis.

Keywords: Anesthetic management, hyperthyroidism, vesicular mole


How to cite this article:
Swaminathan S, James RA, Chandran R, Joshi R. Anaesthetic implications of severe hyperthyroidism secondary to molar pregnancy: A case report and review of literature. Anesth Essays Res 2017;11:1115-7

How to cite this URL:
Swaminathan S, James RA, Chandran R, Joshi R. Anaesthetic implications of severe hyperthyroidism secondary to molar pregnancy: A case report and review of literature. Anesth Essays Res [serial online] 2017 [cited 2019 May 20];11:1115-7. Available from: http://www.aeronline.org/text.asp?2017/11/4/1115/207077




   Introduction Top


Severe hyperthyroidism is one of the rare features of molar pregnancy. The condition usually occurs in patients with advanced untreated disease due to massive secretion of human chorionic gonadotropin (HCG). HCG has thyrotrophic activity because of structural similarity to thyroid-stimulating hormone (TSH).[1],[2] Anesthetic management of these cases is challenging because of risk of intraoperative thyroid storm and high-output cardiac failure. We like to report a case of advanced molar pregnancy with severe hyperthyroidism posted for suction and evacuation.


   Case Report Top


A 20-year-old primigravida at 17 weeks of gestation was admitted to our hospital with a history of spotting per vagina for 15 days and intermittent pain abdomen for the past 2 months There was no history of passage of clots or vesicles. Clinical examination revealed pallor, tachycardia with heart rate of 124/min, and hypertension with blood pressure (BP) of 140/98 mmHg. The uterus was around 20 weeks size. Pelvic ultrasonography revealed a large heterogeneous soft-tissue lesion measuring 6.9 cm in the endometrial cavity with the classical “Snow Storm appearance,” suggestive of complete molar pregnancy. Her blood investigations revealed a hemoglobin of 7 g% on admission, Serum beta-HCG was elevated and found to be >2 lac mIU/L. Thyroid function test showed elevated thyroid hormone levels serum T3 level of 347 pg/dL, serum T4 22.9 ng/L, and TSH <0.01 μ/L. Electrocardiogram (ECG) revealed sinus tachycardia.

Suction and evacuation of the mole was planned. Since the patient had features of severe hyperthyroidism, it was decided to optimize the patient preoperatively before the procedure. In consultation with endocrinologist, she was treated with tablet propranolol 40 mg b.d., antibiotics, and supportive care. During the treatment, the patient developed intermittent high-grade febrile spikes with temperature up to 103°F and two episodes of vomiting, 4 days after start of treatment patient was posted for evacuation of the mole.

Preoperatively, the patient had a heart rate of 100 bpm and BP 130/80 mmHg and SpO2 of 100% in room air. Intraoperative monitoring included ECG, SpO2, end-tidal CO2, noninvasive BP, and temperature. Subarachnoid block was administered with bupivacaine 0.5% 2 ml with 25 μg fentanyl as an additive. Vital parameters remained stable during the intraoperative period. One unit of the packed red blood cells was transfused during the procedure in view of anemia and intraoperative blood loss of 500 ml.

The patient had febrile spikes for 2 days postprocedure during which time propranolol was continued. All the features of hyperthyroidism resolved within 2 days of hydatidiform mole evacuation. A repeat thyroid function test 2 weeks later showed results within normal limits, and the beta hCG level dropped down to 82,085 after 48 h of evacuation.


   Discussion Top


The association of hyperthyroidism secondary to molar pregnancy is a rare but recognized clinical entity. Hyperthyroidism occurs in advanced untreated molar pregnancies with high titers of beta HCG because of structural similarity of beta HCG and TSH and the resultant thyrotropic activity of beta HCG.[1],[2] Diagnosis of the condition in the preoperative period is important because several reports of intraoperative thyroid storm and high-output cardiac failure had been reported secondary to thyrotoxicosis.[3],[4],[5],[6] Hence, optimization of the thyroid status and control of the hypermetabolic status is necessary before surgery to prevent this complication. Treatment has to be individualized. Some patients may require only beta blockers while others may require in addition antithyroid medications, steroids, and lugols iodine. Soutter and Norman et al. reported two cases of metastatic carcinoma complicated with thyrotoxicosis, leading to cardiac failure in one patient and severe thyroid crisis in other. They managed the patients with iodide and beta blockers and recommended routine prophylaxis for high-risk patients, using propylthiouracil, oral iodide, and propranolol [3] In another case reported by Khanna et al., a patient with gestational trophoblastic disease was managed with methotrexate, antithyroid drugs, steroids, and beta blockers for 3 weeks before being taken up for surgery.[4] A case of rapid preparation before surgery by plasmapheresis has also been reported.[7],[8] We preferred to treat with beta blockers since the patient came at an advanced stage and less time available for preoperative optimization. Beta blockers provide rapid optimization when compared to other antithyroid drugs.[9] Propranolol inhibits sympathetic overactivity, prevents the peripheral conversion of T4 to T3 and also reduces the fall in systemic vascular resistance that may occur in these cases, thereby preventing high-output cardiac failure. Various other complications that have been reported during the perioperative period include hypertension, embolization of pulmonary arteries by trophoblastic materials, hypovolemia, disseminated intravascular coagulation, and pulmonary edema.[4]

