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Evaluation of Relative Resuscitative Effects of Hypertonic and Isotonic Saline Solutions as an Adjunct to Ceftiofur HCl in Bovine Neonatal Diarrhea Associated with Escherichia coli.

Byline: Muhammad Arif Zafar, Ghulam Muhammad, Zafar Iqbal, Arfan Yousaf, Asif Riaz and Murtaz-ul-Hasan

Abstract

This study was conducted for evaluation of relative efficacy of hypertonic saline (HSS) and isotonic saline (ISS) solutions in neonatal diarrhea associated with Escherichia coli (E. coli) in buffalo calves. For this purpose, neonatal diarrhea was induced in 24 healthy male buffalo calves through oral administration of eneteropathogenic E. coli (K99). After 12 h of successful induction of diarrhea, the calves were randomly divided into two equal groups viz. A and B (n=12 each). Group A was treated with ISS @ 90 mL/kg body weight (BW), while calves of group B were administered HSS @ 4 mL/kg BW. Both groups were additionally treated with ceftiofur HCl and flunixin meglumine @ 6 and 2 mg/kg BW, IM, respectively. The relative efficacy of two treatments was evaluated on the basis of clinical parameters, hematological analyses, hemodynamic parameters, blood gas analyses and serum electrolytes.

All parameters were recorded at baseline (before induction of diarrhea), during diarrhea, t=1, t=3, t=6, t=12, t=24 and t=36 h after treatment. The calves treated with HSS (group B) resuscitated from neonatal diarrhea more rapidly (within 24 h) and effectively than ISS (group A) and showed significant (P less than 0.05) improvement. At t=24 h, values for mean arterial pressure, central venous pressure and arterial oxygen delivery were 108.69.8 and 116.314.2, 121.4 and 15.51.5 and 69.33.3 and 85.53.7 in groups A and B, respectively. Calves of group B also experienced decrease in hematocrit and hemoglobin concentration as well as increases in blood pH, bicarbonate concentration and serum electrolytes.

On the basis of findings of this study, it was concluded that HSS offsets deleterious hemodynamic effects of hypovolemia, improves oxygenation, corrects metabolic acidosis and increases survival in E. coli associated neonatal diarrhea of buffalo calves which makes it more practical and economical alternative to the use of large volumes of isotonic saline solution for use in field settings.

Keywords: Hypovolemia; Dehydration; Acidosis; Induction; Neonatal Diarrhea; Hypertonic saline

Introduction

Neonatal diarrhea caused by E. coli and other gut associated microorganisms is a serious welfare problem and is considered one of the main causes of calf death worldwide and also of financial loss in the cattle industry. The mean incidence of diarrhea in individual herds of cattle can be as high as 80% (Cornaglia et al., 1992; Khan and Khan, 1995; Wright et al., 1995); therefore, rates of diarrhea greater than 50% are not unusual. The mortality rate due to diarrhea varies up to 25% (Khan and Khan, 1995; Buenau et al., 2005; Khan et al., 2009). Successful treatment of diarrheic calves based primarily on the use of broad-spectrum antibiotics or other antimicrobials along with administration of fluids and electrolytes for the correction of dehydration and acidemia (Roussel and Kasari, 1990; Berchtold, 1999; Senturk, 2003; Buenau et al., 2005).

Therefore, intravenous administration of isotonic fluids is considered to be the best methods for treating severely dehydrated and acidotic calves with diarrhea (Simmons et al., 1985; Roussel and Kasari, 1990; Walker et al., 1998; Berchtold, 1999; Senturk, 2003). It is recommended @ 90 mL/kg BW which is a large volume to infuse throughout a 3 to 4 h period to correct hydration status (Roussel and Kasari, 1990; Constable et al., 1996; Walker et al., 1998; Flores et al., 2006; Hasanpour et al., 2009). Infusion of required volumes of isotonic fluids is quite difficult in on-farm situations, because of the requirement of more than one catheterization, proper restraint and periodic monitoring (Constable et al., 1996; Walker et al., 1998). So, a more practical method for IV administration of fluids requiring small volumes would be advantageous.

