- Case report
- Open Access
- Open Peer Review
Full normalization of severe hypertension after parathryoidectomy – a case report and systematic review
© The Author(s). 2018
- Received: 19 June 2017
- Accepted: 19 April 2018
- Published: 11 May 2018
Although the relationship between hyperparathyroidism and hypertension has been described for decades, the role of hyperparathyroidism in hypertension in dialysis is still unclear. Following the case of a severely hypertensive dialysis patient, in which parathyroidectomy (PTX) corrected the metabolic imbalance and normalized blood pressure (BP), we tried to contextualize our observation with a systematic review of the recent literature on the effect of PTX on BP.
A dialysis patient, aged 19 years at the time of this report, with chronic kidney disease (CKD) from childhood; he was an early-preterm baby with very low birth weight (910 g), and is affected by a so-far unidentified familial nephropathy. He started dialysis in emergency at the age of 17. Except for low-dose Bisoprolol, he refused all chronic medication; hypertension (165–200/90–130 mmHg) did not respond to attainment of dry weight (Kt/V > 1.7; BNP 70–200 pg/ml pre-dialysis). He underwent subtotal PTX 1 year after dialysis start; after PTX, his blood pressure stabilized in the 100–140/50–80 range, and is normal without treatment 5 months later.
Our patient has some peculiar features: he is young, has a non-immunologic disease, poor compliance to drug therapy, excellent dialysis efficiency. His lack of compliance allows observing the effect of PTX on BP without pharmacologic interference.
The prompt, complete and long-lasting BP normalization led us to systematic review the current literature (Pubmed, Embase, Cochrane Collaboration 2000–2016) retrieving 8 case series (194 cases), and one case report (3 patients).
The meta-analysis showed a significant, albeit moderate, improvement in BP after PTX (difference: systolic BP -8.49 (CI 2.21–14.58) mmHg; diastolic BP -4.14 (CI 1.45–6.84) mmHg); analysis is not fully conclusive due to lack of information on anti-hypertensive agents. The 3 cases reported displayed a sharp reduction in BP after PTX.
In summary, PTX may have a positive influence on BP control, and may result in complete correction or even hypotension in some patients. The potential clinical relevance of this relationship warrants prospective large-scale studies.
- Case report
- Systematic review
Hyperparathyroidism has long been associated with arterial hypertension [1, 2]. The mechanisms at the basis of this effect are only partially understood. They are probably modulated by a series of factors, including the severity of the hyperparathyroidism, its type and the presence of other metabolic derangements. While parathyroid hormone (PTH) itself is a vasodilator, perhaps as the result of increased prostaglandin production, hyperparathyroidism in end stage renal disease is thought to produce hypertension by encouraging entry of calcium into the smooth muscle cells vascular walls [3–6].
If excess PTH induces hypertension, a decline in blood pressure should follow ablation of parathyroid function in dialysis patients with severe hyperparathyroidism and hypertension. Overall, the data suggest that, at least in selected patients, parathyroidectomy (PTX) is associated with an improvement in blood pressure control [7–13]. However, the entity of the effect is not entirely clear, as well as the interference between blood calcium levels, dialysate calcium and the overall intradialytic calcium mass balance [7, 14, 15].
The practice of PTX in dialysis patients has changed over time. While in the past surgery often represented the only way to correct a severe metabolic imbalance in the context of hyperparathyroidism, improvements in dialysis efficacy, and the new generations of drugs active on the Ca-Phosphate-PTH axis have sharply reduced the need for PTX. The issue is however still open, and in recent years a number of large studies have suggested reconsidering PTX, not only for the immediate metabolic advantages it produces, but also because of an apparent survival advantage in patients who underwent surgical correction [16–23].
In this context, several recent studies addressed the relationship between cardiovascular diseases and PTX. While a positive effect on overall cardiovascular status is reported in many large series, some papers considered the unsolved issue of the relationship between hyperparathyroidism and elevated blood pressure in dialysis patients, once more leading to controversial results [9, 12, 13, 17].
