Kidney dysfunction following adrenalectomy in autosomal dominant polycystic kidney disease complicated with primary aldosteronism: A case report

  • Authors:
    • Hiroyuki Hirai
    • Makoto Kanno
    • Tsuyoshi Watanabe
    • Hiroaki Satoh
  • View Affiliations

  • Published online on: June 13, 2017     https://doi.org/10.3892/etm.2017.4588
  • Pages: 1235-1240
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Abstract

The present study reported a case of autosomal dominant polycystic kidney disease complicated with primary aldosteronism in a 49‑year‑old woman. The patient was referred for refractory hypertension. Laboratory examinations revealed low potassium and renin levels. Computed tomography indicated a right adrenal tumor and multiple renal cysts. Adrenal vein sampling revealed a high aldosterone level on the side of the tumor. The patient was diagnosed with autosomal dominant polycystic kidney disease complicated by primary aldosteronism and adrenalectomy was performed. Over the following 7 months, the estimated glomerular filtration rate decreased from 76 to 48 ml/min/1.73 m2, which was attributed to glomerular hyperfiltration correction induced by hyperaldosteronism remission, indicating kidney dysfunction. Clinicians must therefore monitor for the unmasking of kidney dysfunction following adrenalectomy in such cases.

Introduction

Autosomal dominant polycystic kidney disease (ADPKD) is a hereditary kidney disease with a poor renal outcome. Pathogenesis involves cyst formation and growth, which leads to an increase in kidney volume and a decline in glomerular filtration rate (1). Approximately 50% of ADPKD patients finally need renal replacement therapy (1). In addition, ADPKD is sometimes complicated with hypertension (1).

Epidemiologically, recent prevalence of ADPKD in Japan remains unclear. However, Higashihara et al (2) reported a prevalence of ADPKD of 117 in 1,000,000 in Japan at the end of 1994. In Western countries, ADPKD affects both sexes and all ethnicities, with an estimated frequency of between 1 in 400 to 1 in 1,000 live births (1).

Primary aldosteronism (PA) is an endocrine disease that causes secondary hypertension and increases the risk of cardiovascular disease. Among cases of hypertension, Utsumi et al (3) reported that 6–11% are secondary to PA, although prevalence varies worldwide. The pathogenesis of PA is excess secretion of aldosterone from bilateral or unilateral adrenal gland or tumors (3). The early discovery and treatment of PA is a crucial clinical issue to prevent progression of atherosclerosis. The classical symptoms of PA are refractory hypertension and hypokalemia. However, those symptoms do not always occur, which makes early discovery difficult (3). Adrenalectomy is widely performed to treat adrenal tumors; however, there is increasing focus on attenuating the progression of renal dysfunction following adrenalectomy to treat PA (35), the mechanism of which has not been fully elucidated.

The primary aims of treating ADPKD and PA are controlling hypertension and preserving kidney function. However, only a few cases of the two diseases occurring together have been reported (6,7). These reports have focused on diagnosing these disorders, however to the best of our knowledge, the effect of adrenalectomy on renal function in patients with ADPKD and PA has not been fully elucidated.

The present report documents the case of a patient with ADPKD who experienced a decline in estimated glomerular filtration rate (eGFR) following adrenalectomy to treat PA.

Case report

In July 2010, a 49-year-old woman was referred to the Department of Nephrology, Hypertension, Diabetology, Endocrinology, and Metabolism, Fukushima Medical University Hospital (Fukushima, Japan) for evaluation of poorly controlled hypertension. The patient had a 9-year history of hypertension. Hypertension was defined as systolic blood pressure >140 mmHg or diastolic blood pressure >90 mmHg in a sitting position. In the preceding 3 years, the patient had undergone treatment with nifedipine (40 mg/day), imidapril (5 mg/day), and bisoprolol (5 mg/day). The patient's resting blood pressure at home had been 120–140/70–80 mmHg (normal range: Systolic blood pressure <135 mmHg and diastolic blood pressure <85 mmHg). The patient's measured period of blood pressure was ~3 years.

