An Interview with Dr. John Laragh
Director of the Cardiovascular Center at the
New York Presbyterian Hospital-Cornell Medical Center and Weill Medical College and
Editor-in-Chief of the American Journal of Hypertension
By Paul J. Rosch, MD, F.A.C.P.
People with uncontrolled high blood pressure are:
3 times more likely to develop coronary heart disease
6 times more likely to develop congestive heart failure
7 times more likely to have a stroke
Despite over one hundred antihypertensive drugs that have been approved as being safe and effective, the sad fact is that we have not been very successful in controlling hypertension. A survey reported in the July 9 issue of The Journal of the American Medical Association found that nearly one in three U.S. adults have hypertension. Of the estimated 58 million affected, “almost 30% were unaware of their illness, 42% were not being treated, and at the time that their BP was measured, 69% did not have their hypertension controlled!”
John Laragh And The Renin Hypothesis
How The Renin Story Began And Evolved
PJR:What led to your interest in renin?
JHL: At Columbia, as an intern and resident in medicine and then in cardiology I was surrounded by frontier clinical science, the direct product of Robert Loeb’s passion for new knowledge and its basic link to clinical excellence. Loeb spawned many professors of medicine, but what is generally not known is that his department also produced 6 Nobel Laureates including Dickinson Richards, André Cournand, Barry Blumberg, Dan Nathan and Carleton Gajdusek, an incredible record. For about 10 years I used to meet with Loeb almost daily at 8 AM in his office along with other house staff and young faculty members. With his help and advice I was working on congestive heart failure, and on the roles of sodium and potassium balance on edema formation and especially on aldosterone secretion, soon after its discovery in 1953. After he became interested in my work he couldn’t get enough of it, and sometimes would come back to my lab in the afternoons for a second round! I also worked a bit and talked a lot with Marcel Goldenberg, a marvelous scientist whose lab was near mine. Marcel discovered noradrenalin in the adrenal medulla and defined its differences from adrenalin. To block its biosynthesis, he introduced alpha methyl DOPA (Aldomet) to Merck. Marcel fits into my story too, because I was also his physician. He died of renin caused malignant hypertension due to scleroderma. We could have easily saved him today but all this occurred before we had figured out what causes malignant hypertension and had introduced the antirenin R drugs to correct it.
What first led to my interest in renin was a 57-year-old CEO of a large company that Loeb had referred to me in 1957. He had malignant hypertension with grade III retinopathy and generalized muscle weakness from very low serum potassium levels. His aldosterone secretion was over 800 mgm/day while our normal values were less than 50. We were very proud of our aldosterone assay even though it could take up to 6 weeks to complete a test since it required labeling aldosterone with radioactive H3 and then injecting a tracer I.V. into our patients and ourselves. The degree to which the radioactivity was diluted by the amount of aldosterone in the patient’s own blood in 24 hours gave us the daily secretory rate. Unlike everybody else, we found aldosterone to be quite normal in essential hypertension. But, to our amazement, it was massively increased in fatal malignant hypertension. We removed the adrenals in 4 such patients to eliminate all plasma aldosterone but it was without any benefit, since they all died on schedule.
Thus, we showed that malignant hypertension and its diffuse vasculitis were not caused by their high aldosterone since this fatal condition progressed in the absence of the adrenals when there was no aldosterone. There had to be something else circulating in these patients that (1) raised blood pressure, but most importantly, this substance should also (2) produce prompt and progressive injury to blood vessels in the heart, brain and kidneys resulting in the rapidly fatal heart attack, stroke, heart or kidney failure typical of malignant hypertension. Because adrenalectomy did not help, it was obviously not anything manufactured in the adrenal so the most likely cause appeared to me to be excess renin from the severely damaged kidneys of these patients.
In 1898, Tigerstedt and Bergman had published a classic article in a Scandinavian journal describing an amazing and powerful blood pressure raising substance they had isolated from saline rabbit kidney extracts. They called this substance renin. But subsequent scientists failed to confirm Tigerstedt and Bergman’s findings so there was little interest in renin until 1934 when Harry Goldblatt published the landmark results of his dog experiments. Harry induced what appeared to be the equivalent of essential hypertension in humans by constricting either one or both renal arteries with a silver clamp. In addition, more severe renal ischemia produced in this fashion resulted in a syndrome that closely simulated malignant hypertension that was also assumed to be due to more increased renin release. It was therefore very disappointing that numerous attempts showed absolutely no evidence that plasma renin levels were increased in patients with essential hypertension compared to normal people or even that renin had any significant physiologic action of its own in humans.