Hypertonic saline solution (77.5% NaCl) has gained much popularity for the last two decades as a small-volume, rapid and effective method for fluid administration in severely dehydrated diarrheic calves (Constable et al., 1996; Walker et al., 1998; Senturk, 2003; Flores et al., 2006) and has also been successfully used to resuscitate humans, sheep, horses, dogs and cats with hypovolemia and/or endotoxemia (Velasco et al., 1980; Nakayama et al., 1984; Constable et al., 1991a; Kramer et al., 2003; Somell et al., 2007). Intravenous administration of HSS causes an initial rapid influx of fluid into the vasculature due to the sudden hypertonic state of plasma in a relatively short time (Constable et al., 1991a; Walker et al., 1998; Bleul et al., 2007; Leal et al., 2012). Plasma volume expansion is, therefore, achieved with lesser free water administration than with isotonic solutions.

Since administration of a hypertonic should lead to recruitment of extravascular fluids into the vascular compartment, HSS seems likely to produce a more rapid response and marked hemodynamic effects than isotonic solutions (Bleul et al., 2007; Leal et al., 2012) with a small-volume @ 4 mL/kg BW.

Enough information is available on use of HSS in calf diarrhea, however, information on its use in neonatal calf diarrhea associated with E. coli is totally nonexistent. So, this study was planned to evaluate the efficacy of HSS as an adjunct to ceftiofur HCl (a third generation cephalosporin) and flunixin meglumine (a NSAID) in neonatal diarrhea associated with E. coli in calves and to compare its resuscitative response with that of ISS along with ceftiofur HCl and flunixin meglumine.

Materials and Methods

Experimental Animals

The experiment was conducted in accordance with a protocol approved by the Institutional Animal Ethics Committee, University of Agriculture, Faisalabad, Pakistan. The study was conducted on 24 University-owned, colostrum-fed healthy male buffalo calves of 57 days old and with a mean weight of 35 4.5 kg. Animals underwent a 7 days acclimatization period. These calves were maintained at Livestock Experimental Station, University of Agriculture, Faisalabad, Pakistan. Animals were housed in individual movable iron pens 30 cm above the ground and with wooden-strip floor. The diet consisted of a milk replacer (Telelac(R), ICI Animal Health Division, Pakistan) administered PO through bottles with nipple, bid @ 10 percent of body weight per calf per day.

Instrumentation

The day prior to induction of neonatal diarrhea, the calves were sedated with xylazine HCl (Xylaz(R), Farvet Laboratories, Holland) @ 0.02 mg/kg of body weight, IM, for aseptic placement of intravenous catheters. The hair over the right and left jugular furrows were clipped and the skin was scrubbed surgically for aseptic placement of IV catheters. For infusion of solutions and collection of blood samples, catheter of 18-gauge was placed in right jugular vein, while left jugular vein was catheterized with 7-F thermodilution Swan-Ganz catheter for recording central venous pressure (CVP). Girdle area was shaved and prepared aseptically for cannulation of femoral artery with the help of 22-gauge catheter for the measurement of mean arterial pressure (MAP) and collection of blood samples for determination of partial pressure of arterial oxygen (PaO2).

Jugular catheters were flushed with 1 mL and 0.5 mL saline (0.9% NaCl) solution containing 5 U of sodium heparin/mL at the time of infusion of solutions and sampling, respectively. Swan-Ganz and femoral artery's catheters were flushed with heparinized saline solution containing 40 IU heparin/mL before measuring the CVP and MAP, respectively. Xylazine sedation was reversed by administering tolazoline HCl (1 mg/kg) (Tolazin(R), Lloyd Laboratories Inc., USA) after catheterization. The calves were placed in movable pens 12 h after instrumentation. Baseline values were then recorded by obtaining blood samples.