However, 2 months before referral, the patient's blood pressure increased to 160–170/80–90 mmHg. Upon admittance, the patient underwent a physical examination that revealed a height of 156.5 cm; a weight of 71.2 kg; a body mass index of 29.1 kg/m2; a temperature of 36.4°C; a resting blood pressure of 157/83 mmHg and a regular pulse of 50 beats/min. Fundus examination revealed hypertensive changes (H3S2 in the left eye and H2S2 in the right eye by Scheie's classification) (8). Therefore, the patient had at least moderate hypertensive and atherogenic fundus changes. The patient's family history was significant, due to the patient's mother having polycystic kidney disease. Laboratory examinations revealed hypokalemia and anemia due to iron deficiency (Table I).

Table I.

Laboratory data on first visit.

Table I.

Laboratory data on first visit.

ParameterResultNormal range
WBC (cells/µl)6,0002,800–8,800
RBC (cells ×104/µl)389366–478
Hb (g/dl)6.911.6–14.0
Hct (%)25.134.1–41.7
Plt (Plt ×104/µl)26.314.7–34.1
MCV (fl)64.581.8–97.2
MCH (%)17.727.1–33.5
TP (g/dl)7.26.7–8.3
Alb (g/dl)4.13.9–4.9
AST (IU/l)1413–33
ALT (IU/l)106–27
γGT (IU/l)1710–47
T-Bil (mg/dl)1.00.2–1.2
CRP (mg/dl)0.670–0.3
Fe (µg/dl)1343–172
UIBC (µg/dl)336137–325
Ferritin (ng/ml)812–60
FPG (mg/dl)9870–109
Na (mEq/l)143138–146
K (mEq/l)2.43.6–4.9
Cl (mEq/l)9899–109
BUN (mg/dl)78–22
Cre (mg/dl)0.510.4–0.7
eGFR (ml/min/1.73 m2)143≥60
UA (mg/dl)6.12.3–7.0
U-Glucose(−)(−)
U-Protein(1+)(−)
U-Blood(−)(−)
U-Na (mEq/l)940–90
U-K (mEq/l)2420–60
U-Cl (mEq/l)22740–120
U-Cre (mg/dl)9870–109
PRA (ng/ml/h)≤0.10.1–0.3
Aldosterone (pg/ml)14929.9–159

[i] WBC, white blood cells; RBC, red blood cells; Hb, hemoglobin; Hct, hematocrit; Plt, platelets; MCV, mean corpuscular volume; MCH, mean corpuscular hemoglobin; TP, total protein; Alb, albumin; AST, aspartate aminotransferase; ALT, alanine aminotransferase; γ-GTP, γ-glutamyl transpeptidase; T-Bil, total bilirubin; CRP, C-reactive protein; UIBC, unsaturated iron binding capacity; FPG, fasting plasma glucose; BUN, blood urea nitrogen; Na, sodium; K, potassium; Cl, chloride; Cre, creatinine; eGFR, estimated glemerular filtration rate, calculated as 194xCr-1.094xage-0.287×0.739; UA, uric acid; PRA, plasma renin activity.

Plasma renin activity (PRA) was ≤0.1 ng/ml/h (normal range, 0.1–0.3 ng/ml/h), thus bisoprolol was discontinued to exclude a false low result. Oral iron supplements (100 mg/day) were administered, resulting in gradual improvement of anemia. Thereafter, a captopril (50 mg) stimulation test was conducted producing a low renin response (Table II; normal range, renin response >1.0 ng/ml/h, aldosterone-to-renin ratio (ARR) of 60 or 90 min <200). Abdominal computed tomography and magnetic resonance imaging revealed a right adrenal tumor ~1.0 cm in size and multiple cysts in the liver and kidneys (Fig. 1). The estimated volume of the bilateral kidneys was calculated using the volumetric method and the following formula: Volume = π/6x length × width × depth (9,10) and was determined to be ~705.4 ml.

Table II.

Captopril stimulation test.

Table II.

Captopril stimulation test.