It is in this context that we would like to report on an emblematic case, a young dialysis patient whose severe hypertension was fully corrected by PTX, and review the recent literature on this subject, to underline the importance of this intriguing relationship, which is rarely adequately taken into account in current clinical practice.
A young dialysis patient, aged 19 years at the time of the present report. Chronic kidney disease (CKD) was evident from childhood: at 9 years of age his serum creatinine was 1.04 mg/dL (92 μmol/L). The patient was an early-preterm baby (born at 30 weeks) with very low birth weight (910 g), both elements associated with an increased risk of developing several metabolic diseases including CKD .
He is affected by a so far unidentified familial kidney disease: his 57-year-old mother has Stage 4 CKD and his sister underwent preemptive kidney transplantation at the age of 22. In all family members CKD is characterized by low-grade proteinuria, relatively high uric acid levels, and no microhematuria, consistent with the hypothesis of an interstitial nephropathy. The family history is marked by low compliance with treatments and controls, and a precise characterization of the genetic disease has not yet been possible. A search for mutations of UMOD and REN, and the enzyme assessment for Fabry’s disease, tested negative; HLA-B27 is negative; his karyotype is normal and no other clinical element suggested other common monogenic nephropathy (no deafness, visual disturbances, angiokeratoma). Genetic reevaluation is on-going.
Clinical and laboratory characteristics of our patient before and after parathyroidectomy
Start of dialysis (12/2015)
Start of dialysis in emergency
Biochemical data: BUN: 245 mg/dl (40.8 mmol/l), creatinine: 18.43 mg/dl (1630 umol/l), bicarbonates: 13 mmol/l, albumin: 2.6 g/dl; BNP: > 4000 pg/ml.
PTH: > 1500 ng/l; Calcium: 8.52 mg/dl (2.13 mmol/l); Phosphate: 10.49 mg/dl (3.39 mmol/l)
Predialysis BP: 165–200 mmHg (systolic), 90–130 mmHg (diastolic)
Medication: Bisoprolol 2.5 mg
Dialysis schedule: 4 h × 3 weekly sessions; access: native AV fistula; Bicarbonate buffer, Ca 1.5 mmol/l, Na 138 mEq/l
Biochemical data: BUN: 41.22 mg/dl (14.7 mmol/l), creatinine: 12.85 mg/dl (1136 umol/l), bicarbonates: 19 mmol/l, BNP: > 1500 pg/ml, Calcium: 10.12 mg/dl (2.53 mmol/l), PTH: 1317 ng/l, ionized Calcium: 5.04 mg/dl (1.26 mmol/l), phosphorus: 7.58 mg/dl (2.45 mmol/l), albumin: 3.5 g/dl, vitamin D 25 OH: 39 μg/l
Kt/V (Daugirdas 2): 1.7; nPCR: 1.2 g/kg/day
Predialysis BP: 150–180 (systolic), 90–100 mmHg (diastolic)
First week post parathyroidectomy (11/2016)
Medication: Bisoprolol 2.5 mg, Calcium carbonate 1.54 g (3 times per day), Alfacalcidol 0.5 μg
Dialysis schedule: 4 h × 3 weekly sessions; access: native AV fistula; Bicarbonate buffer, Ca 1.5 mmol/l Na 138 mEq/l
Biochemical data: BUN: 54.34 mg/dl (9.06 mmol/l), creatinine: 11.48 mg/dl (1015 umol/l), bicarbonates: 19 mmol/l, PTH: 70 ng/l, Calcium: 7.12 mg/dl (1.78 mmol/l); Ionised Calcium: 3.48 mg/dl (0.87 mmol/l), albumin: 3.3 g/dl
Predialisys BP: 120–135 (systolic), 60–80 mmHg (diastolic)
Four months post parathyroidectomy (02/2017)
Medication: Bisoprolol 2.5 mg, Cholecalciferol 100,000 UI (1 vial per month), Calcium carbonate 1.54 g (2 times per day), Alfacalcidol 1 μg
Dialysis schedule: 4 h × 3 weekly sessions; access: native AV fistula; Bicarbonate buffer, Ca 1.5 mmol/l, Na 138 mEq/l