Induction of Diarrhea

An enteropathogenic E. coli (antigen K99) isolated from a field case of neonatal calf diarrhea was procured from National Institute of Agriculture and Biology (NIAB), Faisalabad, Pakistan. Infection was introduced through oral administration of 2 mL broth culture (E. coli count = 1010 CFU/mL dissolved in 250 mL of normal saline to each calf of both groups (Brooks et al., 1996; Zaman, 2001). Diarrhea was induced successfully in all the calves within 6 to 8 h. Twelve h after the onset of diarrhea (10% dehydration, skin tenting time greater than 3 but less than 8 seconds, markedly sunken eyes), calves of both the groups were considered for the treatment phase.

Experimental Design

At the start of treatment phase, calves were randomly allocated through random number table (Chow and Lin, 2004) to either a control or a test group (n=12 calves/group). All fluids used in the treatment phase were warmed to 37oC immediately before administration. Calves in control group (Group A) were infused intravenously with ISS (0.9% NaCl) @ 90 mL/kg BW along with ceftiofur HCl @ 6 mg/kg BW, IM and flunixin meglumine @ 2 mg/kg BW, IM. Calves of group B (test group) were dosed intravenously with HSS (7.5% NaCl) @ 4 mL/kg BW during a 4-min period via jugular vein followed by ISS @ 10 mL/kg BW, in combination with ceftiofur HCl @ 6 mg/kg BW, IM and flunixin meglumine @ 2 mg/kg BW, IM.

In both groups, fluids were infused once at the first day treatment, while ceftiofur HCl and flunixin meglumine were repeated after 24 and 12 h, respectively. Administration of HSS provided 4.9 mmol of Na/mL.

The physical condition of each calf was assessed throughout the study and calves that were unable to stand without assistance were not considered for study. At the completion of the study, milk replacer feeding was reinstated and administration of conventional IV fluid was instituted as needed, determined on the clinical assessment.

Measurement and Analysis of Samples

Clinical parameters (survival rate, rectal temperature, respiratory rate and heart rate), hematological profiles (hemoglobin concentration, hematocrit), serum electrolytes (sodium, chloride and potassium ions concentration), blood gas analysis [partial pressure of arterial oxygen (PaO2), venous carbon dioxide (PvCO2), venous blood pH and bicarbonates(HCO3 )] and hemodynamic parameters (mean arterial pressure, central venous pressure) were measured to evaluate the comparative resuscitative effects of HSS and ISS along with ceftiofur HCl and flunixin meglumine in E. coli associated neonatal diarrhea.

For hematological analyses, 2 mL of blood was collected into evacuated tubes that contained EDTA. The hemoglobin concentration (Hb conc.) was determined by cyannmethemoglobin method and hematocrit (HCT) values were determined with microhematocrit method as described by Benjamin (1978). For blood gas analysis, 1 mL blood was collected anaerobically in heparinized syringe and the tip was capped (Constable et al., 1996). The syringe was placed on ice and processed within an h of collection by automatic gas analyzer (Blood Gas Analyzer, Medica Corporation, Bedford, USA). Values were automatically corrected to rectal temperature. For measurement of electrolytes, 5 mL of blood was collected into evacuated tubes without anticoagulant to harvest serum followed by centrifugation and storage at -20oC until assayed. The serum was then analyzed for sodium, chloride and potassium ions concentration through flame photometer.

All the mentioned parameters were recorded at baseline (before induction of diarrhea), during diarrhea, t=1 h, t=3 h, t=6 h, t=12 h, t=24 h and t=36 h after institution of allotted treatment to the groups.

Statistical Analyses

The significance of differences between the treatment groups was analyzed by a student t-test. Differences between points of time within a group were checked by one- way analysis of variance (ANOVA). The significance of differences between groups was tested by Duncan's Multiple Range (DMR) Test. Differences were classified as significant if P less than 0.05 (Steel and Torrie, 2004).

Results

A total of 24 colostrum-fed, male calves formed the basis of part of the present study. After adaptation period of 7 days, these calves were induced diarrhea with oral administration of E. coli broth culture. After 6 to 8 h, the protocol of diarrhea induction resulted in intense aqueous diarrhea in 100% of the animals. Twelve h after the onset of diarrhea, the calves with 10% dehydration were treated with ISS (group A) and HSS (group B) saline solutions in combination with ceftiofur HCl and flunixin meglumine. Mean values of all parameters observed differed non- significantly in calves of control and test groups prior and during infection.