Time (min)

Parameter06090Normal range
Renin (ng/ml/h)0.30.30.30.1–0.3
Aldosterone (pg/ml)12919422829.9–159
Aldosterone/renin ratio430646.7760≤200

To evaluate the adrenal tumor further, adrenal vein sampling was conducted. A catheter was inserted into the bilateral adrenal vein via the femoral vein. Blood samples were collected from the inferior vena cava, left adrenal vein and right adrenal vein. A 0.25 mg dose of tetracosactide acetate (adrenocorticotripic hormone; Daiichi Sankyo Co., Ltd., Tokyo, Japan) was administered intravenously, and after 30 min, blood samples were collected from the same locations again. The serum aldosterone level was high on the side of the tumor (Table III). The patient's results fulfilled the diagnostic criteria for ADPKD (11) and PA (12,13).

Table III.

Adrenal vein sampling.

Table III.

Adrenal vein sampling.

VeinAldosterone (pg/ml)Cortisol (µg/dl) Aldosterone/cortisol
Inferior vena cava66.14.016.5
Left adrenal vein88.313.96.4
Right adrenal vein2,01015.5129.7
Inferior vena cavaa   2601517.3
Left adrenal veina2,1006303.3
Right adrenal veina67,3001,10061.2

a Following injection of tetracosactide acetate (ACTH 1–24, 0.25 mg)

Eplerenone (selective aldosterone antagonist; Pfizer Japan, Inc., Tokyo, Japan) was administered, beginning at 50 mg/day (once after breakfast) for 15 days, thereafter, 75 mg/day (once after breakfast) for 30 days and finally increasing to 100 mg/day (50 mg twice a day, after breakfast and dinner) for ~15 weeks, until adrenalectomy. This resulted in a reduction of blood pressure to ~130/80 mmHg, which was within normal blood pressure range of <135/85 mmHg. In April 2011, right adrenalectomy was successfully performed. Hemodynamic disturbances during the surgery or in the immediate post-surgical course were not evident. Weiss criteria (14,15) were used to distinguish between adrenal adenoma or malignant tumor. For pathological evaluation, the specimen was fixed with 10% formalin fixation for 3 days at room temperature. The thickness of sections was approximately 5 µm. The paraffin embedded tissue sections were de-paraffinized by xylene, and then stained with hematoxylin-eosin. Sections were examined under an Olympus BX51 microscope at magnification ×200. Pathologically, there were no evidence of necrosis, mitosis or atypical mitosis. From the above pathological findings, the tumor was diagnosed as adenoma.

Postoperatively, potassium levels normalized. However, kidney function worsened following adrenalectomy, despite good control of her hypertension. Fig. 2 summarizes the clinical course of the patient over ~5 years. The eGFR (calculated as 194x creatinine−1.094x age−0.287x0.739) (16) decreased by 36.8% over the 7 months immediately following adrenalectomy, from 76 to 48 ml/min/1.73 m2 (normal range, >90 ml/min/1.73 m2). The serum creatinine level increased from 0.64 to 0.97 mg/dl. Home blood pressure measurements during this time remained 110–120/60–80 mmHg.

After the initial decline in eGFR over the 7 months following adrenalectomy, it stabilized to some extent, with a much slower rate of decline (Fig. 2), suggesting that this was the natural level of the patient's renal function due to ADPKD. Follow-up abdominal computed tomography ~9 months after surgery indicated no marked changes in the renal cysts. The estimated bilateral kidney volume was ~707.7 ml; virtually unchanged from the first examination. The patient continued to take 4 mg/day candesartan (angiotensin II receptor antagonist; Takeda Pharmaceutical Co., Ltd., Osaka, Japan), once after breakfast, which effectively controlled blood pressure.

Discussion

The present report highlights three important issues. Firstly, PA may co-exist with ADPKD. Secondly, as in this case, PA might mask ADPKD kidney dysfunction, which only manifests following adrenalectomy. Therefore, clinicians should remain vigilant for the unmasking of kidney dysfunction following adrenalectomy in patients with ADPKD. Finally, following adrenalectomy, it appears that renal function may decrease to levels expected over the natural clinical course of ADPKD.

