Abstract
Background/Aims
Ascites is a dreadful complication of liver cirrhosis associated with short survival. Large volume paracentesis (LVP) is used to treat tense or refractory ascites. Paracentesis induced circulatory dysfunction (PICD) develops if no plasma expanders are given with ominous complications. To study the effect of ascites flow rate on PICD development.
Methods
Sixty patients with cirrhosis and tense ascites underwent LVP of 8 L were randomized into 3 equal groups of different flow rate extraction; group I (80 mL/minute), group II (180 mL/minute) and group III (270 mL/minute). Plasma renin activity (PRA) was measured baseline and on day six. PICD was defined as increase in PRA >50% of the pretreatment value.
Results
In group I through 3; the mean age was (52.5±9.4 vs. 56.4±8.5 vs. 55.8±7.1 years; P>0.05), mean arterial pressure (81.4±5.6 vs. 81.5±7 vs. 79.5±7.2 mmHg; P>0.05), MELD (17.6±4.1 vs. 15.8±4.1 vs. 14.7±4.5). Baseline PRA was comparable (1,366.0±1244.9 vs. 1,151.3±1,444.8 vs. 951.9±1,088 pg/mL; P>0.05). There was no statistically significant (P>0.05) flow mediated changes (Δ) of creatinine (0.23±0.27 vs. 0.38±0.33 vs. 0.26±0.18 mg/dL), MELD (1.25±5.72 vs. 1.70±2.18 vs. 1.45±2.21) or PRA (450.93±614.10 vs. 394.61±954.64 vs. 629.51±1,116.46 pg/mL). PICD was detected in a similar frequency in the three groups (P>0.05). On univariate logistic analysis only female sex was a fairly significant PICD predictor (Wald 3.85, odds ratio 3.14; P=0.05).
Conclusions
The ascites flow rate does not correlate with PICD development.
Keywords: Paracentesis induced circulatory dysfunction, Ascites, Large volume paracentesis, Flow rate
INTRODUCTION
Ascites is a common dreadful complication of liver cirrhosis. It is associated with poor quality of life and short survival.1,2,3 Therapeutic paracentesis can be used in patients with tense or refractory ascites.4 Large volume paracentesis (LVP) of more than 5 L is associated with paracentesis induced circulatory dysfunction (PICD) development unless plasma expanders are given.1,5,6,7 If less than 5 L of ascites are tapped, usually PICD does not occur, and thereby artificial plasma expanders, saline, and albumin are equally effective.8
PICD is characterized by reduction of effective arterial blood volume with subsequent activation of vasoconstrictor and antinatriuretic factors. Clinically it provokes rapid ascites recurrence rate, development of dilutional hyponatremia, hepatorenal syndrome with increased mortality.9
For preventing PICD development, albumin is given in a dose of 6-8 g/L ascites removed.4,5,6,7,8,9 Since costly alternatives were studied like low dose albumin (2-4 g/L),10,11 terlipressin,11,12,13,14,15 noradrenaline,15,16 midodrine,11,17,18,19 synthetic colloids,11,20,21,22,23,24,25,26 and saline.27,28 β-blockers should be avoided in patients with refractory ascites.29,30
Does the paracentesis flow rate affect the development of PICD? This was the aim of the study.
PATIENTS AND METHODS
Sixty patients with HCV related liver cirrhosis and tense ascites admitted to the National Liver Institute hospital for LVP were prospectively included in this study. After institutional review board approval, written informed consent was obtained.
Diagnosis of cirrhosis was based on clinical, laboratory, and ultrasonographic findings.31 Inclusion criteria were the presence of tense ascites determined by clinical examination and abdominal ultrasound, requiring frequent therapeutic paracentesis, age less than 70 years and older than 18 years old, and absence of arterial hypertension, history of coronary disease, cardiac failure, respiratory disease, hepatic encephalopathy, sepsis, spontaneous bacterial peritonitis (defined by polymorphonuclear cell count >250/mm3 in ascites),32 elevated creatinine concentration >1.5 mg/dL and gastrointestinal bleeding within 7 days before the study.
