{"id":3523,"date":"2019-11-28T14:09:50","date_gmt":"2019-11-28T14:09:50","guid":{"rendered":"http:\/\/edren.org\/ren\/education\/textbook\/fluid-therapy\/fluid-case-2\/"},"modified":"2019-12-20T15:52:39","modified_gmt":"2019-12-20T15:52:39","slug":"fluid-case-2","status":"publish","type":"page","link":"https:\/\/edren.org\/ren\/education\/textbook\/fluids-and-electrolytes\/fluid-therapy\/fluid-case-2\/","title":{"rendered":"Fluid case 2"},"content":{"rendered":"<p>Use the principles described in <a href=\"http:\/\/edren.org\/ren\/education\/textbook\/fluids-and-electrolytes\/fluid-therapy\/\">Fluids basics<\/a> to approach this problem logically. Go back to those pages to look things up when necessary.<\/p>\n<hr \/>\n<p><span style=\"color: #993300;\">Three days after her admission, a 43 year old woman with diabetic ketoacidosis has a blood pressure of 88\/46 mmHg &amp; pulse of 110 bpm. Her charts show that her urine output over the last 3 days was 26.5 litres, whilst her total intake was 18 litres.<\/span><\/p>\n<p><strong><span style=\"color: #993300;\">Questions:<\/span><\/strong><\/p>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 100%; background-color: #e6f7ed;\">1. How much fluid does she need to regain a normal blood pressure and make up her losses?<\/p>\n<p>2. What fluids would you use?<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"color: #993300;\"><em><span style=\"color: #993300;\"><strong><span style=\"color: #993300;\">10<\/span> <span style=\"color: #993300;\">marks available.<\/span><\/strong> Read the hints, but write down your answer before clicking to read ours.<\/span><\/em><\/span><\/p>\n<p><strong><span style=\"color: #993300;\">Hints:<\/span><\/strong><\/p>\n<div id=\"q2\" class=\"answer\">\n<div align=\"left\">\n<div id=\"q5\" class=\"answer\">\n<div align=\"left\">\n<div class=\"su-accordion su-u-trim\">\n<div class=\"su-spoiler su-spoiler-style-default su-spoiler-icon-plus su-spoiler-closed\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\"><div class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\"><span class=\"su-spoiler-icon\"><\/span>How to approach the first part of the question (click to expand\/collapse)<\/div><div class=\"su-spoiler-content su-u-clearfix su-u-trim\">\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 100%; background-color: #e6f7ed;\">This is a more complex question but the principles are exactly the same.<\/p>\n<p>Assume that the blood glucose is OK after 3 days in hospital, though this may be an unsafe assumption, as the fluid balance has been screwed up so comprehensively.<\/p>\n<p><strong><span style=\"color: #993300;\">1. Add up the deficit<\/span><\/strong><\/p>\n<ul style=\"list-style-type: disc;\">\n<li>Have you included insensible losses?<\/li>\n<li>Are there any additional losses? (e.g. drains, etc)<\/li>\n<\/ul>\n<p><strong><span style=\"color: #993300;\">2. In considering inputs<\/span><\/strong><\/p>\n<ul style=\"list-style-type: disc;\">\n<li>You only need to replenish the deficit for this question, you are not being asked to go further.<\/li>\n<\/ul>\n<p><strong><span style=\"color: #993300;\">3. <\/span><\/strong><i>Now go back to the question and decide how much fluid to give.<\/i><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div id=\"q2\" class=\"answer\">\n<\/div><\/div>\n<div class=\"su-spoiler su-spoiler-style-default su-spoiler-icon-plus su-spoiler-closed\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\"><div class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\"><span class=\"su-spoiler-icon\"><\/span>How to approach the second part of the question (click to expand\/collapse)<\/div><div class=\"su-spoiler-content su-u-clearfix su-u-trim\">\n<div align=\"left\">\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 100%; background-color: #e6f7ed;\"><strong><span style=\"color: #993300;\">1. In choosing fluids to give and in what order, consider<\/span> <\/strong><\/p>\n<ul style=\"list-style-type: disc;\">\n<li>Much of the negative balance is urine, which is likely to have a low electrolyte content<\/li>\n<li>However consider from the clinical details which compartment(s) need expanding most urgently (<a href=\"http:\/\/edren.org\/ren\/education\/textbook\/fluids-and-electrolytes\/fluid-therapy\/\">revise properties of different replacement fluids<\/a>; or see <a href=\"http:\/\/edren.org\/ren\/handbook\/unithdbk\/fluid-therapy\/\">prescribing guide<\/a>)<\/li>\n<\/ul>\n<p><strong><span style=\"color: #993300;\">2. How much potassium does the patient require?