The Pivotal Role Of Angiotensin
PJR:Why is renin so important if it is inactive?
JHL: What was established by Braun-Menendez was that renin acted enzymatically on a circulating plasma protein (angiotensinogen) to release an inactive decapeptide (angiotensin I), discovered by Leonard Skeggs. He showed that this is rapidly hydrolyzed by “converting enzymes” to form the most powerful pressor substance known, the octapeptide angiotensin II. It is this vasoconstrictor angiotensin II, released in plasma only by renin, which plays the crucial role in causing most human hypertension and its fatal sequelae. When you give angiotensin II to normal humans we showed that it produces a rapid rise in blood pressure by promoting vasoconstriction as well as via a slower and more sustained elevation by also stimulating aldosterone secretion to promote body sodium retention by acting on the kidneys. However, it was many years before these normal roles of plasma renin or angiotensin would finally be acknowledged and much longer still before the establishment began to accept renin as a major cause of human malignant and essential hypertensions. In fact, there are some establishment diehards who will probably go to their graves resisting renin.
Thus, in 1958, when we discovered very high plasma aldosterone levels in fatal malignant hypertension, the octapeptide, angiotensin II, had just been synthesized by CIBA. They provided samples to us for human research. We cautiously administered tiny subpressor amounts of it intravenously to six normal volunteers. In over 40 such infusion studies, only angiotensin II (but never adrenalin, noradrenalin, serotonin or vasopressin) consistently and strikingly stimulated adrenal aldosterone secretion. Thus, we had discovered the missing biologic role for renin. It was to maintain normal ambulatory blood pressures not only via direct angiotensin II arteriolar vasoconstriction but also by angiotensin induced adrenal aldosterone release. Aldosterone then acts to expand blood volume and flow by causing the kidneys to retain sodium and thus water.
PJR:How did this information help you target drug treatments to specific hypertensive patients?
JHL: The new data and our studies led us to propose and later prove that the malignant hypertension syndrome is caused by an unchecked runaway release of renin by the damaged kidneys, leading to very high plasma angiotensin levels. This raises blood pressure and also constricts the coronary, cerebral and renal vessels, rapidly leading to fatal complications like heart attacks and stroke. We were able to correct all of this syndrome in malignant hypertension patients not only by removing both kidneys, but also by treating each such patient instead with any one of the 3 antirenin R drug types that we characterized and introduced: first propranolol, a beta blocker, to block the kidney beta receptor renin release, then, the snake venom peptide (teprotide), the original intravenous angiotensin converting enzyme (ACE) inhibitor, and finally, the intravenous octapeptide saralasin, the first angiotensin II receptor blocker (ARB). Our findings with teprotide and saralasin soon persuaded industry to synthesize many orally active analogs of the venom ACE inhibitor (e.g. captopril, enalapril, lisinopril) and later on, many orally active ARB’s resembling saralasin (e.g. losartan, valsartan, cardesartan, olmesartan, irbesartan, telmisartan, eprosartan).
As you know, these explicit antirenin system R drugs, together with beta blockers, another antirenin R drug class that we defined, have had a dramatic influence on our understanding and treatment of all human hypertension. And they have had an even greater impact for preventing or arresting the plasma renin-caused fatal consequences, notably heart attack, stroke, heart and kidney failure. These three classes of antirenin R drugs that we introduced and characterized are now represented for clinical use world wide by numerous commercially available chemical analogs, e.g. captopril, lisinopril, enalapril, ramipril. Collectively, they have revolutionized not only hypertension therapy but also its major fatal cardiovascular complications.
Marcel Goldenberg was one of my malignant hypertension patients whose rapidly fatal outcome proved this entire story for us. I cry whenever I think about him because five years later we could have saved him. We then went on to prove that about 2 out of 3 cases of essential hypertension are caused and sustained by their plasma renin levels because blocking renin with one of our antirenin drugs promptly corrects them. In these patients too, we could also prevent the same but more gradually developed fatal sequelae of heart attacks, stroke, heart failure and kidney failure with any one of our three antirenin drug types. However, these R drugs do not benefit patients with low renin hypertension who, on the other hand, respond incredibly well to the natriuretic (V) drugs (thiazides, spirolactone, calcium channel blockers) that reduce body sodium and thus blood volume.
