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Echocardiographic characteristics of patients with acute heart failure requiring tolvaptan: a retrospective study



No study has investigated the admission echocardiographic characteristics of acute heart failure (AHF) patients who are resistant to conventional diuretics and require tolvaptan.


We retrospectively analyzed the echocardiographic characteristics of AHF patients who were resistant to conventional diuretics and took tolvaptan (tolvaptan group: 26 patients), and compared them to those who were sensitive to conventional diuretics (conventional group: 180 patients).


The tolvaptan group had a higher left atrial volume index (96.0 ± 85.0 mL/m2 vs. 45.8 ± 25.9 mL/m2, p < 0.0001), maximum inferior vena cava diameter (20.7 ± 6.9 mm vs. 18.1 ± 4.2 mm, p < 0.01), and higher tricuspid regurgitation grade (1.1 ± 0.8 vs. 0.8 ± 0.6, p < 0.05) than the conventional group. However, the left ventricular ejection fraction and end diastolic diameter were similar between the groups. Responders of tolvaptan had no significant echocardiographic differences compared to the non-responders.


The admission echocardiographic characteristics of AHF patients requiring tolvaptan included a larger left atrium, inferior vena cava, and more severe tricuspid regurgitation. Echocardiography may provide useful information for the early and appropriate initiation of tolvaptan.

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The regulation of cardiac volume and pressure overload is one of the most important therapeutic strategies for acute heart failure (AHF) [1, 2]. Cardiac volume overload can be ameliorated by the appropriate restriction of sodium and water intake and conventional diuretics such as loop diuretics in many patients with AHF; however, it is difficult to be ameliorated in some patients, because conventional diuretics are less effective or cannot be administered in sufficient doses due to worsening renal function and electrolyte imbalances [3].

Tolvaptan (Otsuka Pharmaceutical Co., Ltd., Tokyo, Japan) is an oral selective vasopressin type 2 receptor antagonist that promotes water excretion without changing the renal sodium and potassium excretion [4]. Large clinical studies have shown that tolvaptan can rapidly improve the congestive symptoms of AHF and reduce body weight without serious adverse events [5, 6]. Tolvaptan improves the long-term prognosis, especially in AHF patients with severe hyponatremia [7]; moreover, even with normonatremia, the selection of low-dose tolvaptan can improve congestive symptoms without causing hypernatremia [8]. Tolvaptan is expected to be widely used in patients with AHF.

Yet, the following two problems remain unresolved. First, the decision to initiate tolvaptan is difficult immediately after admission. In Japan, tolvaptan is indicated for the treatment of volume overload in AHF patients who are resistant to conventional diuretics, and it should not be administered in all AHF patients because of the heavy economic burden to patients and society. However, tolvaptan is difficult to administer to only patients who are accurately identified as being resistant to conventional diuretics immediately after admission. Even if resistance is suspected, an increase in the dose will be attempted in many patients [9], without initiating tolvaptan. We consider that some patients with AHF cannot possibly obtain sufficient clinical benefits from tolvaptan because of a delayed decision. Second, the early prediction of responsiveness to tolvaptan is difficult.

The purposes of this study were (1) to determine the admission echocardiographic characteristics of AHF patients who are resistant to conventional diuretics and thus require tolvaptan by comparing them to those who are sensitive to conventional diuretics; and (2) to investigate the admission echocardiographic differences between responders and non-responders of tolvaptan. We consider that these echocardiographic indices will be useful for the early and appropriate initiation of tolvaptan.