The patients were randomized to 3 groups namely group I (slow flow rate, n=20), group II (medium flow rate, n=20), group III (rapid flow rate, n=20).
All patients were on a low-sodium diet (34 mmol/day) for at least 7 days outpatient before inclusion in the study. Changes of the effective arterial blood volume were evaluated by measuring plasma rennin activity (PRA) at day of paracentesis (day 0; baseline) and on the day of hospital discharge (day 6).
On the day 0; a baseline workup, including body weight, blood pressure, heart rate, electrocardiogram, liver tests (bilirubin, albumin, aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase), and renal function tests (urea and creatinine), were conducted. Blood samples were collected after an overnight fast and bed rest for at least 30 minutes in the supine position for measuring PRA. Blood samples were put into chilled ethylenediaminetetraacetic acid tubes, centrifuged at 2,500 rpm for 10 min at -3℃, and stored at -20℃.
Fixed volume 8 L paracentesis was then done under local anesthesia and strict aseptic conditions,33 followed by albumin at a dose of 8 g/L ascites removed. Owing to the unavailability of the suction bottles, the ascitic fluid flowed through the cannula to sterile urine collection bag through a drip line. In group I, the flow rate was 80 mL/minute with 18 G cannula, in group II, the flow rate was 180 mL/minute with 16 G cannula, and finally in group III, the flow rate was 270 mL/minute with 14 G cannula.
From day 1 to day 5, the patients were monitored daily for body weight, daily urine output volume, blood pressure, heart rate and development of complications.
On the day of hospital discharge (day 6); blood pressure, heart rate, and weight were recorded. Electrocardiogram, renal and liver function tests were done, and blood was collected for PRA measurement.
Outcome measures
The primary end point was taken as development of PICD that was defined as an increase in PRA of >50% of the pretreatment value.9
Methods of measurement
Renin test procedure was done using ELISA [DRG® Renin ELISA (EIA-5125) Germany] on ELISA reader Multiskan FC (Cat. no. 51119000), Thermo Fisher Scientific (Finland). The procedures were done according to the manufacturer's instructions.
Liver function tests included alanine aminotransferase (ALT), aspartate aminotransferase (AST), bilirubin, albumin and kidney functions including urea and creatinine, were measured using Cobas Integra 800 Auto analyzer (Roche Diagnostics Ltd - Germany. Catalogue number; M, 87432). Prothrombin test was done using BFT* II Analyzer (Dade Behring Marburg GmbH, D-35041 Marburg, Germany).
Statistical analysis
Data was statistically analyzed using SPSS version 17 for Windows (SPSS Inc., Chicago, IL, USA). Comparisons between two groups were performed using the Student's t-test for continuous data, Mann-Whitney test for nonparametric variables and the χ2 and Fisher test for categorical data. Comparisons of the variables in the same group were performed using the paired t-test for continuous data and Wilcoxon test for non-homogenous data. Comparisons between multiple groups were performed by usage of ANOVA test for parametric variables and Kruskal Wallis Test for nonparametric variables. Odds ratio test was used to assess the development of PICD with groups. Multivariate logistic regression analysis was used for detection of PICD predictors. Results were expressed as mean±standard deviation. All P-values are 2 tailed, with values <0.05 considered statistically significant.
RESULTS
At inclusion there was no statistically significant difference (P>0.05) among all groups (group I through III) regarding the mean age (52.5±9.4 vs. 56.4±8.5 vs. 55.8±7.1 years), male sex (N=12 vs. 12 vs. 11), mean arterial pressure [MAP] (81.4±5.6 vs. 81.5±7 vs. 79.5±7.2 mmHg) and heart rate (84.9±7.9 vs. 86.1±9.6 vs. 86.5±8.7 beat/min) (Table 1).
Table 1. Demographic data of all patients according to the group of treatment at the time of inclusion.
a: group I vs. III
MAP, mean arterial pressure; INR, international normalized ratio; CP score, Child-Pugh score; PRA, plasma renin activity.
There was significant difference of the baseline weight (80.6±12.4 vs. 84.2±13.4 vs. 91±9.6 kg; P=0.03) being lower in group I than group III (80.6±12.4 vs. 91±9.6 kg).