The Plasma And Direct Renin Assays
PJR:The key to your treatment method appears to be the ability to measure plasma renin activity accurately. The difficulty that most physicians had was that this measurement was quite complicated because it required incredible sensitivity and thus not widely available, as well as being expensive, since unlike today, it was not covered by health insurance. Paul Brown, who had founded Metpath Laboratories, was a good friend and I recall taking you over to New Jersey around 25 years ago to meet him. Metpath was well on its way to becoming the largest clinical laboratory in the U.S. and since I served as a consultant at the time, I wanted to explore the possibility of providing renin testing as part of a hypertension profile. Nothing apparently came of that but Corning later acquired Metpath, which subsequently became Quest Laboratories. Quest now offers an automated ambulatory direct Renin immunoassay. Is this procedure as accurate as the Sealey-Laragh plasma renin activity assay?
JHL: I remember our visit with Paul Brown quite well. You were on the right track then, and as usual, a little ahead of the curve. Jean Sealey joined our laboratory in 1960 as a biochemist. She soon showed us how our aldosterone assay could be improved. Then, over the next ten years, Jean worked with us to perfect the world’s most sensitive and accurate plasma renin activity assay (PRA). She also worked in Harry Goldblatt’s lab for several months to learn his 12 step human renin purification procedure, which gave us a very valuable reagent to use.
All of the previous renin assays were also inaccurate because they didn’t recognize and reference the level of renin activity to the current state of sodium balance or achieve angiotensinase inhibition or pH control, and because they were not aware of the distorting effect of cryoactivated prorenin. Jean showed that previously unrecognized large amounts of prorenin occur in human plasma and are converted to active renin in vitro when plasma or blood is exposed to cold temperatures. This was why most labs that routinely chilled their plasma samples had very high false results. As a result, they were unable to measure low renin accurately that is critical for identifying and separating the low renin “salt” hypertension patients. During this period, although there were constant criticisms and objections to my renin hypothesis, nobody ever questioned the superior accuracy of our testing procedure. Our renin assay remains the only method that can accurately measure the low values, and is absolutely crucial since it is the only way to positively identify and separate out the salt-volume “V” patients whose low renin hypertension is caused instead by salt and requires a different treatment using anti salt drugs instead of the antirenin R drugs that correct the renin type of hypertensives.
Quest has been using our Sealey-Laragh method for the past 7-8 years in their New Jersey laboratory. They confirmed our results, but unfortunately our plasma renin activity (PRA) method proved too skilled-labor intensive for them to put into a mass production mode. Recently, we have helped them to switch to their automated Direct Renin test. While the current Quest-Nichols chemiluminescence Direct Renin assay is much better than all of its preceding competitors, it is still not as sensitive as our PRA procedure for defining and discriminating the low renin salt-volume caused hypertensive patients. However, we are hopeful, since recent comparisons with our assay show that the Quest Direct Renin assay is improving. Most people don’t appreciate that plasma renin activity (PRA) levels can be high enough to produce a fatal stroke at one ten billionth of the molar concentrations of plasma glucose or cholesterol! This is why very sophisticated detection technology amenable to mass production is required. The pivotal values for these two procedures are shown below.
|(V) Volume Hypertension||(R) Renin Hypertension|
|PRA levels less than 0.65 ng/m/hr||PRA levels greater than 0.65 ng/m/hr|
|Direct Renin less than 5 mU/ml||Direct Renin greater than 5 mU/ml|
|This is predominantly sodium-volume
|This is predominantly due to renin-angiotensin caused vasoconstriction|
Measuring renin allows you to identify which type of antihypertensive medication is most likely to be effective and possibly safer in any given patient. The advantage here is that once this is established it is possible for patients to have their blood pressure controlled with one drug permanently. Monotherapy for life is our nirvana for hypertension treatment. We seek this for every patient and achieve it in most.
Treating Volume Versus Renin Hypertension
PJR:How are specific medications selected based on renin profiling and how can treatment be initiated if renin testing is not readily available? This information is elegantly explained in your recent book1but could you give us a brief summary?
