Clinical Review of Intravenous Fluid Prescribing Patterns in Tertiary Care Hospitals

Intravenous (IV) fluid therapy represents a fundamental component of patient management in contemporary clinical practice and is extensively utilized across various hospital settings, particularly in tertiary care institutions where critically ill patients are treated¹. The administration of IV fluids is essential for preserving intravascular volume, maintaining electrolyte homeostasis, and ensuring adequate tissue perfusion in a wide range of clinical conditions². It has been reported that a significant proportion of hospitalized patients receive intravenous fluids during their course of treatment, emphasizing its importance as one of the most frequently prescribed therapeutic interventions³.

Although IV fluid therapy is routinely practiced, it is increasingly acknowledged as a complex clinical intervention that demands careful evaluation and individualized decision-making. Fluids should be regarded as pharmacologically active agents, with specific indications, contraindications, dosing considerations, and potential adverse effects?. Inappropriate prescribing practices, including incorrect selection of fluid type, volume, or rate of administration, may result in serious complications such as fluid overload, electrolyte imbalance, acid–base disturbances, and increased risk of morbidity and mortality?. Evidence from clinical studies indicates that nearly one-fifth of hospitalized patients may experience adverse outcomes related to suboptimal fluid management?.

In tertiary care hospitals, the responsibility of prescribing IV fluids frequently lies with junior clinicians, interns, or early-career practitioners, who may not always possess adequate training or clinical expertise in fluid therapy?. Several studies have demonstrated that healthcare professionals often face challenges in accurately assessing a patient’s fluid status, determining appropriate fluid requirements, and selecting the most suitable type of fluid for specific clinical scenarios?. This lack of confidence and structured training contributes to considerable variability and inconsistency in prescribing patterns.

To improve clinical practice, evidence-based guidelines such as those issued by the National Institute for Health and Care Excellence (NICE) have proposed a systematic framework for IV fluid therapy, categorizing it into resuscitation, maintenance, replacement, and reassessment phases?. Despite the availability of such guidelines, adherence remains inconsistent across healthcare institutions due to factors such as limited awareness, absence of standardized hospital protocols, and variability in clinical judgment¹?.

Another important concern in fluid therapy is the inappropriate choice between different types of fluids, particularly crystalloids and colloids. Normal saline continues to be widely used in many clinical settings; however, excessive administration has been associated with complications such as hyperchloremic metabolic acidosis and renal dysfunction¹¹. Recent evidence increasingly supports the use of balanced crystalloids, which are associated with improved physiological outcomes and reduced risk of adverse effects¹². Nevertheless, the adoption of these alternatives varies considerably across institutions and clinical specialties.

Furthermore, inadequate monitoring of patients receiving IV fluids, including poor documentation of fluid balance, lack of regular reassessment, and insufficient electrolyte surveillance, further contributes to inappropriate fluid therapy¹³. The dynamic nature of fluid requirements in hospitalized patients necessitates continuous evaluation to prevent both under-resuscitation and fluid overload.

Given the complexity of IV fluid therapy and the significant impact of prescribing errors on patient outcomes, it is imperative to critically evaluate current prescribing practices in tertiary care settings. Identifying common patterns, gaps in guideline adherence, and areas of clinical concern can provide valuable insights for improving patient care. Therefore, this review aims to comprehensively assess intravenous fluid prescribing patterns in tertiary care hospitals, evaluate compliance with established guidelines, and highlight potential strategies to promote rational, safe, and evidence-based fluid therapy.

2. METHODOLOGY

The present review was conducted as a systematic narrative review with the objective of critically analyzing intravenous fluid prescribing patterns in tertiary care hospital settings. A structured and comprehensive literature search strategy was employed to ensure the inclusion of relevant and high-quality studies addressing fluid therapy practices and their clinical implications.

A detailed search of electronic databases, including PubMed, Scopus, Web of Science, and Google Scholar, was performed to identify studies published between January 2000 and March 2025. These databases were selected to ensure wide coverage of peer-reviewed biomedical literature and to capture both classical and recent evidence related to intravenous fluid therapy¹?.

The search strategy involved the use of multiple keywords and their combinations, such as “intravenous fluid therapy,” “fluid prescribing patterns,” “tertiary care hospitals,” “crystalloids,” “colloids,” “fluid therapy errors,” and “clinical audit of IV fluids.” Boolean operators (AND, OR) were applied to refine the search results and improve specificity. Additional manual screening of reference lists from selected articles was also performed to identify further relevant studies that might not have been captured during the initial search process¹?.