<\/span><\/strong><\/p>\n<div align=\"left\">\n<ul style=\"list-style-type: disc;\">\n<li>In this setting you cannot sensibly guess at the potassium requirement without being told serum potassium values, which are often disturbed in diabetic ketoacidosis.<\/li>\n<\/ul>\n<\/div>\n<p><strong><span style=\"color: #993300;\">3. <\/span><\/strong><i>Now go back to the question and decide how much of each fluid to give.<\/i><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div><\/div>\n<div class=\"su-spoiler su-spoiler-style-default su-spoiler-icon-plus su-spoiler-closed\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\"><div class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\"><span class=\"su-spoiler-icon\"><\/span>Click here to reveal our answer (click to expand\/collapse) <\/div><div class=\"su-spoiler-content su-u-clearfix su-u-trim\">\n<div align=\"left\">\n<div id=\"q6\" class=\"answer\">\n<div align=\"left\">\n<div align=\"left\">\n<p>The hyperglycaemia of diabetic ketoacidosis causes glycosuria which results in an osmotic diuresis. This causes high losses of water and dehydration occurs if fluid balance is not attended to. How to control glucose is not considered here. Potassium disturbances are usual.<\/p>\n<p><strong><span style=\"color: #993300;\">1. Total volume of fluid<\/span><\/strong><\/p>\n<ul style=\"list-style-type: disc;\">\n<li>She has lost 26.5 litres of urine plus at least 1.5 litres insensible losses over the last 3 days; her input has been 18 litres. This equals a deficit of <strong><span style=\"color: #993300;\">10 litres<\/span><\/strong>, and it is not suprising that she appears to be hypovolaemic with hypotension and tachycardia.<\/li>\n<\/ul>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 100%; background-color: #e6f7ed;\"><strong><span style=\"color: #993300;\">Indicative marking scheme: 4 marks for 9.5-10.5 litres; 2 marks for 8-11 litres<\/span><\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong><span style=\"color: #993300;\">2. What should the fluids be? and how should they be given?<\/span><\/strong><\/p>\n<div align=\"left\">\n<ul style=\"list-style-type: disc;\">\n<li>As she has a low BP, we can assume that her blood volume is low, and that organ perfusion is at risk. She therefore needs to be resuscitated with solutions that will expand the intravascular compartment. More on <a href=\"http:\/\/www.edrep.org\/pages\/textbook\/fluid-therapy\/fluid-compartments.php\">fluid compartments<\/a>; or\u00a0<a href=\"http:\/\/edren.org\/ren\/handbook\/unithdbk\/fluid-therapy\/\">fluid therapy guide on resuscitation fluids<\/a>.<\/li>\n<li>As she has lost mainly water, a large part of this should be isotonic glucose, and serum [ Na+ ] should be monitored in order to assess the need for IV saline.<\/li>\n<li>Rate of infusion &#8211; the first couple of litres of fluid could be given very quickly, e.g. in 1-1.5h, next couple over 2-3h, rest more slowly. In a patient with heart disease you may need to be more cautious to prevent pulmonary oedema from overfilling of the intravascular space before fluid diffuses into other compartments.<\/li>\n<\/ul>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 100%; background-color: #e6f7ed;\"><strong><span style=\"color: #993300;\">Indicative marking scheme: 3 marks for appropriate 1000-2000mls resuscitation fluids given quite quickly initially, <i>or<\/i> up to 5 litres of sodium-containing fluids if heavily &#8216;front-loaded&#8217;; PLUS 2 marks if 4-7 litres of 5% glucose or equivalent given.