The liver, kidney functions, INR and electrolytes were statistically nonsignificant among all groups (P>0.05). Bilirubin (4.5±3.6 vs. 3.3±2.5 vs. 2.9±2.2 mg/dL), serum albumin (2.1±0.4 vs. 2.2±0.3 vs. 2.3±0.4 g/dL), INR (1.9±0.8 vs. 1.6±0.3 vs. 1.6±0.3), urea (58.6±24.1 vs. 62.1±28.1 vs. 50.3±20.1 mg/dL), creatinine (0.9±0.3 vs. 0.9±0.2 vs. 0.9±0.3 mg/dL), Na (121.3±6.6 vs. 123±5.5 vs. 116.3±25.1 mmol/L), and K (4.4±0.7 vs. 4±0.5 vs. 4.5±0.7 mmol/L).
The Child-Pugh score (10.8±1.2 vs. 10.6±1.2 vs. 10.3±1.3), MELD (17.6±4.1 vs. 15.8±4.1 vs. 14.7±4.5) and MELD Na (25.2±2.9 vs. 24.4±2.6 vs. 23.3±4) were comparable among all groups (P>0.05).
The PRA at inclusion was comparable among all groups (1,366.0±1,244.9 vs. 1,151.3±1,444.8 vs. 951.9±1,088 pg/mL; P>0.05). Table 2 shows the flow (treatment) induced changes with each group. The delta (Δ) represents change from day 0 at inclusion to day 6 at discharge (Δ = D6 - D0). The minus (-) signs mean decreases value at day 6.
Table 2. Comparison of the flow induced changes among the different groups.
*Kruskal Wallis Test.
MAP, mean arterial pressure; CP score, Child-Pugh score; PRA, plasma renin activity.
There was no significant statistically difference of the treatment induced changes (P>0.05) among all groups regarding weight (1.25±1.77 vs. 1.80±2.44 vs. 0.80±1.40 kg), MAP (-2.92±10.33 vs. -4.51±9.10 vs. 1.34±11.26 mmHg), heart rate 5.90±7.66 vs. 6.70±8.11 vs. 4.10±4.36 beat/min), bilirubin (0.51±0.61 vs. 0.28±0.41 vs. 0.62±0.71 mg/dL), serum albumin (0.05±0.08 vs. 0.07±0.07 vs. 0.08±0.13 g/dL), urea (19.15±27.37 vs. 25.95±14.82 vs. 23.00±18.90 mg/dL), creatinine (0.23±0.27 vs. 0.38±0.33 vs. 0.26±0.18 mg/dL), Na (0.95±1.28 vs. 0.80±1.77 vs. 6.40±24.90 mmol/L), K (0.20±0.25 vs. 0.44±0.58 vs. 0.17±0.30 mmol/L), the Child-Pugh score (1.00±1.17 vs. 0.55±0.76 vs. 0.75±1.02), MELD (1.25±5.72 vs. 1.70±2.18 vs. 1.45±2.21) and MELD Na (0.85±3.41 vs. 1.20±2.40 vs. 1.30±2.75).
Fortunately there were no significant flow induced changes among all groups (Fig. 1) concerning PRA (450.93±614.10 vs. 394.61±954.64 vs. 629.51±1116.46 pg/mL; P>0.05).
Figure 1. Flow induced changes of the plasma renin activity (PRA) at day 0, 6 and the percent increase.
By the application of the PICD definition, about 6 patients developed PICD in group I, 5 in group II and 7 in group III (Table 3). Fruitfully there was no statistical significance among the different groups (P>0.05).
Table 3. Risk of paracentesis induced circulatory dysfunction development.
By the logistic univariate regression analysis (Table 4) for the predictors of PICD development, multiple variables were analyzed e.g. age, sex, weight, mean arterial pressure, heart rate, serum bilirubin, albumin, INR, hemoglobin, WBCs, platelets, urea, creatinine, Na, K, Child-Pugh score, MELD and MELD Na. Only female sex was fairly significant predictor of PICD development (Wald 3.85, odds ratio 3.14; P=0.05).