Clinical Parameters

Survival Rate: Each group comprised of 12 calves after induction of diarrhea. After treatment, mortality was observed in calves of both groups but it was higher in ISS treated group (group A) than HSS treated (group B). However, statistical difference was non-significant (Table 1).

Body Temperature: A significant increase in body temperature was observed during diarrhea in calves of both groups. After treatment, a significant decrease was noted in both groups, however, group B showed significant difference (P less than 0.05) over group A at t=1 h. Both groups attained basal values within 12 h (Table 2).

Respiration Rate: A significant decrease was observed in respiration rate in calves of both groups during infection which increased significantly after administration of specific treatment protocols at t=1 h in both groups followed by significant decrease again. At t=6 h, group A showed significant difference (P less than 0.05) over group B. After that a rapid increase was observed in group B and it showed a significant difference (P less than 0.05) over its counterpart at t=24 h (Table 2). Both groups recovered the baseline values within observing period.

Heart Rate: Increased heart rate was observed during diarrheic condition in both groups. After institution of treatments, heart rate decreased significantly (P less than 0.05) in both groups. Both groups followed a sharp decreasing trend toward baseline values (Table 2), however, group A differed significantly (P less than 0.05) from group B at t=3 h when a transitly increased heart rate was observed in group B followed by significant increase in its values (Table 2).

Hematological Analyses

Hematocrit: Increased values of HCT were noted during diarrhea. Treatment institution to the calves helped in decreasing the increased values of HCT significantly in both groups. Both groups showed good recovery towards baseline but better recovery rate was observed in calves of group B (Table 2). The baseline values were recovered within 12 h post-treatment in both groups.

Hemoglobin Concentration: The protocol to induce diarrhea increased concentration of Hb in neonate calves.

Table 1: Survival rate of buffalo calves treated with two different treatment protocols after induction of E. coli associated diarrhea

###Time after treatment (hours)

###Baseline 1###3###6###12###24###36

Group A 12###11###11###10###10###09###09

Group B 12###12###11###11###11###11###11

After administration of treatment to groups A and B, values of Hb conc. decreased significantly (P less than 0.05). Both treatment protocols showed similar trend in recovering the Hb conc. toward normal (Table 2). The baseline values were recovered within experimentally time in both groups.

Hemodynamic Parameters

Mean arterial pressure: During diarrhea, MAP decreased significantly (P less than 0.05) in both groups. Within first h after treatment (t=1 h), it increased in both groups but group B showed significant increase (P less than 0.05) and baseline values were achieved at t=3 h after infusion of HSS and showed significant difference (P less than 0.05) over group A, while MAP was near to normal in group A at t=36 h (Fig. 1).

Central Venous Pressure: It decreased significantly in all the calves with induced diarrhea. After institution of treatment, a significant increase was observed in both groups but group B which was treated with HSS recovered the basal values at t=3 h and showed significant difference (P less than 0.05) over group A throughout the study except at t=6 h, at which it showed significant fall in CVP (Fig. 2). Administration of ISS to group A was unable to recover the CVP to baseline within experimental period.

Blood Gas Analyses

Arterial Oxygen: A significant decrease was observed in arterial pressure of oxygen (PaO2) during infection which increased significantly in both groups after treatment. However, group B showed better recovery toward basal values and showed significant difference (P less than 0.05) over group A at each observational time throughout the experimental period (Fig. 3).

Venous Carbon Dioxide: A significant increase was noted in PvCO2 during diarrhea. After institution of treatment, group B showed significant decrease in PvCO2 at t=1 h, while no change was observed in group A. At t=3 h, group A showed significant (P less than 0.05) decrease in CO2 pressure but it was continuous in group B which showed significant difference (P less than 0.05) over group A except at t=12 h and at t=24 h, where, a transit increase in values were observed. Group A showed decreasing trend in PvCO2 toward baseline but failed to achieve it within study period (Fig. 4), while HSS administration to group B recovered the baseline values successfully.

