수액의 종류와 기능

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1. H/S (Hartmann's Solution / Ringers Lactate)

우리 몸에 필요한 나트륨, 칼륨, 칼슘 등이 포함된 수액제로, 체액과 유사한 성질을 가지고 있습니다. 링겔주사라고도 불리며, 장 수술 중 부족하기 쉬운 중탄산염을 보충합니다. 설사로 인한 전해질 손실, 등장성 탈수, 화상 시 투여되며, 수술에서 주로 사용되고 응급 시 혈압 상승에 효과적입니다. 다만 칼슘과 결합하여 약물 효과를 떨어뜨릴 수 있습니다.
2. N/S (Normal Saline) 0.9% NaCl

순수한 염화나트륨만 포함한 수액으로, 혈액의 삼투압과 같아 급성 출혈이나 심한 탈수 시 혈장량 보충에 사용됩니다. 가장 기본이 되는 수액으로, 수분과 전해질 결핍 시 보급되며 주사제의 용해 희석제로도 사용됩니다. 출혈로 혈압이 급격히 떨어질 때 빠른 속도로 주입되지만, 대량 투여 시 대사성 산증이 생길 수 있어 혈압 안정 후 H/S로 변경합니다.
3. D/W (Dextrose Water)

포도당이 포함된 수액으로 열량을 공급하는 효과가 있습니다. 기본은 5% 포도당이며, 다른 약물과 혼합 시 약물을 세포 내 공간으로 끌어들여 약효를 빨리 볼 수 있습니다. 열이 나는 환자의 에너지 소모와 탈수를 고려하여 사용되며, 고농도 D/W는 주사 부위 통증을 유발하므로 천천히 투여합니다.
4. 5% D/W와 10% D/W의 임상 적용

5% D/W는 1리터에 포도당 50g이 포함되어 있으며, 칼로리 보급과 단백질 절약 작용을 합니다. 심부전, 폐부종 환자에게 사용되며 포도당은 혈청 칼륨치를 저하시켜 고칼륨혈증 치료에 활용됩니다. 10% D/W는 저혈당 환자나 숙취 해소 시 사용되며, 당뇨 환자의 저혈당증 치료 시 인슐린과 혼합하여 사용합니다.

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1. H/S (Hartmann's Solution / Ringers Lactate)

Hartmann's solution is an excellent crystalloid fluid for resuscitation and maintenance therapy in clinical practice. Its balanced electrolyte composition closely mimics plasma, containing sodium, potassium, calcium, chloride, and lactate, which makes it physiologically superior to normal saline. The lactate component is metabolized by the liver to bicarbonate, providing a buffering effect that helps prevent metabolic acidosis. This makes it particularly valuable in trauma, sepsis, and major surgery cases where fluid shifts are significant. The presence of potassium and calcium helps maintain normal cellular function and cardiac stability. While slightly more expensive than normal saline, the clinical benefits justify its use, especially in critically ill patients where avoiding hyperchloremic acidosis is important. It remains my preferred choice for initial resuscitation in most clinical scenarios.
2. N/S (Normal Saline) 0.9% NaCl

Normal saline is a fundamental and widely available crystalloid solution that serves as a reliable baseline fluid for many clinical situations. Its simplicity, stability, and cost-effectiveness make it indispensable in emergency and routine medical practice. However, it has notable limitations that clinicians should recognize. The high chloride concentration (154 mEq/L) can lead to hyperchloremic metabolic acidosis with large-volume administration, potentially worsening outcomes in critically ill patients. Despite these drawbacks, normal saline remains appropriate for initial stabilization, maintenance therapy in minor procedures, and situations where balanced solutions are unavailable. Its universal availability and familiarity among healthcare providers ensure its continued use. Nevertheless, for major resuscitations and prolonged fluid therapy, balanced crystalloids like Hartmann's solution are generally preferable to minimize complications.
3. D/W (Dextrose Water)

Dextrose water solutions serve specific clinical purposes but require careful consideration regarding their appropriate use. While dextrose provides calories and can help prevent hypoglycemia, pure dextrose water is hypotonic and distributes throughout total body water, making it unsuitable for resuscitation or maintaining intravascular volume. It can cause dangerous hyponatremia and cerebral edema if administered in large quantities, particularly in patients at risk for increased intracranial pressure. Dextrose water is best reserved for maintenance therapy in patients with adequate oral intake or for providing minimal caloric support in specific situations. In acute resuscitation scenarios, it should be avoided entirely. The use of dextrose-containing solutions requires careful monitoring of serum glucose and sodium levels, especially in critically ill patients where metabolic derangements are common.
4. 5% D/W와 10% D/W의 임상 적용

The choice between 5% and 10% dextrose water depends on specific clinical needs and patient conditions. Five percent dextrose water is slightly hypertonic and provides approximately 50 grams of dextrose per liter, making it suitable for maintenance therapy and mild caloric supplementation. It's commonly used in perioperative settings and for patients requiring modest glucose support. Ten percent dextrose water is more concentrated, providing 100 grams of dextrose per liter, and should be administered through central lines due to its hypertonic nature and potential for phlebitis. It's reserved for situations requiring higher caloric delivery or severe hypoglycemia management. Both solutions carry risks of hyperglycemia, osmotic diuresis, and hyponatremia with excessive use. Clinical application should be guided by careful assessment of fluid and glucose requirements, with preference for balanced crystalloids in resuscitation scenarios and dextrose solutions limited to specific maintenance or supplemental roles.

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