Various anesthetic techniques are reported in the literature for the management of these patients, including general anesthesia,[5] spinal anesthesia,[9],[10] and combined spinal-epidural.[11] Erturk et al. reported the management of a woman with 12 weeks of gestation with molar pregnancy with hyperthyroidism. The case was conducted under total intravenous anesthesia using propofol, remifentanil, and esmolol infusion for controlling sympathetic hyperactivity during surgery.[12] The choice of anesthesia also needs to be individualized. The major goals during the anesthetic management include perioperative prevention of thyrotoxic crisis and control of overt sympathetic response secondary to hyperthyroidism. In patients with active bleeding and severe hypotension, general anesthesia is preferred to maintain hemodynamic stability. However, volatile agents including halothane, isoflurane, sevoflurane, and desflurane cause uterine relaxation and may increase bleeding and hence may have to be used in lower concentrations. In addition, laryngoscopy in patients with hyperthyroidism may precipitate hypertensive crisis.

In the above case, subarachnoid block was preferred for the procedure because the patient was hemodynamically stable. Spinal anesthesia has several advantages over general anesthesia. It is nontocolytic and safe in hyperthyroidism.[9] Spinal anesthesia also enables earlier detection of a complication such as thyroid storm and cardiorespiratory distress. Judicious use of intravenous fluids and blood is essential since patients have potential to develop pulmonary edema.


   Conclusion Top


Hyperthyroidism should always be excluded in patients with advanced trophoblastic diseases and preoperative treatment of severe hyperthyroidism with multidisciplinary approach involving anesthesiologists, obstetricians, and endocrinologists necessary to prevent perioperative complications. Spinal anesthesia may be safely administered and has several advantages to protest against thyroid storm provided hemodynamic stability is maintained.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
   References Top

1.
Yoshimura M, Hershman JM. Thyrotropic action of human chorionic gonadotropin. Thyroid 1995;5:425-34.  Back to cited text no. 1
[PUBMED]    
2.
Padmanabhan LD, Mhaskar R, Mhaskar A, Vallikad E. Trophoblastic hyperthyroidism. J Assoc Physicians India 2003;51:1011-3.  Back to cited text no. 2
[PUBMED]    
3.
Soutter WP, Norman R, Green-Thompson RW. The management of choriocarcinoma causing severe thyrotoxicosis. Two case reports. Br J Obstet Gynaecol 1981;88:938-43.  Back to cited text no. 3
[PUBMED]    
4.
Khanna P, Kumar A, Dehran M. Gestational trophoblastic disease with hyperthyroidism: Anesthetic management. J Obstet Anaesth Crit Care 2012;2:31-3.  Back to cited text no. 4
  [Full text]  
5.
Erol DD, Cevryoglu AS, Uslan I. Preoperative preparation and general anaesthesia administration with Sevoflurane in a patient who develops thyrotoxicosis and cardiogenic dysfunction due to a hydatidiform mole. Internet J Anesthesiol 2004;8.  Back to cited text no. 5
    
6.
Kurdi MS. Hydatidiform mole: A sour encounter with a grapy case. Indian J Anaesth 2011;55:171-3.  Back to cited text no. 6
[PUBMED]  [Full text]  
7.
Erbil Y, Tihan D, Azezli A, Salmaslioglu A, Ozlük Y, Büyükören A, et al. Severe hyperthyroidism requiring therapeutic plasmapheresis in a patient with hydatidiform mole. Gynecol Endocrinol 2006;22:402-4.  Back to cited text no. 7
    
8.
Ozbey N, Kalayoglu-Besisik S, Gul N, Bozbora A, Sencer E, Molvalilar S. Therapeutic plasmapheresis in patients with severe hyperthyroidism in whom antithyroid drugs are contraindicated. Int J Clin Pract 2004;58:554-8.  Back to cited text no. 8
[PUBMED]    
9.
Tay S, Khoo E, Tancharoen C, Lee I. Beta-blockers and the thyrotoxic patient for thyroid and non-thyroid surgery: A clinical review. OA Anaesthetics 2013;1:5.  Back to cited text no. 9
    
10.
Nandini D, Sarita F, Uday A, Hemalata I. Hydatidiform mole with hyperthyroidism-perioperative challenges. J Obstet Gynecol India 2009;59:356-7.  Back to cited text no. 10
    
11.
Solak M, Aktürk G. Spinal anesthesia in a patient with hyperthyroidism due to hydatidiform mole. Anesth Analg 1993;77:851-2.  Back to cited text no. 11
    
12.
Erturk E, Bostan H, Geze S, Saracoglu S, Erciyes N, Eroglu A. Total intravenous anesthesia for evacuation of a hydatidiform mole and termination of pregnancy in a patient with thyrotoxicosis. Int J Obstet Anesth 2007;16:363-6.  Back to cited text no. 12
    




 

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