Study patients

From April 2011 to December 2013, there were 328 patients hospitalized in our department who were diagnosed with AHF according to the Framingham criteria, and they were prospectively registered in our database [10, 11]. We collected the clinical data of AHF patients who were resistant to conventional diuretic therapy and thus took tolvaptan orally (tolvaptan group) and that of those who were sensitive to conventional diuretic therapy (conventional group). Tolvaptan treatment was initiated by the attending doctors’ decision, which was in accordance with the health insurance treatment of Japan. Conventional diuretic therapy was defined as the combination of diuretics excluding tolvaptan, beta-blockers, renin-angiotensin system inhibitors (e.g., angiotensin-converting enzyme inhibitors or angiotensin II receptor blockers), vasodilators, or inotropic agents (e.g., digoxin, dobutamine, and phosphodiesterase-III inhibitors). The exclusion criteria were as follows: (1) transthoracic echocardiography was not performed within 48 h after admission in the central physiological laboratory; (2) the echocardiography had poor image quality and insufficient data; (3) coronary revascularization, such as coronary artery bypass grafting and percutaneous coronary intervention, and devise therapy, such as pacemakers, implantable cardioverter-defibrillators, and cardiac resynchronization therapy were considered to be significantly effective for improving the congestive symptoms of AHF or these were performed during hospitalization; and (4) patients with acute coronary syndrome, acute myocarditis, or acute pulmonary embolism. Thus, we analyzed 206 patients with AHF. The present study was approved by the Nara Medical University Institutional Ethics Committee and was performed under the clinical research protocols in accordance with the 1975 Declaration of Helsinki.

Clinical characteristics

The following clinical data were collected on admission: age, sex, body mass index (BMI), etiology of heart failure, presence of hypertension, diabetes mellitus, dyslipidemia, heart rate, and blood pressure and laboratory data. Hypertension was defined as the current use of an anti-hypertensive drug for the treatment of blood pressure (BP) elevation (systolic BP, ≥140 mmHg; diastolic BP, ≥90 mmHg). Diabetes mellitus was defined as undergoing current treatment with hypoglycemic agents, a non-fasting blood glucose level of ≥200 mg/dL, or a fasting blood glucose level of ≥126 mg/dL. Dyslipidemia was defined as the current use of a statin or fibrate, a low-density lipoprotein cholesterol level of ≥140 mg/dL, a high-density lipoprotein cholesterol level of <40 mg/dL, or a triglyceride level of ≥150 mg/dL. The estimated glomerular filtration rate (eGFR) was calculated according to the published equation for Japanese persons: 194 × serum creatinine −1.094 × age−0.287 × (0.739 for females) [12].


Ultrasound examinations were performed using the Sonos 7500 systems (Philips, Best, the Netherlands) and Acuson Sequoia systems (Siemens, Erlangen, Germany). Left ventricular ejection fraction (LVEF) and end-diastolic volume (LVEDV) were calculated by using the modified Simpson’s method. The left atrial (LA) volume was calculated using the biplane area-length technique. The LV end-diastolic diameter (LVDd), LV end-systolic diameter (LVDs), septal wall thickness (SWT), posterior wall thickness (PWT), and LA diameter were measured using M-mode echocardiography [13]. Diastolic function was assessed using transmitral and tissue Doppler imaging at the septal mitral annulus. Peak early (E) and late transmitral filling velocities (A), their ratio, the deceleration time of peak E velocity, early diastolic mitral annular velocity (e’), and E/e’ were measured. Subjects were classified into the following four groups according to the Recommendations for the Evaluation of Left Ventricular Diastolic Function by the American Society of Echocardiography: normal, mild, moderate, and severe [14]. The severity of valvular regurgitation was quantitatively evaluated with Doppler color flow imaging, in which the vena contracta width was measured at the narrowest portion of the regurgitant jet [15]. Aortic and mitral regurgitation was graded on a 4-point scale: none or trivial (score 0), mild (score 1), moderate (score 2), or severe (score 3). Tricuspid regurgitation was graded on a 3-point scale: none or trivial (score 0), mild or moderate (score 1), or severe (score 2). The inferior vena cava (IVC) diameter was measured, and the collapsibility index was calculated as a percentage of the difference between the maximal and minimal diameter [16].