Blood pH: During diarrhea, significant decrease (Pless than 0.05) in blood pH values was observed in both groups.

After treatment, both groups showed a slow increasing trend toward baseline and differed non-significantly from each other. Both groups were unable to achieve the baseline values of blood pH within study period, albeit these values were near to baseline at t=36 h (Fig. 5).

Bicarbonates: During diarrhea, a significant decrease (Pless than 0.05) was observed in values of HCO3 in both groups.

After treatment, HCO3 values increased in group A and showed significant difference (P less than 0.05) over group B at t=1 h. Group A showed continuous increasing trend toward baseline, while group B showed fluctuating trend of increasing and decreasing at different intervals (Fig. 6). At t=36 h, both groups recovered the HCO3 baseline.

Table 2: Results of serum electrolytes, hematology and clinical parameters for samples obtained from neonate calves induced with diarrhea before and after treatment in two groups

Variables###Groups###Time after treatment

###Baseline###Diarrhea###t=1 h###t=3 h###t=6 h###t=12 h###t= 24 h###t=36 h

Sodium###Group A###135.1711.72A###123.5812.65B###124.8313.33B###129.4213.51AB###13214.17AB###129.1714.89AB 135.3313.45A 135.2510.81A

(mmol/L)###Group B###133.2514bc###124.4213.91c###133.3312.29bc###143.510.75a###136.0811.86ab###139.1711.85ab 137.510.66ab 133.3310.70bc

Chloride###Group A###97.58.98A###79.5810.77D###84.7510.08CD###91.178.92ABC###85.338.05BCD###93.089.13AB###96.3310.38A###96.7511.22A

(mmol/L)###Group B###101.929.74a###81.5815.23c###91.2515.46bc###104.6713.5a###97.0810.91ab###96.8311.02ab###100.7511.11ab 101.9211.97a

Potassium###Group A###4.581.29A###3.341.44A###3.51.07A###3.81.05A###3.371.1A###3.541.22A###41.03A###4.441.01A

(mmol/L)###Group B###4.721.17a###3.691.18ab###3.371.06b###3.081.15b###3.531.34b###3.81.42ab###3.941.51ab###4.581.22a

Hematocrit###Group A###344.43B###40.174.02A###37.084.4AB###33.425.62B###35.335.91B###33.584.48B###344.39B###34.424.89B

(%)###Group B###32.755.88b###39.426.92a###34.56.35b###35.255.58b###35.584.5b###33.175.64b###31.754.8b###32.334.56b

Hb conc###Group A###11.672.39A###15.253.22A###12.674.03A###11.503A###11.833.33A###12.753.36A###11.672.9A###11.833.71A

(g/dL)###Group B###11.832.59b###162.04a###12.082.11b###11.922.39b###13.172.21b###11.581.44b###11.751.36b###11.751.71b

Body Temp###Group A###38.330.12DE###39.270.15 A###38.900.14 B###38.440.12C###38.360.12CD###38.230.12E###38.350.12CD###38.370.12D

(oC)###Group B###38.220.16c###39.350.26 a###38.670.23 b###38.370.14c###38.660.19b###38.240.14c###38.270.17c###38.280.15c

Heart rate###Group A###815.94E###105.673.98A###95.334.46B###85.676.02D###907.53C###82.334.66DE###814.86E###83.332.87DE

(beats/min)###Group B###866.03cd###110.674.29a###90.333.98c###975.43c###89.336.68c###83.336.79d###86.335.25cd###86.333.98cd

Resp. rate###Group A###30.673.55A###21.332.61C###28.672.87B###253.46C###30.333.98A###29.333.94A###30.334.66A###31.333.34A

(breadths/min)###Group B###32.334.66ab###20.674.12d###30.334.33b###26.673.55c###24.332.67c###30.672.61ab###33.332.61a###31.173.56ab

Serum Electrolytes

Sodium Ions Concentration: Hyponatremia was observed in calves subjected to the protocol of induced diarrhea. A significant increase (P less than 0.05) in the sodium concentration was observed at t= 3 h after infusion of HSS to calves of group B. Contrarily, a non-significant difference was noted in group A treated with ISS (Table 2). The Na+ ions concentration decreased after t=3 h rapidly in group B and matched with basal values within experimental period and it also showed significant difference (P less than 0.05) to group A at t=3 h and t=12 h. On the other hand, group A attained basal values at t=24 h (Table 2).