JHL: Yes, salt-volume (V) hypertension is always associated with the lower ambulatory plasma renin levels (PRA values less than 0.65). This occurs in about a third of patients with high blood pressure. It is correctly treated with any one of the natriuretic or anti-volume V drugs such as spirolactone, a thiazide diuretic, a calcium channel blocker or an alpha blocker. Renin-angiotensin (R) mediated vasoconstrictor hypertension is twice as common. It resembles a forme fruste of fatal malignant hypertension and is thus much more apt to be associated with albeit milder, and more gradually occurring, fatal heart attacks, strokes, heart failure or kidney failure. These (R) hypertension patients should instead be treated primarily with any one of the three types of antirenin R drugs, an angiotensin converting enzyme inhibitor (ACE), angiotensin receptor blocker (ARB) or a beta blocker. The bottom line is that blood pressures for all hypertensives can be controlled with the Laragh Method using one drug for life in over half of both (V) and (R) patients, or in sum, for at least 60 -80% of the total group. As you noted, this is in sharp contrast to the expensive and unpleasant polypharmacy approach promoted by JNC-VII. The result is that most patients treated using their protocols are denied the precious opportunity for a lifetime of monotherapy with the correct drug type for them but are condemned instead to taking 2-4 drugs. This increases costs and side effects while providing much less net benefit, which means a diminished productive life and an earlier demise.
It is also possible to bypass renin testing by using single file trials of a V and then an R drug to identify which type will correct the hypertension. In addition, I believe you must stop drugs that don’t work rather than always continuing drugs you have on board as JNC-VII mandates. In our method, about 20% of the whole may need both a V and an R drug but that’s still highly preferable to the JNC-VII protocol that starts with a thiazide diuretic and keeps piling on other drugs until blood pressure is controlled. Since diuretics are not only not indicated but can also raise pressure in the 2 out of 3 patients with high renin R hypertension, most of these will have to keep adding other drugs only to achieve poorer results.
PJR:I would suspect that placing everyone on diuretics perpetually would lead to potassium depletion, cardiac arrhythmias and a significant increase in diabetes. It could also deny high renin patients protection from fatal cardiovascular complications that you have shown antirenin medications do provide for them.
JHL: You are absolutely correct and what is both impressive and alarming is the under appreciated harm that can result from traditional diuretic therapy. The thiazide diuretic, hygroton, produced over an 11% incidence of real and permanent diabetes in less than 5 years in the ALLHAT trial, which suggests at least 22% after 10 years and even more later on. In other studies, thiazides have been shown to regularly produce muscle potassium and magnesium depletion that leads to cardiac arrhythmias, muscle weakness, electrocardiographic changes and thence to fatal cardiovascular complications. The good news is that all of these complications can be avoided by using spirolactone instead to correct sodium-volume related hypertension without ever causing diabetes or depletion of potassium and magnesium.
Our renin hypothesis has been widely confirmed in over 120,000 patients who were studied following an acute myocardial infarction in various large clinical trials. Only those receiving an antirenin R drug had a consistent reduction in recurrent myocardial infarction, congestive heart failure and sudden death rates. This shows that blocking the presence or action of angiotensin II by giving an antirenin R drug to this very vulnerable group of patients will consistently prevent plasma renin vasculotoxicity and extend useful life for millions. As emphasized, the R drugs do not help low renin hypertensives, who require and often have dramatic relief from natriuretic V drug salt depletion. Conversely, V drugs are ineffective and often harmful when given to renin mediated R hypertensive patients because this raises renin levels even higher.
Are Government Guidelines Based on Politics Rather Than Science?
PJR: Since others have confirmed your hypothesis and NHLBI has funded your research it is puzzling that renin is not referred to in their official reports. This reminds me of Schopenhauer’s observations about discoveries. “All truth passes through three stages: First, it is ridiculed; Second, it is violently opposed; and Third, it is accepted as self-evident.” Hopefully, the renin story is reaching the end of this trail. New ideas are most often criticized not because they lack merit, but because they might turn out to be workable, which would threaten the reputations and possibly jobs of many people with conflicting opinions. The disastrous results of this are vividly illustrated by the recent NHLBI sponsored ALLHAT study.
JHL: None of the numerous studies that confirm the renin hypothesis are ever quoted by ALLHAT or JNC reports, which is reprehensible. The word renin is rarely or never mentioned, which is like discussing diabetes without ever mentioning the word, insulin! With respect to this ALLHAT report, there were several flaws in the design and implementation of the study that raise serious doubts about the validity of its conclusions and especially their applicability to clinical practice. Over a third of patients were African Americans who are more apt to respond to diuretics because more of their hypertension tends to be volume (salt) related. The participants were all older than 55 (mean age 67) and 36% were diabetic, so it is also doubtful that any conclusions from such an elderly high-risk group would apply to low-risk hypertensives under the age of 55.
