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Asthma and Cardiac Dyspnea a Differential Diagnosis

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Asthma and Cardiac Dyspnea a Differential Diagnosis September, 1951 199 Asthma and Cardiac Dyspnea A Differential Diagnosis FRANK PERLMAN, M.D., Portland, Oregon nea and wheezing may last minutes to hours; some SUMMARY may, of course, progress to pronounced pulmonary edema and death. The attacks may be infrequent, or There appear to be no infallible guides by they may occur nightly. In the latter case, the which to differentiate between cardiac insuf- patient dreads going to bed and finds that he gets ficiency and asthma as a cause of dyspnea, more rest spending the night in a chair. wheezing and coughing in elderly patients. Patients with asthma, in which the infectious Many of the symptoms of one condition are factor predominates, often have quite similar symp- also symptoms of the other. Even the results toms. They, too, are awakened usually at three or of therapeutic trial cannot be relied upon four o'clock in the morning with dyspnea, wheezing to establish diagnosis, for drugs effective in and coughing, and relief usually follows the raising treatment of heart disease may also help re- of a small amount of tenacious mucus which has lieve asthma, and vice versa. been dislodged by inhalation of the fumes of burn- Although there is no single factor that can ing stramonium leaves or by taking one of the be considered pathognomonic, there are cer- sympathomimetic drugs. They, too, are comfortable tain symptoms and results of tests which are during the day and dread the nights with the recur- more strongly indicative of one condition rence of paroxysms. than of the other. Careful evaluation of all factors, while it may not serve to establish The primary mechanisms by which the symptoms unequivocal diagnosis, will provide a basis in these two disorders develop are quite dissimilar. for judicious treatment of the patient. In the asthmatic patient, the primary changes are concerned with encroachment upon the lumen of the bronchiole, with changes in the musculature and in the subnucosa, with an increase in the num- OFTEN in the case of elderly patients with dysp- ber of mucus-secreting glands, with changes in the nea, coughing and wheezing, it is difficult to mucosa itself, and with the accumulation of mucus determine whether the symptoms are ascribable to and cellular elements in the already narrowed bronchial disease or to cardiac insufficiency. In lumen. In the patient with respiratory distress of considering the problem, it is well first to establish cardiac origin, a more elaborate succession of events what is meant by the terms bronchial asthma and has been described,1' 2 following upon the primary "cardiac asthma." failure of the left ventricle. In it are concerned de- Swineford and Magruger8 adopted the purist's creased serum protein, changes in plasma volume, point of view, that asthma develops only in persons and an increase in blood volume in the pulmonary with allergic sensitivity and heart failure. Miller,3 circuit. After the patient has been recumbent for on the other hand, distinguished between bronchial several hours, the factors leading up to pulmonary asthma due to cardiac disturbance and bronchial edema manifest themselves as the characteristic asthma due to other causes. The purposes of distinc- symptoms. In many 'instances, after a period of tion would appear to be best served by discarding time, the patient also has well-established changes the term "bronchial" and using the term "asthma," in the bronchioles, especially in the submucosa, and in accord with standard nomenclature, as mean- the accumulation of inspirated mucus in the some- ing the disorder in the bronchioles usually associ- what narrowed lumen causes the perplexing wheeze. ated with the phenomena of allergy. And the cardiac The determination of which mechanism is pri- disorder which so often causes symptoms much like marily responsible in the development of dyspnea those of asthma is paroxysmal left ventricular fail- and wheezing is extremely important with regard ure, most frequently due to hypertensive or arterio- to prognosis and treatment. One great cause of diffi- sclerotic cardiovascular disease, with varying de- culty in differential diagnosis is the attempt to gree of impaired coronary blood flow. attribute symptoms to either one mechanism or the The typical attack of dyspnea of cardiac origin other. Often, in preplexing cases, the patient has occurs at one or two o'clock in the morning, awak- both primary bronchial and cardiac disease. Riley6 ening the patient after two to four hours of sound aptly stated that when symptoms of both pulmonary sleep. Shortness of breath and wheezing, and a and cardiac origin coexist, as frequently happens sense of a weight on the chest, cause the patient to in the older age group, the clinical evaluation of sit up in bed. Often the attack is relieved in a few each with respect to its contribution to the dyspnea minutes by the coughing up of tenacious mucus, and wheezing may be extremely difficult, if not and the patient then returns to sleep for the re- impossible. mainder of the night. More severe attacks of dysp- Short clinical reports on the cases of two elderly Presented before the Section on Allergy at the 80th An- patients with dyspnea, coughing and wheezing will nual Session of the California Medical Association, Los Angeles, May 13-16, 1951. illustrate the point. 