Biochemical data: BUN: 34.39 mg/dl (12.28 mmol/l), creatinine = 12.23 mg/dl (1082 umol/l), bicarbonates: 15 mmol/l, PTH: 199 ng/l, Calcium: 9.2 mg/dl (2.3 mmol/l); Ionised Calcium: 4.84 mg/dl (1.21 mmol/l), albumin: 3.6 g/dl
Predialysis arterial pressure 120–130 (systolic); 70–85 mmHg (diastolic)
Kt/V (Daugirdas 2) 1.7; nPCR: 1.2 g/kg/day
With the start of hemodialysis, he became severely hypertensive and blood pressure did not respond to weight loss. Except for low-dose Bisoprolol, started 6 months previously to prevent the subjective symptom of “palpitations” at the end of dialysis (corresponding to a heath rate of 80–100/min at the end of the treatment), which we hoped could at least partially ameliorate his severe hypertension, the patient took no chronic medications.
His blood pressure did not decrease during dialysis, although he had no clinical sign of chronic overload, no radiological sign of pulmonary overload, no oedema and normal BNP levels (between 70 and 200 pg/ml pre-dialysis). His usual weight gain between sessions was 1.5–2.5 Kg, and did not change before and after parathyroidectomy.
At time of dialysis start, his echocardiography showed non obstructive homogenous left ventricular hypertrophy with an ejection fraction of 35–40% and small circumferential pericardial effusion. The ejection fraction was restored 1 year after dialysis start (50%), shortly before the parathyroidectomy and the left ventricular hypertrophy regressed (116 g/m2 versus 172 g/m2). Due to the essential normalisation of the picture, a further control was not performed after parathyroidectomy, and is scheduled 2 years after the previous one.
All viral and immunologic tests (VHB, VHC, HIV-1 and 2, HTLV-1 and 2, antiphospholipid, antinuclear, anti DNA, anti SSA, anti-SSB, anti-Sm, anti-RNP, anti-histones, anti-PM/SCL, anti-PCNA, anti-Scl 70, anti-JO-1 antibodies, anticentromere, anti-endomisium, anti-mitochondrial type 2 and 5, anti-gp210, anti Sp100, anti SLA, anti-LKM, anti-actin antibodies) tested negative at referral (with the exception of smooth muscle antibodies at low titer: 1/200). The results were confirmed at a further recent control.
His predialysis blood pressure range, in the last month before parathyroidectomy was 165–200/90–130 mmHg, while post dialysis it was 170–190/80–100 mmHg.
His usual weight gain between sessions was 1.5–2.5 Kg, and did not change before and after parathyroidectomy.
Lack of compliance with the chronic treatment was not accompanied by lack of compliance with dialysis. In fact, he never missed a dialysis session, nor did he ever shorten dialysis time. It should be noted that his dialysis efficiency was over target, and his nutritional status was good. His chronic dialysis data are summarized in Table 1.
As optimal dialysis had failed to produce improvement, in view of kidney transplantation, our patient underwent subtotal parathyroidectomy 1 year after dialysis start. The histologic analysis of the glands confirmed the presence of diffuse parenchyma hyperplasia with cellular hypertrophy, clear organoid architecture (pseudoglandular structures) and small oxyphilic cells, with no atypia or mitosis. His calcium and PTH values dropped (induction PTH = 1317 ng/l; PTH after PTX = 161 ng/l), and he developed a symptomatic hungry bone syndrome (Table 1). After PTX, his blood pressure stabilized in the 100–140/50–80 range (min and max values in the second month after parathyroidectomy), and has remained normal without treatment up to the time of the present report (5 months later).