All identified studies were subjected to a preliminary screening based on titles and abstracts, followed by full-text evaluation to determine eligibility. The selection process was guided by predefined inclusion and exclusion criteria to maintain consistency and reduce selection bias.

2.1 Inclusion Criteria

The following criteria were used for selecting studies:

1. Research conducted in tertiary care hospitals or similar advanced healthcare settings
2. Observational studies, prospective or retrospective analyses, randomized controlled trials, clinical audits, and review articles
3. Studies focusing on intravenous fluid prescribing patterns, adherence to clinical guidelines, or associated patient outcomes
4. Articles published in the English language with accessible full text

2.2 Exclusion Criteria

Studies were excluded based on the following conditions:

1. Research conducted in primary care or community healthcare settings
2. Case reports, editorials, letters to the editor, and conference abstracts without sufficient data
3. Studies lacking clearly defined outcome measures or methodological transparency

2.3 Data Extraction And Synthesis

Relevant data from the selected studies were systematically extracted, including information on study design, sample size, clinical setting, types of intravenous fluids prescribed, prescribing indications, adherence to established guidelines, and reported clinical outcomes. Particular emphasis was placed on identifying trends in prescribing behaviour, common errors, and variations in clinical practice.

The extracted data were synthesized using a qualitative approach, allowing for a comprehensive interpretation of findings across diverse study designs. Key themes such as inappropriate fluid selection, deviations from recommended guidelines, and inadequate monitoring practices were analyzed in detail. The review also considered adherence to widely accepted clinical guidelines, particularly those proposed by the National Institute for Health and Care Excellence (NICE), which provide a structured framework for fluid therapy in hospitalized patients?.

To enhance the reliability of the findings, priority was given to studies published in high-impact, peer-reviewed journals. Variations in prescribing practices across different specialties and geographical regions were also examined to provide a broader understanding of the issue¹?.

3. TYPES OF INTRAVENOUS FLUIDS

Intravenous fluids are broadly categorized into crystalloids and colloids, each differing in composition, distribution characteristics, and clinical applications¹¹. The appropriate selection of fluid type is a critical determinant of therapeutic success, as different fluids exert varying effects on intravascular volume, interstitial balance, and electrolyte homeostasis.

3.1 Crystalloids

Crystalloids are solutions composed of water and low-molecular-weight solutes, such as electrolytes or glucose, which readily diffuse across semi-permeable membranes. Due to their ease of availability, lower cost, and favourable safety profile, crystalloids are the most frequently administered intravenous fluids in both emergency and routine clinical care¹².

These fluids distribute rapidly within the extracellular compartment, with only a fraction remaining in the intravascular space after infusion. Despite this, they are widely used for volume resuscitation, maintenance therapy, and correction of electrolyte imbalances.

Classification of Crystalloids:

1. Isotonic solutions:

These fluids have an osmolarity similar to plasma and primarily expand the extracellular fluid compartment.

Examples: 0.9% Normal Saline (NS), Ringer’s Lactate (RL)

2. Hypotonic solutions:

These have lower osmolarity than plasma and facilitate movement of water into cells, making them useful in cellular dehydration.

Example: 0.45% Sodium Chloride

3. Hypertonic solutions:

These possess higher osmolarity and draw water from intracellular to extracellular compartments.

Example: 3% Sodium Chloride

Balanced crystalloids, such as Ringer’s Lactate and Plasma-Lyte, are increasingly preferred over normal saline due to their closer resemblance to plasma electrolyte composition and reduced risk of hyperchloremic metabolic acidosis and renal dysfunction¹².

Figure 1: Fluid distribution in body compartments and effect of intravenous fluids

3.2 Colloids

Colloids are solutions containing high-molecular-weight substances, such as proteins or synthetic polymers, which remain within the intravascular compartment for a longer duration compared to crystalloids¹¹. These fluids exert oncotic pressure, thereby promoting plasma volume expansion with relatively smaller infused volumes.

Commonly used colloids include:

1. Human albumin
2. Dextrans
3. Hydroxyethyl starch (HES)

Although colloids offer theoretical advantages in maintaining intravascular volume, their clinical use has declined due to concerns regarding higher cost, risk of anaphylactic reactions, coagulopathy, and potential renal toxicity, particularly with synthetic starches¹³. Current evidence suggests that crystalloids are generally preferred for most clinical indications, except in selected cases requiring targeted plasma expansion.

Figure 2: Category of IV Fluids

Table 1: Classification and Clinical Characteristics of Intravenous Fluids

3.3 Clinical Considerations In Fluid Selection

The selection of intravenous fluids should be individualized based on patient-specific factors, including age, underlying disease, hemodynamic status, electrolyte balance, and organ function¹?. In critically ill patients, inappropriate fluid selection can significantly influence clinical outcomes.