We defined patients who responded to tolvaptan (responders) as those with a ≥50 % increase in the maximum 24-h urine volume within 3 days after administration compared to before administration. Non-responders were those with a <50 % increase according to the report by Sakaguchi et al. [17].

Statistical analysis

Data are presented as a mean ± standard deviation. The chi-square or Fisher’s exact tests were used to analyze univariate associations between the categorical variables, and the Mann–Whitney U test was used for the continuous variables. We used JMP software (SAS Institute, Cary, NC, USA) to analyze the data. P values <0.05 were considered statistically significant.


Clinical characteristics

The tolvaptan and conventional groups consisted of 26 and 180 AHF patients, respectively (Fig. 1). The tolvaptan group included 16 patients who were admitted for scheduled initiation because of ≥2 prior hospitalizations, 8 who were treated by tolvaptan after ≥3 days of conventional therapy, and 2 who had severe weight gain (7 kg and 16 kg) due to fluid retention.

Fig. 1
figure 1


Tolvaptan was administered at a mean initial dose of 8.2 ± 3.7 mg/day. The clinical characteristics on admission are shown in Table 1. There were no significant differences in age, sex, BMI, etiology of heart failure, or comorbid diseases excluding atrial fibrillation between the groups. Previous AHF hospitalization (2.1 ± 1.7 times vs. 0.5 ± 0.9 times, p < 0.001) and atrial fibrillation (73 % vs. 38 %, p < 0.001) were significantly more common in the tolvaptan group than the conventional group. The tolvaptan group had a significantly lower heart rate (79 ± 18 bpm vs. 96 ± 27 bpm, p < 0.001), systolic blood pressure (123 ± 27 mmHg vs. 150 ± 38 mmHg, p < 0.001), diastolic blood pressure (71 ± 17 mmHg vs. 84 ± 22 mmHg, p < 0.01), and hemoglobin (10.3 ± 2.1 g/dL vs. 11.5 ± 2.3 g/dL, p < 0.05). The eGFR was significantly lower (30.7 ± 17.6 mL/min/1.73 m2 vs. 50.1 ± 27.3 mL/min/1.73 m2, p < 0.001) and severe renal dysfunction (eGFR <30 mL/min/1.73 m2) was more commonly observed in the tolvaptan group than in the conventional group (58 % vs. 26 %, p < 0.005). There were no differences in the concentration of sodium, potassium, and B-type natriuretic peptide (BNP) between the groups. The administration of β-blockers (69 % vs. 33 %, p < 0.001), renin-angiotensin system inhibitors (77 % vs. 54 %, p < 0.05), loop diuretics (100 % vs. 51 %, p < 0.001), thiazide diuretics (26 % vs. 9 %, p < 0.005), and aldosterone blockers (54 % vs. 18 %, p < 0.05) was significantly more common in the tolvaptan group than in the conventional group.

Table 1 Clinical characteristics


The echocardiographic parameters are summarized in Table 2. There were no significant differences in the LVEF, LVEDV index, LVDd, LVDs, SWT, and PWT between the groups. However, the LA diameter (53.4 ± 9.9 mm vs. 47.1 ± 8.5 mm, p < 0.001) and volume index (96.0 ± 85.0 mL/m2 vs. 45.8 ± 25.9 mL/m2, p < 0.0001) were significantly larger in the tolvaptan group than in the conventional group. In the tolvaptan group, the maximum IVC diameter was significantly larger (20.7 ± 6.9 mm vs. 18.1 ± 4.2 mm, p < 0.01), and the collapsibility index was significantly lower (0.35 ± 0.16 vs. 0.46 ± 0.15, p < 0.001). While there was no significant difference in the severity score and vena contracta width of aortic and mitral regurgitation between the groups, tricuspid regurgitation was significantly more severe in the tolvaptan group than in the conventional group (severity score: 1.1 ± 0.8 vs. 0.8 ± 0.6, p < 0.05; vena contracta width: 5.8 ± 5.1 mm vs. 3.6 ± 3.2 mm, p < 0.005). Evaluating diastolic function was difficult in patients with atrial fibrillation; thus, it could only be evaluated in 7 patients of the tolvaptan group and in 111 patients of the conventional group. The tolvaptan group tended to have more severe diastolic dysfunction than the conventional group. The tricuspid regurgitation pressure gradient (TRPG) was measured in all patients of the tolvaptan group; however, it could only be measured in 162 patients of the conventional group with TR. The TRPG was similar between the groups (40.7 ± 13.0 mmHg vs. 42.3 ± 16.2 mmHg, p = 0.63).

