Deficit Equation

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Make greater investments in young children to see greater returns in education, health and productivity.

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Hypokalemia is one of the most common water-electrolyte imbalances and affects about 20% of patients admitted to the hospital medical surgical services and about 40% of patients admitted to intensive care units.

The most common causes of hypokalemia defined as a level below 3.5mEq/L (3.5 mmol/L) include vomiting, diarrhea, hypomagnesemia,diuretics such as furosemide, hyperaldosteronism, and less commonlyinadequate intake. Normal potassium levels are between 3.5 and5.0 mEq/L. Mildly low potassium levels (3.0 to 3.5 mEq/L)typically do not cause symptoms, however, may lead to increases inblood pressure and provoke the development of an abnormal heartrhythm. Moderate hypokalemia (serum potassium levels of 2.5 to 3 mEq/L (2.5 -3.0 mmol/L), may cause muscle weakness, tiredness, myalgia, tremor,muscle cramps, and constipation. Severe deficits leading toserum potassium levels below 2.5 mEq/L may be life-threatening andlead to electrocardiographic(ECG) changes such as QRS prolongation, ST-segment and T-wave depression,andU-wave formation. The earliest (ECG) findings in patients withhypokalemia are decreased T waveheight, followed by ST depressions and T inversions as levelscontinue to fall.

A rough estimate for calculating maintenance calories for a moderately active person is multiplying body weight in pounds by 15 (you roughly need 15 calories per pound of your body weight to maintain your current weight).

BMR is the number of calories needed to maintain basic life-sustaining functions, such as breathing, maintaining blood pressure, and digesting food. One popular formula for calculating BMR is the Harris-Benedict formula. According to this formula:

So, if your TDEE is 2,000 calories, eating 1,500 calories a day for 7 days may help you achieve a weight loss of 1 pound a week as long as you keep your daily activities consistent. Increased physical activity means more weight loss.

Calories have two outcomes: either they are used for work and body functioning, or the excess calories get stored primarily as body fat. If you consume more calories than you use, you are bound to gain weight no matter what type of diet you follow.

It is generally considered to be a caloric deficit to consume 1200 calories per day if you are trying to lose weight. A caloric deficit occurs when you burn more calories than you consume (TDEE of 2000 calories), which can promote weight loss.

The recommended rate of sodium correction is 0.5 mEq/h or as much as 10-12 mEq/L in 24 hours. [11] Dehydration should be corrected over 48-72 hours. If the serum sodium concentration is more than 200 mEq/L, peritoneal dialysis should be performed using a high-glucose, low-sodium dialysate.

Body water deficit may be calculated. The equations used are based on a goal of plasma sodium concentration of 145 mEq/L. In children, total body water (TBW) is 60% of their lean body weight. Therefore, TBW = 0.6 X weight. Babies are an exception to these equations and may have a TBW as much as 80% of their body weight.

In cases of associated hyperglycemia, 2.5% dextrose solution may be given. Insulin treatment is not recommended because the acute decrease in glucose, which lowers plasma osmolality, may precipitate cerebral edema.

Consultation is also recommended for patients with renal dysplasia, medullary cystic disease, reflux nephropathy, or polycystic disease. Consider obtaining consultations with the following specialists:

Ewa Elenberg, MD, MEd Associate Professor of Pediatrics, Renal Section, Texas Children's Hospital, Baylor College of Medicine

Ewa Elenberg, MD, MEd is a member of the following medical societies: American Society of Nephrology, American Society of Pediatric Nephrology

Disclosure: Nothing to disclose.

Muthukumar Vellaichamy, MD, FAAP Clinical Assistant Professor, Department of Pediatrics, Wesley Medical Center, University of Kansas School of Medicine-Wichita

Muthukumar Vellaichamy, MD, FAAP is a member of the following medical societies: American Academy of Pediatrics, Society of Critical Care Medicine

Disclosure: Nothing to disclose.

Mary L Windle, PharmD Adjunct Associate Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Nothing to disclose.

Barry J Evans, MD Assistant Professor of Pediatrics, Temple University Medical School; Director of Pediatric Critical Care and Pulmonology, Associate Chair for Pediatric Education, Temple University Children's Medical Center

Barry J Evans, MD is a member of the following medical societies: American Academy of Pediatrics, American College of Chest Physicians, American Thoracic Society, Society of Critical Care Medicine

Disclosure: Nothing to disclose.

Timothy E Corden, MD Associate Professor of Pediatrics, Co-Director, Policy Core, Injury Research Center, Medical College of Wisconsin; Associate Director, PICU, Children's Hospital of Wisconsin

Timothy E Corden, MD is a member of the following medical societies: American Academy of Pediatrics, Phi Beta Kappa, Society of Critical Care Medicine, Wisconsin Medical Society

Disclosure: Nothing to disclose.

G Patricia Cantwell, MD, FCCM Professor of Clinical Pediatrics, Chief, Division of Pediatric Critical Care Medicine, University of Miami Leonard M Miller School of Medicine/ Holtz Children's Hospital, Jackson Memorial Medical Center; Medical Director, Palliative Care Team, Holtz Children's Hospital; Medical Manager, FEMA, South Florida Urban Search and Rescue, Task Force 2

G Patricia Cantwell, MD, FCCM is a member of the following medical societies: American Academy of Hospice and Palliative Medicine, American Academy of Pediatrics, American Heart Association, American Trauma Society, National Association of EMS Physicians, Society of Critical Care Medicine, Wilderness Medical Society

Disclosure: Nothing to disclose.

Hyponatremia is a common electrolyte disturbance frequently requiring fluid administration for correction to physiologic levels. Rapid correction can be dangerous for patients, leading to cerebral edema and osmotic demyelination among other complications.1 Determining a safe rate of fluid administration to prevent these issues relies on patient and fluid variables. The majority of cases of osmotic demyelination were originally thought to have taken place with daily sodium correction of greater than 12 mmol/L/day (0.5 mmol/L/hr); however, many experts advocate for a more conservative approach to correction, targeting 4-6 mmol/L/day with a maximum of 8 mmol/L/day.2

This calculator specifically addresses the total sodium deficit for a patient considering their total body water (TBW) alongside current and desired serum sodium levels. The calculation used for TBW is simplified, however many more complex equations integrating age and height exist in the literature.

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The status of the soil water for an irrigated crop needs monitoring regularly to assist the irrigation manager in making irrigation decisions. Typically, irrigation scheduling can be done in two ways. One is by directly monitoring soil-water by using soil moisture sensors. The other way is to use weather data to account for soil-water in the rooting depth by soil-water balance approach. This method is usually referred to as weather-based or evapotranspiration (ETc) - based irrigation scheduling or water balance method.

Estimating soil water using the water-balance approach is done by accounting for all the incoming and outgoing water from the soil root zone (Figure 1). Major inputs include precipitation (P) or rainfall and irrigation (Irr). Outputs include ETc, runoff (R) and deep percolation (DP). Daily soil water depletion in the rooting zone is calculated using the equation below:

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