Chloride Ions Concentration: During diarrhea, there was hypochloremia in the calves of all groups subjected to protocol of induction of diarrhea. In HSS treated group (group B), in contrast to its counterpart group (group A), Cl- ions concentration increased significantly (P less than 0.05) after treatment and showed significant difference at t=3 h by attaining peak value. At t=6 h, Cl- ions concentration decreased (P less than 0.05) and attained the baseline value (Table 2). The concentration of Cl- ions in calves treated with ISS (group A) increased and reached the basal value at t=24 h (Table 2).

Potassium Ions Concentration: Induction of diarrhea affected a significant decrease in serum concentration of K+ ions compared to their basal values. Concentrations of K+ ions in calves treated with HSS and ISS presented different results during study period (Table 2). In group B treated with HSS, K+ ions concentration first decreased followed by a rapid increase and matched with baseline (P greater than 0.05) at t=36 h. In group A treated with ISS, K+ ions concentration increased and significantly differed (P less than 0.05) from group B at t=3 h. However, basal values were recovered at t=36 h (Table 2).

Discussion

The present study was conducted to evaluate the relative efficacy of two crystalloids (ISS and HSS) in combination with parentral administration of an antibiotic (ceftiofur HCl) and a NSAID (flunixin meglumine) in calves in which diarrhea had been induced by the oral administration of E. coli (K99). The protocol to induce neonatal diarrhea promoted severe diarrhea in 100% of the calves. A moderate dehydration around 10%, hyponatremia, hypochloremia, hypokalemia, decreased arterial oxygen pressure, blood pH, bicarbonates and increased body temperature, heart rate, partial pressure of carbon dioxide were recorded during induced neonatal diarrhea.

Dehydration in calves with neonatal diarrhea is accompanied by a decrease in extracellular fluid volume resulting in decreased plasma volume (Walker et al., 1998). The aim for the treatment of severely dehydrated calves with neonatal diarrhea is to restore plasma volume rapidly, thereby improving cardiac output, increasing mean arterial pressure and oxygen delivery and correcting acid-base and electrolyte imbalance.

The protocol for induction of neonatal diarrhea with E. coli (K99) caused mortality in calves of both groups but decreased mortality was observed in group B which can be attributed to the use of HSS in this treatment group. In the present study, increased heart rate was observed in dehydrated diarrheic calves. These results have already been envisaged in previous studies that decrease in plasma volume stimulates sympathetic nervous system which increases the heart rate through peripheral vasoconstriction. It also stimulates rennin-angiotensin-aldosterone system to maintain mean arterial pressure, heart balance and organ perfusion (Flores et al., 2006; Bleul et al., 2007). In calves with diarrhea, heart rate decreased toward baseline after administration of ISS and HSS to groups A and B, respectively.

An immediate expansion in plasma volume due to increased serum osmolarity is the contributing factor for activation of cardiovascular reflex mechanisms (Bertone et al., 1990; Constable et al., 1995; Bleul et al., 2007). These effects were, however, transient; lasting only for one h and then heart rate dropped and became normal rapidly.

The results of the present study indicated increased hematocrit and Hb conc. in dehydrated diarrheic calves. Similar results have also been reported in previous studies as increase in HCT and Hb conc. is the cause of decreased plasma volume (Constable et al., 1991b; Senturk, 2003). In the studies conducted by Constable et al. (1991b) and Senturk (2003) wherein intervention with a fixed volume of HSS with or without dextran was undertaken after endotoxin infusion, an immediate response to fluid treatment (with a decrease in HCT and Hb conc.) was found indicating expansion in intravascular volume. We also found a rapid decrease in values of HCT and Hb conc. in this study which indicates that fluid resuscitation with HSS was effective for plasma volume expansion.