Table 2 Echocardiographic data

Prediction of responsiveness to tolvaptan

In the tolvaptan group, there were 13 responders and 13 non-responders. Their clinical and echocardiographic characteristics on admission are shown in Tables 3, 4 and 5. BNP tended to be lower in the responders than in the non-responders (475 pg/mL vs. 917 pg/mL, p = 0.07). In limited patients who had no renin-angiotensin system inhibitors, the diastolic blood pressure was significantly higher in the responders than in the non-responders (77 ± 9 mmHg vs. 54 ± 5 mmHg, p < 0.05). There were no significant echocardiographic differences between the groups.

Table 3 Clinical characteristics in responder and non-responder
Table 4 Effects of antihypertensive agents on heart rate and blood pressure in responder and non-responder
Table 5 Echocardiographic data in responder and non-responder


This is the first study to report on the admission echocardiographic characteristics of AHF patients who are resistant to conventional diuretics and thus require tolvaptan, and we compared these patients with those who are sensitive to conventional diuretics. The characteristics included a larger LA and IVC and more severe TR.

The reasons why AHF patients requiring tolvaptan had these echocardiographic characteristics can not be sufficiently clarified in this study. However, on the basis of several studies, we speculate that AHF patients with these characteristics frequently have elevated central and renal venous pressure, which worsens their renal function. Renal dysfunction can reduce responsiveness to loop diuretics through impaired tubular delivery due to diminished renal blood flow and reduced activity in the proximal tubular carrier system caused by competition from the accumulated organic anions [3].

The LA size reflects the LV diastolic function [18, 19]. Diastolic dysfunction can induce pulmonary hypertension through the passive transmission of elevated end diastolic pressures, reactive pulmonary vasoconstriction, and vascular remodeling [20]. Pulmonary hypertension can induce functional tricuspid regurgitation through annular dilatation and tethering of the leaflets due to right ventricular dilatation and dysfunction [21], which elevates the central and renal venous pressure. The elevated central venous pressure manifests as IVC dilatation [22].

Renal congestion as well as low cardiac output is closely related to the progression of renal dysfunction. Many clinical studies have shown that patients with heart failure and renal congestion commonly have worsening renal function independent of cardiac output [2327]. Tanaka et al. demonstrated that renal congestion contributed to worsening renal function by augmenting oxidative stress-mediated inflammation in the tubulointerstitium in a histopathological study on patients with non-ischemic heart failure and renal dysfunction [24]. A few basic studies have been reported on this relationship between renal congestion and dysfunction [28, 29]. Doty et al. demonstrated that elevating the renal venous pressure by 30 mmHg for 2 h can decrease the renal artery blood flow and glomerular filtration rate while increasing the plasma renin activity, serum aldosterone, and urinary protein leak in experimental swine models with stable cardiac index and arterial pressure [28]. To verify this, further investigations that include a combination of echocardiography and invasive hemodynamic monitoring are required.

