Warming IV Fluids and Incidence of Hypotension

Study Overview
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Brief Summary
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This prospective, double-blinded, randomized, controlled study was undertaken to evaluate whether warming IV fluids (37 oC) resulted in lower incidence of hypotension, less ephedrine and transfusion requirement and lower fluid consumption than use of room-temperature fluids (22 oC) in cesarean delivery patients undergoing spinal anesthesia.

Detailed Description
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Inadvertent perioperative hypothermia during cesarean delivery is not rare and frequently neglected, despite the recommendations by clinical guidelines. Exposure to cold air and infusing non-warmed intravenous (iv) fluids are the other main sources of inadvertent hypothermia. Spinal anesthesia used during the cesarean delivery has also been demonstrated to impair normal autonomic thermoregulatory control and extend inadvertent perioperative hypothermia. Various measures such as pre-warming of patients or fluids before anesthesia, peroperative warming of iv fluids and active/passive cutaneous warming techniques have all been used to prevent or to reduce inadvertent perioperative hypothermia. This prospective, double-blinded, randomized, controlled study was undertaken to evaluate whether warming IV fluids (37 oC) resulted in lower incidence of hypotension, less ephedrine and transfusion requirement and lower fluid consumption than use of room-temperature fluids (22 oC) in cesarean delivery patients undergoing spinal anesthesia. The hypothesis was that in elective caesarean delivery patients undergoing spinal anesthesia, warming intravenous fluids, would reduce the incidence of hypotension, ephedrine and transfusion requirement and volume consumption. Thus, the primary outcome measure of the present study was the incidence of intraoperative maternal hypotension and ephedrine requirement during spinal anaesthesia for caesarean section. Secondary outcome measures were total volume consumption, blood loss, pain scores, shivering and maternal and foetal side effects.

Official Title
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Do Warming iv Fluids During the Management of Spinal- Induced Hypotension Decrease the Incidence of Hypotension and Reduce the Requirement of Fluid, Blood and Ephedrine?

Conditions
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Assault by Hot Fluids

Intervention / Treatment
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* Other: Active Comparator: Warming group


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Inclusion criteria were previous cesarean delivery and breech presentation. Exclusion Criteria: Exclusion criteria included parturients younger than 18 and older than 43 years, significant coexisting disease such as preeclampsia or eclampsia, thyroid disorders, neurological disorders, increased risk of intra-operative hemorrhage (such as placenta accreta), and any contraindication to regional anaesthesia such as bleeding disorders or local infection.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 43 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Warming group<br>Active Comparator: Warming group | Other: Active Comparator: Warming group<br>* Placebo Comparator: Control group<br>|
| Placebo Comparator: Control group<br>Control group | Other: Active Comparator: Warming group<br>* Placebo Comparator: Control group<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| The primary outcome measure of the present study was the incidence of intraoperative maternal hypotension and ephedrine requirement during spinal anaesthesia for caesarean section | Systolic and diastolic blood pressures (mmHg) and Ephedrine and transfusion requirement (n /mg) | 6 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Secondary outcome measures were total volume consumption. | Total volume consumption (mL), | 6 months | 
| Secondary outcome measures were pain scores | Pain scores (VRS), | 6 months | 
| Secondary outcome measures were shivering and maternal and foetal side effects. | side effects such as shivering, nausea, vomiting, bradycardia, hypoxia (y/n) | 6 months |