ADPKD is attributed to mutations in the PKD1 or PKD2 genes (17) that produce the polycystin-1 and polycystin-2 proteins, respectively. Loss of function of either protein ultimately results in the formation of cysts in the kidney. Growth and expansion of cysts is a critical factor in progressive ADPKD. In individuals harboring a mutation, cysts are almost always detectable by early adulthood (18). The cysts are thought to induce focal areas of renal ischemia and enhanced renin release, increasing renin-aldosterone system activity, with the result that extracellular volume expansion is often present in the early stages of ADPKD (19). It is not unusual for young adults with ADPKD to exhibit hypertension before they experience evident renal dysfunction (20,21). The mechanism of hypertension in ADPKD is thought to be complex. A number of potential factors have been proposed, including the renin-aldosterone system, endothelial dysfunction, increased sympathetic activity, increased endothelin-l levels and arterial stiffness (22).

However, the role of the renin-aldosterone system in ADPKD is considered to be particularly important (1). One of the reasons is that hyperaldosteronism may not only to increase cardiovascular risk and secondary hypertension but may also to contribute to the growth of cysts, with hypokalemia implicated as a direct growth factor for cysts (22). Therefore, the early diagnosis and correction of underlying PA is critical in patients with ADPKD. However, as ADPKD is often complicated by hypertension in the early stages, the coexistence of PA may not be considered. In this regard, Kao et al (7) reported that hypokalemia is an important feature that may enable the diagnosis of the co-occurrence of ADPKD and PA. In addition, a high aldosterone-renin ratio (ARR) may be a useful diagnostic tool because as in PA cases, if the only symptom is hypertension, early discovery of ADPKD and PA co-occurrence is difficult. In the present case report, hypokalemia and a high ARR were present initially (K, 2.4 mEq/l; PRA, ≤0.1 ng/ml/h and aldosterone, 149 pg/ml), suggesting that the patient had PA.

So far, there have been 12 reported cases of combined ADPKD and PA (6,7,2327). Adrenalectomies were performed in 8 patients (6,7,2326) and anti-aldosterone drugs were administered to the other 4 cases (22,23,27). Worsening of kidney function following adrenalectomy for PA has been reported (23); the cause may be the correction of glomerular hyperfiltration once aldosterone levels have been stabilized (35). Therefore, overestimated kidney function due to glomerular hyperfiltration was canceled out, which led to an accurate kidney function. As a result, decline of eGFR may have occurred. Hyperaldosteronism leads to sodium and water retention, for which the kidney may compensate with hyperfiltration to excrete the excess sodium and water. Following adrenalectomy, normalization of aldosterone levels results in the return of filtration to normal levels. Kidney dysfunction that was previously masked by aldosterone-related hyperfiltration may then be revealed (35).

There is controversy regarding the length of time take for eGFR to return to normal levels following adrenalectomy. According to some reports, eGFR decreases following adrenalectomy for ~1 month, after which it stabilizes, presumably indicating underlying levels of renal function (35). However, other authors have reported more variable rates of decline in eGFR following adrenalectomy. Utsumi et al (3) reviewed the records of 78 Japanese patients who underwent unilateral adrenalectomy to treat PA. The eGFR decreased by 16.6–13.2 ml/min/1.73 m2 (16.3–13.0%) in patients with a preoperative eGFR ≥90 ml/min/1.73 m2 (n=20); by 11.1–10.6 ml/min/1.73 m2 (14.7–14.4%) in those with initial values of 60–89 ml/min/1.73 m2 (n=46); and by 4.8–8.7 ml/min/1.73 m2 (10.6–18.8%) in those with a preoperative eGFR <60 ml/min/1.73 m2 (n=12). These values were all measured within 1 month postoperation. The differences between pre- and postoperative values in the three groups were statistically significant (3). In the current case report, the rate and duration of the decline of eGFR following adrenalectomy likely differed from that observed in patients with PA alone. What is notable in the current case is that the kidney volume remained essentially unchanged pre- and postoperatively and blood pressure remained well controlled post-surgery. Therefore, a rapid postoperative decline in eGFR was most likely due to correction of hyperaldosteronism.