<\/span><\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p><strong><span style=\"color: #993300;\">3. Today&#8217;s requirements? <\/span><\/strong><\/p>\n<ul style=\"list-style-type: disc;\">\n<li><span style=\"color: #000010;\">If you were tackling this problem in real life, you would have to plan today&#8217;s fluids too. However in a situation of this complexity it would be essential to review the patient repeatedly to assess cardiovascular status, urine output, and possibly to check electrolytes before writing up fluids for the next few hours. <\/span><\/li>\n<li><span style=\"color: #000010;\">You should never attempt to predict a whole day&#8217;s output ahead when such large volumes are required. <\/span><\/li>\n<li>In a high-dependency setting where things may be changing, the instruction to give fluids at a rate depending on hourly urine flow can be very helpful, e.g.<\/li>\n<\/ul>\n<\/div>\n<div align=\"center\">\n<table style=\"width: 100%; height: 120px;\" border=\"1\" width=\"80%\" cellspacing=\"0\" cellpadding=\"3\">\n<tbody>\n<tr style=\"height: 24px;\">\n<td style=\"background-color: #e6f7ed; height: 24px;\" bgcolor=\"#212121\" width=\"55%\">\n<div align=\"center\"><strong><span style=\"color: #993300;\">Fluid<\/span><\/strong><\/div>\n<\/td>\n<td style=\"background-color: #e6f7ed; height: 24px;\" bgcolor=\"#212121\">\n<div align=\"center\"><strong><span style=\"color: #993300;\">Rate<\/span><\/strong><\/div>\n<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"height: 24px;\" width=\"55%\">0.9% sodium chloride 500mls<\/td>\n<td style=\"height: 96px;\" rowspan=\"4\"><i>Input per hour = Last hour&#8217;s output + 40 mls<\/i><\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"height: 24px;\" width=\"55%\">5% glucose 500mls <span style=\"color: #ef0000;\">+ 20mmol KCL<\/span><\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"height: 24px;\" width=\"55%\">0.9% sodium chloride 500mls<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"height: 24px;\" width=\"55%\">5% glucose 500mls <span style=\"color: #ef0000;\">+ 20mmol KCL<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div align=\"left\">\n<p>This prevents inadvertently accruing very large deficits or gains (assuming urine is the major source of fluid loss) &#8211; but it is essential to review this type of prescription frequently.<\/p>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 100%; background-color: #e6f7ed;\"><strong><span style=\"color: #993300;\">Maximum marks for this question 10; pass mark 6<\/span><\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Use the principles described in Fluids basics to approach this problem logically. Go back to those pages to look things up when necessary. Three days after her admission, a 43 year old woman with diabetic ketoacidosis has a blood pressure of 88\/46 mmHg &amp; pulse of 110 bpm. Her charts\u2026<\/p>\n<p> <a class=\"continue-reading-link\" href=\"https:\/\/edren.org\/ren\/education\/textbook\/fluids-and-electrolytes\/fluid-therapy\/fluid-case-2\/\"><span>Continue reading<\/span><i class=\"crycon-right-dir\"><\/i><\/a> <\/p>\n","protected":false},"author":2,"featured_media":0,"parent":3449,"menu_order":96,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_lmt_disableupdate":"","_lmt_disable":"","footnotes":""},"class_list":["post-3523","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/edren.org\/ren\/wp-json\/wp\/v2\/pages\/3523","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/edren.org\/ren\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/edren.org\/ren\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/edren.org\/ren\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/edren.org\/ren\/wp-json\/wp\/v2\/comments?post=3523"}],"version-history":[{"count":29,"href":"https:\/\/edren.org\/ren\/wp-json\/wp\/v2\/pages\/3523\/revisions"}],"predecessor-version":[{"id":3837,"href":"https:\/\/edren.org\/ren\/wp-json\/wp\/v2\/pages\/3523\/revisions\/3837"}],"up":[{"embeddable":true,"href":"https:\/\/edren.org\/ren\/wp-json\/wp\/v2\/pages\/3449"}],"wp:attachment":[{"href":"https:\/\/edren.org\/ren\/wp-json\/wp\/v2\/media?parent=3523"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}