Nine out of ten were already receiving some type of antihypertensive drug therapy and there was no washout or medication-tapering period. On day 1 they were switched to one of four blinded randomized drug limbs: diuretic (hygroton), ARB (doxazosin), ACE inhibitor (lisinopril) or calcium channel blocker (amlopidine), so that “baseline” BP was meaningless as a control point for evaluating efficacy. The withdrawal of certain drugs may have caused subsequent adverse events such as heart failure rather than this being due to the new medication as the study authors concluded. The increased incidence of “heart failure” characterized by poorly defined edema in the doxazosin group that led to its discontinuation is particularly puzzling.
It is more likely that “heart failure” resulted from the abrupt cessation of diuretic therapy in those patients who were then placed on comparatively low dosages of this antirenin drug since heart failure has not been a problem in other studies. The timing and pace at which patients were treated with medications were not consistent with good medical practice and potentially dangerous. As explained in our editorial2, many of us would consider failure to achieve effective drug treatment for 6-18 months as overt malpractice. Drug dose titrations were programmed so that no changes at all were made in non-responders until after six months. Although the second drug was again often the wrong one, it still had to be titrated up for the next 9 to 12 months and it was only after 16 months that a step 3 drug was introduced. Consequently, some patients were put at increased risk for complications due to poor or no control of their pressure for a year and a half or more, during which they would likely also suffer from the side effects of increasing dosages of drugs not appropriate for their type of hypertension. I suspect this could lead to significant ALLHAT study malpractice litigation.
According to the trial protocol, if patients did not achieve the goal pressure on a properly titrated dose of the initial study drug, a second and if necessary a third medication could be added, provided it was not one of the study drugs (diuretic, ACE inhibitor or CCB). Physicians could choose from a beta blocker (atenolol) or centrally acting drugs (clonidine and reserpine). A beta blocker was the main drug that was usually added, which obviously would be most beneficial for non responders on a diuretic. Conversely, patients who did not respond to an ACE inhibitor were prevented from receiving a diuretic or CCB and were condemned to receiving still another antirenin drug even though the first one failed. Thus, the design of the study was set up to favor a V drug (hygroton) and, either intentionally or inadvertently, to put an R drug (lisinopril) at a gross disadvantage. The tragedy is that the resulting ALLHAT shaped recommendations are the basis for the new JNC-VII guidelines.
PJR:Quite frankly, it would seem to me that any physician who has not been able to control a patient’s hypertension with medication after an eight or twelve month period of treatment because drug switching was not allowed might be liable for malpractice if that patient had some complication and it could be shown that this might have been preventable by following the Laragh Method. Because of its faulty design, the ALLHAT trial left itself wide open for malpractice litigation and one suit has already been filed. The widow of a 60 year old radiologist who died after being in the study for three-and-one-half years sued the principal investigator at a Pennsylvania hospital as well as his colleagues and the hospital in July, claiming that the dangers of the study had been concealed from her husband when they were trying to convince him to enroll. He had developed some edema or soft tissue swelling during the trial, but his treating physician continued to increase the dose of the blinded drug, which turned out to be the calcium channel blocker, a known cause of edema. When there was a slight blood pressure increase, hydralazine, another drug known to cause edema was prescribed in 1999. According to the complaint, ALLHAT patients were never told of the risk of edema, venous insufficiency, and possibly death from blood clots or bleeding. The swelling worsened and in early 2000, the patient developed lupus, another side effect of hydralazine. Nevertheless, he was kept on the given drugs until days before his death in July 2000. He had also developed an abnormal electrocardiogram, muscle pain, and cataracts, all of which were likely caused by study drugs but either went unreported or uninvestigated as should have been done. In retrospect, he should have been pulled from the trial when there was evidence of kidney damage. The cause of death was a blood clot in his lungs, which the complaint alleged was “a consequence of drug induced lupus and end-stage rapidly progressing kidney damage brought on by the continued ingestion of hydralazine.” The patient, a physician, had rated his health as very good” (90 on a 100-point scale) just before entering the ALLHAT trial.