The PICO criteria were adopted as follows: Patients: people with secondary or tertiary hyperparathyroidism in dialysis; Intervention: parathyroidectomy; Comparators: the same patients before and after the intervention; Outcome: changes in blood pressure.
The eligibility criteria were broad, because we expected retrieval of a low number of papers with heterogeneous designs and definitions. Consequently, we included all published studies that dealt with blood pressure following parathyroidectomy. We included all study designs, i.e. prospective or retrospective cohort studies, case-control studies, trial-based analyses, and case reports. Reviews, whether or not systematic, were also searched to check for papers that had escaped from our wide search strategy.
Articles identified were screened for eligibility solely on the basis of the content: papers reporting on any outcome regarding blood pressure after parathyroidectomy were selected. Data extraction was performed by AS and double checked by GBP; discrepancies were resolved through discussion.
Statistical analysis (meta-analysis) was performed using Metanalyst Beta 3.13, for the outcome blood pressure.
The main aim and study design of the papers reviewed
Type of study
To determine the association of PTX with major cardiovascular events in nondiabetic patients with severe secondary hyperparathyroidism: comparison between medical and surgical treatments
To analyze the frequency of intradialytic hypotension and cardiovascular function before and after PTX
To describe severe long-lasting hypotension starting immediately after parathyroidectomy (3 cases)
De Santo, 2010
To investigate the prevalence of alexithymia, sleep disorders and depression in patients on hemodialysis refractory hyperparathyroidism needing PTX; to study the effects of PTX on alexithymia
To study the effects of PTX on the sleep disorders of insomniacs on maintenance hemodialysis
To study changes in health-related quality of life, pruritus and left ventricular hypertrophy in dialysis patients with tertiary hyperparathyroidism before and after PTX
To investigate the relationship between hyperparathyroidism and hypertension
To investigate the effects of medical and surgical therapy of hyperparathyroidism on blood pressure and lipid levels in chronic renal failure
To evaluate the long-term results of PTX on BP and anemia
Clinical and laboratory data before and after PTX
PTH pre/post (pg/ml)
BP pre/post (mmHg)
53.3 ± 13.3
1012 ± 247 vs 136 ± 157 (P < 0.001)
Sys:148 ± 17 vs 139 ± 18
Dia: 79 ± 10 vs 74 ± 12
(P < 0.009; < 0.007)
Ca, PO4, Ca x Ph, hemoglobin improved after PTX;
57.4 ± 12
1011(611–1402) vs 19.1 (10.3–61.6)
6 mos (P < 0.001)
Sys:138.9 ± 16.4 vs 121.2 ± 18.6
Dia: 77.6 ± 8.3 vs 69.2 ± 9.8 (P < 0.001)
Improved heart function; reduced intradialytic hypotension.
Pre PTX: 1.14 ± 1.11 drugs
Post PTX: 0.67 ± 1.2 drugs
45, 46, 30
2408 / 6
7000 / 2000
3642 / 16–30
Sys: 140; 180–200;
175–210 vs 60; 50; 100
Dia: 90; 100; 120 vs 40; 30; 60
Pre PTX Case 1: no data
Case 2: clonidine, amlodipine, atenolol
Case 3: clonidine, minoxidil
De Santo, 2010
55.8 ± 6.8
1.299.6 / 46.8
Sys: 139 vs 135
Dia: 83 vs 81
(P < 0.001, P = 0.001)
Pre PTX 100%
Post PTX 72.5%
54.6 ± 13
1434 ± 400 vs 40.3 ± 37.4
Sys: 138.9 ± 18.39 vs 130.8 ± 23.47 (P = 0.05)
Dia: 83.1 ± 11.84 vs 78.8 ± 6.7 (P = 0.05)
Beneficial effects of PTX on sleep disorders.
Pre PTX, all on combined treatment**
Post PTX: 12 /16 on antihypertensive drugs.