Key considerations include:

1. Assessment of fluid deficit and ongoing losses
2. Monitoring of serum electrolytes and renal function
3. Avoidance of fluid overload, especially in cardiac or renal patients
4. Preference for balanced crystalloids in most clinical scenarios

Recent clinical evidence supports a restrictive and goal-directed fluid strategy, which has been associated with improved patient outcomes and reduced complications such as pulmonary edema and acute kidney injury¹?.

Figure 3:  Fluid Distribution in Body Compartments

Figure 4:  Types of IV Solution

Figure 5:  Body water compartments

4. INTRAVENOUS FLUID PRESCRIBING PATTERNS

Intravenous fluid prescribing practices in tertiary care hospitals demonstrate considerable variability across different clinical departments and levels of expertise among healthcare professionals. Despite the availability of well-established clinical guidelines, multiple studies have reported inconsistent adherence and frequent deviations from recommended practices, which may adversely affect patient outcomes¹?. The complexity of patient conditions in tertiary care settings further contributes to variability in prescribing behaviour.

4.1 Choice Of Fluid

The selection of an appropriate intravenous fluid is a critical aspect of patient management. 0.9% normal saline (NS) continues to be the most frequently prescribed fluid in many healthcare settings due to its widespread availability and familiarity among clinicians. However, emerging evidence increasingly supports the use of balanced crystalloids, such as Ringer’s Lactate and Plasma-Lyte, owing to their closer physiological composition and improved safety profile¹².

Excessive administration of normal saline has been linked to hyperchloremic metabolic acidosis, impaired renal perfusion, and an increased risk of acute kidney injury¹?. Despite this, the transition toward balanced solutions remains inconsistent, highlighting a gap between evidence and clinical practice.

 4.2 Volume And Rate Of Administration

Determining the correct volume and infusion rate of intravenous fluids is essential to achieving optimal therapeutic outcomes. Errors in this domain are among the most commonly reported prescribing issues. Both under-resuscitation and over-resuscitation can have serious consequences, including tissue hypoperfusion, organ dysfunction, or fluid overload¹?.

In many cases, fluid prescriptions are not adequately individualized and may not account for patient-specific factors such as age, comorbidities, renal function, or ongoing fluid losses. Lack of continuous reassessment further exacerbates these problems.

 4.3 Indication-Based Prescribing

A rational approach to intravenous fluid therapy requires clear identification of the clinical indication, which is typically categorized into:

1. Resuscitation – rapid restoration of intravascular volume in critically ill patients
2. Maintenance – provision of daily fluid and electrolyte requirements
3. Replacement – correction of ongoing losses (e.g., vomiting, diarrhoea, drains)

However, clinical studies indicate that these categories are frequently overlooked or poorly differentiated in practice, resulting in inappropriate prescribing decisions¹?. Failure to align fluid therapy with its intended purpose often leads to suboptimal patient management.

4.4 Departmental Variations In Prescribing

Prescribing patterns may vary significantly across hospital departments such as intensive care units (ICUs), general medicine wards, and surgical units. For instance, ICU settings may demonstrate more adherence to protocol-based fluid management, whereas general wards often exhibit inconsistent practices due to limited monitoring and oversight¹?. These variations highlight the importance of standardized institutional protocols.

 4.5 Factors Influencing Prescribing Patterns

Several factors contribute to variability in IV fluid prescribing, including:

1. Level of clinician experience
2. Availability of institutional guidelines
3. Clinical workload and time constraints
4. Lack of structured training programs
5. Inadequate documentation systems

Addressing these factors is crucial for improving prescribing accuracy and patient safety.

5. COMMON PRESCRIBING ERRORS

Inappropriate intravenous fluid therapy remains a significant concern in clinical practice, with multiple studies identifying recurrent prescribing errors that can compromise patient safety¹?. These errors are particularly prevalent among junior doctors and trainees, often due to insufficient clinical training and limited supervision¹?.

Common Errors Include:

1. Selection of inappropriate type of fluid for the clinical condition
2. Incorrect calculation of fluid volume or infusion rate
3. Failure to perform adequate initial patient assessment
4. Inadequate monitoring of electrolytes and fluid balance
5. Poor or incomplete documentation of fluid therapy

These issues collectively contribute to complications such as fluid overload, electrolyte disturbances, and increased morbidity.

Table 2: Common Errors in IV Fluid Prescribing and Clinical Impact