Hypertonic saline solution caused immediate and significant increase in MAP and CVP values which had fallen in calves as a consequence of neonatal diarrhea. This is most likely a volume resuscitation effect associated with increased preload and inherent positive inotropic effect of HSS (Somell et al., 2007). The other factor involved is the rapid plasma volume expansion, which occurs within 1 h of the infusion because of the immediate increase in serum osmolarity and serum sodium concentration, promoting fluid circumvent from intracellular compartment and gastrointestinal tract (Constable et al., 1991b; Rocha e Silva, 2005). Some previous studies e.g. Constable et al. (1996) and Walker et al. (1998) have recommended the use of 6% dextran-70 in association with HSS to maintain plasma expansion. However, our results point to the potential of HSS to cause plasma expansion without dextran. These findings of our study are also supported by the results reported by Flores et al. (2006).

Blood gas analyses are frequently used to determine the imbalance of acid/base status and it also helps to develop effective treatment plan to resuscitate the patient from acidemia. In the present study, decreased arterial oxygen pressure (PaO2), increased venous carbon dioxide pressure (PvCO2), decreased blood pH and bicarbonates were noted in calves suffering from neonatal diarrhea. Decreased PaO2 indicated that animals were suffering from hypoxemia. It could be due to the endothelial cell edema in the endothelium of postcapillary venules which cause obstruction in the blood flow and reduction in oxygen transport (Oliveira et al., 2002). It is also hypothesized that HSS induces endothelial cell shrinkage resulting in improved tissue perfusion and oxygen delivery (Oliveira et al., 2002; Koch and Kaske, 2008; Leal et al., 2012). Infusion of HSS to the calves of group B also decreased the pressure of CO2 resulting in increased blood pH and bicarbonates which helped in recovering the calves from acidosis.

These results are supported by the findings of several previous studies (Constable et al., 1991b; Senturk, 2003; Somell et al., 2007; Koch and Kaske, 2008; Hasanpour et al., 2009; Leal et al., 2012).

Hyponatremia has previously been reported in E. coli associated diarrhea in cow calves (Constable et al., 1996; Berchtold, 1999; Flores et al., 2006). In contrast to normal saline, administration of HSS immediately increased serum sodium concentration in buffalo calves but it remained below the value of hypernatremia (reference value = 160 mmol/L; Constable et al., 1996).

No evidence of severe hypernatremia has been reported after using HSS @ 4 mL/kg BW (Rocha e Silva, 2005; Koch and Kaske, 2008; Leal et al., 2012). In our study, the highest serum sodium after the initial fluid administration was 143.5 10.75 mmol/L. However, HSS is contradicted in chronic symptomatic or asymptomatic hyponatremia as it causes neurological complications (Dibartola, 2000). In our study, no abnormality in the behaviour and attitude of the buffalo calves was observed after infusion of HSS.

Conclusion

On the basis of findings of this study, it was concluded that HSS can be safely administered to the buffalo calves suffering with neonatal diarrhea associated with E. coli. It offsets deleterious hemodynamic effects of hypovolemia, improves oxygenation, corrects metabolic acidosis and leads to increased survival rate in buffalo calves suffering from E. coli induced diarrhea. The small volume of HSS seems a more practical and economical alternative to the use of large volumes of isotonic saline solution for use in field settings. In view of the preliminary nature of the present study, additional work on use of HSS in neonatal buffalo calf diarrhea and acid base status is clearly warranted. As also is the need to test the efficacy of HSS in the treatment of spontaneously occurring diarrhea in buffalo calves.

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Author:Zafar, Muhammad Arif; Muhammad, Ghulam; Iqbal, Zafar; Yousaf, Arfan; Riaz, Asif; Murtaz-ul-Hasan
Publication:International Journal of Agriculture and Biology
Article Type:Report
Geographic Code:9PAKI
Date:Oct 31, 2015
Words:5786
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