50 ± 11
243.6 ± 22.6 vs 9.2 ± 13.4
Sys: 141 ± 16 vs 145 ± 16
Dia: 77 ± 10 vs 80 ± 10
P = NS
No effect on pruritus; regression of left ventricular hypertrophy
Pre PTX: ACEi: 2 (17%);
Post PTX: ACEi 1 (8%) P = NS
1056 ± 803 (pre-PTX)
Sys: 140.5 ± 17.3 vs 141 ± 20.8
Dia: 81.6 ± 9.3 vs 80.4 ± 9.3 P = NS
No effect on heart rate, dry body weight
No difference after PTX
41.38 ± 10.85
1210.25 ± 262.2 vs 172.88 ± 155.88
Sys: 126 ± 25.9 vs 102.8 ± 20.5 (P < 0.01)
Dia: 74 ± 16.46 vs 64.44 ± 15.89 (P < 0.04)
Decline in BP, if PTH < 200 ng/l.
Benefits to triglyceride levels
Groups similar at baseline
Coen G, 2001
56 ± 11
1313.4 ± 1.004.1 vs 214.2 ± 357.4 (1 week-6 months)
Sys: 134.7 ± 29.2 vs 125.9 ± 25.8
Dia: 81.6 ± 14.6 vs 77.8 ± 12.9 (P < 0.001)
No difference between subtotal or total PTX; increased erythropoietin level
Anti-hypertensive number and doses reduced post PTX
The papers were in general homogeneous for age of patients (mean of about 55 years, with the exception of the previously mentioned case report in which patients were younger), but non-homogenous for the setting of the study (five from Asia and four from Europe) for indications for parathyroidectomy, and selection of patients. For example, in the study by Lin, PTX was recommended for severe secondary hyperparathyroidism defined as PTH level higher than 800 pg/ml associated with bone or joint pain, muscle weakness, irritability, itching, bone loss, anemia resistant to erythropoietin, cardiomyopathy or calciphylaxis . Instead in Saatci’s study, patients with PTH above 200 ng/L, who were unresponsive to vitamin D for 6 months, underwent total PTX with autotransplantation . In the study by Coen et al., PTX was performed for intractable pruritus, persistent hypercalcemia and in one case for generalized bone pain .
Overall, within the baseline heterogeneity, a trend towards an improvement in BP control was observed in most case series: 6/8 papers (Table 3). Furthermore, in the case report a sharp reduction in blood pressure was recorded in the three cases described .
Our evaluation of the effect on blood pressure was limited by the lack of clear information on anti-hypertensive agents, which have probably been reduced in a relevant number of cases, as judged from the comments in the papers by Shih, Esposito and Chow (Table 3).
The case described has features that make it an interesting example of the complex relationship between severe hyperparathyroidism and hypertension.
The patient is young and has a non-immunologic disease. His compliance with drug therapy was poor, while his compliance with dialysis treatment was excellent. Tests for the cause of a so far uncharacterized interstitial disease identified no immunologic interference. His lack of compliance with chronic treatments allowed us to observe the effect of the metabolic derangements and of their correction on his blood pressure pattern without the interference of pharmacologic treatment and his good compliance with dialysis enabled us to analyze the effect of PTX without the interference of a low dialysis dose.
The prompt, complete and long-lasting normalization of blood pressure was unexpected, and this led us to review the current literature, so that we could contextualize our case and reflect on whether and how this positive effect of treatment could be expected in similar situations.
The relationship between hyperparathyroidism and hypertension in dialysis patients was reported in the 1980s and 1990s, albeit with conflicting results: Ifudu showed that in hypertensive dialysis patients PTX failed to correct hypertension, suggesting a minor effect of PTH in dialysis hypertension at least in relation to volume overload . Zucchelli obtained similar results, inferring that very high plasma PTH was not associated with cardiovascular impairment . Instead, although Goldsmith did not find a clear relationship between a PTH decrease after PTX and any immediate measure of BP, the study provided evidence for a long-term antihypertensive effect, progressively developing over 3–6 months . The authors hypothesized a “resetting” of intracellular calcium, or slow removal of calcium from the blood vessel walls. Along similar lines, Pizzarelli proposed that a BP decrease post-PTX is related to calcium efflux from the vessel walls .