One claim for superiority of hygroton in ALLHAT was that it reduced the rate of stroke by 15% compared with the ACE inhibitor lisinopril. However, as several critics noted, this could be completely accounted for by the greater stroke rate in black patients given lisinopril who failed to respond and were then put on a beta blocker and then still had significantly higher blood pressures. It is well known that ACE inhibitors or beta blockers are ineffective in low renin hypertension, which is more common in black hypertensives, so that combining 2 antirenin drugs in a low renin patient was inappropriate. I believe you expressed similar concerns in your editorial.
JHL: Very definitely. It is well established that black patients with hypertension are often more likely to respond to diuretics or the other V drugs than to ACE inhibitors or the other R antirenin drugs. The reverse tends to be true in Caucasians and this was also confirmed in ALLHAT. The malpractice issue here is that the nonresponders to lisinopril had to wait 6 months before another drug was added and the only options available for step 2 were still another antirenin drug, either a beta blocker, clonidine or reserpine. Giving another R drug to a patient who already exhibited failure to respond to this type of medication is a no-brainer, not in keeping with widely recommended practices. This second R drug was then titrated up for another 9-12 months, so that a patient who really required a V drug was essentially taking 2 placebos for 16 months. It was only after 16 months that the step 3 drug hydralazine could be started in a still unresponsive patient who had to continue to take the two other drugs that were not working. Thus, patients who were randomized to lisinopril and did not respond were condemned to at least two more redundant and therefore, ineffectual antirenin drugs while being denied effective antivolume drug treatment for well over a year. One can only imagine how frustrating this must have been to treating physicians who recognized this but had to abide by the rules of the trial. With respect to law suits, in all fairness, no matter how well any trial is designed, patients may have unanticipated adverse reactions. The ultimate responsibility lies not only with the trial designers but also with the programming physicians who need to prepare for such situations and place the patients’ interests first instead of those of their government supervisors. As indicated in our editorial in The American Journal of Hypertension2, it would not be an exaggeration to say that I or any one of my colleagues could have accomplished the same drug titrations in four to ten weeks, during which time we would have discarded the medications that obviously did not work. However, such logical and commonly used drug subtractions or substitutions were also strangely barred by the study design, so that by fiat, ALLHAT actually endorsed malpractice.
PJR:This is of great concern since that the latest governmental guidelines for treating hypertension contained in JNC-VII are based on ALLHAT, which brings up another interesting question. Just exactly what is the purpose of this Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure and what authority does it have? The committee grew out of an NIH program to educate the public about the early warning signs and symptoms of hypertension. However, this gradually expanded to include information on the advantages and disadvantages of various medications, and eventually guidelines for their use. The first NHLBI JNC report published in 1976 promoted thiazide diuretics as the preferred drugs for hypertension as did its successors. The 1993 JNC-V guidelines added angiotensin-converting enzyme (ACE) inhibitors and beta blockers as initial therapy choices because of evidence that they were more likely to reduce complications such as heart attacks and stroke. but and only diuretics and beta blockers were approved for first line therapy in the 1996 JNC-VI guidelines. ALLHAT was designed to prove that the government had been correct all along. Although beta blockers were not one of the four types of antihypertensive drugs being compared, they were also dropped as recommended starting medications in JNC-VII, leaving thiazide diuretics to again reign supreme. Thus, according to NHLBI, we apparently have not made any progress in the treatment of hypertension since their first report over 25 years ago.
JHL: Giving a thiazide diuretic to every hypertensive patient is likely to be the wrong choice more than half the time and continuing it despite the fact that it is not effective makes no sense to me. The JNC-VII committee completely failed to acknowledge other large hypertensive trials whose results were available to them but did not support their thiazide first and always recommendations. The ANB2 (Second Australian National Blood Pressure Study) published in the New England Journal of Medicine in February found that ACE inhibitors were associated with 11% lower cardiovascular mortality and complication rates compared to treatment with diuretic agents despite similar blood pressure reductions. During the Australian trial, the diuretic hydrochlorothiazide, was compared with the ACE inhibitor enalapril and patients who did not respond to the first drug were switched to the other, rather than being maintained on something that clearly didn’t work. Two out of three study participants responded to monotherapy with either drug when, according to the trial design, patients who did not respond to the first drug were switched to the other, rather than being maintained on something that clearly didn’t work, again confirming the Laragh Method. At the end of five years, the ACE inhibitor was found to be superior to the thiazide diuretic. I suspect that these findings, which JNC-VII completely ignored, may have more relevance for U.S. clinicians since this population was about 90% Caucasian as opposed to less than two thirds in the ALLHAT study.
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