Recently, the earlier initiation of tolvaptan has been shown to prevent the exacerbation of acute kidney injury and improve the prognosis of patients with AHF [30]. Moreover, some basic studies have shown that tolvaptan has cardio- and renal-protective effects [3135], whereas the volume reduction by loop diuretics leads to a decrease in the renal blood flow and activation of the renin-angiotensin-aldosterone and sympathetic nervous systems [36]. Morooka et al. demonstrated that tolvaptan can ameliorate glomerulosclerosis and tubulointerstitial fibrosis and improve renal dysfunction concomitantly by suppressing activated V2R, V1aR, renin, endothelin-1, aquaporin-2 in rats with hypertensive heart failure [32]. According to our clinical and echocardiographic data, patients who will obtain great benefit from tolvaptan therapy may present the following profiles in addition to the resistance to conventional diuretics: 1) left atrial dilatation, 2) severe tricuspid valve regurgitation, 3) IVC dilatation, 4) atrial fibrillation, and 5) renal dysfunction. By accurately assessing these profiles, tolvaptan can be initiated as early as possible in appropriate AHF patients, and this is considered important for achieving the maximum effects.

Non-responders to tolvaptan are observed in 18–39 % of patients with AHF [3739], and establishing a prediction method for responsiveness to tolvaptan is important for its effective use. Our study detected no significant differences between the responders and non-responders to tolvaptan, and this was probably because of the small number of subjects. However, the following prediction methods have been reported. First, a baseline urine osmolality of >352 mOsm/L that decreases >26 % between 4–6 h after administration has been noted in responders to tolvaptan [37]. Second, according to echocardiographic evaluation, the tricuspid annular plane systolic excursion and right ventricular wall strain are impaired in non-responders to tolvaptan [38]. Third, the serum concentration of blood urea nitrogen 1 day after tolvaptan initiation is significantly increased in non-responders to tolvaptan [39].

Study limitations

The present study has the following limitations. First, we retrospectively analyzed the data from a small number of subjects at a single center. Second, resistance to conventional diuretics was not defined, and a detailed standard for initiating tolvaptan was not determined. However, all patients in the tolvaptan group had other diuretics, ≥2 prior hospitalizations, ≥3 days of conventional therapy, or severe weight gain due to fluid retention. Moreover, since patients who could be treated by coronary revascularization or devise therapy were excluded from this study, we considered that they were resistant to conventional diuretics and thus required tolvaptan. Third, the diastolic function and TRPG were similar between the tolvaptan and conventional group, which may be because these indicators could not be measured in some patients. Moreover, TRPG may be poorly correlated to the severity of TR, because the modified Bernoulli equation is not exactly satisfied in patients with severe tricuspid valve regurgitation and dehiscence due to dilated annulus. Further investigations are required to overcome these limitations.

In conclusion, patients with AHF who were resistant to conventional diuretics and thus required tolvaptan had a larger LA and IVC and more severe tricuspid regurgitation according to their admission echocardiography. Therefore, echocardiography on admission may provide useful information for deciding when to initiate tolvaptan in patients with AHF.



Acute heart failure


Body mass index


Blood pressure


Estimated glomerular filtration rate


Left ventricular ejection fraction


end-diastolic volume


Left atrium


LV end-diastolic diameter


LV end-systolic diameter


Septal wall thickness


Posterior wall thickness


Peak early transmitral filling velocity


Late transmitral filling velocity


Early diastolic mitral annular velocity


Inferior vena cava


Tricuspid regurgitation pressure gradient


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Correspondence to Satoshi Okayama.

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The authors declare that they have no competing interests.

Authors’ contributions

Study concept and design: SO. Acquisition of data, analysis, and interpretation of the data: SO, YN, TN, TU, KO, and YT. Statistical analysis: SO and YN. Drafting of the manuscript: YN. Critical revision of the manuscript for important intellectual content: RK and MH. Study supervision: SU, SF, and YS. The corresponding author, SO, had full access to all the data in the study and had final responsibility for the decision to submit for publication. All authors read and approved the final manuscript.

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Nakada, Y., Okayama, S., Nakano, T. et al. Echocardiographic characteristics of patients with acute heart failure requiring tolvaptan: a retrospective study. Cardiovasc Ultrasound 13, 27 (2015).

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