Recent data confirm the pathogenic effect of hyperparathyroidism, elucidating the molecular effects and clearly indicating that vascular stiffness is not only mediated by calcium and phosphate accumulation, but also by PTH itself, via PTH2 receptors [25–27]. Elevated PTH levels can increase production of collagen by vascular smooth muscle cells and directly affect cardiac function, reducing contractility and inducing ventricular hypertrophy [28, 29]. These changes are at least partially reversible, since PTX improves arterial stiffness, and has been associated with longer patient survival, provided that calcium concentrations are normalised [22, 23, 25–30].
Unlike the elegant pathophysiologic studies, the recent data on blood pressure before and after PTX, which we gathered for our systematic review and meta-analysis, are highly heterogeneous and their interpretation is biased by a lack of precise information on concomitant drug therapy.
However, the limited information available in most of the papers retrieved suggests that the positive effect on BP was recorded in the setting of equal or reduced anti-hypertensive doses, thus further underlining the clinical relevance of BP decrease after PTX [8–13, 15].
In this context, within all the limits mentioned above, our meta-analysis allowed us to quantify the BP difference, which was higher for systolic BP (8.49 (CI 2.21–14.58) mmHg), in keeping with a reduction in vascular stiffness, and was significant, but of a lesser entity, for diastolic BP (4.14 (CI 1.45–6.84) mmHg).
It is noteworthy that, in the only case report we were able to retrieve, the differences were more important and were abrupt, and the three cases described suggest that patients may actually shift from severe hypertension to symptomatic hypotension after PTX . A similar, but less extreme pattern was observed in our case, in which the patient’s young age and short dialysis follow-up may have made possible preservation of vascular reactivity. In fact, the outcome was fully positive, and the patient was simultaneously cured of two severe cardiovascular risk factors (hyperparathyroidism and hypertension). In keeping with the series mentioned above, our case suggests considering the possibility that PTX may rapidly reset BP control, at least in some patients (Table 1) .
Our review of the literature, within the limit of heterogeneity and of limited quality, suggests that PTX exerts a beneficial effect on blood pressure, leading to a significant decrease in both systolic and diastolic BP; the higher effect on systolic BP suggests a beneficial reduction of vascular stiffness. The results are however biased by the lack of information on drug therapy, an issue that should be addressed in future prospective studies.
Our case, like the ones of three other patients reported in the literature, serves as a reminder that the effect on blood pressure is highly unpredictable. Full correction may occur, as it did in our patient, but even symptomatic hypotension sometimes, albeit rarely, has been found in patients after PTX. Further prospective studies are needed that better quantify the entity of the changes, the risk of extreme BP reduction and interference with pharmacologic treatment, to enable us to make use of these findings in our clinical judgments and counseling.
To Susan Finnel for her careful language correction.
ACS followed the patient and wrote the paper together with GPB; ACS, GBP and GS took care of paper selection for the systematic review; IK did meta-analysis and reviewed the tables, the CB took care of the imagery and of the figures, JPC followed the patient, and participated to the manuscript draft. All authors approved the case report in its present form.
Availability of data and materials
Further clinical data and images to support this case are available from the corresponding author upon reasonable request.
None of the Authors has any competing interest regarding the treated issue. At the time of publication, GB Piccoli is a Section Editor of BMC Nephrology.
Ethics approval and consent to participate
No ethics committee is needed for this case report.
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Consent to publish potentially-identifying information was obtained in written form from the patient. A copy of the consent form can be obtained from the Editor of the journal upon reasonable request.
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