According to the Consortium for Radiologic Imaging Studies of Polycystic Kidney Disease (CRISP) dataset (www.niddkrepository.org/studies/crisp), Chapman et al (28) reported that eGFR could be calculated as follows: (y=−0.0136 x+112.63, R=−0.37), (y=eGFR, ml/min/1.73 m2, × = the volume of kidney, ml). If the current case is applied, the volume of each kidney was 705.4 ml and eGFR is calculated as 103.04 ml/min/1.73 m2. Therefore, the unmasked level of kidney dysfunction in the current case may be more severe at the given level of total kidney volume. The reasons for the poor kidney function of the patient cannot be determined with certainty. One potential explanation is the coexistence of progressive ADPKD masked by hyperfiltration, as well as a history of long-term hypertension. Although predicting a decrease in eGFR in patients with PA following adrenalectomy is difficult, it is a critical clinical issue. Tanase-Nakao et al (5) reported that a preoperative eGFR ≤76.9 and ARR ≥305 were significant predictive factors for postoperative chronic kidney disease in patients with PA. In the current case, preoperative eGFR and ARR almost fulfilled those criteria, although it is unclear if other patients similar to ours would also have similar results. Identifying similar such cases is required to clarify this issue. It was also observed that the patient's eGFR stabilized ~7 months following adrenalectomy and exhibited only a slow decline thereafter, indicating that eGFR is associated with the natural clinical course of ADPKD. Torres and Harris (29) reported that, once renal dysfunction appears in ADPKD, there is a decline in eGFR of ~5 ml/min/year. Given the age of the patient, this rate of decline is not inconsistent with eGFR values immediately following postoperative decline.

The patient's blood pressure was well controlled following adrenalectomy. However, the target for blood pressure control in patients with ADPKD remains controversial. Sarnak et al (30) reported that low targets for blood pressure slowed the progression of nondiabetic kidney disease in patients with moderately-to-severely decreased GFRs and recommended a target of <130/80 mmHg (28). In this regard, the recent HALT-PKD [Study A] (31) determined that in early ADPKD, strict blood pressure control (i.e., blood pressure <110/75 mm Hg) was associated with better outcomes, including a slower increase in total kidney volume, decrease in left-ventricular-mass index and proteinuria, compared with standard blood pressure control, although there was no difference in the eGFR. In the current case report, proteinuria was only detected on the first visit and microalbuminuria was undetectable thereafter.

In conclusion, the current study reports the case of a patient with ADPKD whose kidney dysfunction was masked until adrenalectomy for PA caused by adrenal adenoma. This case suggests that, when patients undergo adrenalectomy to treat PA, the clinician must be vigilant for a postoperative decline in eGFR, particularly in patients with possible underlying renal disease.

Acknowledgements

The authors would like to thank Dr Osamu Suzuki for advising on pathological methods. This study was supported in part by a Grant-in-Aid for Scientific Research (C) from the Ministry of Education, Culture, Sports, Science and Technology of Japan (grant no. 16K09363) awarded to Dr Hiroaki Satoh.

Glossary

Abbreviations

Abbreviations:

ADPKD

autosomal dominant polycystic kidney disease

PA

primary aldosteronism

eGFR

estimated glomerular filtration rate

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Hirai H, Kanno M, Watanabe T and Satoh H: Kidney dysfunction following adrenalectomy in autosomal dominant polycystic kidney disease complicated with primary aldosteronism: A case report. Exp Ther Med 14: 1235-1240, 2017.
APA
Hirai, H., Kanno, M., Watanabe, T., & Satoh, H. (2017). Kidney dysfunction following adrenalectomy in autosomal dominant polycystic kidney disease complicated with primary aldosteronism: A case report. Experimental and Therapeutic Medicine, 14, 1235-1240. https://doi.org/10.3892/etm.2017.4588
MLA
Hirai, H., Kanno, M., Watanabe, T., Satoh, H."Kidney dysfunction following adrenalectomy in autosomal dominant polycystic kidney disease complicated with primary aldosteronism: A case report". Experimental and Therapeutic Medicine 14.2 (2017): 1235-1240.
Chicago
Hirai, H., Kanno, M., Watanabe, T., Satoh, H."Kidney dysfunction following adrenalectomy in autosomal dominant polycystic kidney disease complicated with primary aldosteronism: A case report". Experimental and Therapeutic Medicine 14, no. 2 (2017): 1235-1240. https://doi.org/10.3892/etm.2017.4588