Table 4. Univariate analysis for predictors of paracentesis induced circulatory dysfunction development.
MAP, mean arterial pressure; CP score, Child-Pugh score; PRA, plasma renin activity.
DISCUSSION
The advent of ascites portends a bad prognosis with development of spontaneous bacterial peritonitis, dilutional hyponatremia, hepatorenal syndrome and short survival.4,5
Therapeutic paracentesis is better than diuretics for rapid and safe ascites relief with less adverse effects. PICD develops if more than 5 L ascites are tapped without giving plasma expanders.3
Noteworthy PICD leads to high ascites recurrence rate, development of hepatorenal syndrome, dilutional hyponatremia, and increased mortality.9
Notably most papers discussed how to prevent PICD development by different plasma expanders or the vasoconstrictors,21 but few discussed the influence of paracentesis flow rate on PICD development.
Cabrera et al.34 postulated that rapid abdominal decompression was a predictor of PICD development. About 11 patients underwent LVP were enrolled. A specially designed pneumatic girdle was used to compress the abdomen to avoid a decrease in intra-abdominal pressure (IAP) during ascites removal. Hemodynamic studies were performed before paracentesis, one hour after ascites flow stopped, and 30 minutes after pneumatic girdle deflation.
One hour after ascites removal, none of the hemodynamic parameters [cardiac output (CO), MAP or systemic vascular resistance (SVR)] was modified significantly. In contrast, 30 minutes after girdle deflation, a significant increase in CO and a significant decrease in both MAP and SVR. They hypothesized that abrupt abdominal decompression, occurring immediately after tense ascites removal portends PICD development. It may be assumed that mechanical decompression of an already dilated splanchnic vascular bed led to further arterial vasodilatation.34
Coll et al.35 studied the influence of flow rate of ascites extraction on PICD development. Twenty-two cirrhotic patients with tense ascites underwent LVP were enrolled. Measurements of intra-abdominal pressure and the volume of ascites removed were recorded every 10 min. Hormonal and hemodynamic measurements were performed at baseline and 3 h after total paracentesis. There was decreased SVR with increased nitrate level in 17 patients. These patients had higher baseline intra-abdominal pressure, shorter duration of paracentesis (60±4.9 vs. 88±0.4 min; P<0.01) and higher flow rate of ascites extraction (1.18±0.08 vs. 0.81±0.12 L/min; P<0.05). The volume of ascites removed was similar in patients with and without a decrease in SVR. But unfortunately PRA was measured at day of LVP and the following day so PICD definition9 cannot be applied.
In our study we fixed the volume of the ascitic fluid to be removed to avoid its cumulative effect on PICD development. The suction bottles are not available so we used a cannula connected to sterile urine collection bag through a drip line. It is known that the suction bottles needs less time to be filled to the urine bags. It is to be noted that the suction bottles do not depend on the positive abdominal pressure only for the fluid flow but also on the negative vacuum pressure in the bottles. Does this impact? Further studies are needed.
In the three different groups there was no significant flow mediated changes of the liver, kidney functions or the MELD scores. Fortunately the PRA did not differ statistically. The number of PICD development was comparable in all groups. Theoretically the more the flow rate, the more liability for PICD development but this was not the role. Really PICD mechanisms are still not well elucidated. It is not merely a mechanical process but other pathways are present but not detected yet. Carl et al.36 was the first to describe the inflammatory process associated with PICD development.
By the logistic regression analysis only the female gender was fairly 3 times more associated PICD development than males. Why? Really no explanation is available although Johnson et al.37 reported it.
Really the small number of this is a limitation so studies with larger numbers are warranted.
In conclusion the ascites flow rate does not correlate with PICD development.
Abbreviations
- CO
cardiac output
- IAP
intra-abdominal pressure
- LVP
Large volume paracentesis
- MAP
mean arterial pressure
- PICD
Paracentesis induced circulatory dysfunction
- PRA
Plasma renin activity
- SVR
systemic vascular resistance
Footnotes
Conflicts of Interest: The authors have no conflicts to disclose.
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