200 CALIFORNIA MEDICINE Vol. 75, No. 3 CASE REPORTS CASE 1: A 70-year-old mortician was first observed in June 1947 with complaint of coughing, wheezing and dyspnea, chiefly at night, and particularly persistent in the previous three months. The patient had had perennial asthma at age 19, while living in Ohio. The attacks diminished in frequency and severity after he moved to the Pacific Northwest. Upon examination it was noted that the lung fields were clear and there was no peripheral edema. The blood pressure was at all times within normal limits. In fluoroscopic exami- nation, cardiac enlargement of aortic configuration was ob- served, with flattened diaphragms and evidence of some pul- monary fibrosis and emphysema. Seventeen per cent of the leukocytes in the sputum were eosinophils. In preliminary testing with common inhalants there was significant reaction to feathers and to house dust. An electrocardiographic trac- ing was definitely abnormal, with evidence of bundle branch block the principal feature (Figure 1). Clinical symptoms, however, suggested asthma due probably to both inhalant and infectious factors. Symptomatic treatment with iodides and aminophylline was given and further allergic sensitivity studies were begun. However, the respiratory distress became more pronounced and more continuous. The pulse rate at rest remained at 96, and the clinical symptoms became more ap- parently those of failing left ventricle. Appropriate therapy was instituted, including bed rest, low sodium intake and digitalization. Within three days the patient became asympto- matic. There was moderate diuresis with loss of eight pounds or more in body weight. As the patient then was able to resume greater activity, allergic sensitivity studies were com- pleted and treatment with autogenous vaccine and the ubiqui- tous inhalants was started. A maintenance dose of 0.1 gm. of digitalis leaf daily was given, and after several months, the previous conduction defect was absent from electrocardio- graphic tracings (Figure 1). In the ensuing three and one- Figure 1.-Left: Electrocardiogram (Case 1) taken July 2, 1947. Center: Electrocardiogram of same patient, April half years the patient worked daily at his profession. In that 22, 1948. Right: Electrocardiogram (Case 2) taken May 13, period of time he was observed twice in what appeared to be 1948. typical asthmatic attacks following a respiratory tract infec- tion. Each attack responded within 24 hours to iodide given was admonished to discontinue the use of sympathomimetic orally and one intravenous injection of aminophylline. drugs, especially by inhalation. CASE 2: An 84-year-old widow was referred, with a diag- Despite conscientious cooperation, there was no improve- nosis of asthma, by an internist. As the patient was obviously ment, and attacks continued to occur nightly. Reevaluation of senile, there was ground for suspicion that advanced degen- the probable cause of wheezing and dyspnea was indicated. erative changes in the cardiovascular system were responsible Since the digitoxin caused no reduction in pulse rate, or for the respiratory distress. The patient had had attacks of diuresis, or symptomatic improvement, the drug was discon- coughing, wheezing and dyspnea over a period of 24 years. tinued. A regimen with potassium iodide, small doses of The attacks occurred at irregular intervals, without appar- ephedrine and an occasional subcutaneous injection of epi- ent relation to season or conunon allergens, and sometimes nephrine was started. The patient then improved slowly. were so severe as to cause transient loss of consciousness. When last observed, after a year on this regimen, the patient The patient recalled having had seasonal hay fever many had had mild respiratory distress only occasionally after res- years ago, while living in the Puget Sound area, and symp- piratory tract infection. She was taking one or two half- toms of chronic perennial rhinitis with recurring nasal tablets of Tedral® a day, and an injection of 0.2 cc. of epi- polyps. Bacterial vaccine therapy and change of climate had nephrine once or twice a month. The chief night distress was given no relief. Epinephrine, by injection, was no longer moderate nasal obstruction which was controlled by use of effective; and inhalation of 1 per cent epinephrine solution, an antihistaminic drug. once effective, was becoming less so. The original diagnoses of the primary cause of On physical examination, moderate tachycardia and evi- the respiratory distress in these two cases were far dence of moderate emphysema were noted. The blood pres- from correct. In the first case, the preponderance sure was 130 mm.
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